Woody plant proliferation in North American drylands: A synthesis of impacts on ecosystem carbon balance

Journal of Geophysical Research: Biogeosciences

Volumn 116, Issue 3, 2011, Pages

  Barger, Nichole N ^a   Archer, Steven R ^b   Campbell, John L ^c   Huang, Cho Ying ^d   Morton, Jeffery A ^a   Knapp, Alan K ^e  

^a UNIVERSITY OF COLORADO   (United States)

^b UNIVERSITY OF ARIZONA   (United States)

^c OREGON STATE UNIVERSITY   (United States)

^d NATIONAL TAIWAN UNIVERSITY   (Taiwan)

^e Department of Environmental and Radiological Health Sciences   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ANTHROPOGENIC EFFECT; CARBON BALANCE; CARBON BUDGET; ECOREGION; ENVIRONMENTAL DISTURBANCE; HUMID ENVIRONMENT; LAND MANAGEMENT; NET PRIMARY PRODUCTION; SEMIARID REGION; SOIL CARBON; SOIL ORGANIC MATTER; VEGETATION HISTORY; WILDFIRE;

NORTH AMERICA;

EID: 84860390227     PISSN: 01480227     EISSN: None     Source Type: Journal    
DOI: 10.1029/2010JG001506     Document Type: Review

References (135)

1. Amiro, B. D., et al. (2010), Ecosystem carbon dioxide fluxes after disturbance in forests of North America, J. Geophys. Res., 115, G00K02, doi:10.1029/2010JG001390.
2. Anderson, M. D., and W. L. Baker (2006), Reconstructing landscape-scale tree invasion using survey notes in the Medicine Bow Mountains, Wyoming, USA, Landscape Ecol., 21, 243-258, doi:10.1007/s10980- 005-1938-3. (Pubitemid 43351683)
3. Ansley, R. J., and M. J. Castellano (2006), Strategies for savanna restoration in the southern Great Plains: Effects of fire and herbicides, Restor. Ecol., 14(3), 420-428, doi:10.1111/j.1526-100X.2006.00150.x.
4. Ansley, R. J., X. B. Wu, and B. A. Kramp (2001), Observation: Long-term increases in mesquite canopy cover in a north Texas savanna, J. Range Manage., 54(2), 171-176, doi:10.2307/4003179. (Pubitemid 32333307)
5. Ansley, R. J., T. W. Boutton, and J. O. Skjemstad (2006), Soil organic carbon and black carbon storage and dynamics under different fire regimes in temperate mixed-grass savanna, Global Biogeochem. Cycles, 20, GB3006, doi:10.1029/2005GB002670. (Pubitemid 46761025)
6. Archer, S. (1989), Have southern Texas savannas been converted to woodlands in recent history?, Am. Nat., 134, 545-561, doi:10.1086/284996. (Pubitemid 20424238)
7. Archer, S. (1994), Woody plant encroachment into southwestern grasslands and savannas: Rates, patterns, and proximate causes, in Ecological Implications of Livestock Herbivory in the West, edited by M. Vavra et al., pp. 13-68, Soc. for Range Manage., Denver, Colo.
8. Archer, S., C. Scifres, C. R. Bassham, and R. Maggio (1988), Autogenic succession in a subtropical savanna: Conversion of grassland to thorn woodland, Ecol. Monogr., 58(2), 111-127, doi:10.2307/1942463. (Pubitemid 19319715)
9. Archer, S., D. S. Schimel, and E. A. Holland (1995), Mechanisms of shrubland expansion: Land use, climate or CO2?, Clim. Change, 29(1), 91-99, doi:10.1007/BF01091640.
10. Archer, S., T. W. Boutton, and K. A. Hibbard (2001), Trees in grasslands: Biogeochemical consequences of woody plant expansion, in Global Biogeochemical Cycles in the Climate System, edited by E. D. Schulze et al., pp. 115-138, Academic, San Diego, Calif., doi:10.1016/B978- 012631260-7/50011-X.
11. Ash, A. J., J. G. McIvor, J. J. Mott, and M. H. Andrew (1997), Building grass castles: Integrating ecology and management of Australia's tropical tallgrass rangelands, Rangeland J., 19(2), 123-144, doi:10.1071/ RJ9970123.
12. Asner, G., and S. Archer (2010), Livestock and the global carbon cycle, in Livestock in a Changing Landscape: Drivers Consequences and Responses, edited by H. Steinfeld et al., Island Press, Washington, D. C.
13. Asner, G. P., and R. E. Martin (2004), Biogeochemistry of desertification and woody encroachment in grazing systems, in Ecosystems and Land Use Change, edited by R. Defries et al., pp. 99-116, AGU, Washington, D. C.
