三江平原典型湿地的多尺度人为干扰格局研究

采用多尺度滑动窗口算法,分析三江平原典型湿地的人为干扰空间格局,确定土地利用类型在建三江湿地生态系统中的受人为干扰度(pd)及干扰邻近度(pdd)。结果表明:1)2001—2006年间研究区土地利用类型的变化对多尺度的干扰格局分布有极大影响,耕地干扰比例高达37.94%。2)人为干扰度类型c1、c2在水域、林地和沼泽分布较广,干扰值较小;而水田和旱地占干扰度c7、c8的74.38%和61.76%,说明耕地是建三江区湿地生态系统主要人为干扰源。3)多尺度干扰邻近度证明人为干扰是在一定尺度上发生,当pd0.4或pd0.7且pddpd时,人为干扰对周边土地利用类型必定产生影响。

Patterns of human disturbance at multiple scales in the wetland of Sanjiang Plain,northeastern China

To analyze the patterns of human disturbance in the wetland ecological system of Jiansanjiang plain, northeastern China, we measured the proportion of disturbance (pd) and its adjacency (pdd) of land cover using a moving window algorithm. The results show that the change of land use has a significant effect on the disturbance patterns at multiple scales from 2001 to 2006, and the cropland disturbance proportion reached 37.94%. The disturbance clusters 1 (C1) and 2 (C2) mainly occurred at water, forest and marsh region, with small values of disturbance. However, rice field and cropland accounted for 74% and 62% of the proportion of disturbance at the cluster C7 and C8, respectively, indicating cultivation is the main influence factor which disturbs the wetland ecological system at this region. Disturbance adjacency at multiple scales verifies that human disturbance occurred at certain scales. When pd<0.4 or pd>0.7 and pdd>pd, human disturbance had effects on the patterns of land cover.