Differential responses of short-term soil respiration dynamics to the experimental addition of nitrogen and water in the temperate semi-arid steppe of Inner Mongolia, China

文献类型： 外文期刊

第一作者： Qi, Yuchun

作者： Qi, Yuchun;Liu, Xinchao;Dong, Yunshe;Peng, Qin;Sun, Liangjie;Jia, Junqiang;Cao, Congcong;Liu, Xinchao;Sun, Liangjie;Jia, Junqiang;Cao, Congcong;He, Yating

作者机构：

关键词： Soil respiration;Short-term response;N addition;Simulated rainfall;Temperate steppe

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：5.565； 五年影响因子：5.066 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： We examined the effects of simulated rainfall and increasing N supply of different levels on CO_2 pulse emission from typical Inner Mongolian steppe soil using the static opaque chamber technique, respectively in a dry June and a rainy August. The treatments included NH_4NO_3 additions at rates of 0, 5, 10, and 20 g N/(m~2·year) with or without water. Immediately after the experimental simulated rainfall events, the CO_2 effluxes in the watering plots without N addition (WCK) increased greatly and reached the maximum value at 2 hr. However, the efflux level reverted to the background level within 48 hr. The cumulative CO_2 effluxes in the soil ranged from 5.60 to 6.49 g C/m~2 over 48 hr after a single water application, thus showing an increase of approximately 148.64% and 48.36% in the effluxes during both observation periods. By contrast, the addition of different N levels without water addition did not result in a significant change in soil respiration in the short term. Two-way ANOVA showed that the effects of the interaction between water and N addition were insignificant in short-term soil CO_2 effluxes in the soil. The cumulative soil CO_2 fluxes of different treatments over 48 hr accounted for approximately 5.34% to 6.91% and 2.36% to 2.93% of annual C emission in both experimental periods. These results stress the need for improving the sampling frequency after rainfall in future studies to ensure more accurate evaluation of the grassland C emission contribution.

分类号： X21

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