Research On Coupled Model Of Groundwater Balance And Ecological Succession

As a cross-century topic, the shortage of water resources has come to the fore in many countries. The development of many areas is bothered by a series of problems related to shortage of water resources, such as ecological deterioration, vegetation degradation, excessive dry of farmland, abusive exploitation and usage of underground water and the bad effect on agricultural industry, etc. As the important factor of ecological system, the change and succession of vegetation are of importance to the improvement of ecological environment. As the subsystem in the main system of ecological cycle succession, the vegetation ecological system is the direct token of such characteristics as regional water resources distribution pattern, water quality, soil moisture, regional climate and hydrology. It indicates the characteristics and state of hydrogeology. The spatial pattern of the succession and development of vegetarian ecological system, especially in dry area is influenced by both the natural elements of inorganic environment and the manmade elements of social economy. Due to the dry weather and scarceness of rain, the succession of vegetation in dry areas is intimidated and controlled by the time and spatial distribution patterns of water resources, especially underground water. It succession process has certain coupling relationships with the dynamic state and each feature of underground water. The analysis of ecological succession and the major dominating factor of underground water dynamic state is of great significance to the grasp of the characteristics of ecological landscape and ecological recovery. It can also provide help and guide to the ecological protection of Shule River basin.As an important commodity grain base in northwest area, Shule River basin enjoys a very important place. The research of the ecological environment governance in Shule River basin is of importance to the development of northwest area and the resolution to the problems of China's ecological environment. Due to the draught and scarce rain and strong sunlight the ecological system is extremely vulnerable and the succession of vegetation ecology is long intimidated by environment. In this condition, underground water resources become the key factor of vegetation succession. Both the moisture intimidation of inorganic environment and the interference of regional economical development and human activities become the key factors of regional ecological landscape pattern.Based on the monitoring data from the underground water long observing wells in Shule River basin from 2000-2009 and using Kriging interpolation method, this paper performs numerical simulation to the burial depth of the underground water in Shule River basin and generates the curved surface of underground water spatial distribution and analyzes the characteristics of Shule River basin hydrology and vegetation distribution elements. This paper does monitoring classification in ERDAS 8.4 system by using 2006 Shule River panoramic view video data and land usage data. It analyses the distribution situation of vegetation landscape pattern by extracting the index of vegetation landscape pattern characteristics, combining the corresponding underground water distribution pattern in vegetation physical period and using the Fractal Theory. It also studies the coupled relation between the fractal dimension of vegetation landscape pattern and the distribution of underground water and sets up the spatial relation model of vegetation succession and moisture intimidation. In addition, it inspects and verifies the coupled model by using 1:1000000 large scale normalization vegetation index (NDVI) video data.In combination with the current situation of Shule River basin and on the basis of landscape ecology theory, this paper studies the cause of formation and characteristics of landscape pattern in Project area. It also analyses the characteristics of the landscape pattern succession of Shule River in the hope of providing theoretical support of the ecological succession and recovery of Shule River.The research of Shule River basin ecological landscape is of great significance to the improvement of ecological environment and regional economy development in northwest dry areas and social stability. The agricultural production in the river basin is totally dependent on artificial irrigation because of draught. The first priority of water resources development and exploitation is long put on agricultural industry and the available yield of surface runoff is used as ecological water whereas the most important ecological need of water is put on the second place. The short-term benefits of the natural resources exploitation by agricultural and industrial production are to satisfy the need of people's daily life and economical development; the long-term benefits are to improve the living environment and living quality of people. But the excessive exploitation of water resources interferes with the ecological succession, destroys the living environment. They focus only on the short-term benefits but neglect the long-term goal. Through the analysis of landscape dynamic pattern process, this paper hopes to change the concept of river basin water usage and build a harmonious and unified Hosi Corridor where the exploitation of water resources serves the ecological protection, all economical behavior and social activities start with the ecological protection so that to change the dry, barren and poor desert.