典型岩溶石漠化区根系生境及其类型研究

Study on root habitat and typesin typical karst rocky desertification areas

在贵州岩溶石漠化区,根据碳酸盐岩分布、地貌类型及岩石类型分布情况,共计调查152个根系生境剖面,利用岩性、产状、根系分布范围内的岩石斑块数、土层深度、裂缝宽度、垂直剖面土壤分布范围、植物根系分布的长宽幅度等指标,采用RDA排序方法,分析根系生长空间类型及其特征;采用定性和定量分析相结合的方法进行快速聚类,划分植物根系生境类型,并进行生境类型命名及类型特征描述。结果表明:1)石漠化区植物根系生长空间分为表层空间、单层空间、多层空间3种类型,植物根系对多层空间类型利用最多;2)贵州岩溶石漠化区根系生境分为18个类型,各类型特征不同。研究成果加深了对岩溶石漠化区植物根系生境的认识,对植物生态修复与石漠化治理均具有重要的意义。

In the rocky desertification area of Guizhou Province,according to the distribution of carbonate rock,landform and rock types,a total of 152 root habitat profiles were surveyed.On the basis of rock type,occurrence,the number of patches of rock lithology within the range of root distribution,soil depth,crack width,vertical range of soil distribution,length and width of the root distribution,the types and characteristics of root growth space were analyzed by using RDA sorting method;Using a combination of qualitative and quantitative analysis method,a fast clustering was conducted,plant root habitat types were classified and named,feature of habitat types was described.The results showed that： 1） the plant root growth space in rocky desertification areas was divided into surface space,single-layer space,multilayer space;on multilayer space was used mostly plant root;2） Root habitat of Guizhou karst rocky desertification area was divided into 18 types,features of various types of root habitat were different.Results of this study deepen the understanding of the habitats of plant root in Karst rocky desertification area.It is of great significance for the ecological restoration and rocky desertification control.