Study On Ecology Benefit Of Land Arrangements Based On The Method Of Emergy Analysis

Land is the most essential means of livelihood and production for human existence and development. With the development of economy and the accelerate process of urbanization, farmland, the important production material, is sharply decreasing as a result of human's continuous nibble. In order to realize strategic goal of the farmland total dynamic balance and ensure grain safety of China, land arrangement has gradually become one of important means of land protection.In recent years, the wide implementation of land arrangement has made a big achievement in the whole country. It has not only increased the effective farmland area and guaranteed the farmland total dynamic balance, but also improved soil quality and productive conditions of agricultural. In addition, it has also reduced cost of production and raised peasant's income, while adjusting the agricultural structure. Overall, land arrangement is still in early stage however. In most area, adding land quantity is still the task of land consolidation. It has not yet stepped into the advanced phase of farmland arrangement, which features to guarantee sustainable development of land, biological diversity and ecological balance. There still are many improper engineering measures in the current land arrangement of China. As a result, a series of problems have arisen, including water and soil loss, decline of biological diversity and ecological balance, soil harden, and deterioration of habitat environment. Finally, the nature ecosystem is led to converse development, forming negative eco-efficiency.Based on the land ecological theoretics of ecological balance, the change of any ecological factor will break intrinsic ecological balance of the land ecosystem. Once this balance could not be restored by nature functionally, it will induce a series of natural disaster. Accordingly, research on eco-efficiency is very important in the land arrangement activity.This paper adopted the method with combination of theoretical exploration and real example research, character depiction and chart account study. Depending on the research of land arrangements plus connotation and theory of eco-efficiency, the text systematically analyzed the relationship between land arrangements and ecological environment. And it summarized the possible effects of land arrangement on the ecological environment from a variety of aspects including water, soil, vegetation, atmosphere, biology, and much more. That will provide theoretical base to overall analyze the eco-efficiency of land arrangements.The text used the emergy theory. Started with the free energy change of natural environment input before and after land arrangement in addition to actual conditions of research area, it chose ecological factors according to actual conditions of research area, and computed the solar emergy of each ecological factor via solar transformity. Consequently, we educed the emergy value of eco-efficiency by land arrangement, and translated it into currency value with emergy-dollar ratio.We chose Honglan Town in Lishui Country as our land arrangement project for empirical research. This article computed solar emergy of ecological factor before and after land arrangements and eco-efficiency of land arrangements with the emergy theory. The results indicated that, ecological profits of land arrangements is 1.83×10⁵$ in the project region. Hereinto, the input increase of the systematic free energy value in farm production is the most significant. The value increase of O₂ release, CO₂ absorption, surface soil formation, sustain of nutrients circulation, water source self-restraint is relatively remarkable. On the other hand, the value increase of soil conservation is not very remarkable. From the results we can conclude that, the land arrangements project played an important role in improving the ecological environment of Honglan Town to a certain extent.