@inbook {50937, title = {Desertification}, booktitle = {Encyclopedia of Global Change}, year = {2002}, note = {//??//LTER III//ProCite field[6]: In}, month = {2002}, pages = {253-256}, publisher = {Oxford University Press}, organization = {Oxford University Press}, address = {Oxford}, keywords = {book, books, chapter, chapters, desertification, report, reports}, author = {W. H. Schlesinger}, editor = {A.S. Goudie and Cuff, D. J. (eds.)} } @article {51186, title = {Nutrient losses in runoff from grassland and shrubland habitats in Southern New Mexico: I. rainfall simulation experiments}, journal = {Biogeochemistry}, volume = {45}, year = {1999}, note = {//NMSU,USDA//LTER III//}, month = {1999}, pages = {21-34}, abstract = {

Rainfall simulation experiments were performed in areas of semiarid grassland (Bouteloua eriopoda) and arid shrubland (Larrea tridentata) in the Chihuahuan desert of New Mexico. The objective was to compare the runoff of nitrogen (N) and phosphorus (P) from these habitats to assess whether losses of soil nutrients are associated with the invasion of grasslands by shrubs. Runoff losses from grass- and shrub-dominated plots were similar, and much less than from bare plots located in the shrubland. Weighted average concentrations of total dissolved N compounds in runoff were greatest in the grassland (1.72 mg/l) and lowest in bare plots in the shrubland (0.55 mg/l). More than half of the N transported in runoff was carried in dissolved organic compounds. In grassland and shrub plots, the total N loss was carried in dissolved organic compounds. In grassland and shrub plots, the total N loss was highly correlated to the total volume of discharge. We estimate that the total annual loss of N in runoff is 0.25 kg/ha/yr in grasslands and 0.43 kg/ha/yr in shrublands -- consistent with the depletion of soil N during desertification of these habitats. Losses of P from both habitats were very small.

}, keywords = {article, articles, desertification, grassland, hydrology, grassland, hydrology, nutrient export, hydrology, rainfall simulation, hydrology, shrubland, hydrology, surface runoff, journal, journals, nitrogen, nutrient budgets, phosphorus, runoff}, doi = {10.1023/A:1006020831706}, url = {files/bibliography/JRN00282.pdf}, author = {W. H. Schlesinger and Athol D. Abrahams and A.J. Parsons and John Wainwright} } @article {51248, title = {Plant-soil interactions in deserts}, journal = {Biogeochemistry}, volume = {42}, year = {1998}, note = {//USDA//LTER-III//}, month = {1998}, pages = {169-187}, abstract = {

Geostatistical analyses show that the distribution of soil N, P and K is strongly associated with the presence of shrubs in desert habitats. Shrubs concentrate the biogeochemical cycle of these elements in "islands of fertility" that are localized benath their canopies, while adjacent barren, intershrub spaces are comparatively devoid of biotic activity. Both physical and biological processes are involved in the formation of shrub islands. Losses of semiarid grassland in favor of invading shrubs initiate these changes in the distribution of soil nutrients, which may promote the further invasion and persistence of shrubs and cause potential feedbacks between desertification and the Earth{\textquoteright}s climate system.

}, keywords = {article, articles, biogeochemistry, calcite, biogeochemistry, calcium carbonate, biogeochemistry,desertification, biogeochemistry,nitrogen, desertification, erosion, geostatistics, journal, journals, nitogen, phosphorus, Prosopis, soil nutrients, soil heterogeneity, soil, aridisols, soil, nutrients}, doi = {10.1023/A:1005939924434 }, url = {files/bibliography/JRN00260.pdf}, author = {W. H. Schlesinger and A. M. Pilmanis} }