14. Asner, G. P., S. Archer, R. F. Hughes, R. J. Ansley, and C. A. Wessman (2003), Net changes in regional woody vegetation cover and carbon storage in Texas drylands, 1937-1999, Global Change Biol., 9(3), 316-335, doi:10.1046/j.1365-2486.2003.00594.x. (Pubitemid 36386550)
15. Asner, G. P., A. J. Elmore, L. P. Olander, R. E. Martin, and A. T. Harris (2004), Grazing systems, ecosystem responses, and global change, Annu. Rev. Environ. Resour., 29, 261-299, doi:10.1146/annurev.energy.29.062403.102142
16. Bai, Y., K. Broersma, D. Thompson, and T. J. Ross (2004), Landscapelevel dynamics of grassland-forest transitions in British Columbia, J. Range Manage., 57(1), 66-75, doi:10.2307/4003956. (Pubitemid 41150794)
17. Bai, Y., T. Colberg, J. T. Romo, B. McConkey, D. Pennock, and R. Farrell (2009), Does expansion of western snowberry enhance ecosystem carbon sequestration and storage in Canadian Prairies?, Agric. Ecosyst. Environ., 134(3-4), 269-276, doi:10.1016/j.agee.2009.07.009.
18. Bailey, R., P. Avers, T. King, and W. McNab (1994), Ecoregions and subregions of the United States (map), For. Serv., U.S. Dep. of Agric., Washington, D. C.
19. Barger, N. N., H. D. Adams, C. Woodhouse, J. C. Neff, and G. P. Asner (2009), Influence of livestock grazing and climate on pinyon pine (Pinus edulis) dynamics, Rangeland Ecol. Manag., 62(6), 531-539, doi:10.2111/.1/REM-D-09- 00029.1.
20. Bates, J. D., T. J. Svejcar, and R. F. Miller (2002), Effects of juniper cutting on nitrogen mineralization, J. Arid Environ., 51(2), 221-234, doi:10.1006/jare.2001.0948.
21. Biederman, L. A., and T. W. Boutton (2009), Biodiversity and trophic structure of soil nematode communities are altered following woody plant invasion of grassland, Soil Biol. Biochem., 41(9), 1943-1950, doi:10.1016/j.soilbio.2009.06.019.
22. Blackburn, W. H., and P. T. Tueller (1970), Pinyon and juniper invasion in black sagebrush communities in east-central Nevada, Ecology, 51(5), 841-848, doi:10.2307/1933976.
23. Boutton, T. W., S. R. Archer, A. J. Midwood, S. F. Zitzer, and R. Bol (1998), Delta C-13 values of soil organic carbon and their use in documenting vegetation change in a subtropical savanna ecosystem, Geoderma, 82(1-3), 5-41, doi:10.1016/S0016-7061(97)00095-5. (Pubitemid 28180969)
24. Boutton, T. W., J. D. Liao, T. R. Filley, and S. R. Archer (2008), Belowground carbon storage and dynamics following woody plant encroachment in a subtropical savanna, in Soil Carbon Sequestration and the Greenhouse Effect, edited by R. Lal and R. Follett, pp. 181-205, Soil Sci. Soc. of Am., Madison, Wis.
25. Bovey, R. W. (2001), Woody Plants and Woody Plant Management: Ecology, Safety, and Environmental Impact, Marcel Dekker, New York.
26. Bowers, J. E. (2005), Effects of drought on shrub survival and longevity in the northern Sonoran Desert, J. Torrey Bot. Soc., 132(3), 421-431, doi:10.3159/1095-5674(2005)132[421:EODOSS]2.0.CO;2. (Pubitemid 41820310)
27. Bowman, D. M. J. S., et al. (2009), Fire in the Earth system, Science, 324(5926), 481-484, doi:10.1126/science.1163886.
28. Bradley, B. A., R. A. Houghton, J. F. Mustard, and S. P. Hamburg (2006), Invasive grass reduces aboveground carbon stocks in shrublands of the western US, Global Change Biol., 12(10), 1815-1822, doi:10.1111/ j.1365-2486.2006.01232. x. (Pubitemid 44383508)
29. Bragg, T. B., and L. C. Hulbert (1976), Woody plant invasion of unburned Kansas bluestem prairie, J. Range Manage., 29(1), 19-24, doi:10.2307/ 3897682.
30. Briggs, J. M., G. A. Hoch, and L. C. Johnson (2002), Assessing the rate, mechanisms, and consequences of the conversion of tallgrass prairie to Juniperus virginiana forest, Ecosystems, 5(6), 578-586, doi:10.1007/ s10021-002-0187-4. (Pubitemid 35465006)
31. Briggs, J. M., A. K. Knapp, J. M. Blair, J. L. Heisler, G. A. Hoch, M. S. Lett, and J. K. McCarron (2005), An ecosystem in transition: Causes and consequences of the conversion of mesic grassland to shrubland, BioScience, 55(3), 243-254, doi:10.1641/0006-3568(2005)055[0243:AEITCA]2.0.CO;2 (Pubitemid 40383774)
32. Briggs, J. M., H. Schaafsma, and D. Trenkov (2007), Woody vegetation expansion in a desert grassland: Prehistoric human impact?, J. Arid Environ., 69(3), 458-472, doi:10.1016/j.jaridenv.2006.10.012. (Pubitemid 46186502)
33. Browning, D. M., and S. R. Archer (2011), Protection from livestock grazing fails to deter shrub proliferation in a desert landscape with a history of heavy grazing, Ecol. Appl., 21, 1629-1642, doi:10.1890/10-0542.1.
