东北森林净第一性生产力与碳收支对气候变化的响应  

Simulating the responses of forest net primary productivity and carbon budget to climate change in Northeast China

作　　者：赵俊芳[1,2] 延晓冬[1] 贾根锁[1] 

机构地区：[1]中国科学院大气物理研究所,东亚区域气候环境重点实验室,北京100029 [2]中国科学院研究生院,北京100049

出　　处：《生态学报》2008年第1期92-102,共11页Acta Ecologica Sinica

基　　金：国家重点基础研究发展资助项目(973计划)(2006CB400500);国家自然科学基金资助项目(40675408)~~

摘　　要：以东北地区(38°43′N^53°34′N,115°37′E^135°5′E)为研究对象,利用当前气候状况和不同气候情景下的气象数据驱动基于个体生长过程的中国森林生态系统碳收支模型FORCCHN,模拟了气候变化对东北森林生态系统净第一性生产力(NPP)和碳收支(NEP)的影响。结果表明:1981~2002年期间,东北森林NPP总量位于0.27~0.40 PgC.a-1之间,平均值为0.34 PgC.a-1;土壤呼吸总量在0.11~0.27 PgC.a-1,平均为0.19 PgC.a-1;NEP总量位于0.11~0.18 PgC.a-1之间,且近20多年来该区森林起着CO2汇的作用,平均每年吸收0.15 Pg C的CO2;该区森林NPP和NEP对温度升高比对降雨变化的反应更为敏感;综合降雨增加(20%)和气温增加(3℃)的情况,该区各点森林的NPP和NEP增加的幅度最大;温度不变、降水增加(不变)情景下最小。The impacts of climate change on net primary productivity （NPP） and carbon budget （NEP） of forest ecosystems in Northeast China （38°43′N- 53°34′N, 115°37′E- 135°5′E） were simulated under present climate condition and different climate scenarios using forest carbon budget model FORCCHN that based on growth process of individual trees. The results showed that： from 1981 to 2002, the total amount of NPP in study area fluctuated between 0.27 and 0.40 PgC·a^-1 , and the mean value was 0.34 PgC·a^-1 The total soil respiration was from 0.11 to 0.27 PgC·a^-1, and the mean value was 0.19 PgC·a^-1. The total amount of NEP was from 0.11 to 0.18 PgC ·a^-1 ; The forest played a positive role in absorbing carbon dioxide during past twenty years, and every year it absorbed 0.15 Pg C carbon dioxide on average. NPP and NEP were more sensitive to increase of air temperature than the change of precipitation ; Synthesizing 20% increase in precipitation and 3℃ increase in temperature, NPP and NEP enhanced rapidly, and finally minimal changes were found under scenarios of no change in air temperature and increase or no change in precipitation.

关 键 词：东北森林 碳收支 净第一性生产力 气候变化 响应 

分 类 号：S718.5[农业科学—林学]