Based On Gis In Ecological Adaptation Of Agro-climatic And Agricultural Sustainable Development

Based on earth sciences' research theme of the relationship between man-land coordinate system,with GIS technical support, selecting the relevant area of cultivated land in the comprehensive evaluation index, agro-climatic factors of the space grid and grid-scale agro-climatic evaluation of ecological adaptation,This paper focused on the assessment of the pattern of food safety in Guanzhong area, and revealed the rule of the spatial distribution pattern from the standpoint of Spatial Geostatistics Analysis. The main mainly agricultural ecosystem climate elements in Guanzhong area was changed into raster format spatially. In this process, it is pioneering to change the longitude and latitude layers to raster layers.Based on spatial process, the assessment of climate suitability of the agricultural ecosystem was made by GIS software platform and Fuzzy mathematical methods, and finally got the spatial distribution patterns of the climate adaptability in grid scale. On this basis, using multi-index synthetic methods, the further integrated assessment research for the sustainable development of agriculture in Guanzhong was made, following main conclusions.①Based on regional agricultural foundation bearing capacity assessment of population-land-food system, and the counties' evaluation of pressure index of cultivated land in long sequence and the spatial autocorrelation of t Spatial Geostatistics Analysis, the conclusions are as follows:(1) The population growth in Guanzhong area took on a kind of growth stages, and the growth rate was smaller and smaller. In 1949-1976, the population growed rapidl. The population has increased from 7480.8 thousand in 1949 to 1.61572 million in 1978, nearly 9000 thousand during the 30 years. From 1978 to 1996, it was the second stage of population growth, the growth rate in this stage is greatly reduced than the previous stage, the population growed from 1.63152 million in 1979 to 2.0668 million thousand in 1996, nearly 3700 thousand during the 17 years. In 1996, the population growth rate slow down in further, but the population continued the trend of increase and hard to change in a short time. Up to 2007, the population was nearly 2.4 million.(2) 2)In Guanzhong area, the grain production volume was a kind of rising trend of fluctuations since 1949.An obvious trough in 1960 and 1978, while in 2000, the regional grain production.reached a maximum. The grain output increased by more than three times from 2024.852 thousand tons in 1949 to7730.9 tons in 2006. (3) Cultivated area changed from 2186.64 thousand hectares in 1949 to 2299.187 thousand hectares in1957. Due to large amounts of land consolidation at the founding, the cultivated land resource reserved was converted to cultivated land area of arable land. After 1958, cultivated area reduced constantly.Up to 2007, arable land was 1757.853 thousands of hectares. (4) Since 1949, the actual per capita minimum total cultivated area in Guanzhong area has been higher than average per capita cultivated area. To achieve 400kg per capita consumption level of grain, the grain output pressure of cultivated land always exist. Minimum per capita cultivated land of each region since 1989 was continuously continuously decreasing. In Tongchuan city and Weinan city, the minimum per capita cultivated land area was largest. (5) The spatial agglomeration of cultivated land pressure index and land resource capacity index was that low value of agglomeration concentrated in the central region in Guanzhongon area. In the western counties of Xianyang city, the eastern and middle counties of Baoji city in Guanzhong region will be the important region to be concerned in the future development of agricultural production of Guanzhong region. Shaanxi province should pay attention to this, and increases input of agricultural production and infrastructure construction to promote the development of agriculture.②Based on the agricultural climate ecological suitability model test, the spatial distribution pattern of resources index was low in the north and high in the south., so the latitude zonal rule was obvious. The spatial distribution pattern of efficiency index was high in the middle and low in the north and south. The efficiency index was higher in hills, and the mountain stereo agriculture development needed further strengthened. From the perspective of agricultural climate resource index,the general pattern was high in the north to low in the south. Although resources index and efficiency index in the north was low, but the northern illumination condition was good, and the final spatial pattern of utilization coefficient was a decreasing trend from the northeast to southwest region.The agricultural production layout in Guanzhong region should make full use of the northern illumination condition and the southern rainfall and humidity conditions, and adjust the spatial layout of agricultural production to local conditions. Meanwhile, the water conservancy facilities of agricultural production in the northeast should be strengthened.③Based on the agricultural ecological and economic system coordination degree evaluation model, the coordination degree of agricultural ecological and economic system in Guanzhong region was evaluated comprehensivly. The agricultural ecological comprehensive index in Guanzhong region increased slightly from 0.52 in 1999 to 0.54 in 2001. In 2002, there are a large increase in 2004, and fall suddenly in 2004. After 2006, it showed a small rise again, until to 0.55 in 200. So it changed fluctuation in a small cycle.overall. The agricultural economy development level have been rising in Guanzhong region, from 0.14 in 1999 to 0.72 in 2008,and in the situation of increase every year. It was a good thing for the agricultural economy development in Guanzhong. The rural economy growing was significant for the rural getting rid of poverty and social stability. The general level of social system in Guanzhong area rised fluctuatly. In 2008, the level of all regions has declined. The agricultural ecological economic system experienced the development process from disorder to coordination in Guanzhong region (extreme disorder-low coordination-weak disorder). The coordinate index of the agricultural ecological economic system in Guanzhong region was between 0.6-0.7, and the development tendency in the whole area was good, but each prefectures showed different trends. The coordinated index of economy and society systems in all the cities of Guanzhong region was an upward trend, and the coordinated levels in Xian and Yangling regions were higher.Based on the conclusions above, the development strategy of different levels was put forward for the sustainable development of agriculture in Guanzhong region from the strategy aspect, so as to provide scientific decision-making basis.for the future of agricultural sustainable development in this region.