| Ecosystem plays a very important role in maintaining biomass cycle,water soil conservation and water source conservation and so on.Along with the continuous development of economy and technology,human beings are constantly taking from the natural environment.Human exploitation of the natural environment is far beyond its scope,resulting in a series of environmental problems.Changzhi City,Shanxi Province,is a typical resource-based city.For a long time,the economic development of Changzhi City depends too much on coal resources.Due to the over-exploitation of resources,the quality of ecological environment in Changzhi City has been declining,ecological security has been seriously threatened,and the ability of ecosystem to provide services to human beings is becoming weaker and weaker.The study on the value of ecosystem services can directly reflect the regional ecological environment change in the form of numerical value.The research results are meaningful for the government's resource development and urban planning.This paper takes Changzhi City as the research object,after understanding the research progress of ecological environment sensitivity,land use/cover change(LUCC)and ecosystem service value accounting and evaluation at home and abroad,the changes of land use and ecosystem service value in Changzhi City in 2007,2013 and 2017 were calculated and analyzed based on RS,GIS and grid technology.And on this basis,the land use situation of Changzhi City in 2021 was predicted.The main research results are as follows:(1)According to the analysis of the land use status of Changzhi City in2007,2013 and 2017,the main land types in Changzhi City are cultivated land,grassland and woodland.In 2007,the cultivated land was the most widely distributed,with the largest area being 619911.5hm~2;in 2013,the grassland area was the most,which was 547136.7 hm~2;in 2017,the forest area was the most,which was 641005.9 hm~2.Based on the topographic analysis,the land is mainly distributed in the 800-1700m elevation range and the 0-30°slope range,and the area ratio is over 93%.(2)According to the analysis of the land use transfer matrix of Changzhi City,the types of land that were converted were mainly cultivated land,woodland and grassland from 2007 to 2017.The grassland area increased by75.1%,the construction land increased by 64.1%,the forest land area increased by 51%,the cultivated land area decreased by 72.5%,and the unused land area decreased by 52.5%.The water area first increased slightly and then returned to the original level.(3)Through calculation and analysis of land use single and comprehensive land use dynamics,land use comprehensive index and change rate in 2007,2013and 2017,it was found that the cultivated land and grassland changed the most.In general,land use was more active in 2007-2013,and the most varied was grassland.Land use activity declined slightly in 2013-2017,mainly due to the decrease in unused land and cultivated land.In the period of 2007-2017,the comprehensive utilization degree of land use in Changzhi City showed a downward trend,and the overall land use degree changed from medium to medium-low.(4)Through the calculation of the value of ecosystem services in the study area in 2007,2013 and 2017,the value of ecosystem services in Changzhi City in 2007-2017 is generally on the rise.The total value of ecosystem services increased by 109.946 million yuan in 2007-2013,and the total value of ecosystem services increased by 173.88 million yuan in 2013-2017.Among different land types,the ecosystem service value of forest land is the largest;in terms of topography,the largest service value is on the 800-1100m elevation gradient and the 0-15°gradient gradient.(5)The distribution and variation characteristics of various land and single term ecosystem service value in Changzhi City were calculated based on the terrain.The value of different land type and single term ecosystem services in2007-2017 among the 800-1100m elevation gradients and the 0-15°gradient gradients was the largest.The main changed land types are cultivated land,forest land and grassland.The value of cultivated land is gradually reduced,and the value of forest land and grassland is increasing.In terms of service types,except for the value of food supply and waste disposal is decreasing,the value of other types of services is increasing by year.(6)Based on the data of land use and ecosystem service value from 2007 to2017,sensitivity analysis was carried out.It was found that the highest sensitivity index was grassland,followed by cultivated land,and the sensitivity index of water body was the smallest.It illustrates that the value of grassland ecosystem services is most sensitive to land use change,and the value of water ecosystem services is least sensitive to land use change.Through the calculation of the coordination between ecological and economic development,it is found that the coordination degree of ecological and economic development in2007-2013 is 0.05,indicating that economic development has exerted certain pressure on the environment;from 2013 to 2017,it is 1.07,indicating that the coordination between ecology and economic development is high.(7)Land use in 2021 was predicted based on the 2017 land use status map using the Markov model.The results showed that by 2021,the area of cultivated land and unused land decreased slightly,while the area of woodland,water,grassland and construction land increased slightly.This is consistent with the policy of developing characteristic agriculture,protecting basic agricultural arable land,carrying on water conservancy construction and protection,developing tourism industry and strictly controlling the new construction land in Changzhi City,The prediction results are basically credible. |
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