边坡植被修复后草本群落多样性与土壤因子的耦合关系

Coupling relationship between herbaceous community diversity and soil factors after slope vegetation restoration

为明确边坡不同植被绿化模式下草本植物群落多样性与土壤因子的耦合协调程度,以延安新区18种典型边坡植被绿化模式的林下草本植物群落和土壤为研究对象,每种模式设置5个1 m×1 m的样方对边坡植被修复后的草本植物进行调查,并测定样方内土壤的理化性质,运用灰色关联法构建植被-土壤耦合模型,研究边坡植被修复后草本植物多样性与土壤因子的耦合关系。结果表明:延安新区边坡草本植物种类共有22种,分属12科,其中菊科和禾本科植物最多,均占物种总数的22.73%;草本植物群落多样性指数对土壤作用的反馈程度表现为Shannon-Wiener指数>Margalef指数>Simpson指数>Pielou指数;研究区草本植物群落多样性与土壤因子关联度均为中等及以上关联,其中土壤电导率的关联系数为0.852,与草本群落多样性的关系更紧密;延安新区边坡植被修复后,草本植被与土壤之间的耦合关系整体表现良好,现有绿化模式中已有66.67%的草本植被与土壤耦合关系跨过了不协调阶段,但林下草本植物群落与土壤系统还未达到最佳的协调程度。

To clarify the degree of coupling and coordination between herbaceous plant community diversity and soil factors after slope vegetation restoration,the understory herbaceous plant communities and soils of 18 typical slope vegetation greening models in Yan’an New District were used as research objects.Five 1 m×1 m sample plots were set up in each model and the physical and chemical properties of the soil in the sample plots were measured.The gray correlation method was used to construct a vegetation-soil coupling model to evaluate the coupling relationship between herbaceous plant diversity and soil factors after slope vegetation restoration.The results showed that there were 22 species of herbaceous plants,belonging to 12 families,on the slopes of Yan’an New District.Among them,the families Asteraceae and Poaceae were the most abundant,both accounting for 22.73%of total species number.The degree of feedback of the herbaceous plant community diversity indices to the soil was in the order of Shannon-Wiener>Margalef>Simpson>Pielou indices.The correlation between the herbaceous plant community diversity and soil factors in the study area was moderate or above,of which the correlation coefficient of soil electrical conductivity,which was more closely related to community diversity,was 0.852.Overall,the performance of the coupling relationship between herbaceous plant diversity and soils after slope vegetation restoration in Yan’an New District was good,and 66.67%of existing greening models have already crossed the stage of incongruity in this coupling relationship.However,the understory of herbaceous plant communities and soil systems are yet to reach the optimal coordination level.