Quality Grade and Distribution Environment Characteristics of Black Soil Land in The County of Linxi in Chifeng City
This paper studied the characteristics of Black Soil Land in the County of Linxi in Chifeng City in order to provide sci-entific basis for scientific management and sustainable utilization of Black Soil Land.Based on the GIS technology,16 evaluation indices were selected from six aspects of health status,site conditions,physical and chemical properties,soil nutrients,profile properties and soil management.Fuzzy mathematics and analytic hierarchy process were uesd to calculate the weight of each factor and evaluate the comments.Under the support of cultivated land resource management information system,the comprehensive in-dex of cultivated land productivity was calculated based on the evaluation unit chart.The cumulative frequency curve classifica-tion method was adopted to evaluate the Black Soil Land quality grade and the distribution environment characteristics in the County of Linxi in Chifeng City.The results showed that the Black Soil Land in the County of Linxi in Chifeng City was distributed in the first to the tenth grade.The areas of Black Soil Land from the first to the third grade were accounted for 39.93%of the to-tal Black Soil Land area in the County of Linxi in Chifeng City.Those from the fourth to the sixth grade were accounted for 26.52%of the total Black Soil Land area.The areas of Black Soil Land from the seventh to the tenth grade were accounted for 33.55%of the total Black Soil Land area.The environmental characteristics of Black Soil Land distribution in the County of Linxi in Chifeng City were as follows.The soil cleanliness were clean.The soil organic matter average content was 19.9 g/kg.The av-erage content of soil available phosphorus was 11.16 mg/kg.The average content of soil available potassium was 185 mg/kg.The 49.04%of the Black Soil Land terrain were plain middle level.The slope of 26.45%of the Black Soil Land were greater than 6°.The 36.64%of the Black Soil Land were not rich in biodiversity.The 35.93%of the Black Soil Land's irrigation capacity were not satisfied.In 21.55%of the Black Soil Land,the degree of farmland afforestation were low.The 66.53%of the Black Soil Land's drainage capacity were not satisfied.The soil obstacle factors of the Black Soil Land were soil desertification and soil salinization,which accounted for 11.34%and 23.37%of the total Black Soil Land area respectively in the County of Linxi in Chifeng City.
Black Soil LandQuality gradeSoil nutrientsObstacle factors
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