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实时、准确地掌握区域水土流失时空变异规律是制定有效水土保持措施的关键.但目前水土流失时空规律分析鲜有兼顾定量数值特征与空间可视化特征.本研究利用探索性空间分析方法和遥感信息,在景观尺度上,对1994～2003年间浙江安吉县水土流失的时空动态格局进行分析.结果表明,10年间安吉县水土流失强度增加、影响范围扩大、水土流失高风险区面积增加.在500m×500m和1 000m×1 000m2种格网尺度上,水土流失空间格局均表现出明显的空间集聚性,但以500m×500m尺度上的表现更为显著.这种探索性空间分析方法,从定量的统计学和可视化角度有效地揭示了水土流失的时空变异规律,为相关部门和人员定量评价水土流失,制定有效的水保措施提供了新的方法和手段.
Real-time and accurate grasp of the law of spatio-temporal variation of regional soil and water loss is the key to formulate effective soil and water conservation measures.But the present analysis of spatio-temporal regularity of soil and water loss rarely takes into account both quantitative numerical features and spatial visual characteristics.In this study, exploratory spatial analysis and remote sensing information, On the landscape scale, the temporal and spatial dynamic patterns of soil and water loss in Anji County of Zhejiang Province during 1994-2003 were analyzed.The results showed that the intensity of soil and water loss increased in Anji County in the past 10 years, the scope of influence increased, and the area of high risk area of soil erosion increased.At 500m × 500m And 1 000 m × 1 000 m on the grid scale, the spatial pattern of soil and water loss shows obvious spatial agglomeration, but the scale of 500m × 500m is more significant. This exploratory spatial analysis method, from the quantitative statistics Learning and visualization effectively revealed the spatial and temporal variation of soil and water loss and provided new methods and means for relevant departments and personnel to quantitatively assess soil and water loss and formulate effective measures for soil and water conservation.