广西都安地区5种森林类型土壤机械组成及其肥力比较

Study on soil the physical and chemical characteristics of 5 characteristic forests in Du'an area,Guangxi

研究珠江流域中上游广西都安地区5种典型森林类型土壤基本理化性质,为进一步探讨该区域森林生态系统物质循环、森林植被规划提供基础数据。通过分析不同森林类型之间土壤理化性质,结果表明:珠江流域都安地区5种森林类型土壤机械组成砂粒变幅在3.63%—23.15%;粘粒变幅在11.62%—56.61%;细粉粒变幅在30.07%—54.34%;粗粉粒变幅在1.84%—10.90%。不同森林类型土壤有机碳、全氮、全磷含量随着土层深度的增加而逐渐降低。对各森林类型土壤A层(0—15 cm)减去D层(45—60 cm)化学性质的比较,各森林类型土壤有机碳积累大小顺序为马尾松×荷木混交林>青冈栎林>马尾松林>任豆林>桉树林;土壤全N积累大小顺序为马尾松×荷木混交林>青冈栎林>任豆林>马尾松林>桉树林。综合来看,在都安地区不同森林类型对土壤保育功能提高上,5种森林类型影响大小顺序为马尾松×荷木混交林>青冈栎林>任豆林>马尾松林>桉树林。

The soil basic physicochemical property of5typical forests with different characteristic was researched in Guangxi Du'an region of the Pearl River middle reaches,providing basic data to further explore material circulation of forest ecosystem and planning for forest vegetation in the area.By analyzing soil physical and chemical property between different forests,we found that the sand grain content was3.63%-23.15%;the clay content was11.62%-56.61%;the fine silt content was11.62%-56.61%,the coarse dust was1.84%-10.90%.The soil organic carbon,total nitrogen,total phosphorus content gradually reduced with the increase of soil depth in different forest types.The5different type forests on soil organic carbon accumulation was Pinus massoniana and Schima superba mixed forest>Cyclobalanopsis glauca>Pinus massoniana>Zenia insignis>Eucalyptus,on the total N accumulation was Pinus massoniana and Schima superba mixed forest>Cyclobalanopsis glauca>Zenia insignis>Pinus massoniana>Eucalyptus.The stand of5different type forests in the Pearl river basin on soil conservation improvement as following was:Pinus massoniana and Schima superba mixed forest>Cyclobalanopsis glauca>Zenia insignis>Pinus massoniana>eucalyptus.