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Vertebrate herbivore-induced changes in plants and soils: linkages to ecosystem functioning in a semi-arid steppe

作　　者：Di-Ma Chen、Shu-Xia Zheng、Yu-Mei Shan、Friedhelm Taube、Yong-Fei Bai
影响因子：4.567
刊物名称：Functional Ecology
出版年份：2012
卷：  期：  页码：doi: 10.1111/1365-2435.12027

论文摘要：

 1. Large grazing herbivores have been reported to determine the structure and function of
grassland ecosystems. However, the ecological linkages between structure and functioning
components have yet been thoroughly explored.
2. Here, we test the hypothesis of the impact of grazing on soil nematode community (e.g.
structure and composition) and linkages to ecosystem functioning (e.g. soil N mineralization
and ANPP) via changes in pathways of plant community, soil nutrients and soil environment
using a field experiment maintained for 5 years with seven levels of grazing intensity in the
Inner Mongolian grassland.
3. A structural equation model (SEM) with nematode abundances as response variables
showed that plant-feeding and fungal-feeding nematodes were driven by changes in the plant
community, and bacterial-feeding nematodes were affected by soil abiotic nutrients and environment,
while omnivorous + carnivorous nematodes were altered by soil environment and
bacterial-feeding nematodes. This indicates that the top-down control by grazing leads to
bottom-up control in the soil food web.
4. We found that grazing affected the ecosystem functioning via different pathways. Grazing
effects soil N mineralization by changing plant community, soil nutrients, soil environment
and nematodes community structure, while it affects ANPP by altering soil N mineralization
and soil environment.
5. Our findings could provide a better understanding of the responses of plants and soils to
grazing and the linkages between structure and functioning of above-ground and belowground
in the semi-arid steppe.
Key-words: grazing intensity, N mineralization, plant community, soil fauna, trophic groups
Introduction
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