The Research on Harmonious Ecological Comprehensive Treatment Model of Saline Land in Lubotan, Shaanxi Province

Not only soil salinization is the synthesis problem involveing Agriculture, land, water resources,but also the Eeo-environmental problems, soil salinization As an important land resources, on integrated development of agriculture and agri-industrial have a greater potential, its governance of great significance. At present, both at home and abroad follows the model of "freshwaer pressure salt,drainage washing salt",However, shortage of water resources, a fragile ecological environment, socio-economic development of backward areas, the traditional model had challenge.In this study, the succession at the basis of previous studies to improve the ecological environment as the goal. Comprehensive management model put forward by nearly a decade after the practice. the great benefits of "economy—society—ecology" have been achieved. To ensure that the region "of -water and soil-biological-the environment," the harmonious development of the ecosystem. Study on the main results achieved are as follows:(1) The comprehensive treatment model of "change drainage to impoundment, water and land get along, harmonious ecological" was put forward. Base on the "economy—society—ecology" of an integrated system of agricultural measures was established.(2) In Lubotan, occasional long-term observation and field observations of water and salt test, observation and analysis of different fields and in different depth at different times the salinity、pH value and ion content of the key factors has been summarized. The results showed that the effects of the treatment of saline land in LuBoTan under harmonious ecological treatment model.(3) The research on salt movement of adjacent part between water and soil under the storage condition was developing, has revealed to the mechanism of the cycle of pressure salt.By the high-water level and small concentration of salt and high concentration of salt case, relized the salt in the water diffusion to the soil,the salt into down-part was researched,Improved implementation of the purpose of the arable layer of soil.(4) The experiment on the salt movement in the special layer of soil under storage water condition, There will be a transition layer(10-20cm) from the results. This layer is the lowest range of capillary evaporation transition, and it can isolate the salt of lower layer, Saturated layer of salt content is relatively stable.(5) For the water and salt balance calculation on the Lubotan, Analysis of the groundwater level and salt interannual dynamics.1999～2007 Into the salt 0.0144×104t more little out salt 0.0497×104t, Cumulative desalination 3178t, The average salt content of soil from around 0.45 before treatment decreased to 0.2 around 2008, the overall regional trend in desalination pressure salt(6) Traditional farmland in the analysis based on the drainage design, In accordance with the water storage, Studied the groove depth of water, spacing, cross-section, as well as water management districts in the proportion of engineering design optimization problem. Combination of the Lubotan Analysis of the pilot project design, Test area to draw water groove depth of 2m, spaced 120m, the water ratio is about 8.5%to reach the optimal, ensure the effectiveness of saline-alkali soil, but also to maximize the savings in land resources.(7) The comprehensive evaluation index system has been built for the ecological harmony of farmland, including 5 the first level indicators,22 the second Level indicators, The AHP and MATLAB methods were used to determine the weight indicator, The calculation results S=86.709, the evaluation system was applied on the Lubotan saline land. After the model of governance waiting for the soil has changed, suitable for crop growth, regional air quality of the higher body of water, ecosystems sustainable.(8) Application of modern information technology, communications technology, set up dynamic monitoring of saline water and salt information service platform, Salinization of soil on the distribution, evolution and soil quality monitoring and modeling of long-term follow-up research, find the best mode of macro-ecological regulation and environmental protection strategies.