Evaluation Of Cultivated Land Fertility In Bayannaoer City

China’s per capita cultivated land area is small,the contradiction between people and land is very prominent.In order to strengthen the effective management of cultivated land and realize the sustainable development of resources and agriculture,We need to make rational use of cultivated land resources,so it is necessary to conduct a new evaluation of cultivated land productivity.Bayannaoer has rich cultivated land resources,is an important national high-quality grain and oil production base.Taking Bayannaoer City as the research area,based on the collection and collation of relevant data,The cultivated land fertility of Bayannur was evaluated by using 10 cultivated land fertility evaluation indexes,GIS technology,analytic hierarchy process(AHP),modulus and comprehensive evaluation method,curve cumulative grading method,etc.The results are as follows(1)Among the cultivated land in Bayannaoer City,the cultivated land areas of grade one to grade ten are 626.53 hm~2,28467.16 hm~2,17234.80 hm~2,37385.28 hm~2,105347.37hm~2,102136.00 hm~2,239852.76 hm~2,120901.18 hm~2,74324.77 hm~2 and 24257.53 hm~2respectively.Among them,grade seven is the largest,accounting for 32.83%of the total cultivated land area,while grade one and grade two are less,They accounted for 0.09%and 1.16%of the total cultivated land respectively.(2)The largest area of Urad Front Banner in Bayannur City is 22.36%of the city’s arable land,while the cultivated land area of Wulate rear banner is the smallest,accounting for only 1.75%of the whole city’s cultivated land.The quality of cultivated land in Wulat Middle Banner is high.All the first grade land,99.91%of the second grade land and90.17%of the third grade land are in Wulat Middle Banner.The quality of cultivated land in Wuyuan County is low,accounting for a large proportion of Grade 8,grade 9 and grade10.(3)Among the cultivated land in Bayannaoer City,92.35%of the total cultivated land is fully irrigated;The drainage condition is relatively poor;41.4%of the cultivated land showed different degrees of salinization;The cultivated land with groundwater level of 2-4m is the largest,accounting for 74.93%of the total cultivated land;85.40%of the cultivated land had accumulated temperature≥10℃in the range of 3300-3500℃;The area of cultivated land with proluvial parent material was the largest,accounting for53.39%;The texture configuration of 70.60%of cultivated land is whole soil.(4)The main soil type is irrigated and silted soil,and the cultivated area is 371268.16hm~2,accounting for 50.82%of the total cultivated area of the city;The second is saline soil,accounting for 27.12%of the total cultivated land area of the city;The third largest soil type is chestnut soil,accounting for 7.39%of the total cultivated land area of the city.(5)According to the standard of main nutrient abundance and deficiency,the average contents of organic matter,total nitrogen,alkali hydrolyzable nitrogen,total phosphorus,available phosphorus,total potassium and available potassium were 13.3 g/kg,0.81 g/kg,13.8 mg/kg,22.5 g/kg and 190 mg/kg,respectively Potassium is sufficient,phosphorus and organic quality is medium.On the whole,the average cultivated land fertility of the Bayannaoer is in the lower middle class.It has a good irrigation condition,but the degree of salinity is serious.It can be improved by improving drainage conditions and salinization of cultivated land.