Response of N 2 O emission to water and nitrogen addition in temperate typical steppe soil in Inner Mongolia, China

作者：Xinchao Liu, Yunshe Dong, Yuchun Qi, Qin Peng, Yating He, Liangjie Sun, Junqiang Jia, Shufang Guo, Congcong Cao, Zhongqing Yan, Xuehua Liu · 发表于：Soil and Tillage Research · 年份：2015 · DOI：10.1016/j.still.2015.01.008 · 被引用次数：39 · 研究领域：Soil Carbon and Nitrogen Dynamics、Peatlands and Wetlands Ecology、Soil and Water Nutrient Dynamics

The Chinese steppe is undergoing a drastic increase in nitrogen (N) deposition, and the precipitation in this region is predicted to increase. However, the response of soil N 2 O emissions to the coupling changes of precipitation and N deposition in grassland ecosystem has been seldom discussed. A manipulative field experiment was conducted to investigate the individual and interactive effects of precipitation increase and N deposition on soil N 2 O efflux in semi-arid temperate grassland in Inner Mongolia during the growing seasons of 2010 and 2011.The treatments included four N addition levels [20 g N m −2 y −1 (N20), 10 g N m −2 y −1 (N10), 5 g N m −2 y −1 (N5), and a zero-N control (CK)] and two water application levels [natural precipitation for dry (D) and 15% increase of long-term mean annual precipitation for wet (W) treatments]. Results indicated that N and water addition both significantly increased soil N 2 O effluxes ( P < 0.01). The maximum N 2 O emissions were observed within 2–3 days after N addition to all treatments, and the N 2 O effluxes in W treatments were generally higher than in D treatments for the same N input level. For the treatments without N inputs, the N 2 O emission peak of WCK was 9.8% higher than DCK in 2010. The effect of water addition on N 2 O emission was more evident when more N fertilizer was applied. For the high N input treatments, the maximum N 2 O emission of WN20 treatment was 222.6% higher than DN20 in 2010. The changes in N and wa...