黄河三角洲海岸带陆海相互作用概念模式

根据陆海相互作用的观点,黄河流域、黄河干流、河口三角洲及其邻近海区的生态环境相互联系,组成了一个有机的生态系统链,可称为黄河-渤海生态系统。黄河流域的降水量、土壤植被条件使黄河干流具有水少沙多、水沙异源和水资源缺乏的特征。干流入海水、沙通量变化影响了黄河三角洲地区的侵蚀、堆积和发育过程。黄河物质入海后在河口及邻近海域形成了具有高生产力的生态环境和著名的渔场。据此绘出了黄河-渤海生态环境内各环节相互联系的概念模式图,并提出了黄河流域大面积水土保持和南水北调工程逐步展开等新环境下,本区陆海相互作用的研究方向。

CONCEPTION MODEL OF LAND OCEAN INTERACTION IN THE COAST ZONE OF THE YELLOW RIVER DELTA

Based on the view of global change and land ocean interaction in the coast zone, the Huanghe River basin,the Huanghe River,its estuary and the Bohai Sea (main in the southern part) form of a large ecosystem, in which they have a close relation with each other. We call it the Huanghe river-Bohai Sea ecosystem. In this large ecosystem, atmospheric circulation and some astronomy factors cause changes on climate in the Huanghe River basin; climate and geomorphologic characteristics and human activities control the fluxes of water and sand and nutrients emptied to the sea. After entering into the sea, these matters are transported by the Bohai and Huanghai Sea's circulation system and form fishing fields with high production in suitable areas. In addition, many marine dynamic factors changed coastal form and submarine relief, and even impacted the climate and geomorphologic characteristics in the Huanghe basin through atmospheric circulation. There are many factors in this large ecosystem, one of whose change will lead to the changes of others and even result in destroy of all ecosystems. Therefore, the influence of all factors on marine ecological environment in the harness and plan in the river basin, or in the river main course and in its estuary should be fully considered. Meanwhile, the fluxes of water, sand and nutrients emptied to the sea in the protection of marine ecological environment and in their recovery processes should be controlled scientifically. In this large ecosystem, if the two parts of land and ocean contact closely and promote each other, theecosystem will develop continuously along favorable circle.