英语语法分析

The value of lacunarity indices is in direct proportion to the degree of sand dune concentration.

结果表明，沙丘的分布形式越集中，沙丘的间隙度指数越大；

With the increase of spatial scale, the lacunarity indices of the seedling populations were decreased.

随着尺度的增大，种群分布格局的间隙度逐渐减小。

A moderate clumping of mobile sand sites where vegetation covers were less than 20% were discovered using lacunarity analysis.

对植被盖度低于20％的流沙斑点或斑块沿样线分布的空隙度分析表明流沙斑点或斑块呈适度聚集的格局。