文献类型：期刊文献

英文题名：Effects of canopy gaps on N2O fluxes in a tropical montane rainforest in Hainan of China

作者：Yang, Huai[1,2] Detto, Matteo[3] Liu, Shirong[2] Yuan, Wenping[4] Hsieh, Cheng-, I[5] Wang, Xu[1] Chen, Renli[1] Chen, Huai[6,7] Peng, Changhui[8,9] Jiang, Xinhua[6,7] Li, Yide[1] Xu, Han[1] Liu, Wenjie[4,10] Yang, Qiu[10]

第一作者：杨怀

通信作者：Chen, H[1];Chen, H[2]

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Guangdong, Peoples R China;[2]Chinese Acad Forestry, Inst Forest Ecol Environm & Protect, Key Lab Forest Ecol & Environm, State Forestry Adm, Beijing 100091, Peoples R China;[3]Smithsonian Trop Res Inst, Apartado Postal 0843-03092, Balboa, Ancon, Panama;[4]Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Cryospher Sci, Lanzhou 730000, Peoples R China;[5]Natl Taiwan Univ, Dept Bioenvironm Syst Engn, Taipei 10617, Taiwan;[6]Chinese Acad Sci, Chengdu Inst Biol, Key Lab Mt Ecol Restorat & Bioresource Utilizat, Chengdu 610041, Peoples R China;[7]Chinese Acad Sci, Chengdu Inst Biol, Ecol Restorat Biodivers Conservat Key Lab Sichuan, Chengdu 610041, Peoples R China;[8]Northwest A&F Univ, Coll Forestry, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Peoples R China;[9]Univ Quebec Montreal, Dept Biol Sci, Inst Environm Sci, Montreal, PQ C3H 3P8, Canada;[10]Hainan Univ, Inst Trop Agr & Forestry, Haikou 570228, Hainan, Peoples R China

年份：2017

卷号：105

起止页码：325-334

外文期刊名：ECOLOGICAL ENGINEERING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000404305300035)】；

基金：This study is jointly supported by the National Natural Science Foundation of China (41663010); the National Natural Science Foundation of China (41201061); the Fundamental Research Funds for the Central Non-profit Research Institution of Chinese Academy of Forestry (CAFYBB2014QA010); the Fundamental Research Funds for the Central Non-profit Research Institution of Tropical Forestry, Chinese Academy of Forestry (RITFYWZX2012-02); China Qianren Project; the Lecture and Study Program for Outstanding Scholars from Home and Abroad (CAFYBB2011007); the ForestGEO, Smithsonian Institute.

语种：英文

外文关键词：Climate change; Tropical forest; Greenhouse gas; Soil moisture; Soil temperature

摘要：Background and aims: Tropical montane rainforests play an important role in increasing atmospheric N2O concentration. Although accurate estimations of N2O fluxes in tropical montane rainforests are critical for predicting global climate change, there are still considerable uncertainties about the spatial and temporal variability of the emissions. This study aims to investigate the effects of canopy gap caused by typhoons on N2O emissions, a key factor for understanding the spatial heterogeneity and supporting environmental regulations. Methods: N2O fluxes were measured monthly using static chambers both inside and outside two large canopy gaps in the tropical montane rainforest of the Jianfengling National Natural Reserve on Hainan Island, south of China, from August 2012 to July 2013. Results: Mean annual N2O emissions were 2.19 +/- 0.43 kg N2O-N ha(-1) yr(-1) inside canopy gaps, and 1.19 +/- 0.29 kg N2O-N ha(-1) yr(-1) outside canopy gaps, revealing substantial differences in N2O emissions resulting from forest structure. Moreover, N2O emission rates within canopy gaps during the wet season (2.89 kg N2O-N ha(-1) yr(-1)) were significantly higher than those during the dry season (1.34 kg N2O-N ha(-1) yr(-1)), suggesting strong regulation of soil moisture and precipitation in controlling soil N dynamics. However, there were significant nonlinear relationships between N2O fluxes and water filled pore space, and soil temperature within canopy gaps, but no significant relationships were found under the closed canopy. Conclusions: Contribution of canopy gaps should be considered to avoid underestimation of N2O emission rates from disturbed forests. Interestingly, emissions from gaps are more strongly coupled with climate drivers (moisture and temperature), with important implications for climate change projections. Therefore, the further research is needed to study the biogeochemical processes and mechanisms behind such phenomenon. (C) 2017 Elsevier B.V. All rights reserved.