Research and demonstration of cultivated land quality grade evaluation method based on AHP-CRITIC method
Cultivated land quality grade evaluation is a long-term and basic work in implementing the strategic deployment of"grain storage in land and grain storage in technology",which is of great significance in guiding cultivated land quality management,ensuring national food security and agricultural sustainable development.In order to accurately express the high dimension,complexity and nonlinear characteristics of cultivated land quality evaluation and improve the accuracy of cultivated land quality evaluation,this study used objective weighting method(Criteria Importance Through Intercriteria Correlation,referred to as CRITIC)to determine index weights,based on field investigation and detection data,combined with remote sensing and geographic information system optimization evaluation index assignment method.The cultivated land quality evaluation system was constructed from four aspects:landform,soil character,farmland management and ecological security,and the cultivated land in Hohhot city was taken as an example.The results showed that the average quality level of cultivated land in Hohhot was 5.84,which was at the medium level.The quality of cultivated land in the central part of Hohhot was better,followed by that in the northwest,and it was the lowest in the southeast.Poor soil,salinization and imperfect irrigation and drainage facilities were the main factors restricting the improvement of cultivated land quality.From the perspective of the spatial distribution of cultivated land quality grade,the area of high-level cultivated land at 1st-4th level was 111900 hm2,accounting for 20.13%;The area of medium quality cultivated land at 5th-7th was 356700 hm2,accounting for 64.14%;The area of low-level cultivated land at 8th-10th was 87500 hm2,accounting for 15.73%,and the overall distribution was basically conforms with normal distribution.The results of this study are basically consistent with the evaluation results of national standard method.It shows that the CRITIG evaluation method of cultivated land quality grade can accurately and objectively reflect the quality level of cultivated land,and can be effectively applied to the evaluation research of cultivated land quality grade in other areas.It is an important supplement to the existing cultivated land quality grade evaluation methods,and provides reference for the cultivated land quality evaluation in other areas.
cultivated land qualityobjective weighting methodevaluation methodHohhot city
NETL
NSTL
万方数据
