石漠化坡地生态修复过程中棱角山矾幼树生长的环境响应

Environmental response of Symplocos tetragona young trees growth in the process of ecological restoration of rocky desertification slope

以石漠化坡地中的棱角山矾幼树为研究对象,采用Pearson相关分析、冗余分析、变差分析等研究方法探索了在石漠化坡地生态修复过程中棱角山矾幼树生长的环境响应,以期为棱角山矾在石漠化区域的科学栽植、抚育管理提供理论依据。结果表明:(1)Pearson相关分析、冗余分析的结果一致表明,海拔、坡度、坡位、土壤厚度是影响棱角山矾幼树生长的重要的环境因子。(2)通过基质覆盖和客土可以改变土壤的理化性质,增加土壤孔隙度,减少土壤容重,进而促进植被生长,提高生态修复的效率。(3)地形因素对土壤因子的分配影响作用较弱,土壤肥力的提升主要得益于基质客土、基质覆盖及茅草混合覆盖等组合覆盖方式对土壤的改良作用。

Taking Symplocos tetragona young trees in the rocky desertification slope as the research object,the environmental response of young trees in the process of ecological restoration of rocky desertification slope was explored using Pearson correlation analysis,redundancy analysis,variation analysis and other research methods,in order to provide a theoretical basis for scientific planting,tending and management of S.tetragona in the rocky desertification area.The results showed that:(1)The results of Pearson correlation analysis and redundancy analysis showed that altitude,slope,slope position and soil thickness were important environmental factors affecting the growth of young trees of S.tetragona.(2)The physical and chemical properties of soil could be changed through substrate covering and exotic soil,the soil porosity could be increased,the soil bulk density could be reduced,and then the vegetation growth could be promoted,and the efficiency of ecological restoration could be improved.(3)Topographic factors had a weak influence on the distribution of soil factors,and the improvement of soil fertility ismainly due to the improvement of combined mulching methods such as substrate soil,substrate mulching and straw mixed mulching.