34. Browning, D. M., S. R. Archer, G. P. Asner, M. P. McClaran, and C. A. Wessman (2008), Woody plants in grasslands: Post-encroachment stand dynamics, Ecol. Appl., 18(4), 928-944, doi:10.1890/07-1559.1.
35. Browning, D. M., S. R. Archer, and A. T. Byrne (2009), Field validation of 1930s aerial photography: What are we missing?, J. Arid Environ., 73(9), 844-853, doi:10.1016/j.jaridenv.2009.04.003.
36. Buffington, L. C., and C. H. Herbel (1965), Vegetational changes on a semidesert grassland range from 1858 to 1963, Ecol. Monogr., 35(2), 139-164, doi:10.2307/1948415.
37. Canadell, J., R. B. Jackson, J. B. Ehleringer, H. A. Mooney, O. E. Sala, and E. D. Schulze (1996), Maximum rooting depth of vegetation types at the global scale, Oecologia, 108(4), 583-595, doi:10.1007/BF00329030.
38. Carter, M. G. (1964), Effects of drought on mesquite, J. Range Manage., 17, 275-276, doi:10.2307/3895453.
39. Conant, R. T., and K. Paustian (2002), Potential soil carbon sequestration in overgrazed grassland ecosystems, Global Biogeochem. Cycles, 16(4), 1143, doi:10.1029/2001GB001661.
40. Connin, S. L., R. A. Virginia, and C. P. Chamberlain (1997), Carbon isotopes reveal soil organic matter dynamics following arid land shrub expansion, Oecologia, 110(3), 374-386, doi:10.1007/s004420050172. (Pubitemid 27191303)
41. Coop, J. D., and T. J. Givnish (2007), Spatial and temporal patterns of recent forest encroachment in montane grasslands of the Valles Caldera, New Mexico, USA, J. Biogeogr., 34(5), 914-927, doi:10.1111/j.1365- 2699.2006.01660.x. (Pubitemid 46624127)
42. Dai, X., T. W. Boutton, B. Glaser, R. J. Ansley, and W. Zech (2005), Black carbon in a temperate mixed-grass savanna, Soil Biol. Biochem., 37(10), 1879-1881, doi:10.1016/j.soilbio.2005.02.021. (Pubitemid 40837258)
43. Derner, J. D., T. W. Boutton, and D. D. Briske (2006), Grazing and ecosystem carbon storage in the North American Great Plains, Plant Soil, 280, 77-90, doi:10.1007/s11104-005-2554-3.
44. Fensham, R. J., R. J. Fairfax, and S. Archer (2005), Rainfall, land use and woody vegetation cover change in semi-arid Australian savanna, J. Ecol., 93(3), 596-606, doi:10.1111/j.1365-2745.2005.00998.x. (Pubitemid 40801926)
45. Foster, D., F. Swanson, J. Aber, I. Burke, N. Brokaw, D. Tilman, and A. Knapp (2003), The importance of land-use legacies to ecology and conservation, BioScience, 53(1), 77-88, doi:10.1641/0006-3568(2003) 053[0077:TIOLUL]2.0.CO;2. (Pubitemid 36093436)
46. Franklin, K. A., K. Lyons, P. L. Nagler, D. Lampkin, E. P. Glenn, F. Molina- Freaner, T. Markow, and A. R. Huete (2006), Buffelgrass (Pennisetum ciliare) land conversion and productivity in the plains of Sonora, Mexico, Biol. Conserv., 127(1), 62-71, doi:10.1016/j.biocon.2005.07.018. (Pubitemid 41560941)
47. Franzluebbers, A. J., and M. A. Arshad (1996), Water-stable aggregation and organic matter in four soils under conventional and zero tillage, Can. J. Soil Sci., 76(3), 387-393, doi:10.4141/cjss96-046. (Pubitemid 27141339)
48. Franzluebbers, A. J., and M. A. Arshad (1997), Particulate organic carbon content and potential mineralization as affected by tillage and texture, Soil Sci. Soc. Am. J., 61(5), 1382-1386, doi:10.2136/sssaj1997. 03615995006100050014x.
