Ecological responses of Stipa steppe in Inner Mongolia to experimentally increased temperature and precipitation. 3: Soil respiration

文献类型： 外文期刊

第一作者： Wang, Xuexia

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

作者机构：

关键词： carbon expenditure; simulated climate change; 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

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收录情况： SCI

摘要： The response of soil respiration to simulated climatic warming and increased precipitation was evaluated on the arid-semi-arid Stipa steppe of Inner Mongolia. Soil respiration rate had a single peak during the growing season, reaching a maximum in July under all treatments. Soil temperature, soil moisture and their interaction influenced the soil respiration rate. Relative to the control, warming alone reduced the soil respiration rate by 15.6 +/- 7.0%, whereas increased precipitation alone increased the soil respiration rate by 52.6 +/- 42.1%. The combination of warming and increased precipitation increased the soil respiration rate by 22.4 +/- 11.2%. When temperature was increased, soil respiration rate was more sensitive to soil moisture than to soil temperature, although the reverse applied when precipitation was increased. Under the experimental precipitation (20% above natural rainfall) applied in the experiment, soil moisture was the primary factor limiting soil respiration, but soil temperature may become limiting under higher soil moisture levels.

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