Study On Ecological Risk Of Unused Land Agrochemical In Tarim River Basin

From 1981 China began to enter the era of reform and opening up,while accelerating the economic and social development of the western region,the demand for land development and utilization is becoming more and more important.The unused land resources not only have the function of the city development,the population increase,the resource carrier of the industrial transfer,but also have more important ecological significance.But the unused exploitation and utilization of unprotected measures has led to a series of ecological environmental problems.Xinjiang is located in the northwest border area of China.There are many factors such as vast territory,sparse population,drought and sunshine,which make it rich in unused land resources.The development and utilization of unused land resources in Xinjiang has a long history,especially after liberation,the scale is more unprecedented.But at the same time,the development of unused land resources in Xinjiang has also brought serious ecological damage under the great offensive of new and old concepts and technology.In this paper,Taking Tarim River Basin as the research object,the exploitation of agricultural production(conversion)response from the perspective of ecological environment,selected 183 pieces of unused land,agricultural ecological risk assessment unit,construction of unused land agricultural ecological risk assessment system,based on the soil in the river basin water resources,environment and social and ecological environment,spatial analysis draw the following conclusions:(1)The regression coefficient(response coefficient)of the assessment index of ecological vulnerability in Tarim River Basin is 0.0895,the p H of soil is-0.2015,the content of organic matter is 0.0010,the degree of soil salinization is-0.6332,and the index of irrigation water consumption is-0.3836.(2)Low risk zone mainly concentrated in Ruoqiang Qiemo county with low risk,low risk of the Atushi Wuqia County,Pishan County,with low risk,low risk of Yengisar-Shache County wind;Akeqi-Wushi County low risk zone.The central risk zone is mainly distributed in most areas along the middle reaches of Tahe coast,with a unit RImean of 0.2494.High risk concentration with high risk zone of Akesu,Moyu County in Jiashi county with high risk,high risk zone.(3)In Akesu and the social ecological carrying capacity of Bazhou area index at a high level in the Tarim River Basin,early warning critical value M were 0.5143 and 0.4356,the development of land ecological risk F values were 0.4369 and 0.3435,more than 75% of the environmental resources carrying capacity index,warning degree reached above II level.(4)Tthe ecological risk index of Bazhou,Akesu,Ke Zhou,Kashi and Hotan increased by 0.0021,0.0062,0.0032,0.0022 and 0.0035 respectively,and the average growth rate of the whole watershed risk index was 0.0034 per 10000 hm2 of unused land.