49. Fredrickson, E. L., R. E. Estell, A. Laliberte, and D. M. Anderson (2006), Mesquite recruitment in the Chihuahuan Desert: Historic and prehistoric patterns with long-term impacts, J. Arid Environ., 65(2), 285-295, doi:10.1016/j.jaridenv.2005.10.019. (Pubitemid 43143406)
50. Geesing, D., P. Felker, and R. L. Bingham (2000), Influence of mesquite (Prosopis glandulosa) on soil nitrogen and carbon development: Implications for global carbon sequestration, J. Arid Environ., 46(2), 157-180, doi:10.1006/jare.2000.0661.
51. Gill, R. A., and I. C. Burke (1999), Ecosystem consequences of plant life form changes at three sites in the semiarid United States, Oecologia, 121(4), 551-563, doi:10.1007/s004420050962. (Pubitemid 30031126)
52. Gillette, D. A., and A. M. Pitchford (2004), Sand flux in the northern Chihuahuan Desert, New Mexico, USA, and the influence of mesquite-dominated landscapes, J. Geophys. Res., 109, F04003, doi:10.1029/2003JF000031.
53. Goslee, S. C., K. M. Havstad, D. P. C. Peters, A. Rango, and W. H. Schlesinger (2003), High-resolution images reveal rate and pattern of shrub encroachment over six decades in New Mexico, U.S, J. Arid Environ., 54(4), 755-767, doi:10.1006/jare.2002.1103. (Pubitemid 36708555)
54. Hallinger, M., M. Manthey, and M. Wilmking (2010), Establishing a missing link: Warm summers and winter snow cover promote shrub expansion into alpine tundra in Scandinavia, New Phytol., 186(4), 890-899, doi:10.1111/ j.1469-8137.2010.03223.x.
55. Hibbard, K. A., S. Archer, D. S. Schimel, and D. W. Valentine (2001), Biogeochemical changes accompanying woody plant encroachment in a subtropical savanna, Ecology, 82(7), 1999-2011, doi:10.1890/0012- 9658(2001)082[1999:BCAWPE] 2.0.CO;2. (Pubitemid 32673798)
56. Hibbard, K. A., D. S. Schimel, S. Archer, D. S. Ojima, and W. Parton (2003), Grassland to woodland transitions: Integrating changes in landscape structure and biogeochemistry, Ecol. Appl., 13(4), 911-926, doi:10.1890/1051- 0761(2003)13[911:GTWTIC]2.0.CO;2. (Pubitemid 37546296)
57. Hicke, J. A., R. L. Sherriff, T. T. Veblen, and G. P. Asner (2004), Carbon accumulation in Colorado ponderosa pine stands, Can. J. For. Res., 34(6), 1283-1295, doi:10.1139/x04-011. (Pubitemid 39224982)
58. Hoch, G. A., J. M. Briggs, and L. C. Johnson (2002), Assessing the rate, mechanisms, and consequences of the conversion of tallgrass prairie to Juniperus virginiana forest, Ecosystems, 5(7), 578, doi:10.1007/ s10021-002-0187-4.
59. Holchek, J., R. Pieper, and C. Herbel (2003), Range Management: Principles and Practices, Prentice Hall, London.
60. Houghton, R. A. (2003), Revised estimates of the annual net flux of carbon to the atmosphere from changes in land use and land management 1850-2000, Tellus, Ser. B, 55(2), 378-390, doi:10.1034/j.1600- 0889.2003.01450.x. (Pubitemid 36610979)
61. Houghton, R. A., J. L. Hackler, and K. T. Lawrence (1999), The U.S. carbon budget: Contributions from land-use change, Science, 285(5427), 574-578, doi:10.1126/science.285.5427.574. (Pubitemid 29352926)
62. Huang, C. Y., S. E. Marsh, M. P. McClaran, and S. Archer (2007), Post-fire stand structure in a semi-arid savanna: Cross-scale challenges estimating biomass, Ecol. Appl., 17(7), 1899-1910, doi:10.1890/06-1968.1. (Pubitemid 351328163)
63. Huang, C., G. Asner, N. Barger, J. Neff, and L. Floyd-Hanna (2010), Regional carbon losses due to drought-induced tree dieback in piñonjuniper ecosystems, Remote Sens. Environ., 114, 1471-1479, doi:10.1016/j.rse.2010.02. 003.
