银合欢对元谋干热河谷冲沟治理的机理研究

Mechanism Research of Gully Controlling with Leucaena leucocephala in the Yuanmou Arid Hot Valley

冲沟是生态系统严重退化的产物,在金沙江流域元谋干热河谷发育的冲沟,溯源侵蚀速度为50cm/a,最大达200cm/a。冲沟植被恢复困难,选择银合欢对其进行植被恢复,取得明显的效果,该文从银合欢的生态适宜性机理、银合欢的水分养分循环机理和银合欢的种群结构形成机理3方面研究银合欢对冲沟植被恢复的机理,目的是探明冲沟治理的物种选择方向以及银合欢在生态治理的作用机制与推广价值,这将为同类地区的冲沟治理提供一定的理论依据。

Gully was formed when land was dramatically degenerated in arid valley.In the Yuanmou arid hot valley of Jinsha River,the speed of headward erosion was 50 cm/a to developed gully,and the maximum speed reached 200 cm/a,which was difficult about vegetation restoration.So choosed Leucaena leucocephala to harness gully and achieved significant results.This paper researched the mechanisms of vegetation restoration with Leucaena leucocephala to gully controlling from ecological adaptability,water and nutrient cycling,population structure formation.The purposes were that verifted the direction of species selection to gully controlling and Leucaena leucocephala’s ecological mechanism and values to provide a theoretical basis of gully governance for similar region of aridhot valley.