2001—2013年开孔河流域净初级生产力遥感估算及其时空分布特征

Remotely-sensed Estimation of Net Primary Productivity and Its Spatial-temporal Characteristics in Kaidu-Kongque River Basin from 2001 to 2013

[目的]估算2001—2013年开孔河流域净初级生产力(NPP),并分析其时空分布特征和未来变化趋势,为自然资源的管理和有效利用提供依据。[方法]基于MODIS植被指数(NDVI)产品数据、气象数据和植被分类数据,利用改进的CASA模型。[结果]2001—2013年开孔河流域年均NPP呈逐渐增长趋势;空间上表现为西北高、东南低的特征,以开孔河为高值中心呈带状分布;NPP年内变化较大,夏季最高,占全年的65.30%,冬季仅有2.13%,为各季最低;Hurst指数与Slope趋势空间耦合图表明流域内未来NPP将呈增长趋势。[结论]开孔河流域生态环境呈良性发展的态势且季节差异明显、区域差异明显。

[Objective] The paper estimates the net primary productivity（NPP） of the Kaidu-Kongque river basin, and analyzes its spatial and temporal distribution characteristics and the future tendency, in order to provide the basis for the management and effective use of natural resources.[Methods] MODIS vegetation index（NDVI） data, meteorological and vegetation classification data was collected from 2001 to 2013. The improved CASA model was used.[Results] The annual NPP showed a gradually increasing trend, and it was high in northwest but low in southeast. The NPP values showed a zonal distribution with Kiadu-Kongque river as the center（highest NPP value）. The annual variation of NPP was great, the highest NPP occurred in summer（65.30%） while the lowest NPP occurred in winter （2.13%）. From the Hurst index and slope trend of NPP spatial coupling graph, an increasing trend in NPP could be expected in the future.[Conclusion] The development of ecological environment in the Kaidu-Kongque river basin is sustainable, and the seasonal and regional difference is obvious.