64. Huenneke, L. F., J. P. Anderson, M. Remmenga, and W. H. Schlesinger (2002), Desertification alters patterns of aboveground net primary production in Chihuahuan ecosystems, Global Change Biol., 8(3), 247-264, doi:10.1046/j.1365- 2486.2002.00473.x. (Pubitemid 34409575)
65. Hughes, R. F., S. R. Archer, G. P. Asner, C. A. Wessman, C. McMurtry, J. Nelson, and R. J. Ansley (2006), Changes in aboveground primary production and carbon and nitrogen pools accompanying woody plant encroachment in a temperate savanna, Global Change Biol., 12(9), 1733-1747, doi:10.1111/j.1365-2486.2006. 01210.x. (Pubitemid 44270150)
66. Hurtt, G. C., S. W. Pacala, P. R. Moorcroft, J. Caspersen, E. Shevliakova, R. A. Houghton, and B. Moore (2002), Projecting the future of the U.S. carbon sink, Proc. Natl. Acad. Sci. U. S. A., 99(3), 1389-1394, doi:10.1073/pnas.012249999. (Pubitemid 34139794)
67. Jackson, R. B., J. Canadell, J. R. Ehleringer, H. A. Mooney, O. E. Sala, and E. D. Schulze (1996), A global analysis of root distributions for terrestrial biomes, Oecologia, 108(3), 389-411, doi:10.1007/BF00333714.
68. Jackson, R. B., et al. (2000), Belowground consequences of vegetation change and their treatment in models, Ecol. Appl., 10(2), 470-483, doi:10.1890/1051-0761(2000)010[0470:BCOVCA]2.0.CO;2.
69. Jackson, R. B., J. L. Banner, E. G. Jobbagy, W. T. Pockman, and D. H. Wall (2002), Ecosystem carbon loss with woody plant invasion of grasslands, Nature, 418(6898), 623-626, doi:10.1038/nature00910.
70. King, A. W., L. Dilling, G. P. Zimmerman, D. M. Fairman, R. A. Houghton, G. Marland, A. Z. Rose, and T. J. Wilbanks (2007), Executive summary, in The First State of the Carbon Cycle Report (SOCCR): The North American Carbon Budget and Implications for the Global Carbon Cycle, A Report by the U.S. Climate Change Science Program and the Subcommittee on Global Change Research, pp. 1-14, Natl. Climatic Data Cent., Natl. Oceanic and Atmos. Admin., Asheville, N. C.
71. King, D. M., S. M. Skirvin, C. Holifield, D. C. Moran, S. M. Biedenbender, H. S. Kidwell, R. M. Weltz, and G. A. Diaz (2008), Assessing Vegetation Change Temporally and Spatially in Southeastern Arizona, AGU, Washington, D. C.
72. Klemmedson, J. O., and A. R. Tiedemann (1986), Long-term effects of mesquite removal on soil characteristics: II. Nutrient availability, Soil Sci Soc. Am. J. , 50(2), 476-480, doi:10.2136/sssaj1986.03615995005000020045x.
73. Klemmedson, J. O., and A. R. Tiedemann (2000), Influence of western juniper development on distribution of soil and organic layer nutrients, Northwest Sci., 74(1), 1-11. (Pubitemid 30199513)
74. Knapp, A. K., et al. (2008), Shrub encroachment in North American grasslands: Shifts in growth form dominance rapidly alters control of ecosystem carbon inputs, Global Change Biol., 14(3), 615-623, doi:10.1111/ j.1365-2486.2007.01512.x. (Pubitemid 351228531)
75. Kupfer, J. A., and J. D. Miller (2005), Wildfire effects and post-fire responses of an invasive mesquite population: The interactive importance of grazing and non-native herbaceous species invasion, J. Biogeogr., 32(3), 453-466, doi:10.1111/j.1365-2699.2004.01217.x. (Pubitemid 40428261)
76. Laliberte, A. S., A. Rango, K. M. Havstad, J. F. Paris, R. F. Beck, R. McNeely, and A. L. Gonzalez (2004), Object-oriented image analysis for mapping shrub encroachment from 1937 to 2003 in southern New Mexico, Remote Sens. Environ., 93(1-2), 198-210, doi:10.1016/j. rse.2004.07.011. (Pubitemid 39234720)
77. Lane, D. R., D. P. Coffin, and W. K. Lauenroth (1998), Effects of soil texture and precipitation on above-ground net primary productivity and vegetation structure across the Central Grassland region of the United States, J. Veg. Sci., 9(2), 239-250, doi:10.2307/3237123. (Pubitemid 28259704)
78. Lett, M. S., A. K. Knapp, J. M. Briggs, and J. M. Blair (2004), Influence of shrub encroachment on aboveground net primary productivity and carbon and nitrogen pools in a mesic grassland, Can. J. Bot., 82(9), 1363-1370, doi:10.1139/b04-088. (Pubitemid 39554214)
79. Liao, J. D., T. W. Boutton, and J. D. Jastrow (2006), Storage and dynamics of carbon and nitrogen in soil physical fractions following woody plant invasion of grassland, Soil Biol. Biochem., 38(11), 3184-3196, doi:10.1016/j.soilbio.2006.04.003. (Pubitemid 44427868)
80. Liu, F., X. Wu, E. Bai, T. W. Boutton, and S. R. Archer (2010), Spatial scaling of ecosystem C and N in a subtropical savanna landscape, Global Change Biol., 16(8), 2213-2223, doi:10.1111/j.1365-2486.2009.02099.x.
