2011-2020年夏季全国草原净初级生产力时空变化及其气象影响评估

为评估2011—2020年夏季全国草地净初级生产力时空变化以及气象条件对净初级生产力的影响,本研究依据气象站逐日气象观测资料以及中分辨率成像光谱(Moderate-resolution imaging spectroradiometer,MODIS)系列卫星资料遥感数据,分析了近10年夏季全国草地净初级生产力变化。结果表明:2011—2020年夏季全国草原净初级生产力总体呈现增加趋势,平均每年增加0.2 gC·m^-2·a^-1,内蒙古中部、甘肃东部、青海东部、西藏东部等地近10年草原净初级生产力明显增加。近10年全国大部草原区平均气温和降水量均呈增加趋势,较好的气象条件利于夏季牧草生长。2020年夏季全国草原区的气温和降水量也较常年偏高,北方草原区草地平均净初级生产力为121.3 gC·m^-2·夏季^-1,为近10年偏好年份。2011—2020年夏季全国草原净初级生产力呈增加趋势,较好的气象条件对其贡献较大。

Spatial-temporal Changes of Summer Net Primary Productivity and its Reponse to Meteorological Impacts from 2011 to 2020 In China Grassland

On basis of the daily meteorological data and the MODIS satellite data,we analyzed the spatial-temporal changes of summer net primary productivity(NPP)in recent 10 years to assess the impact of meteorological factors on NPP in China grassland.The results showed a incearsing trends with an average annual increase by 0.2 gC·m^-2·a^-1 as a whole.There was an obvious increment in central Inner Mongolia,eastern Gansu,eastern Qinghai and eastern Tibet from 2011 to 2020.In the past decade,the average temperature and precipitation in most steppe rgions across the country revealed an increasing trend.It was conducive to the growth of summer pastures.Besides,the average temperature and precipitation in summer of 2020 were also comparatively high with a well average net primary productivity of 121.3 gC·m^-2·summer^-1 in northern grassland areas.