Grassland Ecological Security Evaluation In The Transition Zone Between Cropping Area And Nomadic Area Of Northern Shaanxi

Grassland is the largest land-use type in the terrestrial ecosystem of the Earth,and plays a key role in global ecological stability,agricultural and livestock development,climate regulation,water conservation,and biodiversity and economic development.Located in the Yulin area of the farming-pastoral ecotone in the transition zone between China’s agricultural and pastoral areas,there is a shortage of hydrothermal resources,unstable land use conditions,and abundant mineral resources and reserves,especially in the north six counties occupying80% of the city’s land resources.And most of the mineral resources.In order to maintain the sustainable development of the social economy in the Yulin area,a large number of uncontrolled exploitation of natural resources poses a threat to the safety of the ecological and even social and economic survival systems of the region.This paper selects the grassland resources in this area as the research object,and uses the PSR(pressure-state-response)model to evaluate the grassland ecological security in 2010 and2016,and selects 16 grassland ecological security from natural,economic and social aspects.Relevant indicators of the situation,established the grassland ecological security evaluation index system of Beiliu County,Yulin City,using the analytic hierarchy process-entropy weight combination method to determine the weight of each index,and using the comprehensive index method to apply the grid calculator to 100×100m in ArcGIS software.The grid unit is calculated,and the previous researcher’s classification rules for grassland ecological security and the land ecological security classification rules of the study area are combined to classify the grassland ecological security level and determine the safety level of the grassland resources in the six counties.Corresponding countermeasures and recommendations.Research indicates:(1)In the evaluation of grassland ecological security in the study area,the weight of the state layer is relatively large,and the state layer index has a great influence on the ecological security evaluation results of the study area.The attribute indicators of the state layer are all derived from the natural attributes,indicating that the ecological security of the grassland is affected by nature.Significant changes have occurred in changing environmental conditions.(2)From the time scale,the overall grassland ecological security in the study area hasbeen declining from 2010 to 2016,and the area below the grassland ecological security insecurity level has increased,and the standard deviation of the comprehensive index has increased in 2016,indicating that 2016 Grassland ecological security fluctuated greatly and its stability was lower than that in 2010.Shenmu County and Fugu County had higher resource conditions,higher socio-economic level,higher investment in water conservancy and environment,so grassland ecology from 2010 to 2016 The safety situation showed a benign development,the stability was also good,and the ecological safety level was improved.Both Puyang District,Jingbian County and Dingbian County were reduced.The main reason was that the resource consumption was too large,although the input was strengthened,but the effect was not obvious;Hengshan County has excessive use of grassland,relatively low economic level,and poor environmental protection investment.Therefore,the ecological security of grassland in two years belongs to the worst of the six counties.(3)From the spatial scale,in 2010,the safety level of the study area was the lowest in the eastern part of the eastern part of Hengshan County,and the overall status of the county was ranked as Yuyang District>Shenmu County>Fugu County>Jingbian County> Bianxian County > Hengshan County,in 2016,the eastern region continued to increase the level of the central and western regions,and the overall situation of the county was ranked Fugu County>Shenmu County>Yuyang District>Jingbian County>Yangshan County>Dingbian County.For the evaluation results,the most important thing is to propose reasonable countermeasures and suggestions for maintaining grassland ecological security.This paper starts from the reality of grassland ecological security in the study area,advocates the ecological safety priority theory,and constructs the grassland ecological security control system.Control various ecological red lines,combine computer technology and "3S" technology to establish a grassland ecological security monitoring system,management system and even legal protection system for precise control of the system,so that grassland ecological security construction is more scientific and convenient;In terms of improving the quality of the population and strengthening the awareness of ecological security protection;at the same time,it is necessary to improve various rules and regulations,laws and regulations,and provide mandatory and strong protection for grassland ecological security protection;propose to build grassland ecological security zones,and divide different regions into different policies.And technology to promote grassland ecological security construction,so as to adapt to the natural conditions of the subregion,the status of animal husbandry and the status quo of social development.