Testing a non-equilibrium model of rangeland vegetation dynamics in Mongolia

摘要: Summary 1. Few studies have tested the applicability of current non-equilibrium models rangeland vegetation dynamics to a particular ecosystem, or across range systems that might be expected respond differently grazing. This study assessed extent which persistent (NEP) model applies three distinct Mongolian ecosystems, desert-steppe, steppe and mountain-steppe. 2. Standing biomass, cover composition, species richness diversity were examined along grazing pressure gradients in ecological zones differing productivity interannual variability precipitation. 3. In functional group cover, did not vary gradients, but all variables except weedy annuals unpalatable forbs varied significantly between years. Vegetation this zone largely conformed NEP dynamics. 4. In mountain-steppe, grass total vegetative grasses, forbs, gradients. With increasing pressure, grasses decreased increased, as conventional condition (RC) predicts. Interannual variation precipitation influenced diversity. 5. In steppe, forb grass, forb, annual Grass biomass responded interactively rainfall Forb Grasses increased with conforming RC model. 6. Ecosystem response is complex, interpretation depends on specific examined. The recent paradigm shift science from has been embraced such enthusiasm by some concept rangelands may much danger being misapplied equilibrium-based been.