朔州市小叶杨防护林带间植被多样性与土壤理化性质的相关性分析

Correlation between Vegetation Diversity and Soil Physical and Chemical Properties in Poplar Shelterbelt in Shuozhou

以朔州市作为试验研究地点,分析小叶杨防护林带间植被多样性和土壤理化性质相关性。方法于小叶杨防护林划分3组不同带间距,分别为5 m、10 m和15 m带间距,测定其不同带间距植被多样性和其土壤理化性质,分析二者相关性。结果:①植被多样性:带间距大小对小叶杨防护林植被多样性有显著影响,植被天然状态下,植被多样性、群落稳定性表现为15 m带间距>10 m>5 m(P<0.05);②土壤理化性质:随着带间距的增加,土壤理化性质(有机碳、全氮、速效磷和速效钾)表现为15 m>10 m>5 m(P<0.05),而土壤容重与其相反,表现为15 m<10 m<5 m(P<0.05);③相关性:植被多样性与土壤理化性质为相辅相成的关系,其中土壤容重与物种多样性指数呈显著负相关,有机碳、全氮、速效磷土壤理化性质与物种多样性指数呈显著正相关,速效磷相关性不显著。经试验研究结果表明,在小叶杨防护林中,适当增加防护林带间距有助于提升植被多样性,增强群落稳定性,改良土壤理化性质,以15 m效果最佳。

To analyze the correlation between vegetation diversity and soil physical and chemical properties.Methods The spacing of 5m,10m,and 15m.Results:①Vegetation diversity:the size of belt spacing has a significant impact on the vegetation diversity of leaflet poplar shelterbelt,In the natural state of the vegetation,Vegetation diversity and community stability showed 15m band spacing>10m>5m(P<0.05);②Soil physical and chemical properties:with the increase of band spacing,Soil physicochemical properties(organic carbon,total nitrogen,SAP and potassium)were 15m>10m>5m(P<0.05),The soil capacity weight is the opposite,The performance was 15m<10m<5m(P<0.05);③Correlation:Vegetation diversity and soil physical and chemical properties are mutually reinforcing.Soil bulk density is significantly negatively correlated with species diversity index,while soil physical and chemical properties of organic carbon,total nitrogen and available phosphorus are significantly positively correlated with species diversity index,while available phosphorus is not significantly correlated.The experimental results show that in the leaflet shelterbelt,appropriately increasing the spacing of the shelterbelt is helpful to improve the vegetation diversity,enhance the community stability,and improve the soil physical and chemical properties,with the best effect of 15 m.