The Variation Tendency of Wetland and its Conversion with Cropland in China from 2000 to 2020
To explore the impact of conversions between wetland and cropland on the wetland area of China,we analyzed the changes and distribution of wetland areas in China over the past 20 years by employing method of land use dynamic attitude,based on the land use data of 2000,2010,and 2020 in China.Then,we examined the impacts of conversions between wetlands and croplands on the overall wetland area changes by using land use transfer matrix.The results showed as follows:1)In 2020,the wetland area of China was 34.17x104 km2,and the marshland area was the largest.Approximately 56％～57％of the national wetlands were located in Tibet,Qinghai,Heilongjiang,and Inner Mongolia.2)From 2000 to 2020,the area of wetlands in China net increased by 5 600 km2,among which the conversions between wetland and cropland resulting in a net increase of 1 500 km2,contributing 27.48％to the total increase in wetland area.In the past 20 years,the largest increase in artificial/pond wetlands was 7 800 km2,among of 54.78％attributed to the conversion from cropland to wetland.Conversely,the largest decrease was in marshlands,totaling 3 300 km2,with 89.99％due to the conversion from wetland to cropland.3)Additionally,the conversion of wetlands into croplands was primarily marshland reclamation,with 42.57％concentrated in northeast China from 2000 to 2020.On the other hand,the conversion of cropland into wetlands mainly involved transforming them into artificial/pond wetlands.Wetland restoration efforts have expanded the total wetland area in China,while they have also resulted in the depletion of extensive natural wetlands with significant ecological functions,such as marshlands.
Wetland of ChinaVariation tendency of wetland areaDistribution patternConversions between wetland and cropland
NETL
NSTL
万方数据
