祁连山东段不同高寒灌丛草地土壤性状特征变化

Soil Properties of Different Alpine Shrub Grasslands in Eastern Qilian Mountains

为探讨祁连山东段不同高寒灌丛草地土壤性状的变化,在该区内选取了金露梅(Porentilla fruticosa)、柳(Salix)和杜鹃(Rhododendron)3类高寒灌丛草地,研究了不同高寒灌丛草地土壤物理和化学性状特征变化。结果表明:高寒灌丛草地土壤理化性状差异显著。土壤含水量表现为杜鹃灌丛草地>柳灌丛草地>金露梅灌丛草地;容重表现为金露梅灌丛草地>柳灌丛草地>杜鹃灌丛草地;总孔隙度表现为柳灌丛草地>杜鹃灌丛草地>金露梅灌丛草地;杜鹃灌丛草地土壤有机质含量最高为127.638 g·kg^-1,金露梅灌丛草地最低为89.954 g·kg^-1;土壤全P、全K和速效N,P,K含量均表现为杜鹃灌丛草地>柳灌丛草地>金露梅灌丛草地,土壤全N含量金露梅灌丛草地最大为2.912 g·kg^-1,杜鹃灌丛草地最小为2.586 g·kg^-1。相关性分析表明,3类高寒灌丛草地的土壤性状的各个因子之间有显著的相关关系。

For lasting development of the local ecosystem environment.The mainly objective of this study reported was focused on the effect of different shrub grasslands on the soil properties of alpine areas in eastern Qilian Mountains.Three alpine shrub grasslands were selected in the experimental area,including Potentilla fruticosa shrub grassland,Salix shrub grassland and Rhododendron shrub grassland.The resuits showed that different shrub grasslands had significantly different effects on the soil properties of the alpine region.The soil water contents of tested grasslands were ordered as Rhododendron shrub grassland 〉Salix shrub grassland〉Potentilla fruticosa shrub grassland,the order of bulk density was Potentilla fruticosa shrub grassland〉Salix shrub grassland〉Rhododendron shrub grassland,and the total porosity was Salix shrub grassland〉Rhododendron shrub grassland〉Potentilla fruticosa shrub grassland.The organic matter content of Rhododendron shrub grassland was 127.638 g · kg-1,significantly higher than that of other alpine shrub grasslands （P〈0.05） and that of Potentilla fruticosa shrub grassland was 89.954 g · kg-1,which was significantly lower than other patterns （P〈0.05）.Potentilla fruticosa shrub grassland had the largest soil total N content （2.912 g · kg-1）,while Rhododendron shrub grassland had the smallest one （2.586 g · kg-1）.Correlation analysis indicated that there was a significant correlation among the factors of soil properties.