The Study On The Quantification And Integrated Assessment Of Landscape Services In The Fragile Area

With the rapid development of social economy in China,as well as the change of the human-environment relationship,how to bring the ecosystem services evaluation results effectively and scientifically into the human activity and decision-making has been paid more attention by the scholars both at home and abroad.Three typically landscape services were quantified and mapped by the Different Weight Method(DWM),the universal soil loss equation and In VEST models in Mizhi County of Shaanxi Province,namely arable production services,soil conservation services and plant habitat services.The spatial distribution and dynamic change characteristics of the different landscape services were analyzed between the year of 2009 and 2013.Above the anlysis,the the mutual relationship of the three landscape services were revealed,and then the integrated landscape services of 2009 and 2013 were mapped and analyzed.Finally,the cold and hot spots of the landscape service were representated by spatial dynamic.Several conclusions were drawn on as the following:(1)It was an effective method that DWM could show the effect of the different factors on the single landscape service.Through setting the affecting the weight of different factors on the single landscape service,and company with the actual survey datas,the ervices spatial differentiation of the different landscape s could be truly reflect.The most important factor of the arable production services was the land output per unit area among the four factors;But on the whole,the effect of natural factors on cultivated land production services was greater than the influence of human factors,and the effect of the elevation of cultivated land had much more significant influence than any other natural factors.(2)The difference landscape services showed the difference spatial distribution pattern in the study area:The high type of cultivated land production service was mainly distributed in the central of Mizhi County,the low type of cultivated land production service was mainly located in the south and northeast of Mizhi County;The high type of soil conservation service was mainly distributed in the east and west of Mizhi county,the low type of soil conservation service was in the central of study area;The high type of habitat service was mainly distributed in the central,east and west local area of Mizhi County,the low type of habitat service was distributed in the whole of study area,but was concentrated in the central and east areas are relatively.The high type of cultivated land production service area was increased by 18.42km~2,the medium type and low type of cultivated land production service area was decreased by 25.12km~2 and 25.12km~2 respectively from 2009?to 2013;the high type and the medium type of soil conservation service area was increased by 59.04km~2 and 59.04km~2,and the low type of soil conservation service was decreased by 104.42km~2;the high type of habitat service area was increased by 114.86km~2,the medium and low typeof habitat service area is less the 51,13km~2 and 51.13km~2 respectively.(3)Through analyzing the interaction relationship and the integrated landscape service of the three landscape services,we could find:a relationship of trade-off between the cultivated land production service and the soil conservation service,and between the cultivated land production service and the habitat service were presented,but a collaborative relationship was showed among the soil conservation service and the habitat service.The high type of the integrated landscape of service was mainly distributed in central and its surrounding several main channel area of Mizhi County,the low type of integrated landscape service was mainly distributed in central urban area of Mizhi County,and the east and west was relatively scattered.From 2009 to 2013,the high type of integrated landscape service was increased 129.61km~2,the low type of integrated landscape services was decreased 55.51km~2,the integrated landscape service was improved on the whole of study area;The hot spots of landscape service was mainly concentrated in the central of study area,the cold spots of landscape service was concentrated in the east,from 2009 to 2013,the landscape service hot spots obviously increaseed and the cold spots down slightly,the largest hot spots of landscape service was at Yinzhou town,and the least hot spots of landscape service was at Lizhan town and Jijiacha town.