Effects of water and nitrogen addition on vegetation carbon pools in a semi-arid temperate steppe

文献类型： 外文期刊

第一作者： Jia, Junqiang

作者： Jia, Junqiang;Dong, Yunshe;Qi, Yuchun;Peng, Qin;Liu, Xinchao;Sun, Liangjie;Guo, Shufang;He, Yunlong;Cao, Congcong;Yan, Zhongqing;Jia, Junqiang;Guo, Shufang;He, Yunlong;Cao, Congcong;Yan, Zhongqing;Liu, Xinchao;Sun, Liangjie

作者机构：

关键词： Vegetation carbon pools;Increasing precipitation;Nitrogen addition;Interactive effect;Temperate steppe

期刊名称：JOURNAL OF FORESTRY RESEARCH （ 影响因子：2.149； 五年影响因子：1.877 ）

ISSN： 1007-662X

年卷期： 2016 年 27 卷 3 期

页码：

收录情况： SCI

摘要： Global change will lead to increases in regional precipitation and nitrogen (N) deposition in the semi-arid grasslands of northern China. We investigated the responses of vegetation carbon (C) pools to simulated precipitation and N deposition increases through field experiments in a typical steppe in Inner Mongolia. The treatments included NH4NO3 addition at concentrations of 0 (CK), 5 (LN, low nitrogen), 10 (middle nitrogen, MN), and 20 (HN, high nitrogen) (g m(-2) a(-1)) with and without water. After three consecutive years of treatment, from 2010 to 2012, water addition did not significantly change the size of the total vegetation C pools, but it significantly decreased the ratio of root:shoot (R:S) (P = 0.05) relative to controls. By contrast, N addition significantly increased the total vegetation C pools. The C pools in the LN, MN and HN treatments increased by 22, 39 and 44 %, respectively. MN produced the largest effect among the N concentrations, although differences between N-added treatments were not significant (P > 0.05). N addition significantly reduced the ratio of root:shoot (R:S) (P = 0.03). However, there were no significant interactive effects of water and N addition on the vegetation C pools.

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