Analysis of spatial variability of the fractal dimension of soil particle size in Ammopiptanthus mongolicus’ desert habitat |
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| 出 版 社：Environ Geol |
| 发表时间：DOI 10.1007/s00254-008-1575-7 |
| 台 站：
沙坡头沙漠试验研究站
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| 作 者：贾晓红 |
| 点 击 率：4276 |
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| 关 键 字：Ammopiptanhus mongolicu,Psammophytic vegetation , Fractal dimension of soil |
| 摘 要：Quantitative analyses of soil texture with the
help of the fractal dimensions of soil particle sizes show
that fractal dimensions exhibit a significant linear negative
correlation with the sand content ([0.1 mm) and a significant
power-law positive correlation with the content of
clay and silt (\0.05 mm) (P\0.0001). However, results
revealed that the range of spatial heterogeneity was not
restricted to the range of the shrub canopies of the dominant
Ammopiptanthus mongolicus communities in the
desert region. These results did not support the theory of
the ‘‘fertile island effect’’ arising from the interception of
fine-grained materials including dust by the shrubs in a
desert ecosystem. We hypothesize that the high spatial
heterogeneity existing beyond the scope of the shrub canopies
and the lack of proper soil substrate conditions
required for the invasion of other species, lead to the steady
dominance of A. mongolicus communities in these arid
desert regions.
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