文献类型：期刊文献

英文题名：Effects of Nitrogen Additions on Soil Respiration in an Asian Tropical Montane Rainforest

作者：Wu, Fangtao[1,2] Peng, Changhui[1,2,3] Liu, Weiguo[1,2] Liu, Zhihao[1,2] Wang, Hui[1,2] Chen, Dexiang[4] Li, Yide[4]

第一作者：Wu, Fangtao

通信作者：Peng, CH[1];Peng, CH[2];Peng, CH[3]

机构：[1]Northwest A&F Univ, Coll Forestry, Ctr Ecol Forecasting & Global Change, Yangling 712100, Shaanxi, Peoples R China;[2]Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China;[3]Univ Quebec Montreal, Inst Environm Sci, Dept Biol Sci, CP 8888, Montreal, PQ H3C 3P8, Canada;[4]Chinese Acad Forestry, Res Inst Trop Forestry, Jianfengling Natl Key Field Observat & Res Stn Fo, Guangzhou 510520, Peoples R China

年份：2021

卷号：12

期号：6

外文期刊名：FORESTS

收录：;EI(收录号：20212710577933);Scopus(收录号：2-s2.0-85108876381);WOS:【SCI-EXPANDED(收录号:WOS:000666059600001)】；

基金：This study was supported by the National Key R&D Program of China (2016YFC0500203) and a Natural Sciences and Engineering Research Council of Canada Discovery Grant.

语种：英文

外文关键词：nitrogen addition; soil respiration; temperature sensitivity; tropical forest

摘要：Understanding the impacts of nitrogen (N) addition on soil respiration (R-S) and its temperature sensitivity (Q(10)) in tropical forests is very important for the global carbon cycle in a changing environment. Here, we investigated how R-S respond to N addition in a tropical montane rainforest in Southern China. Four levels of N treatments (0, 25, 50, and 100 kg N ha(-1) a(-1) as control (CK), low N (N25), moderate N (N50), and high N (N100), respectively) were established in September 2010. Based on a static chamber-gas chromatography method, R-S was measured from January 2015 to December 2018. R-S exhibited significant seasonal variability, with low R-S rates appeared in the dry season and high rates appeared in the wet season regardless of treatment. R-S was significantly related to the measured soil temperature and moisture. Our results showed that soil R-S increased after N additions, the mean annual R-S was 7% higher in N25 plots, 8% higher in N50 plots, and 11% higher in N100 plots than that in the CK plots. However, the overall impacts of N additions on R-S were statistically insignificant. For the entire study period, the CK, N25, N50, and N100 treatments yielded Q(10) values of 2.27, 3.45, 4.11, and 2.94, respectively. N addition increased the temperature sensitivity (Q(10)) of R-S. Our results suggest that increasing atmospheric N deposition may have a large impact on the stimulation of soil CO2 emissions from tropical rainforests in China.