文献类型：期刊文献

英文题名：Responses of soil CH4 fluxes to nitrogen addition in two tropical montane rainforests in southern China

作者：Wu, Fangtao[1,2] Peng, Changhui[1,2,3] Wang, Chuanyao[1,2] Chen, Huai[4] Liu, Weiguo[2] Liu, Zhihao[1,2] Wang, Hui[1,2] Li, Hong[5] Chen, Dexiang[6] Li, Yide[6] Liu, Shirong[7]

第一作者：Wu, Fangtao

通信作者：Peng, CH[1]

机构：[1]Northwest Agr & Forestry Univ, Coll Forestry, Ctr Ecol Forecasting & Global Change, Yangling 712100, Shaanxi, Peoples R China;[2]Northwest Agr & Forestry Univ, Coll Forestry, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China;[3]Univ Quebec, Inst Environm Sci, Dept Biol Sci, CP 8888,Succ Ctr Ville, Montreal, PQ H3C 3P8, Canada;[4]Chinese Acad Sci, Chengdu Inst Biol, Chengdu 610041, Peoples R China;[5]Chongqing Univ, Sch Architecture & Urban Planning, Chongqing 400044, Peoples R China;[6]Chinese Acad Forestry, Res Inst Trop Forestry, Jianfengling Natl Key Field Observat & Res Stn Fo, Guangzhou 510520, Peoples R China;[7]Chinese Acad Forestry, Res Inst Forest Ecol Environm & Protect, Beijing 100091, Peoples R China

年份：2022

卷号：9

外文期刊名：FOREST ECOSYSTEMS

收录：;Scopus(收录号：2-s2.0-85128201000);WOS:【SCI-EXPANDED(收录号:WOS:000792601200006)】；

基金：The work was funded by the National Key R&D Program of China (No. 2016YFC0500203) and a Natural Sciences and Engineering Research Council of Canada Discovery Grant.

语种：英文

外文关键词：Atmospheric nitrogen deposition; Greenhouse gases; Soil CH 4 flux; Tropical rainforest

摘要：Background: Atmospheric nitrogen (N) deposition is projected to increase in the next few decades, which may have a marked impact on soil-atmosphere CH4 fluxes. However, the impacts of increased atmospheric N depositions on soil CH4 flux in tropical rainforests are still poorly understood. From January 2015 to December 2018, a field experiment was conducted in a primary tropical montane rainforest (PTMR) and a secondary tropical montane rainforest (STMR) in southern China to quantify the impact of N additions at four levels (N0: 0 kg N center dot ha-1 center dot year-1; N25: 25 kg N center dot ha-1 center dot year-1; N50: 50 kg N center dot ha-1 center dot year-1; N100: 100 kg N center dot ha-1 center dot year-1) on soil CH4 flux. Results: Four years of measurements showed clear seasonal variations in CH4 flux in all treatment plots for both forest types (PTMR and STMR), with lower rates of soil CH4 uptake during the wet season and higher rates of soil CH4 uptake during the dry season. Soil CH4 uptake rates were significantly and negatively correlated with both soil temperature and soil moisture for both forest types. Annual CH4 uptake for the N0 plots from the PTMR and STMR soils were -2.20 and -1.98 kg N center dot ha-1 center dot year-1, respectively. At the PTMR site, mean CH4 uptake compared with the N0 treatment was reduced by 19%, 29%, and 36% for the N25, N50, and N100 treatments, respectively. At the STMR site, mean CH4 uptake compared with the N0 treatment was reduced by 15%, 18%, and 38% for the N25, N50, and N100 treatments, respectively. High level N addition had a stronger inhibitory impact on soil CH4 uptake than did the low level N addition. Conclusion: Our data suggest that soil CH4 uptake in tropical rainforests is sensitive to N deposition. If atmospheric N deposition continues to increase in the future, the soil CH4 sink strength of tropical rainforests may weaken further.