| Ecological safety is the current hot issue, but also affected the Loess Hills area of sustainable agricultural development of the important factors. Papers fully absorbed in previous research on the ecological security, based on ecological safety should be within a certain time scale, different levels, different types of ecosystems to maintain their own normal structure and function of human and sustainable development to meet the needs of the state. Stressed agro-ecological safety of agricultural ecological environment is pollution-free, and not free from the threat of destruction of the state of health. Stressed agro-ecological safety of agricultural ecological environment is pollution-free, and not free from the threat of destruction of the state of health. On domestic and regional ecological security evaluation of the model and framework for a comparative analysis indicator system, AHP concept model with the State-combined Construction of the Loess Plateau ecological security evaluation system. The indicator comprises 16 indicators, Include :the average annual precipitation;≥10°C temperature; The vegetation coverage rate; Soil erosion; Water satisfaction rate; Arable land per capita; per capita food; The natural population growth rate; population density; fertilizer unit load; pesticide load per unit area; per capita agricultural GDP; cent of the total agricultural capital construction investment ratio; above the middle school population; non-agricultural population ratio; Engel's coefficient. Cover their own system of the state of nature, and system pressure system response three, This will ensure that the indicator system to choose scientific and completeness. Based on the evaluation of the properties, and the level of domestic and foreign-related standards, the development of regional ecological security evaluation criteria and grading. Respectively AHP and expert scoring for regional ecological security evaluation indicators empowers and using agro-ecological safety level index to characterize the results.Ansai County, and the choice of subjects Baota District, in its analysis of the system, based on agro-ecological security evaluation according to agro-ecological security evaluation grading standards, excellent, good, medium, four standards, the results are : (1) From time series, in 1985, 1990 and 1995 Ansai and pagodas are in the middle of the lower level of security, but security is almost index, These, and the slow development of the then lack of funds and low technological level of a certain relationship As the economy and the development of science and technology, and the state of returning farmland to forest policy implementation Starting in 2000, to develop a good level of the year 2004, So from 2000 onwards these two regional ecological security governance and development is very effective. (2) sequences from the geographical point of view, has been compared in Ansai County, a slightly higher level of security. Ansai County, which has been the system pressure is smaller, This is due to the Tower region has been great population pressure, population density, chemical fertilizer and pesticide load units serious, and the per capita grain shortage This led to pressure for increased recessive factors. Although the system response Baota District and state of the system than Ansai County, but the system pressure as potential factors, more delay and uncertainty, the risk is even higher. Therefore, the Comprehensive Operational come to the evaluation of Ansai County, slightly more than Baota District safety. (3) Although this paper come to the conclusion that the Tower region of Ansai County than just security, but the two have remained a regional level. From the long-term development, the Baota District agro-ecological security will be greater than Ansai County. Along with the development of the commodity economy, the number of local food production will cease and the number of grain per capita is necessarily. Moreover, with the promotion of ecological agriculture, the use of chemical fertilizer and pesticide reduction was relief and other green manure fertilizer substitution; within a certain range of population density will not cause ecological crisis, the population density requirements will not be so strict as in the past. On the economic front, Baota District's GDP in 2005 was 12.394 billion yuan. Ansai'GDP in 2005 was 1.366 billion yuan in economic input capacity on the pagoda was more dominant. So predictable system in a state of good and positive response to the system under the condition that further reduce the time pressure Tower region of the agro-ecological safety will exceed Ansai County.Papers focused on regional research in Baota District Ansai County of the ecological environment of the system, threats Loess Plateau agricultural ecological safety of the main issues are: (1) significant than the rural population, low overall quality of the population; (2) inadequate bearing capacity of the land, low quality land, per capita food shortage; (3) put too much fertilizer, water and soil pollution; (4) inadequate investment in agriculture; (5) Irrational industrial structure. To address these problems put forward a series of measures and recommendations:(1) to enhance the safety management of agricultural ecology, the development of eco-industries; (2) vigorously improve the quality of the population; (3) to strengthen agricultural ecological security system; Establish and maintain a stable socio-economic environment for development ;(5) Continuously increase the income of peasants, and promote the building of the ecological sustainable development.. |
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