The land resources utilizing system is such a big and complicated system concerning with society, economy and ecology that we can not efficiently resolve this problem by traditional methods.
土地资源利用系统是一个复杂而巨大的社会、经济和生态系统，传统的定性与定量方法难以有效地解决土地资源利用系统的问题。
Mountainous small watershed is a natural catchments as well as a complex system out of the sub-system of ecology, economy and society.
山区小流域是以分水岭和出口断面为界形成的自然集水单元，是具有一定水文学特征的自然、社会和经济综合体。
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