81. Liu, F., X. B. Wu, E. Bai, T. Boutton, and S. Archer (2011), Quantifying soil organic carbon in complex landscapes: An example of grassland undergoing encroachment of woody plants, Global Change Biol., 17(2), 1119-1129, doi:10.1111/j.1365-2486.2010.02251.x.
82. Mast, J. N., T. T. Veblen, and M. E. Hodgson (1997), Tree invasion within a pine/grassland ecotone: An approach with historic aerial photography and GIS modeling, For. Ecol. Manage., 93(3), 181-194, doi:10.1016/ S0378-1127(96)03954- 0.
83. McAuliffe, J. R. (1994), Landscape evolution, soil formation, and ecological patterns and processes in Sonoran Desert Bajadas, Ecol. Monogr., 64(2), 112-148, doi:10.2307/2937038.
84. McAuliffe, J. R., L. A. Scuderi, and L. D. McFadden (2006), Tree-ring record of hillslope erosion and valley floor dynamics: Landscape responses to climate variation during the last 400 yr in the Colorado Plateau, northeastern Arizona, Global Planet. Change, 50, 184-201, doi:10.1016/j.gloplacha.2005.12. 003. (Pubitemid 43673890)
85. McClaran, M. P. (2003), A century of vegetation change in the Santa Rita Experimental Range, in Santa Rita Experimental Range: 100 Years (1903-2003) of Accomplishments and Contributions, Rocky Mt. Res. Stn., U.S. Dep. of Agric., Fort Collins, Colo.
86. McClaran, M. P., J. Moore-Kucera, D. A. Martens, J. van Haren, and S. E. Marsh (2008), Soil carbon and nitrogen in relation to shrub size and death in a semi-arid grassland, Geoderma, 145(1-2), 60-68, doi:10.1016/j.geoderma.2008.02. 006.
87. McCulley, R. L., S. R. Archer, T. W. Boutton, F. M. Hons, and D. A. Zuberer (2004), Soil respiration and nutrient cycling in wooded communities developing in grassland, Ecology, 85(10), 2804-2817, doi:10.1890/03- 0645. (Pubitemid 39448255)
88. McKinley, D., and J. Blair (2008), Woody plant encroachment by Juniperus virginiana in a mesic native grassland promotes rapid carbon and nitrogen accrual, Ecosystems, 11(3), 454-468, doi:10.1007/s10021-008-9133-4.
89. Milchunas, D. G., and W. K. Lauenroth (1993), Quantitative effects of grazing on vegetation and soils over a global range of environments, Ecol. Monogr., 63(4), 327-366, doi:10.2307/2937150.
90. Miller, M. E. (1999), Use of historic aerial photography to study vegetation change in the Negrito Creek watershed, southwestern New Mexico, Southwest. Nat., 44(2), 121-137. (Pubitemid 29308065)
91. Miller, R. F., and J. R. Rose (1995), Historic expansion of Juniperus occidentalis (western juniper) in southeast Oregon, Great Basin Nat., 55(1), 37-45.
92. Miller, R. F., and P. E. Wigand (1994), Holocene changes in semiarid pinyon-juniper woodlands, BioScience, 44(7), 465-474, doi:10.2307/ 1312298.
93. Mun, H. T., and W. G. Whitford (1997), Changes in mass and chemistry of plant roots during long-term decomposition on a Chihuahuan Desert watershed, Biol. Fertil. Soils, 26(1), 16-22, doi:10.1007/s003740050336. (Pubitemid 28094272)
94. Neff, J. C., N. N. Barger, W. T. Baisden, D. P. Fernandez, and G. P. Asner (2009), Soil carbon storage responses to expanding pinyon-juniper populations in southern Utah, Ecol. Appl., 19(6), 1405-1416, doi:10.1890/08- 0784.1.
95. Neilson, R. P., G. A. King, and G. Koerper (1992), Toward a rule-based biome model, Landscape Ecol., 7(1), 27-43, doi:10.1007/BF02573955.
96. Norris, M. D., J. M. Blair, L. C. Johnson, and R. B. McKane (2001), Assessing changes in biomass, productivity, and C and N stores following Juniperus virginiana forest expansion into tallgrass prairie, Can. J. For. Res., 31(11), 1940-1946, doi:10.1139/cjfr-31-11-1940. (Pubitemid 34004252)
97. Okin, G. S., P. D'Odorico, and S. R. Archer (2009), Impact of feedbacks on Chihuahuan desert grasslands: Transience and metastability, J. Geophys. Res., 114, G01004, doi:10.1029/2008JG000833.
98. Pacala, S., et al. (2007), The North American carbon budget past and present, in The First State of the Carbon Cycle Report (SOCCR): The North American Carbon Budget and Implications for the Global Carbon Cycle, A Report by the U.S. Climate Change Science Program and the Subcommittee on Global Change Research, pp. 29-36, Natl. Climatic Data Cent., Natl. Oceanic and Atmos. Admin., Asheville, N. C.
