基于MODIS-NPP数据的耕地生产力时空特征分析——以北京市2001—2005年为例

粮食安全是关乎国计民生的重大战略问题。对区域耕地生产力进行科学评价,研究耕地生产力的时空演变规律对于挖掘耕地生产潜力、保障粮食安全等具有重大价值。该文基于北京市2001—2005年MODIS-NPP数据,通过空间自相关分析法、变异系数法和Sen-Man Kendall趋势检验等方法对北京市耕地生产力进行时空特征分析,研究北京市耕地生产力的空间集聚特征、稳定性及变化趋势。结明表明,北京市耕地生产力空间分异显著,北部和中部较高、南部较低,北京市耕地生产力整体呈现改善趋势。

Food safety is a major strategic issue related to the national economy and people’s livelihood.The scientific evaluation of regional cultivated land productivity and the study of the spatial-temporal evolution law of cultivated land productivity are of great value for tapping the production potential of cultivated land and ensuring food safety.Based on the MODIS-NPP data of Beijing from 2001 to 2005,this paper analyzes the spatial-temporal characteristics of cultivated land productivity in Beijing by means of spatial autocorrelation analysis,coefficient of variation and Sen-Man Kendall trend test,and studies the spatial agglomeration characteristics,stability and changing trend of cultivated land productivity in Beijing.The results showed that the spatial variation of cultivated land productivity in Beijing was significant,with higher values in northern and central regions and lower values in southern regions.The cultivated land productivity in Beijing showed an over-all improvement trend.