施用给水厂残泥对土壤中草甘膦降解的影响
发布时间：2019-04-24 18:27
【摘要】：给水厂残泥(WTR)已被证实为安全废弃物,掺杂WTR能显著增强土壤对有机磷农药草甘膦的吸附容量与稳定性,与此同时,WTR的掺杂可能会进一步影响土壤中草甘膦的降解行为.本研究通过单次与重复施加草甘膦实验,从土壤中草甘膦及其代谢产物的残留特征、土壤酶活性和总菌丰度等3个方面,对比分析了WTR掺杂对土壤中草甘膦降解的影响.实验结果表明,单次施加草甘膦条件下,掺杂WTR不会影响草甘膦的降解,反而能降低草甘膦在降解过程中的迁移能力,缓解高浓度草甘膦对土壤磷酸酶和脱氢酶的抑制作用,提高土壤微生物丰度;短时间(21 d)内重复施加草甘膦会导致土壤中草甘膦与AMPA的积累,同时,掺杂WTR,特别是当掺杂量≥5%时,将造成草甘膦积累量进一步增加,但其在WTR土壤具有较高稳定性,二次释放风险小.总体而言,与短时间内频繁使用大量草甘膦的农业区相比,在施用草甘膦时间间隔较长的农业区,掺杂WTR能大大降低草甘膦在降解过程中由土壤向水体迁移的风险.
[Abstract]:(WTR) has been proved to be a safe waste in the residue of water supply plant. Doping WTR can significantly enhance the adsorption capacity and stability of glyphosate to organophosphorus pesticide in soil. At the same time, the doping of WTR may further affect the degradation of glyphosate in soil. The effects of WTR doping on the degradation of glyphosate in soil were studied by single and repeated application of glyphosate in three aspects: residual characteristics of glyphosate and its metabolites, soil enzyme activity and total bacterial abundance. The results showed that under the condition of single application of glyphosate, doping with WTR could not affect the degradation of glyphosate, but could reduce the migration ability of glyphosate in the degradation process, and alleviate the inhibition of soil phosphatase and dehydrogenase by high concentration glyphosate. Increase soil microbial abundance; Repeated application of glyphosate in a short period of time (21 days) would lead to the accumulation of glyphosate and AMPA in the soil, and the accumulation of glyphosate would be further increased by the addition of WTR, especially when the doping content was 鈮，
本文编号：2464681
[Abstract]:(WTR) has been proved to be a safe waste in the residue of water supply plant. Doping WTR can significantly enhance the adsorption capacity and stability of glyphosate to organophosphorus pesticide in soil. At the same time, the doping of WTR may further affect the degradation of glyphosate in soil. The effects of WTR doping on the degradation of glyphosate in soil were studied by single and repeated application of glyphosate in three aspects: residual characteristics of glyphosate and its metabolites, soil enzyme activity and total bacterial abundance. The results showed that under the condition of single application of glyphosate, doping with WTR could not affect the degradation of glyphosate, but could reduce the migration ability of glyphosate in the degradation process, and alleviate the inhibition of soil phosphatase and dehydrogenase by high concentration glyphosate. Increase soil microbial abundance; Repeated application of glyphosate in a short period of time (21 days) would lead to the accumulation of glyphosate and AMPA in the soil, and the accumulation of glyphosate would be further increased by the addition of WTR, especially when the doping content was 鈮，
本文编号：2464681
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