人为干扰对金马河温江段护岸林物种多样性和土壤理化性质的影响

Effects of Human Disturbance on Species Diversity and Soil Physical and Chemical Properties of Revetment Forest in Wenjiang Section of the Jinma River

采用典型样地法,运用干扰理论和物种多样性分析方法,使用冗余分析(RDA)研究了11个环境因子与护岸林物种多样性的关系,探究不同强度人为干扰对金马河温江段护岸林物种多样性和土壤理化性质的影响。结果表明:(1)在264个不同层次样方中,记录植物122种,隶属65科102属,其中草本层物种数量最多,种类达89种,占总记录数73%,随人为干扰强度增加物种数量逐渐减少;(2)人为干扰对金马河护岸林群落物种多样性水平产生负面影响,随着干扰强度增加,群落各层次Shannon-Wiener多样性指数(H)和物种丰富度指数(D)逐渐降低,乔木层物种组成单一,造成群落环境功能和稳定性下降;(3)群落土壤p H值呈碱性,土壤有机质含量较高,不同干扰强度下各土壤理化性质具有显著差异(P <0.05);(4)土壤含水量、速效钾、有机质含量是影响护岸林物种多样性的最主要因子。

By the typical plot method,the interference theory and species diversity analysis method,and redundant analysis(RDA),we studied the relationship between 11 environmental factors and the diversity of revetment forest species,and explored the different disturbances of human disturbance to the Wenjiang section of the Jinma River.The impact of species diversity and soil physical and chemical properties on revetment forests.The results showed that:(1)Among the 264 different levels,122 species of plants were recorded,belonging to 65 families and 102 genera,of which the herbaceous layer had the largest number of species,with 89 species,accounting for 73%of the total records,with the increase of human disturbance intensity.The number of species is gradually decreasing;(2)Human disturbance has a negative impact on the species diversity level of the Jinma River revetment community.With the increase of disturbance intensity,the Shannon-Wiener diversity index(H)and species richness index(D)of the community are gradually reduced,and on the arbor layer the species composition is single,resulting in a decline in community environmental function and stability;(3)The pH value of the soil in the community was alkaline,and the soil organic matter content was high.The physical and chemical properties of the soil under different disturbance intensity were significantly different(P<0.05);(4)Soil water content,available potassium and organic matter content are the most important factors affecting the species diversity of revetment forests.