Increasing carbon storage in subtropical forests over the Yangtze River basin and its relations to the major ecological projects
Increasing carbon storage in subtropical forests over the Yangtze River basin and its relations to the major ecological projects
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长江流域亚热带森林碳储量增加及其与重大生态工程的关系
DOI：
10.1016/j.scitotenv.2019.136163
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发表时间：
2020-03-20
影响因子：
9.8
通讯作者：
Chen, Xi
中科院分区：
文献类型：
--
作者：
Kong, Rui;Zhang, Zengxin;Chen, Xi
森林碳储量在全球碳收支中具有重要作用。基于1993-2012年卫星观测和LPJ模式模拟的地上生物量碳（ABC）数据，采用累积曲线分析和气候敏感性分析方法，分析了长江流域亚热带森林碳储量的时空变化及其与气候变化和人类活动的关系。结果表明：(1)总体上看，近20年来长江流域森林ABC明显增加，ABC从1993年的2563.91 Tg C上升到2012年的2893.17 Tg C，增长率为12.84%；ABC较高的分布主要集中在嘉陵江流域和汉江流域，长江流域大部分地区呈显著上升趋势；(2)森林ABC对温度和降水变化较为敏感。气温每增加1℃，长江流域ABC将增加3.32%，降水每增加10%，ABC将减少-6.12%；(3)森林ABC增长率由1993-2000年的3.15%加速到2001-2012年的8.01%。2000年以后，森林ABC的累积曲线普遍高于气温或降水。1993 - 2012年，气候变化和人类活动导致的总面积分别占30.5%和52.59%，ABC分别增加67.52 Tg C和188.74 Tg C。重大林业工程的实施可能是长江流域森林ABC快速增长的主要原因。研究结果表明，生态工程等人类活动可能是加速中国绿化趋势的原因之一，并强调了亚热带森林ABC在中国碳收支中的关键作用。(C) 2019 Elsevier B.V.版权所有
Forest carbon stocks has an important role in the global carbon budget. Based on the satellite-observed and LPJ model simulated aboveground biomass carbon (ABC) data, the spatial and temporal changes of subtropical forest carbon storage in the Yangtze River basin and its relations to the climate variation and human activities were analyzed by using the methods of cumulative curve analysis and climate sensitivity analysis during 1993-2012. The results revealed that: (1) In general, the forest ABC increased obviously in the Yangtze River basin during the past 20 years, and the ABC rose from 2563.91 Tg C in 1993 to 2893.17 Tg C in 2012, with a growth rate of 12.84%. The higher ABC distribution was mainly concentrated in the Jialing River basin and Hanjiang River basin and the significantly increasing trends could be found in most area of the Yangtze River basin; (2) The forest ABC was sensitive to the changes of temperature and precipitation. When the temperature increases by 1 degrees C, the ABC in the Yangtze River basin will increase by 3.32%, while it will decrease by -6.12% when the precipitation increases by 10%; (3) The forest ABC growth rate had accelerated from 3.15% in 1993-2000 to 8.01% in 2001-2012. The cumulative curve of the forest ABC was generally higher than the temperature or the precipitation after 2000. The total areas induced by climate variation and human activities accounted for 30.5% and 52.59% with an increases in ABC by 67.52 Tg C and 188.74 Tg C from 1993 to 2012, respectively. The implementation of major forestry projects might be the main reason for the rapid increase of forest ABC in the Yangtze River basin. This study suggested human activities such as ecological projects might contribute to the accelerated greening trend and highlighted the pivotal role of subtropical forest ABC in the carbon budget in China. (C) 2019 Elsevier B.V. All rights reserved.