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。
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.
本文以热力学定律为依据，根据农业生态系统的特性，给农业生态系统的熵下了定义。
According to the thermodynamic law and the characteristics of agricultural ecological system, the entropy of agricultural ecological system was defined.
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