宁夏沿黄人工绿洲农田格局对景观多样性的影响——以卫宁平原灌区为例

乔荣荣, 黄海涛, 董春媛, 罗立辉, 常学礼

Analysis of the influence of farmland pattern on landscape diversity in artificial oasis along the Yellow River in Ningxia： a case study in Zhongwei-Zhongning Plain Irrigation District

Rongrong Qiao, Haitao Huang, Chunyuan Dong, Lihui Luo, Xueli Chang

表1 农田格局指数（类型面积， CA；平均最邻近欧几里得距离， Enn_mn；最大斑块面积指数， LPI；周长-面积分维数， Pafrac ）分级

Table 1 Grading of pattern factors in farmland

指数 级别 分级范围 指数 级别 分级范围 CA/hm2 Ⅰ 0~254 LPI/% Ⅰ 0~25 Ⅱ 254~474 Ⅱ 25~46 Ⅲ 474~631 Ⅲ 46~65 Ⅳ 631~771 Ⅳ 65~83 Ⅴ 771~918 Ⅴ 83~100 Enn_mn/m Ⅰ 0~67 Pafrac Ⅰ 0.000~0.124 Ⅱ 67~188 Ⅱ 0.124~0.412 Ⅲ 188~401 Ⅲ 0.412~0.750 Ⅳ 401~801 Ⅳ 0.750~1.060 Ⅴ 801~1 931 Ⅴ 1.060~1.497