Effects Of Agricultural Land Consolidation On Regional Ecosystem Services

Agricultural land consolidation is one of the most largest human activities in china and that would affect ecological environment.It is of great significance to explore the impact of agricultural land consolidation on regional ecosystem services.This study would promote the balance,efficiency and stability of the ecosystem services in the agricultural land consolidation area.This research took Jianxi River Basin which in Fujian province as case study area.The data are remote sensing data,the agricultural land consolidation project data,land use data and so on.And the main research methods used in this article include field survey,literature analysis,spatial analysis,model simulation method,statistical analysis method.This study analyzed the dynamic changes of landscape before and after the agricultural land consolidation,assessed the impact of agricultural land consolidation on the ecosystem services and the relationship between ecosystem services which are crop production,carbon storage,and soil conservation.This study also revealed the factors affecting ecosystem services and the relationship between ecosystem services in agricultural land consolidation projects.Finally,based on the integration study of a variety of ecosystem services,this paper puts forward some suggestions on the optimization and control of agricultural land consolidation project.The main conclusions are as follows:(1)The area of cultivated land,urban villages,industrial and mining land and transportation land area in the Jianxi Watershed in 2016 increased,and the other landscape types showed a decreasing trend.From 2010 to 2016,the proportion of cultivated land,which was distributed at an altitude of less than 300m,gradually decreased.The increase of cultivated land through land consolidation is mainly in the area above 300m above sea level.The agricultural land consolidation will merge the small patch cultivated land in the watershed into large patches.After land consolidation,the landscape patches in the watershed became more regular,the landscape diversity decreased,and the ecological risk index decreased.(2)Compared with 2010(before land consolidation),the crop production and soil conservation services in the Jianxi Watershed increased in 2016(after land consolidation),but the carbon storage service decreased.The trade-off and synergy relationship between three ecosystem services have changed significantly through the consolidation of agricultural land.(3)The change of crop production service is closely related to temperature,rainfall,soil organic matter,effective soil layer thickness,investment per unit area,earthwork leveling,new field road and new irrigation system.The change of carbon storage service has a significant correlation with temperature,project area,investment volume,new cultivated land area,earthwork leveling,reconstruction of field roads,reconstruction production roads,new field roads and new production roads.The soil conservation service has a significant correlation with rainfall,slope,new land area,earthwork formation,topsoil stripping and backfilling,reconstruction of field roads,reconstruction production roads,new field roads and new production roads,new drainage system,new roller number,new flush protection bank.(4)The increase of temperature,humidity,slope,height,unit area investment,earthwork leveling and new drainage system can reduce the trade-off between grain production and carbon storage.The increase of percentage of sunshine,humidity,soil organic matter,soil depth,the project area,the rate of new arable land,new drainage system,the new roller number,new flush protection bank can reduce the trade-off between crop production and soil conservation.The increase of humidity,additional land out rate,earthwork leveling,topsoil stripping and backfilling,the new roller number,new flush protection bank can reduce the trade-off between carbon storage and soil conservation.(5)The total amount of key ecosystem services has a critical point in terms of the area of the project area,the investment per unit area,the new field road,the new production road and the new irrigation system.At the critical point,the total value of the key ecosystem services reaches the maximum.The critical point of the project area,investment per unit area,new field road,new production road and new irrigation system is 121.81 hm2,4262 yuan,1.91 km,0.618 km and 34.20 km,respectively.(6)Considering the capital investment and the area of the project area,combined with the critical point data and the multiple regression models of influencing factors and ecosystem services,we can estimate the ecosystem service improvement value,and adjust the agricultural land consolidation measures appropriately according to the consolation target.