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.
Spatiotemporal variations of productivity and carbon use efficiency of forests in Eastern Inner Mongolia and their responses to drought from 2001 to 2021
The present study selected MODIS data and meteorological observation data from Inner Mongolia Au-tonomous Region between 2001 and 2021,and analyzed the seasonal variations of the Wetness Index in this re-gion,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 and703.12 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 south-east.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 car-bon sequestration capacity.In the eastern part of the Greater Khingan Range,the NPP and GPP showed an increas-ing 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.
Gross Primary Productivity(GPP)Net Primary Productivity(NPP)Carbon Use Efficiency(NPP/GPP)Wetness Index
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NSTL
万方数据
