林地水土保持功能持续提高的机制及对策

Study on Mechanism and Strategies for Sustainable Development of Soil and Water Conservation Function of Woodland

通过对不同林地水土保持功能分析得出,其发展过程可分为成长期、成熟期和减退期,并定义成熟期为可持续发展期。分析了影响水土保持功能持续提高的环境分配系数r和环境利用系数k,认为r是林地中光、水、肥分配的参数,k为光、水、肥利用的参数。林地水土保持功能的持续提高,应通过调整r和k,即调控林地的树种组成、林分层次和林分密度,形成合理的林分结构,保持成熟期的持续发展。并在此基础上提出了林地水土保持功能持续提高的相应对策。

According to a general rule of a system development which is described as Logistic curve,the developing process of soil and water conservation function of woodland is divided into stages including growing,mature and descending based on the developing speed.The mature stage is defined as the period of sustainable development.The length of the period of sustainable development is influenced by distribution light,water and fertilizer of which distributing coefficient is r and using coefficient is k.Thereby,in oder to raise as the strategies for sustainable development of soil and water conservation function,that the distributing coefficient r and using coefficient k should be adjusted through maipulating composition of tree species in forest,standing hierarchy and standing density to develop rational standing structure,proglong the mature stage,and shorten the growing stage.