山地-绿洲-荒漠系统耦合关系研究的新进展

依托西部干旱区自然地理背景，提出了山地-绿洲-荒漠系统（MODS）耦合关系的概念及原理，分析了典型MODS的时空特征与动态变化，以及三者之间的物质循环、能量转化和信息传递的过程，阐述了MODS相互作用及协调共生机制。地貌类型与气候特征决定耦合类型的基础和框架，水文特征决定耦合类型的空间格局，植被类型反映耦合类型的外貌，土壤状况制约耦合类型的功能，人为活动影响耦合类型的演变过程。MODS界面过程与水分、土壤、空气等介质密切相关，而水是自然界物质循环和能量转化以及信息传递的主要媒介。以水为核心的水盐、水热以及水土关系的紊乱，制约了水域生态系统的稳定性。

THE NEW ADVANCES OF MOUNTAIN-OASIS-DESERT SYSTEM COUPLING RELATION

The concept and principles of mountain-oasis-desert system (MODS) are put forward based on the natural geographical background in arid zone, western China in this paper. The spatio-temporal characteristics and dynamic change of typical MODS, the process of material circulation, energy transform and information transmission among MODS and the mechanism of MODS interaction and symbiosis are analyzed. The foundation and frame of the coupling type are determined by landform types and climate characteristics; the spatial pattern of the coupling type is determined by the hydrological characteristics; the vegetation type reflects the appearance of the coupling type; the soil state restricts the function of the coupling type and the human activities influence the development course of the coupling type. Interface course of MODS is closely related to such medium as water, soil, air, etc., and water is the main media during the course of material circulation, energy transform and information transmission. The disorder of water-salt, water-heat and water-land restricts the stability of water ecosystem.