2001—2021年内蒙古东部森林生产力和碳素利用率时空变化及其对干旱的响应  

Spatiotemporal variations of productivity and carbon use efficiency of forests in Eastern Inner Mongolia and their responses to drought from 2001 to 2021

作　　者：赵晶 李丹[2] ZHAO Jing;LI Dan(Hinggan League Meteorological Bureau,Ulanhot 137400,China;Inner Mongolia Ecological and Agricultural Meteorology Center,Hohhot 010051,China)

机构地区：[1]兴安盟气象局,内蒙古乌兰浩特137400 [2]内蒙古自治区生态与农业气象中心,内蒙古呼和浩特010051

出　　处：《气象与环境学报》2024年第6期70-77,共8页Journal of Meteorology and Environment

基　　金：内蒙古自治区气象局科研项目(nmqxkjcx202319);内蒙古自然科学基金(2024MS04007)共同资助。

摘　　要：选用2001—2021年内蒙古自治区MODIS资料和气象观测数据,分析该地区湿润度指数的季节变化以及内蒙古东部森林生态系统净初级生产力(Net Primary Productivity,NPP)、总初级生产力(Gross Primary Productivity,GPP)和碳素利用率(NPP/GPP)对干旱的响应特征。结果表明:内蒙古东部森林平均NPP和GPP分别为418.79 g C·m^(-2)·a^(-1)和703.12 g C·m^(-2)·a^(-1),NPP/GPP为0.59;NPP和GPP空间分布为北高南低,NPP/GPP为由西北向东南递减。2001—2021年内蒙古东部森林NPP和GPP由稳定型转为波动增长型,NPP/GPP以微弱增大趋势为主,固碳能力增强。大兴安岭东部地区NPP、GPP为增大趋势,北部地区为下降趋势,NPP/GPP整体变化幅度较小。夏季干旱对NPP、GPP增大的抑制作用较强,秋季干旱对NPP/GPP存在一定程度的影响。The present study selected MODIS data and meteorological observation data from Inner Mongolia Autonomous Region between 2001 and 2021,and analyzed the seasonal variations of the Wetness Index in this region,as well as the response characteristics of the net primary productivity(NPP),gross primary productivity(GPP),and carbon use efficiency(NPP/GPP)of the forest ecosystem in eastern Inner Mongolia to drought.The results showed that the average NPP and GPP of the forests in eastern Inner Mongolia were 418.79 g C·m^(-2)·a^(-1) and 703.12 g C·m^(-2)·a^(-1),respectively,and the NPP/GPP ratio was 0.59.The spatial distributions of NPP and GPP were higher in the north and lower in the south,while the NPP/GPP ratio decreased from northwest to southeast.From 2001 to 2021,the NPP and GPP of the forests in eastern Inner Mongolia shifted from a stable pattern to a fluctuating growth pattern,with the NPP/GPP ratio showing a weak increasing trend,indicating an enhanced carbon sequestration capacity.In the eastern part of the Greater Khingan Range,the NPP and GPP showed an increasing trend,while the northern region showed a decreasing trend,and the overall change in NPP/GPP was relatively small.Summer drought had a stronger inhibitory effect on the increase of NPP and GPP,while autumn drought had a certain degree of influence on the NPP/GPP.

关 键 词：总初级生产力(GPP) 净初级生产力(NPP) 碳素利用率(NPP/GPP) 湿润度指数 

分 类 号：P461.7[天文地球—大气科学及气象学]