Grazing Density Effects on Cover, Species Composition, and Nitrogen Fixation of Biological Soil Crust in an Inner Mongolia Steppe

被引:34
|
作者
Liu, Huajie [1 ]
Han, Xingguo [1 ]
Li, Linghao [1 ]
Huang, Jianhui [1 ]
Liu, Hongsheng [1 ]
Li, Xin [1 ]
机构
[1] Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
基金
中国国家自然科学基金;
关键词
acetylene reduction assay; nitrogen fixation; nitrogen input; soil stability; WIND EROSION; CRYPTOGAMIC CRUSTS; SEED-GERMINATION; DISTURBANCE; ECOSYSTEM; AUSTRALIA; COMMUNITY; IMPACTS; PLANTS; RATES;
D O I
10.2111/08-179.1
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Biological soil crusts (BSCs) are important in many arid arid semiarid ecosystems for their abilities to fix atmospheric nitrogen (N) and stabilize surface soil. Grazing disturbance has a profound influence on abundance, species composition, arid ecological functioning of BSCs. To elucidate the effects of grazing on BSCs in Inner Mongolia grasslands, all investigation was conducted in a typical steppe that had previously been subjected to long-term grazing with six grazing densities (control: 0 sheep.ha(-1), very light: 4 sheep.ha(-1), light: 8 sheep.ha(-1), medium: 12 sheep.ha(-1), heavy: 16 sheep.ha(-1), and very heavy: 20 sheep.ha(-1)). Cover, species composition, potential N-fixing activity, arid potential N input of BSC indicate that long-term grazing significantly reduced the importance of BSC in N input and soil stabilization. Such reductions were highly related to grazing density. Very light grazing had no significant effect on the role of BSC in soil stabilization, but resulted ill a 13.3% reduction in BSC N input potential. Heavy arid very heavy grazing led to a decrease of potential N input by one order of magnitude, and a decline of BSC function via a shift from high coverage of an attached group-dominated BSC community to a low coverage of a vagrant group-dominated community. Constraining grazing level to a very light density-and to a lesser extent, a light grazing density-is likely a preferred practice for conserving BSC arid the ecological services it provides ill N fixation and soil stabilization.
引用
收藏
页码:321 / 327
页数:7
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