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作 者 ：林武星,叶功富,谭芳林,聂 森,徐俊森.

期 刊 ：中国生态农业学报 2008年 16卷 6期 页码：1352-1357

关键词：沙岸；木麻黄；防护林；更新模式；分形维数；土壤结构；土壤理化性质；

Keywords:Sandy coast, Casuarina equisetifolia, Protection forest, Regeneration pattern, Fractal dimension, Soil structure, Soil physical and chemical property,

摘 要 ：运用分形模型对滨海沙地木麻黄防护林10种更新模式土壤结构进行研究，探讨了分形维数与土壤肥力的关系。结果表明，沙质土壤小径级沙粒含量越大，土壤结构分形维数越大，土壤肥力越高，保水能力越强。土壤结构分形维数与土壤小径级颗粒含量及其他理化性质指标均存在显著回归关系。木麻黄、刚果12^#桉、厚荚相思和湿地松顺序排列多行混交模式土壤结构分形维数最大，其改土效果最明显，为最优更新模式。分形模型在沙质土壤肥力研究上应用为木麻黄防护林更新模式选择提供了新思路。

Abstract:Fractal model was used to study soil structure of ten regeneration patterns of Casuarina equisetifolia protection forest in coastal sandy soils to determine the relation between fractal dimension and soil fertility. The results indicate that the higher the finer sand content, the more fractal dimensions exist in the soil structure, and, the better the fertility and water storage ability of the soil. There are obvious regression relations between fractal dimension, soil structure and finer sand content of the soil as well as other soil physical and chemical properties. Fractal dimension of soil structure in multi row mixing pattern, in which C. equisetifolia, Acacia crassicarpa, Pinus elliottii and Eucalyptus 12 ABL are orderly located, is highest. The pattern most obviously improves soil fertility. The application of fractal dimension on sandy soil fertility provides a new way for regeneration pattern selection of C.equisetifolia protection forest.

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