毛竹林紫色土壤主要水源涵养指标和地形要素及植物多样性指数的关系

The Influences of Landform and Plant Diversity on the Soil Water Conservation of Moso Bamboo Forest

在贵州省赤水河下游研究了毛竹林紫色土壤主要水源涵养指标和地形要素及植物多样性指数的变化规律及相关性。结果表明:1不同类型毛竹林乔木层植物部分结构指标及植物多样性指数值差异显著、灌木层植物部分多样性指数值差异显著,乔木、灌木与草本层植物结构指标值及植物多样性指数值互为消长。2不同类型毛竹林土壤相同土层的主要水源涵养指标值差异不显著,相同类型不同土层的部分水源涵养指标值差异显著。土壤主要水源涵养指标值和海拔高度的正相关及坡度的负相关显著、乔木层植物部分多样性指数的负相关显著、灌木层及草本层植物部分多样性指数的正相关显著。3毛竹林植物多样性指数和土壤主要水源涵养指标的相关性中,仅直线型相关显著的指标对数量占9.92%、仅二次多项式相关显著的指标对数量占21.03%、相关不显著的指标对数量占69.05%,相关显著的指标对数量存在植被层片和土壤层次的分异性以及指标类型的差异性。

This paper studied the influences of landform and plant diversity on the soil water conservation of Moso bamboo forest in the lower reaches of Chishui River,Guizhou province.The results showed that between various types of Moso bamboo forests,the structural parameters and plant diversity indexes of the trees were significantly different,and the plant diversity indexes of the shrubs was significantly different. There showed a trade-off in the values of structural parameters and plant diversity indexes between the trees,shrubs and herbs. The values of soil water conservation indicators of the same soil layer between different types of Moso bamboo forests were not significantly different,but that of the different soil layers in the same Moso bamboo forest type were significantly different. The values of soil water conservation indicators were positively correlated to the elevation,plant diversities of shrubs and herbs,while negatively correlated to the slope,and plant diversity of trees. Among the correlation coefficients between the soil water conservation and plant diversity of the Moso bamboo forests,9. 92% of them were linearly significant, 21. 03% of them were quadratic-polynomial significant,the other 69. 05% of them were not significant.