施用给水厂残泥对南北方不同类型农田土壤质量的影响

发布时间：2018-05-16 11:29

本文选题：给水厂残泥 + 土壤质量　；参考：《环境科学研究》2016年10期

【摘要】：为评估WTR(给水厂残泥)在农业区污染控制领域的土地应用风险,从土壤理化性质、土壤养分含量、有机质活性、微生物生长和土壤酶活性等五方面,考察了不同WTR添加量(w为0%、2%、5%、10%)对3个南北方农田(土壤)(常州水稻田、寿光和天津蔬菜种植区土壤,依次记做常州土壤、寿光土壤和天津土壤)质量的影响.结果表明:1WTR添加后,各土壤中CEC(阳离子交换容量)提高了23.7%~63.9%;添加WTR有利于调节酸性和碱性土壤p H,使之更适合作物生长,随着WTR添加量由0%增至10%,常州土壤p H由5.45升至6.69,寿光和天津土壤p H则分别由7.57、7.88降至7.26、7.64.2添加适量WTR不会造成土壤中P、K、Fe、Al、Ca、Mg、Cu、Mn和Zn等多种有效态元素含量的缺失,特别是在富P(50 mg/g)土壤中施加2%~10%的WTR,既能满足植物生长对有效P的需求,又能降低P的淋溶风险.3在施肥和不施肥条件下,WTR添加量≤5%时均能增加土壤w(活性有机质),促进土壤微生物生长,提高土壤脱氢酶和总磷酸酶活性.由于WTR对有机P底物的强吸附作用,不施肥条件下,WTR添加量达到10%时,土壤总磷酸酶活性降低了55%;而施加有机肥会削弱或抵消这种不利影响,土壤总磷酸酶活性可提高至未添加WTR时的1.7倍.因此,添加适量WTR能有效改善我国南北方不同类型农田土壤质量.
[Abstract]:In order to evaluate the risk of land application of WTR in the field of pollution control in agricultural areas, there are five aspects: soil physical and chemical properties, soil nutrient content, organic matter activity, microbial growth and soil enzyme activity. The effects of different amounts of WTR on the quality of three agricultural fields in the south and north (Changzhou paddy field, Shouguang and Tianjin vegetable growing area, recorded as Changzhou soil, Shouguang soil and Tianjin soil) were investigated. The results showed that the cationic exchange capacity of each soil increased by 63.9and that the addition of WTR could regulate pH in acidic and alkaline soil and make it more suitable for crop growth. With the addition of WTR from 0% to 10%, pH in Changzhou soil increased from 5.45 to 6.69, and soil pH decreased from 7.57 to 7.267.64.2 in Shouguang and Tianjin, respectively, and the addition of appropriate amount of WTR did not result in the loss of available elements such as Cu mn and Zn in soil. Especially in the soil rich in 50 mg / g, the application of 10% WTR can meet the needs of plant growth for available P, It also decreased the leaching risk of P when the addition of WTR was less than 5 under the condition of fertilization and no fertilization, it could increase soil w-( active organic matter), promote the growth of soil microorganism, and increase the activities of soil dehydrogenase and total phosphatase. Because of the strong adsorption of WTR to organic P substrates, the total phosphatase activity of soil decreased by 555g when the amount of WTR was 10 without fertilization, but the negative effect was weakened or counteracted by the application of organic fertilizer. The total phosphatase activity of soil increased to 1.7 times of that without WTR. Therefore, the addition of appropriate amount of WTR can effectively improve the soil quality of different types of farmland in the south and north of China.
【作者单位】：湖南省环境保护科学研究院水污染控制技术湖南省重点实验室;北京师范大学环境学院教育部水沙科学重点实验室;
【基金】：国家国际科技合作专项项目(2013DFG91190)
【分类号】：S141.6

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