Land Ecological Safety Evaluation In Agro-pastoral Zone

With the development of social and human on the strengthening of land use degree,land ecological problem is more and more outstanding,also received extensive attention from all walks of life at the same time,the land ecological security problem has become the important field of ecology,geography research.As an important ecological barrier of farming-pastoral zone of backward economic development,ecological environment is very fragile and sensitive,so the land ecological security assessment is particularly important.In this paper,considering the farming-pastoral zone,special geographical location and its important role in the ecological environment,and in Ulanchap city located in the hinterland of farming-pastoral zone of,for example,to evaluate the land ecological security condition analysis,determine the security levels,is possible for the existing or future ecological problems put forward the corresponding countermeasures for prevention and control.Analysis concluded that the characteristic of farming-pastoral zone and farming-pastoral zone in arid and semi-arid area,less annual rainfall,evaporation to rainfall of more than ten times,at the same time the ground water resources and uneven distribution of lead to less farming-pastoral zone in a state of severe water shortages;The land use type of cultivated land and grassland coexist,the boundary is constantly changing,the type of land is intricate;Summer rainwater concentration,short history,strong strength,high winds and the sparse vegetation cause soil hydraulic erosion and wind erosion serious;Agriculture and animal husbandry were the main economic industries,and the economy lagged behind.Analysis of the study area of land use types,it is concluded that the main land use types of Ulanchap to grassland,covers an area of 32186.24 km2,accounting for 59.19%of the whole land area in the study area,followed by the cultivated land area of 14828.72 km2,accounting for 27.27%of the entire study area land area,the main land use types are cultivated land and grassland,cross on the space distribution,is a typical farming-pastoral zone.According to the characteristics and selection of the specific conditions of Ulanchap farming-pastoral zone 12 evaluation indexes in the framework of P-S-R model construction of land ecological security evaluation index system,with 10 km2*10 km2 grid as evaluation unit,by using Delphi method and analytic hierarchy process(AHP)is applied in determining weights of indicators,using the linear weighted sum model were evaluated on the basis of the five kinds of land ecological security level.Ulanchap city analysis and evaluation results show that in 2000 and 2013,the land ecological security level is medium security status,great differences in the space,compared with 2000 in 2013 decreased trend.At the same time,according to the change tendency of land ecological security in 2000-2013 to warn the trend of ecological security status of the study area,found that some areas are frequently degradation due to human activity,some due to the implementation of ecological restoration project has improved trend.Ulanchap city on this basis,according to the existing problems of land ecological security is put forward to strengthen the construction of the natural ecology and the development of green economy industry,rational utilization of grassland resources,in order to promote the urbanization process,to establish ecological security early warning mechanism,improve the ecological security awareness and other ecological safety control measures.