Grazing primarily drives the relative abundance change of C-4 plants in the typical steppe grasslands across households at a regional scale

文献类型： 外文期刊

第一作者： Zhang, Qing

作者： Zhang, Qing;Ma, Wenjing;Kang, Sarula;Niu, Jianming;Ding, Yong;Hou, Xiangyang;Li, Xiliang;Sarula;Zhang, Qing;Li, Xin;Niu, Jianming

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关键词： grazing intensity;grazing preferences;Inner Mongolian grassland;temperature

期刊名称：RANGELAND JOURNAL （ 影响因子：1.09； 五年影响因子：1.51 ）

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收录情况： SCI

摘要： Increases in temperature and grazing intensity are believed to promote the relative abundance of C-4 plants in grassland communities in Inner Mongolia. However, there is a lack of understanding as to which factor is the primary driver at the household scale. The relative abundance of C-4 plants in grassland communities within 32 households was monitored over a 5-year period (2008-12) in the typical steppe region of Inner Mongolia. The relationships between the mean annual temperature, grazing intensity and their combinations on the patterns of the relative abundance of C-4 plants across the land managed by these households were analysed. The results showed that (1) the herbage mass of the typical steppe grassland was mainly composed of C-3 plants (87%); (2) the C-4 plants were more sensitive to, and can be used as indicators of, environmental changes. These C-4 species included Cleistogenes squarrosa (Trin.) Keng, Chenopodium glaucum Linn. and Salsola collina Pall.; (3) both increasing temperature and grazing intensity promoted the relative abundance of C-4 plants. Grazing intensity was the primary driver of the change in relative abundance of C-4 plants in this region. Not only did grazing change the micro-environment of the grasslands, but also the C-3 species were preferentially grazed by the livestock. Comparison of the results with previous studies on the temporal variation in the abundance of C-4 plants suggests that the relative importance of grazing and climatic factors depends on the spatial scales of the studies, with climate being of greater importance at the regional rather than the household scale.

分类号： S8

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