Evaluation of cultivated land productivity in Hetao Plain of upper reaches of the Yellow River based on CRITIC-GRA-TOPSIS method
In order to better understand the cultivated land productivity and main obstacle factors in Hetao Plain of upper reaches of the Yellow River,and improve the quality of cultivated land and promote agricultural development,seven typical areas of Xidatan,Huinong,Xingqing,Helan,Nongken in Ningxia,Wuyuan and Hangjinhou in Inner Mongolia were taken as the study areas.From six dimensions of site conditions,profile characteristics,soil physical and chemical properties,soil salinization,nutrient status,soil management,the cultivated land productivity evaluation index system in Hetao Plain of upper reaches of the Yellow River was established.The cultivated land productivity evaluation was carried out by using the criteria importance through intercriteria correlation(CRITIC),grey relation approximation combined with the technique for order preference by similarity to ideal solution(GRA-TOPSIS),and the rank-sum ratio(RSR)method.The obstacle degree model was introduced for quantitative analysis of obstacle factors.The results showed as follows:1)The comprehensive indexes of cultivated land productivity in the study areas ranged from 0.293 to 0.647.The comprehensive indexes of cultivated land productivity of the 7 typical areas were 0.476-0.627,0.293-0468,0.418-0.571,0.365-0.501,0.377-0.543,0.414-0.578 and 0.428-0.647,respectively;2)On the whole,the cultivated land productivity in the study areas were mostly at a moderate level.The total cultivated land area of grade 3 and grade 4 was 4 273.06 hm2,accounting for 75.16％of the total cultivated land area.The total cultivated land area of grade 1 and grade 6 was 229.08 hm2,accounting for only 4.03％of the total cultivated land area.From the perspective of each district,there were some differences in the cultivated land productivity in 7 typical areas.The cultivated land productivity of Xidatan typical area was the best,with an average productivity of 2.43.Huinong typical area had the lowest grade of cultivated land productivity,with an average productivity of 5.06.The other 5 typical areas were basically in the medium productivity;3)The main obstacle factors of cultivated land productivity in 7 typical areas were different,including soil texture profile,plough layer texture,irrigation capacity,effective soil layer thickness,drainage capacity,ground-water table,organic matter content,soil salinization degree,available phosphorus,parts of the terrain,cation exchange capacity,which had obvious hindrance to the improvement of cultivated land productivity.Reasonable and efficient measures should be taken to give priority to reducing the main obstacle factors,when improving cultivated land productivity.In conclusion,this study can provide reference for the improvement of cultivated land productivity in Hetao Plain of upper reaches of the Yellow River,and provide research ideas for the evaluation of cultivated land productivity and obstacle factor analysis in other areas.
Hetao Plaincultivated land productivityCRITIC methodGRA-TOPSIS methodRSR methodobstacle factors
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