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Effects of Corn Straw on Physical and Chemical Properties and Enzyme Activity of Drilling Mud Contaminated Soil |
WANG Yu1,4 ,WANG Rongxing2,JIN Chunyu3,MA Xiulan1,SUN Fangyuan1,ZHANG Xiufang1** |
1.College of Resources and Environment,Jilin Agricultural University, Changchun 130118,China; 2. Central Station of Agricultural Environment Protection and Rural Energy Management of Jilin Province, Changchun 130033, China; 3.Jiangnan Town Agricultural Technology Promotion Station, Dunhua 133799, China; 4. Changchun Construction Engineering Quality Inspection Center,Changchun 130112,China |
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Abstract Taking drilling mud (N) contaminated soil as research object, the effects of different corn straw addition on soil enzyme activity and soil physical and chemical properties were studied by indoor culture test. The results showed that when drilling mud content is more than 30%, the total salt of soil is between 1.13-1.38 g/kg, which belongs to mild salinization; With the increase of the amount of straw (J), soil pH and total salt decrease, and when drilling mud content in soil is 50%, the pH of adding 5% straw (J5N50) treatment is 1.37 lower than that of non-added straw (J0N50), and the decrease of total salt is relatively small. The increase of straw addition can significantly increase soil organic carbon content, and the organic carbon content of J5N50 reaches 24.09 g/kg, 48.31% higher than that of J0N50. With the increase of straw addition, the activity of three enzymes in soil increases.The activity of three enzymes is positively correlated with total phosphorus, total nitrogen, available phosphorus and alkali hydrolyzable nitrogen in soil, and negatively correlated with soil pH and total salt. It indicates that the activities of the three soil enzymes can reflect the change rule of soil physical and chemical properties to a certain extent; There is no significant correlation between the three soil enzymes and soil organic carbon content.
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Received: 22 March 2018
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