| Land use/land cover change(LUCC)is one of the core contents of global environmental change research.Ecosystems provide regulation,supply,support and cultural services,and assessing the value of ecosystem services helps people understand the importance of ecosystems.In order to better understand the changes in land use and land ecological service value in Yunnan Province from 2000 to 2020,promote the rational development and utilization of land and ecological environmental protection,and promote Yunnan Province to realize"golden mountains and silver mountains"from"green water and green mountains",this paper obtains basic information data through remote sensing image interpretation,analyzes the land use status,change speed and utilization degree in Yunnan Province,analyzes the characteristics of land use transfer,compares the number of land type changes in various states and cities,and analyzes the distribution characteristics of land type changes.At the same time,the value equivalent factors were revised according to the average grain output per unit area and the unit price data of grain in 2000,2010 and 2020,respectively,and the value of land ecological services was calculated.Then,by dividing the grades,the changes and trends of land ecological service value of 129 county-level administrative units in three periods were analyzed,and the quantitative and spatial changes of ecological service value of 129county-level administrative units were observed.The spatial agglomeration status of the total value of land ecological services in 129 county-level districts was studied,and the hot areas of land ecological service value in Yunnan Province were found.The results show that the land use pattern of Yunnan Province has undergone great changes during the study period,and the area of construction land and water area has continued to increase.The area of grassland and wetlands showed a continuous decline trend;The area of arable land and forest land showed an increasing trend of fluctuation during the study period.The unused land area showed a trend of fluctuation and decrease during the study period.In 2000,2010 and 2020,the comprehensive land utilization degree of Yunnan Province was 2.1297,2.1326 and 2.1444,respectively,and the comprehensive land utilization degree of Yunnan Province showed an increasing trend.From 2000 to 2020,the land use map of Yunnan Province accounted for 85.88%,0.41%,5.47%,6.40%and 1.84%,respectively,of stable land use maps,continuous change,early change,late change type and repeated change type.Through the analysis of the importance of land use transformation,it is found that the direction of land use type transformation in Yunnan Province is more concentrated from 2000 to 2020,and cultivated land,forest land and grassland are the most important land types in land mutual conversion,and the importance of transformation is increasing.The importance of land-use conversion in watersheds,wetlands and unused lands has shown a trend of weakening.The comprehensive land use dynamics in 2000-2010,2010-2020 and 2000-2020 were 14.51%,13.14%and 9.61%,respectively,indicating that the activity of land use transformation in Yunnan Province was declining.From the perspective of spatial distribution,the number of land type changes in Yunnan Province varies significantly in the east-west direction,with Kunming City,Yuxi City and Honghe Prefecture and several prefectures and cities east of them changing more land,and Kunming City,Yuxi City and several prefectures and cities west of Honghe Prefecture changing relatively little.The equivalent factors of Yunnan Province in 2000,2010 and 2020 were 61960.24yuan/km~2,137565.86 yuan/km~2 and 187659.74 yuan/km~2,2010 and 2020,the total value of land ecological services in Yunnan Province was 415.778 billion yuan,927.129billion yuan and 1265.246 billion yuan.During the study period,the total ESV of 129county-level administrative units did not increase or decrease continuously or across levels,and the total ESV rating of 129 county-level administrative units in 2020 did not increase compared with the total ESV rating in 2000.The value provided by each service type in Yunnan Province was ranked in three periods,and the results showed that the highest value was soil formation and protection,and the lowest value was food production.In 2000,2010 and 2020,the average ecological service value of land per unit area in Yunnan Province was 1,081,800 yuan/km~2,2,412,200 yuan/km~2,and3,292,000 yuan/km~2,respectively.Compared with the number of county-level administrative units with the average ecological service value of 4 units in 2000,2010and 2020,it was found that the average ecological service value of land at the lowest level decreased by county-level administrative units.The spatial distribution of land ecological service value in Yunnan Province has a strong correlation,showing a spatial agglomeration distribution.In 2000,2010 and 2020,the proportion of areas with high and low land ecological service values was not significant.There were not low-high clustering in the three periods;High-high clustering,low-low clustering,and high-low clustering showed spatial clustering,and the distribution of the three types of districts and counties did not change much.The clustering pattern of high and low land ecological service value and the distribution pattern of cold and hot spots in Yunnan Province are similar,and the areas of high and low clustering basically correspond to the hot spots and cold spots.Based on the shortcomings of land ecological service value research in this paper,the future research direction of ecosystem service value assessment is discussed. |
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