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中国亚热带丘陵区马尾松林氧化亚氮排放
作者姓名:CHEN Dan  FU Xiao-Qing  WANG Cong  LIU Xin-Liang  LI Hang  SHEN Jian-Lin  WANG Yi  LI Yong  WU Jin-Shui
作者单位:Changsha Research Station for Agricultural and Environmental Monitoring,Key Laboratory of Agro-ecological Processes in Subtropical Region,Institute of Subtropical Agriculture,Chinese Academy of Sciences
基金项目:supported by the National Basic Research Program of China(No.2012CB417105);the International Partnership Program for Creative Research Team of Chinese Academy of Sciences/the State Administration of Foreign Experts Affairs of China(Nos.KZCX2-YW-T07 and 20100491005-8);the 100 Talents Programme of Chinese Academy of Sciences
摘    要:The forest ecosystem plays a pivotal role in contributing greenhouse gases to the atmosphere.In order to characterize the temporal pattern of nitrous oxide(N_2O) emissions and identify the key factors affecting N_2O emissions from a Masson pine forest in a hilly red-soil region in subtropical central China,we measured the N_2O emissions in Jinjing of Hunan Province using the static chambergas chromatographic method for 3 years(2010-2012) and analyzed the relationships between the N_2O fluxes and the environmental variables.Our results revealed that the N_2O fluxes over the 3 years varied from-36.0 to 296.7 μg N m~(-2) h~(-1),averaging 18.4±5.6 μg N m~(-2) h~(-1)(n=3).The average annual N_2O emissions were estimated to be 1.6±0.3 kg N ha~(-1) year~(-1).The N_2O fluxes exhibited clear intra-annual(seasonal) variations as they were higher in summers and lower in winters.Compared with other forest observations in the subtropics,N_2O emissions at our site were relatively high,possibly due to the high local dry/wet N deposition,and were mostly sensitive to variations in precipitation and soil ammonium N content.In this work,a multiple linear regression model was developed to determine the influence of environmental factors on N_2O emissions,in which a category predictor of "Season" was intentionally used to account for the seasonal variation of the N_2O fluxes.Such a model explained almost 40%of the total variation in daily N_2O emissions from the Masson pine forest soil studied(P0.001).

关 键 词:environmental  factors  multiple  linear  regression  model  N  deposition  season  subtropical  forests

Nitrous oxide emissions from a Masson pine forest soil in subtropical central China
CHEN Dan,FU Xiao-Qing,WANG Cong,LIU Xin-Liang,LI Hang,SHEN Jian-Lin,WANG Yi,LI Yong,WU Jin-Shui.Nitrous oxide emissions from a Masson pine forest soil in subtropical central China[J].Pedosphere,2015,25(2):263-274.
Authors:CHEN Dan  FU Xiao-Qing  WANG Cong  LIU Xin-Liang  LI Hang  SHEN Jian-Lin  WANG Yi  LI Yong and WU Jin-Shui
Institution:Changsha Research Station for Agricultural and Environmental Monitoring, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan 410125 (China)
Abstract:
Keywords:environmental factors  multiple linear regression model  N deposition  season  subtropical forests
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