耗散结构理论在我国北方农牧交错带人地系统分析中的应用

在分析了耗散结构形成的条件基础上,首先对我国北方农牧交错带人地系统进行了状态识别,指出:北方农牧交错带的大部分人地系统处于低序的耗散结构状态,有些地区的人地系统已退化到近平衡态线性区;沙漠化的成因是系统封闭和自组织混乱;点状治理有其自身的局限性;沙漠化的逆转也应遵循系统演化的分支理论。最后,指出我国北方农牧交错带的人地系统具有脆弱性、低耗散性和功能性的特点。

Applying Dissipative Structure Theory to Analyze Man-land System in Transitional Zone of Pastures and Farmlands in North China

Based on the analysis condition of dissipative structure,the state of man land system of inter locked zone of pastures and farmlands of north China has been identified.The conclusions are that most of the human land systems are in low order structure,some even have been degenerated to the range of linearity.From the point of the dissipative structure theory,the causes of desertification are insulation of the system and chaos of self organization.And the spot recondition has its own limitation,the recovery of the land follows the principle of embranchment evolvement.Finally,the characteristics of dissipative structure of human land system have been analyzed,which are fragile,low dissipative,and functionary.