Measurement And Ecological Effectiveness Of Returning Farmland For Conservation In Shiyanghe Watershed

Rational utilization of land resources for sustainable development of oasis ecosystem is the basic guarantee, its use of types of distribution and size directly affect the region's economic, social and ecological balance in the relationship between them. Therefore, the correct formulation of land use planning and scientific decision-making has important practical significance.This thesis Shiyang River Basin (including Liangzhou and Minqin) as the study area, with the support of "3S" technology, combined with RTK-GPS, "Resource II" remote sensing data acquisition Basin 2006-2009 returaning farmland spatial distribution of irrigated area; Based on the Costanza theory of value of ecosystem services,refer to XIE Gaodi and others the Chinese terrestrial ecosystem services per unit area value scale, calculated in 1989,2000,2006,2008 the middle and lower reaches of Shiyang River farmland, woodland, grassland, orchard of four types of ecosystem service value, derived 1989,2000,2006,2008 type in the value of ecological change in plans. Shiyanghe River Basin for land-use Changes and land use change and ecological value of the relationship between the type of service conducted exploratory research, get some preliminary conclusions about:(A) in the actual survey work in Wuwei city, we have completed three years of Liangzhou and Minqin 2006-2009 returning farmland the 4040 block of measurements, involving more than 3,000 individual farmers, village groups and State Farms, measuring area 42188hm2, remove non-cultivated land 15403hm2. For detailed and accurate land irrigated with water area of space attribute information.(B) Wuwei Liangzhou and Minqin returning farmland for consercation distribution of characteristics:1) belt of sand along the edge of the oasis; 2) large areas of the island oasis oasis; 3) away from the population and area.(C) the use of components and the VB language MO establish returning farmland database, the main interface from the menu bar, the map display module, display module properties, toolbar button, the coordinates show the five-part column. Concrete realization of click/conditional query, zoom in/out, pan/roaming, full map display and statistical functions, easy to returning farmland area of query and update information.(D) Changes in the Shiyang River ecosystem types:1989-2008 area of grassland (natural grassland, pasture, grass, fixing category) from 23000hm2 to 385880hm2, 362880hm2; 2000-2008 years, the cultivated land (dry for farmland, to grow food, cash crops, etc.) from 159800hm2 reduced to 156513hm2, reduce the amount of 4860hm2. Basic dimensions of grassland remain unchanged from 386613hm2 reduced to 385880hm2, reduce the amount of 733hm2. Forest area (trees, shrubs, plantations, etc.) in 1989 to 2000 decreased by 99267hm2 into 59600hm2,increase the amount of 39667hm2,2000-2008, after the rebound, increasing 12400hm2, the area of 72000hm2. Garden area (orchards and orchards, and vegetables, forage farming, etc.) in 1989-2008 years by the 4133hm2 to 11807hm2, increase the amount of 7674hm2.(E) the entire middle and lower reaches of Shiyang value of ecosystem services between 1989-2008 increased from 3.4699 billion yuan to 5.3263 billion yuan, an increase amounted to 1.8584 billion yuan.1989-2008 years, keep the amount of farmland ecological value of±0.02 billion fluctuations, but the value of the four ecological types accounted for the proportion dropped 14.183%.. Value contribution of forest between 1989-2000 decreased by nearly 800 million yuan,2000-2006 between the increase and an increase of 239.7 million yuan Value. In 2008 compared to 1989, grassland ecological Value increased from 150 million yuan to 2.4721 billion yuan, increased 15 times, the value ratio increased from 4.323% to 46.413%, increased by 43%. By industrial restructuring and the role of the economic value of the market, garden valley Value from 2000-2008 years±0.02 billion to keep fluctuations.Based on the study of Shiyang River Basin returning irrigated farmland area measurement and land use change of ecosystem service value obtained returning irrigated area, Obtained returning irrigated area and the 1989-2008 distribution pattern of different land use types in the value of change,improve the ecological environment for the future development of the region provide some basis.