99. Peters, D. P. C., B. T. Bestelmeyer, J. E. Herrick, E. L. Fredrickson, H. C. Monger, and K. M. Havstad (2006), Disentangling complex landscapes: New insights into arid and semiarid system dynamics, BioScience, 56(6), 491-501, doi:10.1641/0006-3568(2006)56[491:DCLNII]2.0.CO;2. (Pubitemid 43830945)
100. Reeder, J. D., and G. E. Schuman (2002), Influence of livestock grazing on C sequestration in semi-arid mixed-grass and short-grass rangelands, Environ. Pollut., 116(3), 457-463, doi:10.1016/S0269-7491(01)00223-8. (Pubitemid 33095093)
101. Robertson, K. R., M. W. Schwartz, J. W. Olson, B. K. Dunphy, and H. D. Clarke (1996), 50 years of change in Illinois hill prairies, Erigenia, J. Ill. Native Plant Soc., 14, 41-52.
102. Sankaran, M., et al. (2005), Determinants of woody cover in African savannas, Nature, 438(7069), 846-849, doi:10.1038/nature04070. (Pubitemid 41753065)
103. Sankey, T. T., and M. J. Germino (2008), Assessment of juniper encroachment with the use of satellite imagery and geospatial data, Rangeland Ecol. Manag., 61(4), 412-418, doi:10.2111/07-141.1.
104. Scanlan, J. C., and S. Archer (1991), Simulated dynamics of succession in a North American subtropical Prosopis-savanna, J. Veg. Sci., 2(5), 625-634, doi:10.2307/3236173.
105. Scharenbroch, B. C., M. L. Flores-Mangual, B. Lepore, J. G. Bockheim, and B. Lowery (2010), Tree encroachment impacts carbon dynamics in a sand prairie in Wisconsin, Soil Sci. Soc. Am. J., 74(3), 956-968, doi:10.2136/sssaj2009.0223.
106. Schlesinger, W. H. (1997), Biogeochemistry: An Analysis of Global Change, 2nd ed., Academic, New York.
107. Schlesinger, W. H., and A. M. Pilmanis (1998), Plant-soil interactions in deserts, Biogeochemistry, 42(1-2), 169-187, doi:10.1023/ A:1005939924434. (Pubitemid 28395172)
108. Scifres, C. J. (1980), Brush Management: Principles and Practices for Texas and the Southwest, Texas A&M Univ., College Station.
109. Scott, R. L., G. D. Jenerette, D. L. Potts, and T. E. Huxman (2009), Effects of seasonal drought on net carbon dioxide exchange from a woody-plantencroached semiarid grassland, J. Geophys. Res., 114, G04004, doi:10.1029/2008JG000900.
110. Seager, R., et al. (2007), Model projections of an imminent transition to a more arid climate in southwestern North America, Science, 316(5828), 1181-1184, doi:10.1126/science.1139601. (Pubitemid 46877478)
111. Shaw, J. D., B. E. Steed, and L. T. DeBlander (2005), Forest Inventory and Analysis (FIA) annual inventory answers the question: What is happening to pinyon-juniper woodlands?, J. For., 103, 280-285. (Pubitemid 41522664)
112. Smeins, F. E., and L. B. Merrill (1988), Long-Term Change in a Semi-Arid Grassland, Baylor Univ., Waco, Tex.
113. Smith, D. L., and L. C. Johnson (2003), Expansion of Juniperus virginiana L. in the Great Plains: Changes in Soil Organic Carbon Dynamics, AGU, Washington, D. C.
114. Soulé, P. T., and P. A. Knapp (1998), Recent Juniperus occidentalis (Western Juniper) expansion on a protected site in central Oregon, Global Change Biol., 4(3), 347-357, doi:10.1046/j.1365-2486.1998.00160.x. (Pubitemid 128566669)
115. Soulé, P. T., and P. A. Knapp (1999), Western juniper expansion on adjacent disturbed and near-relict sites, J. Range Manage., 52(5), 525-533, doi:10.2307/4003782. (Pubitemid 29447274)
116. Soulé, P. T., P. A. Knapp, and H. D. Grissino-Mayer (2003), Comparative rates of western juniper afforestation in south-central Oregon and the role of anthropogenic disturbance, Prof. Geogr., 55(1), 43-55. (Pubitemid 36557906)
117. Springsteen, A., W. Loya, M. Liebig, and J. Hendrickson (2010), Soil carbon and nitrogen across a chronosequence of woody plant expansion in North Dakota, Plant Soil, 328(1), 369-379, doi:10.1007/s11104-009- 0117-8.
