Persistence of desertified ecosystems: explanations and implications. Whitford, W. G., Martinez-Turanzas, G., & Martinez-Meza, E. Environmental Monitoring and Assessment, 37:319–332, 1995. abstract bibtex Studies of rainfall partitioning by shrubs, responses of shrub-dominated ecosystems to herbicide treatment, and experiments using drought and supplemental rainfall were conducted to test the hypothesis that the shrub-dominated ecosystems that have replaced grasslands are resistant and resilient to disturbance.... Drought and rainfall augmentation experiments during the growing season after 5 consecutive years of summer drought found that (1) growth of creosotebushes, Larrea tridentata, was not significantly affected, (2) perennial grasses and forbs disappeared on droughted plots, (3) nitrogen mineralization increased in the short term, and (4) densities and biomass of spring annual plants increased on the droughted plots. Doubling summer rainfall for 5 consecutive years had less-significant effects. Coppice dunes treated with herbicide in 1979 to kill mesquite (Prosopis glandulosa) had the same frequency of occurrence of the shrub as the untreated dunes when remeasured in 1993. These data indicate that the shrub-dominated ecosystems persist because they are resistant and resilient to climatic and anthropogenic stresses.
@article{whitford_persistence_1995,
title = {Persistence of desertified ecosystems: explanations and implications.},
volume = {37},
abstract = {Studies of rainfall partitioning by shrubs, responses of shrub-dominated ecosystems to herbicide treatment, and experiments using drought and supplemental rainfall were conducted to test the hypothesis that the shrub-dominated ecosystems that have replaced grasslands are resistant and resilient to disturbance.... Drought and rainfall augmentation experiments during the growing season after 5 consecutive years of summer drought found that (1) growth of creosotebushes, Larrea tridentata, was not significantly affected, (2) perennial grasses and forbs disappeared on droughted plots, (3) nitrogen mineralization increased in the short term, and (4) densities and biomass of spring annual plants increased on the droughted plots. Doubling summer rainfall for 5 consecutive years had less-significant effects. Coppice dunes treated with herbicide in 1979 to kill mesquite (Prosopis glandulosa) had the same frequency of occurrence of the shrub as the untreated dunes when remeasured in 1993. These data indicate that the shrub-dominated ecosystems persist because they are resistant and resilient to climatic and anthropogenic stresses.},
journal = {Environmental Monitoring and Assessment},
author = {Whitford, W. G. and Martinez-Turanzas, G. and Martinez-Meza, E.},
year = {1995},
keywords = {LTER-JRN, Larrea, Prosopis, annual plant, annual plants, article, decomposition, drought, journal, nitrogen mineralization, shrub ecosystem, soil, vegetation},
pages = {319--332}
}
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