Potential of Cultivated Land Quality Based on Combination of Grading Factors and Matter Element Analysis

ZHAO Dongling;LIN Shangwei;YANG Jianyu;ZHANG Chao;HE Shanshan;ZHANG Tingting;College of Information and Electrical Engineering,China Agricultural University;Key Laboratory for Agricultural Land Quality Monitoring and Control,Ministry of Land and Resources;

potential of cultivated land quality;;matter element analysis;;reformed factor combination;;Zhuozhou City;;land consolidation

Calculation of cultivated land quality potential is an important content of land consolidation project. In order to scientifically calculate the quality of cultivated land remediation potential and arrangement of land consolidation project,based on the analysis of the influence factors of agricultural land classification and the establishment of a set of evaluation index system of land use coefficient,the potential of cultivated land quality was evaluated from two aspects of natural quality and utilization quality. Zhuozhou City of Hebei Province was taken as a case study for the method. After analyzing the previous achievement of agricultural land classification,by using the improved factor combination method and the three qualified convertible grading factors based on classification,eight types of convertible restriction factor combinations were found. The irrigation guarantee rate and soil organic matter content were determined as the limiting factors of cultivated land quality. According to the adaptability of each limiting factor,the lifting scheme was worked out. Then,in the second step,according to the actual situation of the study area,each index which was closely related to the level of land use was analyzed.The three factor layers, including the spatial pattern of cultivated land, the level of cultivated convenience,and the level of infrastructure in the field were included,which included the following eight indexes. Based on the analytic hierarchy process(AHP),the weights of each index were calculated,and the indexes were normalized to eliminate the dimension. Then the land use level of each grid and the difference of different utilization levels were calculated by the matter element analysis. Finally,with the study of existing land remediation engineering experience and technology of GIS or RS to enhance the level of each factor,and then the land use coefficient,the natural quality index and the utilization quality index were calculated,besides,the differences of natural quality index and utilization quality index were calculated before and after remediation,at the same time the result was analyzed. The result showed thatboth natural and utilized grade of the area can be improved after the implementation of land consolidation project. The average improvement value of provincial indices of natural and utilization levels were 174 and 167,respectively. The provincial natural quality grade was promoted by an average of 0. 87,and the provincial utilized grade was improved by an average of 0. 83. After converting the provincial grade into national grade,the national natural quality grade was improved by an average of 0. 53,and the national utilized grade was improved by an average of 0. 73. The new ideas and methods of prediction of cultivated land quality potential were explored. The results provided guidelines for the evaluation of cultivated land potential and the selection of index system,and provided the reference for quality evaluation of cultivated land.