118. Stow, D. A., et al. (2004), Remote sensing of vegetation and land-cover change in Arctic Tundra Ecosystems, Remote Sens. Environ., 89(3), 281-308, doi:10.1016/j.rse.2003.10.018. (Pubitemid 38178903)
119. Strand, E. K., L. A. Vierling, A. M. S. Smith, and S. C. Bunting (2008), Net changes in aboveground woody carbon stock in western juniper woodlands, 1946-1998, J. Geophys. Res., 113, G01013, doi:10.1029/ 2007JG000544.
120. Tape, K., M. Sturm, and C. Racine (2006), The evidence for shrub expansion in Northern Alaska and the Pan-Arctic, Global Change Biol., 12(4), 686-702, doi:10.1111/j.1365-2486.2006.01128.x.
121. Tausch, R. J., and R. S. Nowak (1999), Fifty Years of Ecotone Change Between Shrub and Tree Dominance in the Jack Springs Pinyon Research Natural Area, pp. 1-7, Rocky Mt. Res. Stn., For. Serv., U.S. Dep. of Agric., Ephraim and Ogden, Utah.
122. Teague, W. R., J. K. Foy, B. T. Cross, and S. L. Dowhower (1999), Soil carbon and nitrogen changes following root-plowing of rangeland, J. Range Manage., 52(6), 666-670, doi:10.2307/4003639.
123. Throop, H. L., and S. R. Archer (2008), Shrub (Prosopis velutina) encroachment in a semidesert grassland: Spatial/temporal changes in soil organic carbon and nitrogen pools, Global Change Biol., 14(10), 2420-2431, doi:10.1111/j.1365-2486.2008.01650.x.
124. Tiedemann, A. R., and J. O. Klemmedson (1986), Long-term effects of mesquite removal on soil characteristics: I. Nutrients and bulk density, Soil Sci. Soc. Am. J., 50(2), 472-475, doi:10.2136/sssaj1986. 03615995005000020044x.
125. Tiedemann, A. R., and J. O. Klemmedson (1995), The influence of western juniper development on soil nutrient availability, Northwest Sci., 69, 1-8. (Pubitemid 26438991)
126. Tiedemann, A. R., and J. O. Klemmedson (2000), Biomass and nutrient distribution of system nutrient budget for western juniper in central Oregon, Northwest Sci., 74(1), 12-24. (Pubitemid 30199514)
127. Tiedemann, A. R., and J. O. Klemmedson (2004), Responses of desert grassland vegetation to mesquite removal and regrowth, J. Range Manage., 57(5), 455-465, doi:10.2307/4003974. (Pubitemid 40441200)
128. Valentine, J. F. (1989), Range Development and Improvements, 3rd ed., Academic, San Diego, Calif.
129. Van Auken, O. W. (2000), Shrub invasions of North American semiarid grasslands, Annu. Rev. Ecol. Syst., 31(1), 197-215, doi:10.1146/annurev. ecolsys.31.1.197. (Pubitemid 32122400)
130. Wainwright, J., A. J. Parsons, and A. D. Abrahams (2000), Plot-scale studies of vegetation, overland flow and erosion interactions: Case studies from Arizona and New Mexico, Hydrol. Process., 14(16-17), 2921-2943, doi:10.1002/1099-1085(200011/12)14:16/173.0. CO;2-7.
131. Walker, T. L., and W. W. Hoback (2007), Effects of invasive eastern redcedar on capture rates of Nicrophorus americanus and other Silphidae, Environ. Entomol., 36(2), 297-307, doi:10.1603/0046-225X(2007)36[297: EOIERO]2.0.CO;2. (Pubitemid 46798120)
132. Weltzin, J. E., S. R. Archer, and R. K. Heitschmidt (1998), Defoliation and woody plant (Prosopis glandulosa) seedling regeneration: Potential vs realized herbivory tolerance, Plant Ecol., 138(2), 127-135, doi:10.1023/ A:1009743130922. (Pubitemid 28490427)
133. Wessman, C. A., S. Archer, L. C. Johnson, and G. P. Asner (2004), Woodland expansion in US grasslands: Assessing land-cover change and biogeochemical impacts, in Land Change Science: Observing, Monitoring and Understanding Trajectories of Change on the Earth, edited by A. C. Janetos et al., pp. 185-208, Kluwer Acad., Dordrect, Netherlands.
134. Wheeler, C. W., S. R. Archer, G. P. Asner, and C. R. McMurtry (2007), Climatic/edaphic controls on soil carbon/nitrogen response to shrub encroachment in desert grassland, Ecol. Appl., 17(7), 1911-1928, doi:10.1890/06-1580.1. (Pubitemid 351328164)
135. Williams, D. G., and Z. Baruch (2000), African grass invasion in the Americas: Ecosystem consequences and the role of ecophysiology, Biol. Invasions, 2, 123-140, doi:10.1023/A:1010040524588. (Pubitemid 32148626)