Impact of feedbacks on Chihuahuan desert grasslands: Transience and metastability
Impact of feedbacks on Chihuahuan desert grasslands: Transience and metastability
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DOI：
10.1029/2008jg000833
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发表时间：
2009-01-24
影响因子：
3.7
通讯作者：
Archer, Steven R.
中科院分区：
文献类型：
--
作者：
Okin, Gregory S.;D'Odorico, Paolo;Archer, Steven R.
利用一个简化的草-灌木动态模型，研究了当草地比灌木具有竞争优势时，草地人口过程对草地-灌丛动态的影响。该模型表明，草地生物量和土壤侵蚀之间的反馈可能会导致向灌丛状态的突然转变。该模型解释了草类补充量或死亡的简单变化，可能与气候变化或放牧有关，可能会导致全新世植物群的变化，以及草原向灌木丛的转变，这在过去150年里一直在整个美国西南部被观察到。
A simplistic model of grass-shrub dynamics was used to investigate the role of grass demographic processes on grassland-shrubland dynamics when grasses are in competitive advantage over shrubs. The model suggests that a feedback between grass biomass and soil erosion may cause an abrupt transition to a shrubland state. The model explains how a simple change in either grass recruitment or grass mortality, presumably linked to climate change or grazing, could produce changes in Holocene flora and the conversion of grasslands to shrublands, which has been observed throughout the southwestern U. S. in the past 150 years.