Yuan Tie-Xiang, Zhang He-Ping, Ou Zhi-Yang, Tan Yi-Bo
Ying Yong Sheng Tai Xue Bao. 2014 Oct;25(10):2803-10.
Covariance analysis, curve-fitting, and canonical correspondence analysis (CCA) were used to explore the effects of topographic factors on the plant diversity and distribution patterns of ground flora with different growth forms in the karst mountains of Southwest Guangxi, China. A total of 152 ground plants were recorded. Among them, 37 species were ferns, 44 species herbs, 9 species lianas, and 62 species shrubs. Covariance analysis revealed that altitude significantly correlated with the individual number and richness of ground plants, and slope aspect had a significant effect on richness. Statistical analyses showed a highly significant nonlinear correlation between the individual number or richness of ground plants and altitude. Results of CCA revealed that slope aspect had a significant effect on the distribution pattern of ferns, and slope had a significant effect on the distribution patterns of herbs, lianas and shrubs. Ferns were more sensitive than herbs, lianas and shrubs to changes in heat and soil water caused by aspect. The effect of slope was stronger than that of elevation on soil water and nutrients, and it was the most important topographic factor that affected the distribution patterns of herbs, lianas and shrubs in this region.
采用协方差分析、曲线拟合和典范对应分析（CCA），探讨广西西南部喀斯特山区地形因子对不同生长型地被植物多样性及分布格局的影响。共记录到152种地被植物。其中，蕨类植物37种，草本植物44种，藤本植物9种，灌木62种。协方差分析表明，海拔与地被植物的个体数量和丰富度显著相关，坡向对丰富度有显著影响。统计分析表明，地被植物的个体数量或丰富度与海拔之间存在极显著的非线性关系。CCA结果表明，坡向对蕨类植物的分布格局有显著影响，坡度对草本植物、藤本植物和灌木的分布格局有显著影响。蕨类比草本植物、藤本植物和灌木对坡向引起的热量和土壤水分变化更敏感。坡度对土壤水分和养分的影响比海拔更强，是影响该地区草本植物、藤本植物和灌木分布格局的最重要地形因子。
