Ecological Quality Evaluation And Improving Countermeasures Of Cultivated Land In Gully Region Of Loess Plateau

The gully region of the Loess Plateau is a traditional agricultural production area in China.Due to the semi-arid and semi humid climate and the landform with vertical and horizontal gullies,the soil erosion in this region is serious and the ecological environment is very fragile.Coupled with the long-term unreasonable development and utilization,the local ecological environment has been damaged,soil erosion and agricultural non-point source pollution have intensified,which seriously threatens the safety of agricultural ecological environment.At the same time,there are still deficiencies in the evaluation of cultivated land ecological quality in China,and there is a lack of comprehensive evaluation of cultivated land ecological quality.Therefore,it is urgent to evaluate the regional cultivated land ecological quality,build a systematic cultivated land ecological quality evaluation system,and put forward targeted countermeasures and suggestions according to the regional reality.This study constructs the theoretical framework of cultivated land ecological quality evaluation in the gully area of the Loess Plateau,establishes the cultivated land ecological quality evaluation method system,takes Changwu County as an example to study the application of cultivated land ecological quality evaluation system and the division of regulation areas,reveals the spatial distribution rules of cultivated land ecological quality,and puts forward differentiated cultivated land ecological quality management countermeasures,so as to provide a reference analysis framework for the study of cultivated land ecological quality in the gully area of the Loess Plateau,It provides a theoretical basis for cultivated land ecological management.Firstly,it clarifies the connotation of cultivated land ecological quality,puts forward the evaluation idea of cultivated land ecological quality combined with "total score",constructs the evaluation system of cultivated land ecological quality of "element process fractal ecological quality comprehensive ecological quality",determines the fractal dimension and evaluation index set of cultivated land ecological quality,determines the weight of evaluation index combined with subjective weighting method and objective weighting method,and superimposes the fractal dimension ecological quality with the background quality of cultivated land,Expand from single dimension to multi dimension to reflect the ecological quality of cultivated land.Secondly,using GIS data analysis technology,this paper makes an empirical study on Changwu county:(1)the background quality index of cultivated land in Changwu county is concentrated between 70.31 and 76.94,and the background quality index of cultivated land in the north is lower than that in the South as a whole.(2)The ecological quality of soil and water loss dimension of cultivated land in Changwu county is mainly "healthier" cultivated land,with an area of 13604.34 hectares,accounting for 92.73% of the total cultivated land area.The ecological quality of soil health dimension is mainly "less healthy" cultivated land,with an area of 11330.80 hectares,accounting for 77.23% of the total cultivated land.In the dimension of landscape ecology,the ecological quality is dominated by "less healthy" and "healthier" cultivated land.The area of "less healthy" cultivated land is 6212.76 hectares,accounting for 42.35% of the total cultivated land area,and the area of "healthier" cultivated land is 5786.48 hectares,accounting for 39.44% of the total cultivated land area.(3)The comprehensive ecological quality of cultivated land in Changwu county is mainly "unhealthy" and "less healthy".The area of "less healthy" cultivated land is 7408.58 hectares,accounting for 50.50% of the total cultivated land area,and the area of "unhealthy" cultivated land is 6178.53 hectares,accounting for 42.11% of the total cultivated land area.Finally,according to the evaluation results of cultivated land ecological quality in Changwu County,the research on cultivated land ecological regulation zoning is carried out,and the "priority guidance zoning" method of cultivated land ecological regulation zoning is established.This paper puts forward the differentiated ecological quality improvement and Management Countermeasures of cultivated land in Changwu county.Put forward common management countermeasures for the overall ecological quality of cultivated land in the region,and put forward differentiated management countermeasures for different cultivated land ecological regulation areas.