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

查看全文 作　　者：Yuchun [1]Qi;Xinchao [1,2]Liu;Yunshe [1]Dong;Qin [1]Peng;Yating [3]He;Liangjie [1,2]Sun;Junqiang [1,2]Jia;Congcong [1,2]Cao

机构地区：[1]Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences;[2]University of the Chinese Academy of Sciences;[3]Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences

出　　处：《Journal of Environmental Sciences》索引2014年第26卷第4期,共12页

基　　金：supported by the Knowledge Innovation Program of the Chinese Academy of Sciences(No.KZCX2-EW-302);the National Natural Science Foundation of China(No.41330528,41373084,and 41203054);the Special Fund for Agro-scientific Research in the Public Interest(No.201203012) 摘　　要：We examined the effects of simulated rainfall and increasing N supply of different levels on CO2 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 NH4NO3 additions at rates of 0, 5, 10, and 20 g N/(m2·year) with or without water. Immediately after the experimental simulated rainfall events, the CO2 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 CO2 effluxes in the soil ranged from 5.60 to 6.49 g C/m2over 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 CO2 effluxes in the soil. The cumulative soil CO2fluxes 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. 关键词：土壤呼吸半干旱草原内蒙古草原实验期短期带水动力学反应

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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

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引证文献(21)

耦合文献(417)

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