Relationship between nitrogen deposition and LUCC and its impact on terrestrial ecosystem carbon budgets in China

作     者：LU XueHe JIANG Hong ZHANG XiuYing JIN JiaXin 

作者机构：Jiangsu Provincial Key Laboratory of Geographic Information Science and TechnologyNanjing University International Institute for Earth System ScienceNanjing University 

出 版 物：《Science China Earth Sciences》 (中国科学:地球科学(英文版))

年 卷 期：2016年第59卷第12期

页      面：2285-2294页

核心收录：

学科分类：07[理学] 0708[理学-地球物理学] 0704[理学-天文学] 0713[理学-生态学] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.41501212) the National Natural Science Foundation of China Major Program(Grant No.41171324) Funds for Ph.D.Education(Grant No.20110091110028) the MOST Fundamental Research Project(Grant No.2005DKA32306) 

主　　题：Carbon budget Nitrogen deposition Land-use and land-cover change Remote sensing Model simulation 

摘      要：Increased nitrogen(N) deposition and land-use and land-cover change(LUCC) have influenced the terrestrial ecosystem carbon budget in China over the past few decades.However,the coupling effects of N deposition and LUCC on the carbon cycle remain unclear.This study first evaluated the effects of LUCC on N deposition based on estimated N deposition data from NOcolumn remote sensing data and the GlobeLand30 LUCC dataset,and then assessed the coupling effects of N deposition and LUCC on carbon budgets in China based on a terrestrial ecosystem process-based model.The results showed that the average rate of increase in N deposition in China was 0.35 Tg N yr(Tg = 10g),which caused net primary production(NPP) and net ecosystem production(NEP) to rise by 92.2 Tg C yrand 46.9 Tg C yr,respectively.The effects of LUCC reduced N deposition by 0.21 GgNyr(Gg= 10~9g).The land changed from forest to cropland had the greatest rate of increase in N deposition among all types of land-cover change.Changes from cropland to forest slowed the rate of N deposition increase the most.Generally,the change in N deposition resulting from LUCC reduced NPP and NEP by 0.7 and 0.4 Gg C yr,respectively.Compared with the total effects of N deposition on NPP and NEP,N deposition changes caused by LUCC had a limited aggregate effect on the C budget.