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作 者 ：张笑楠^1,2,3;王克林^1,2;陈洪松^1,2;张伟^1,2

期 刊 ：应用生态学报 2008年 19卷 11期 页码：2467-2472

摘 要 ：

采用典范对应分析方法（CCA），从景观类型和景观两个层次选取了16个景观格局指数来表征景观结构特征，分析了广西省环江县喀斯特区域的景观结构与石漠化强度的关系.结果表明，平均斑块面积、平均旱地斑块面积、景观形状指数和聚集度指数与CCA排序的前两个排序轴相关性强，对区域石漠化过程具有重要影响.研究区潜在石漠化主要与平均旱地斑块面积、平均旱地斑块分维数和平均灌木林地斑块分维数呈较强的正相关，与旱地斑块数呈负相关;轻度石漠化与分维数、平均未利用地斑块分维数和灌木林地斑块数的正相关性较强;中度石漠化和重度石漠化主要与平均未利用地斑块面积呈正相关、与平均灌木林地斑块分维数呈负相关，说明景观结构特征对土地石漠化程度具有一定的指示意义.排序分析结果较清晰地解释了研究区石漠化程度沿景观结构特征梯度的变化规律.

Abstract:By using canonical correspondence analysis (CCA), sixteen landscape indices were adopted to quantitatively analyze the relationships between the landscape structure and rocky desertification in karst region of Huanjiang County, Guangxi Province. The results showed that the first and the second ordination axis of CCA were strongly correlated to the factors of average patch area, average dry land patch area, landscape shape index, and landscape aggregation index. The potential rocky desertification in the region was highly positively correlated with the average dry land patch area and the average fractal dimensions of dry land and shrub land, but negatively correlated with the patch numbers of dry land. Light rocky desertification had obvious positive correlations with the fractal dimension index, average fractal dimension of unused land, and patch numbers of shrub land; while moderate and strong rocky desertification had high positive correlations with the average unused land patch area but negative correlation with the average fractal dimension of shrub land. To some extent, rocky desertification degree might be represented by the values of landscape indices. The gradient variation in karst rocky desertification along landscape structure was clearly presented by the results of CCA.

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