贵州植被NPP时空格局及其对气候变化的响应

Spatial and Temporal Pattern of Vegetation NPP Variations in Guizhou and Its Response to Cli⁃mate Change

贵州高原位于我国西南地区、云贵高原的中部,是长江中上游和珠江上游地区的生态关键地,对我国南部地区生态保护具有重要的理论意义和实践意义。NPP(植被净初级生产力)能有效反映植物群落在自然环境中的生产能力,也是评价生态环境的重要指标[1]。利用2001—2013年的遥感影像及气温、降水数据对贵州省各种植被NPP年际变化趋势进行研究。结果表明:贵州高原的NPP总体呈现微弱的下降趋势;植被类型中林地的NPP平均值最大,其次是草地、永久湿地、作物/自然植被镶嵌体、农作物、灌丛;NPP与年平均气温和降水的相关性分析显示,气温对NPP的影响高于降水。

Guizhou Province is located in the southwestern region of China,it is the central part of the Yunnan-Gui⁃zhou Plateau,and which is the upper reaches of the Yangtze River and the Pearl River.It is an important geographi⁃cal location for the ecological protection of the southern part of China.NPP(net primary productivity of vegetation)can effectively reflect the plant community in the natural environment of production capacity,and is an important in⁃dicator of the assessment of ecological and environmental services.The annual trend of NPP was analyzed by remote sensing image and the correlation analysis of temperature,precipitation from 2001 to 2013.Overall,the NPP in Gui⁃zhou Plateau shows a slight downward trend.Among the vegetation types,the average NPP of forest land is the larg⁃est,followed by grassland,permanent wetland,crops/natural vegetation inlays,crops and shrubs.The correlation be⁃tween NPP and annual mean temperature,NPP and precipitation were analyzed,the effect of temperature on NPP is higher than that of precipitation.