Rearch On Ecological Restoration Area And Patterns Of Ecology Restoration In The Upper Reaches Of The Minjiang River

Minjiang River is one of the important tributaries of the upper Yangtze River. The upper reaches of Minjiang River are located in mountainous valley terrain, and hav big relative height (1500-3000meters). Its ecological environment is very vulnerable. Besides with human over-exploitation, the whole Ecosystem in this area has been severely degenerated, which is a serious threat to the ecological security, social stability in this national region, and is also the threat to the ecological environment construction and the regional sustainable development of the upper Yangtze River. Consequently, it is imminent to research ecological restoration and ensure the achievement of strategies for ecological barrier construction and new rural construction. However, the core of the ecological restoration is to build the systematic, sustainability patterns of Ecology restoration, whose structures and functions are attuned to each other.This study emphasizes the systemic of the ecological restoration, follows the sustainable development of ecosystem and economy, breaks through the conventional ecological restoration without considering regional economic development. This paper combines industry structure with local ecology protection, carries out ecological restoration areas with sustainable development, discusses comprehensive ecological restoration patterns suitable for different regions, so as to achieve multiple purposes of ecological restoration, economic development and Harmonious development of ecological and economic. The main conclusions are as follows:1. The upper reaches of Minjiang River is located in mountainous valley terrain, and has big relative height (1500-3000meters) and significant vertical zones reflected in the vertical changes of heat and water. Both the temperature and the accumulated temperature are negatively correlated with altitude while solar radiation is positively correlated with altitude. The amount of precipitation is positively correlated with altitude within a certain height (3300m), while negatively correlated with altitude above 3300meters as a whole; however, it shows abnormal areas of low rainfall with only 400-600mm, which is 50% of the rainfall in the area less than 1300meters. Meanwhile the amount of evaporation and drying extent in this area are high, and all of these show characteristics of dry valley.2. The upper reaches of Minjiang River are divided into four ecological restoration areas based on regional differentiation, characteristics of regional environmental elements, the function of ecosystem services, industrial development directions and industrial structures. They are the alpine area, the subalpine area, the middle part of the mountains, and valley area (the dry valley, warm and humid valley). It also analyzes the characteristics of ecological environment of each region, major industrial development directions and industrial patterns, which lay the foundations for discussing ecological restoration pattern3. This research studies the land use characteristics and the dynamic changes, taking the land utilization changes as link. The results show that:positive and negative eco-efficiency caused by land use changes co-exists. But, the negative eco-efficiency is greater than the positive eco-efficiency. The decrease of eco-efficiency mainly comes from the increase of farmland and medium coverage grassland, the decrease of forest land and high coverage grassland. It indicates that the development of the area is greater than the input, and the ecosystem is in a degraded state. By analyzing eco-efficiency changes, the scientific basis is provided for the ecological restoration and sustainable development in the upper reaches of the Minjiang River. 4. Based on the above analysis, the environment-friendly-oriented industrial structures with rational regional distribution and sustainable developing strategies are recommended.