山羊对各种植物的选择性指数随放牧季节和放牧率的不同而发生变化。
The selectivity index of different plant species changes with grazing The selectivity index of different plant species changes with grazing seasons and stocking rate.
介绍分析了各种植被指数，利用非线性比自动提取植被信息。
Then the paper introduces vegetation indexes and extracts automatically the vegetation information through non-linear ratio.
沙区产业结构单一，种植业多样化指数在1.5—1.8之间；
Simple production structure with planting diversity index from 1.5 to 1.8;
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