地层岩性对植物群落分布特征的影响

The effects of lithology on the plant community distribution characteristics

地层岩性是生态地质环境条件的重要组成部分,查明不同岩性对生长在其上植物群落的影响,对生态保护和生态修复具有重要意义。以江西赣州市相同地貌条件和气候条件下的岩石、土壤、植物群落为研究对象,通过对植被和土壤开展全面调查与采样分析,探索了岩石-土壤-植物群落间的对应关系。分析了不同成土母岩衍生的土壤在粒度组成、化学成分、物理性质等方面的特征,揭示了地质背景条件与植物群落分布的关系。结果表明①成土母岩岩性、土壤质地、土壤pH值、土壤养分、土壤中主量和微量元素含量的差异是影响植物群落分布的重要因素;②研究区各岩性区的土壤养分含量从高到低为变余杂砂岩区土壤>粉砂岩区土壤>砂砾岩区土壤>长石石英砂岩区土壤>花岗岩区土壤。

Lithology is an important part of ecogeological environment conditions,and it is of great significance for ecological protection and restoration to identify the effects of different lithology on plant community.Taking the rocks,soil and plant community under same landform and climatic condition as research objects,the authors in this paper conducted comprehensive investigation and analysis of plants and soil to explore the corresponding relationship among rocks-soil-plant community.The relationship between geological background conditions and plant community distribution was obtained mainly from the particle distribution size composition,chemical composition and physical properties of soils derived from different parent rocks.The results shows:①The parent rock lithology,soil texture,soil pH,and soil nutrients,and the major and trace elements are important factors to affect the distribution of plant community;②The richness of soil nutrients in different lithological areas is ranked according to that in greywacke area>siltstone area>sandy conglomerates area>feldspathic quartz sandstone area>granite area.