钱塘江流域森林群落物种多样性与土壤因子的关系

Relationship between Plant Species Diversity and Soil Factors in the Forest of Qiantangjiang River Basin

对钱塘江流域不同林分的4个物种多样性指数和9个土壤指标进行回归分析。结果表明:全磷、速效钾与乔木层各指数有显著负相关关系(P<0.05),有效磷与乔木层Simpson指数有显著负相关关系(P<0.05),水解性氮与草本层Shannon-Wiener指数、Gleason指数有显著正相关关系(P<0.05),速效钾与草本层Gleason指数有显著正相关关系(P<0.05);逐步回归分析表明,土壤全磷、速效钾对钱塘江流域植被物种多样性影响较大。

Regression analysis was used to study the relationships between 4 diversity indexes and 9 soil factors in the forest of Qiantangjiang River Basin. Results indicated that total phosphates, available potassium had significant negative correlation with 4 diversity indexes of the arbor layer （P〈0.05）, as well as the available phosphates with Simpson Index of the arbor layer （P〈0.05）. Hydrolysable nitrogen had evident positive relation with Shannon-Wiener Index and Gleason Index of the herb layer （P〈0.05）, as well as available potassium with Gleason Index of the herb layer （P〈0.05）. Stepwise regression analysis showed that total phosphates and available potassium had great impact on species diversity in the Qiantangjiang River basin.