Study On The Spatial And Temporal Variation Of Regional Agriculture Ecological Environment Quality And Ecological Economy

According to the primary eco-environment issues, the index systems for assessing the temporal and spatial variation of regional agriculture ecological environmental quality and ecological economy were established through combining the agriculture ecological environmental quality and ecological economy together, and synthesizing the ecological environment, society and economy by taking the different economy zones and cities of Jiangsu province as an example. Based on the models of agriculture ecological environmental quality and ecological economy, the temporal and spatial variation of regional agro-ecosystem environmental quality and ecological economic were analyszed in the scale of city and economy zone. At last, the paper put forward a series of counter measure to achieve the regional agro-ecosystem sustainable development.1. The index for quantifying the spatial and temporal variation of regional agriculture ecological environment quality and ecolofical economy were screened and tested based on the sustainable development theory, environment carrying capacity theory, and the assessing models of agriculture ecological environment quality and ecological economy were developed. The temporal and spatial variation of agriculture ecological environment quality, ecological economy, and harmonious development level of agriculture ecological environment-economicwere synthesized.2. This paper constructed a perfect index systems of the temporal and spatial variation of regional agriculture ecological environmental quality and ecological economy through two assessing unit which in the scale of city and economy zone. The former was made of composite environmental quality index (target arrangement), natural environment status, ecological status and environmental pollution (rule arrangement), and16indictors (indicator arrangement). They were:active accumulated temperature≥10℃, mean annual temperature, annual precipitation, annual sunshine hours, vegetation cover, land multiple cropping index, volume of water and soil loss, pH of soil, organic matter content in soil, nitrogen content in soil, phosphorus content in soil, potassium content in soil, use of fertilizer per hm2of farm land, discharge intensity of industrial waste water, discharge intensity of industrial waste gas and discharge intensity of SO2. The latter was made of the level of ecological economic sub-system sustainable development (target arrangement), agricultural environment status, agricultural society status and agricultural economic status (rule arrangement), and14indictors (indictor arrangement). They were:agricultural ecological environmental index, regional population size (inhabitants per km), proportion of agricultural laborer, average per capita amount of arable land, true irrigation area, grain yields per hm2of arable land, agriculture production value per hm2of arable land, agriculture production value occupy the scale of village production value, fiscal support expenditure in agriculture occupy the scale of financial expenditure, electricity consumption per Gross agricultural output value, net income per villager, agricultural labor productivity, agricultural land productivity, per capita average GDP of agriculture, grain per capita, total powers of agriculture machine per hm2.3. Based on the models of regional agriculture eco-environment and eco-economic, taking the economic zone and country as the assessment unit, the spatial and temporal variability of agricultural ecological environment quality was assessed through the regional agro-ecosystem composite environmental quality index and ecological economic development level. Then, combined the agriculture ecological environment quality index and ecological economic development level together, in order to assessing the development tendency and ability of agricultural ecological system through the harmonious degree between agricultural ecological environment quality and agricultural ecological economy.4. Taken Jiangsu province for example, the spatial and temporal variation of agriculture ecological system of Xulian, Yanhai, Ningzhenyang, Yanjiang and Taihu economic zone were synthesized based on the analysis of the vegetation cover, water and soil erosion, and environment pollution in special years. The assessing results indicated that the vegetation cover and water and soil erosion was increased temporally as the years go by, and the vegetation cover increased spatially in general, however, the variability of water and soil erosion was different.(2) The agriculture ecological environmental quality index of five economic zones decreased from north to south of Jiangsu Province in the ecnomy zone assessing unit, and the assessing resuts of agriculture ecological environmental quality index was homogeneity and heterogeneity in the city assessing unit.(3) The spatial and temporal variation of the agriculture ecological environmental quality was obvious, and the agriculture ecological economy of five economic zones increased from north to south of Jiangsu Province and also increased obviously as the years goes by. The agriculture ecological environmental quality of Xulian and Tai Lake decreased from1999to2008, and the agriculture ecological environmental quality of Xulian economic zone was much better than Tai lake economic zone. The coordination development level of agriculture ecological economic of Xulian and Taihu economic zone increased gradually from1999to2008, and to preserve in good or excellent coordinative condition. The coordination development level of agricultural eco-environment-economic of two economic regions was both high, but decreased from1999to2008, and still keeps in good or excellent coordinate condition.