| Land is one of the components of the natural ecosystem,when the land use pattern changes,the service function and value of the regional ecosystem will be changed correspondingly,the quantitative evaluation of the service function and value of the regional ecosystem through land use change has become one of the research hotspots in geography and ecology.Dongshan Island,as a state-level ecological demonstration County,studies the land use change characteristics of Dongshan Island from the perspective of ecosystem service response to land use change,which can supplement the theoretical foundation of land use management of Dongshan Island and enhance the application value of ecosystem service protection.Therefore,this research applies the existing land use dynamic model and the theory and method of land ecosystem service value estimation to Dongshan Island,using remote sensing image data to analyze the land use dynamics of Dongshan Island 1994,2003,2011 three periods,and quantifying the change of service value of different land ecosystem of Dongshan Island,The response of land use change and ecosystem service value change in Dongshan Island is discussed.Through the research and analysis,the following main conclusions are obtained:1.Dongshan Island,as a state-level ecological demonstration County,under the guidance of returning farmland to forests,afforestation,landscape ecological construction and other policies,its woodland in the continuous increase trend in 1994-2011 years,from 1994 3365.09 hm2 significantly increased to 2003 5466.56 hm2,2011 was added to 5827.86 hm2,and in each land use type,woodland was the largest land use type and the most area increased.At the same time,because of the rapid development of Dongshan Island’s tourism development and urbanization,construction land has been in an upward trend.Although there are fluctuations in water,grassland and arable land,the overall change is not significant.2.From a single land-use attitude,it can be seen that the land use change in 1994-2003 is higher than that in 2003-2011,indicating that the land use change was faster in the previous stage and the land use pattern changed greatly.Compared with the first stage,the land use change rate of Dongshan Island in 2003-2011 years showed a trend of retreat,which showed that the land use structure of Dongshan Island in 2003-2011 was reasonable and the land use degree was higher.In 1994-2011,the attitude of comprehensive land use was 33.82%,which indicated that the land use change rate of Dongshan Island was faster in the study period.3.In the study time range,the comprehensive index of land use in Dongshan Island is gradually increasing;however,there is still a gap between the limit value of the comprehensive index of land use,and the utilization of land resources in Dongshan Island should be improved in 400.Overall,Dongshan Island land resources development and utilization level steadily rise,the growth rate first fast after slow.It is characterized by a large amount of unused land to be used for construction,which improves the utilization rate.4.From the value of ecosystem services,woodland and water has contributed a lot to the total value of the land ecosystem services in Dongshan Island,with a total contribution of over 80%,followed by farmland,grassland and other lands.The value of land ecosystem service in Dongshan Island was increased first and then decreased in 1994-2011,mainly because of the increase of the area of Dongshan Island and the area of construction.In 2003-2011 years,the effect of the increase of land area on Dongshan Island ecosystem services is to reduce the total value of Dongshan Island ecosystem service,indicating that the development of urbanization has a negative effect on the value of land ecosystem service.5.The greatest value of ecosystem services in all ecosystem services was water conservation,from 1.105 million in 1994 to 1.2007 million in 2003,to 1.5344 million in 2011,respectively,to 21.57%,22.45%and 21.31%of the total value.The second is climate regulation,the 1994 born value of 654,900 Yuan,2003 for 681,600 Yuan,2011 for 974,500 Yuan,the proportion of 12.78%,12.75%and 13.54%respectively.The third is biodiversity and conservation,of which the ecological value of 1994 years is 654,000 Yuan,2003 is 674,000 Yuan,2011 is 912,700 yuan,the proportion of total is 12.76%,12.6%and 12.68%respectively.The lowest value of ecosystem services is the functional value of food production,which has been reduced during the past 1994-2011 years.Biodiversity,gas regulatory capacity,raw material production,these three ecological services value in the study period of less volatility,waste treatment function service value showed a continuous rise,leisure and entertainment function service value increased.6.It is found that when the forest area of Dongshan Island changes by 50%,the value of the value of the farmland will change 0.648-0.678%,and the value change rate of the woodland is decreasing gradually.Although the change of construction land is relatively small,it shows a trend of increasing gradually.The impact of other land use on ecosystem service value has hardly changed the value of ecosystem services in Dongshan Island.7.The calculation results of the per capita land ecosystem service value show that because of the rapid economic development of Dongshan Island and the increasing area of construction land,the value of ecosystem service is greatly reduced,and with the increasing of population and the increase of the pressure of ecosystem,the service value of land ecosystem in per capita is decreasing. |
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