Research On Land Ecosystem Service Value In Xi’an City

Ecosystem services have an important impact on human survival and development,which offers a variety of natural resources for human, absorption and transformation of thewaste which comes from the social and economic systems. The land-use change have aneffect on ecosystem service value, evaluated the ecosystem services is helpful to protect theecological environment security and achieve sustainable development of society.In this paper,the study is based on the table of equivalent value per unit area of ecosystem services in china,using the the Constanza’s ecosystem service value(ESV) theory and the time sequencedata(2001-2011), the changes of land-use and ESV was analyzed and the relationship betweenthe two was discussed. The main results are summarized as followings.(1)From2001-2011, the land-use of study area changed quickly, with the rapid increaseof the garden plot, woodland, construction land, and the decrease of cultivated land, grassland,water area and unutilized land, the land use degree showed increasing trend. The land usechanged mainly happened in the stage from2006to2011, the dynamic degree of every typeland use in this stage is higher than the stage from2001to2006.(2) Analyze the differences between each district of Xi’an, it shows that the land usedegree of Xincheng District, Beilin District and Lianhu District are much higher than others,and their land structure is stable. The land use structure changed single simplified andincreasingly concentrated except Baqiao District and Yanliang District. The grasslandchanged a lot,and it mainly happened in and Gaoling Country, and many districts werechange hotspots of garden plot, woodland and water.(3) There was a2.90%net increase in land ecosystem service value(ESV), from2181.35×107yuan of2001to2244.72×107yuan of2011.The ESV of every land use type wason the decline except garden plot and wood land. Analyze the individual ecosystem servicevalue, we can find the ESV of biodiversity and soil conservation were the two highest, thevalue of ervry item is on the rise except food production，water conservation and wastetreatment. Study of regional difference of the total ESV shows that only Chang’an District,Lantian District and Zhouzhi County’s ESV is increasing, others’ is reducing. Per unit ESV inWeiyang District reduce much more than others, reach6095.93yuan.The sensitivity analysisshowed less dependency (<1) for every type of land-use, which indicated high reliability ofthe results. The ecology-economy-coordinated development in Xi’an City was low and keep for a long time.(4) Based on the willing to pay, ability to pay and scarcity of resources, a dynamicevaluation method is proposed. The dynamic value of Xi’an is41871.1million in2001，andthen increased to54083.8million in2001. The study period can be divided into two period,from2001to2007the ESV presents a fluctuant decreasing tendency, and it present anincreasing trend from2007to2011. It shows that the dynamic value was seriously influencedby human factor.(5) Using grey correlation model calculate the the correlation degree between land usechanges and ecosystem service value and then sort them: cultivated land＞woodland＞gardenplot＞construction land＞water area＞grassland＞unutilized land; Based on correlationanalysis and regression analysis, it can see that the relationship between land use structure andESV is a linear, the diversification and increasing index of dominance will go against the raiseof ESV.