[Relationships between landscape structure and rocky desertification in karst region of northwestern Guangxi].
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.
Zhang
Xiao-nan
XN
Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China. zzzxn@163.com
Wang
Ke-lin
KL
Chen
Hong-song
HS
Zhang
Wei
W
D002681:China; D003247:Conservation of Natural Resources; D017753:Ecosystem; D004784:Environmental Monitoring; D006109:Poaceae / Q000254:growth & development; D012987:Soil / Q000032:analysis*; D014197:Trees / Q000254:growth & development*
D012987:Soil