作　　者： ; ; ; ;

机构地区： 华中农业大学园艺林学学院园艺植物生物学教育部重点实验室

出　　处： 《应用生态学报》 2013年第3期801-808,共8页

摘　　要： 以丹江口水库消落带为研究区域,利用层次聚类法将海拔140～145m区域内37个样地的土壤种子库分为6个组,比较不同组间的种子库物种组成、密度及多样性指数之间的差异;利用相似性指数分析土壤种子库与地上植被的差异;运用主成分分析和多元回归分析土壤种子库密度与地上植被、环境因素的关系.结果表明:在丹江口水库消落带同海拔区域内,土壤种子库在物种组成上呈明显的异质性,不同组间的种子库密度、多样性指数均存在显著差异;土壤种子库与地上植被的差异较大,而且土壤种子库中的物种数明显少于地上植被中的物种数;土壤种子库密度与地上植被盖度、地上物种数和土壤质地呈显著正相关,而与田间持水量和土壤孔隙度呈显著负相关. Taking the water level fluctuating zone of the Danjiangkou Reservoir as a case, and by the method of hierarchical cluster analysis, the soil seed banks at 37 sampling plots within the areas of 140-145 m elevation we.re divided into 6 groups, and the species composition, density, and di- versity of the soil seed banks among the groups were compared. The differences between the soil seed banks and the aboveground vegetations were analyzed by Scrensen similarity coefficient, and the correlations among the soil seed banks, aboveground vegetations, and environmental factors were explored by principal component analysis （PCA） and muhivariable regression analysis. At the same altitudes of the water level fluctuating zone, the species composition of the soil seed banks had obvious heterogeneity, and the density and diversity indices of the soil seed banks among different groups were great. The similarity coefficient between the soil seed banks and aboveground vegeta- tions was low, and the species number in the soil seed banks was obviously lesser than that in the aboveground vegetations. The density of the soil seed banks was highly positively correlated with the aboveground vegetations coverage and species number and the soil texture, but highly negatively correlated with the soil water-holding capacity and soil porosity.

关 键 词： 消落带 土壤种子库 物种组成 地上植被 环境因子 丹江口水库

领　　域： [生物学]