Scale-dependent spatial heterogeneity of vegetation in Mu Us sandy land, a semi-arid area of China
Scale-dependent spatial heterogeneity of vegetation in Mu Us sandy land, a semi-arid area of China
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DOI：
10.1023/a:1020318509972
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发表时间：
2002-09-01
期刊：
影响因子：
1.7
通讯作者：
Dong, M
中科院分区：
文献类型：
--
作者：
Chen, YF;Yu, FH;Dong, M
为了研究毛乌素桑迪植被的空间尺度变化，在毛乌素沙地设置了两条5 km长的样带，并对植被覆盖度和植物种类数两个植被属性（定量描述符）进行了研究。结合地质统计学和分形几何学对数据进行了分析。嵌套的空间结构揭示了两种植被属性，表明存在多尺度变化。植被中普遍存在较大的分维（>1.70），表明小尺度变化占主导地位。检测到分形维数的变化，这意味着尺度依赖的空间变化的植被，以及其层次结构。不同方向的植被属性的空间变化也存在显着差异，表明地貌过程的带状各向异性。
To examine spatial scale-dependent variation in the vegetation in Mu Us sandy land, in the semi-arid area of NW China, two transects (5 km in length, meeting at right angle) were set, and two vegetation attributes (quantitative descriptors), vegetation cover and number of plant species, were investigated. The data were analyzed combining geostatistics and fractal geometry. Nested spatial structures were revealed for both vegetation attributes, indicating the existence of multi-scale variations. The large fractal dimensions (>1.70) commonly found in the vegetation suggest the dominance of small-scale variations. Shifting in fractal dimensions was detected, implying scale-dependent spatial variation of the vegetation, as well as its hierarchical organization. Significant differences in spatial variation of the vegetation attributes between the different directions were also found, suggesting a zonal anisotropy of geomorphologic processes.