Ecological responses of Stipa steppe in Inner Mongolia to experimentally increased temperature and precipitation. 2: Plant species diversity and sward characteristics

文献类型： 外文期刊

第一作者： Wan, Zhiqiang

作者： Wan, Zhiqiang;Yan, Yulong;Chen, Yali;Gu, Rui;Yang, Jie;Wan, Zhiqiang;Yan, Yulong;Chen, Yali;Gao, Qingzhu;Gu, Rui

作者机构：

关键词： climate change; density; ecosystem; productivity; species numbers; typical steppe

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

ISSN： 1036-9872

年卷期： 2018 年 40 卷 2 期

页码：

收录情况： SCI

摘要： The responses of plant community diversity and sward characteristics to temperature and moisture changes on the Stipa steppe in Inner Mongolia were investigated in the growing season from 2013 to 2015. Warming significantly (P< 0.05) increased biomass and density. Highest biomass and density were achieved with warming and precipitation combined, whereas increased precipitation alone had no significant effect. Warming increased the Shannon Weiner diversity index, which was significantly correlated with both air temperature (R-2 =0.45, P< 0.05) and soil temperature (R-2 = 0.255 P< 0.05), and it was further increased by the combination of warming and increased precipitation. The Simpson index, an alternative measure of diversity that is not as sensitive to species richness, was less responsive to either warming or increased precipitation. Overall, warming had a more substantial effect than increased precipitation on the characteristics of the Slipa steppe community. However, its impact was complex, with significant variance among the 3 years of the study. The impacts of future changes in precipitation are also likely to be complex and warrant further research.

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