兰州马衔山森林冻土环境演变研究

A Study of Environmental Development of Forest Covered Frozen Soil Region on Mt． Maxian near Lanzhou

本文采用非平衡态热力学理论，研究兰州马衔山深季节冻土区的森林生态系统，从研究森林演替入手得出生态环境演变的规律。森林生态系统的熵变ｄｓ由两部分组成：一部分由系统内的不可逆过程（如生物量改变、生物化学过程等）产生的熵变ｄ＿ｔｓ，另一部分由系统与外界交换物质与能量引起的ｄ＿ａｓ，以此为基础得该区环境演变关系式。

In this paper，a theory of non－equilibrium thermodynamics is applied to the ecologic system offorest in zone of deep seasonal frozen soil on Mt． Maxian. The pattern of ecologic environment evolution is obtained from the studying of forest succession， The entropy change of forest ecologic system consists of two parts， those are d_ts（produced in the system due to irreversible proeesses such as change of plant quantity， biochemical activity，etc）and d_gs（pro- duced due to exchange of material and energy between the system and its environment），based on which the environmental development in the region is formulated.