砜吡草唑及其主要代谢物在土壤中的消解和对土壤酶活性的影响研究  

Exploring the degradation and soil enzyme impact of pyroxasulfone and its main metabolites in soils

作　　者：杜颂 汤涛[2] 程曦 赵学平[2] 张春荣[2] 梁晓宇 王萌 张震 李永成[1] 章程辉[1] DU Song;TANG Tao;CHENG Xi;ZHAO Xueping;ZHANG Chunrong;LIANG Xiaoyu;WANG Meng;ZHANG Zhen;LI Yongcheng;ZHANG Chenghui(College of Food Science and Engineering,Hainan University,Haikou 570228,China;Institute of Agro-Product Safety and Nutrition,Zhejiang Academy of Agricultural Sciences,Hangzhou 310021,China;College of Tropical Agriculture and Forestry,Hainan University,Haikou 570228,China;Key Laboratory of Quality and Safety Control for Subtropical Fruit and Vegetable,Ministry of Agriculture and Rural Affairs,Analysis and Test Center,Chinese Academy of Tropical Agricultural Sciences,Haikou 571101,China)

机构地区：[1]海南大学食品科学与工程学院,海南海口570228 [2]浙江省农业科学院农产品质量安全与营养研究所,浙江杭州310021 [3]海南大学热带农林学院,海南海口570228 [4]中国热带农业科学院分析测试中心,农业农村部亚热带果品蔬菜质量安全控制重点实验室,海南海口571101

出　　处：《浙江农业学报》2025年第4期847-857,共11页Acta Agriculturae Zhejiangensis

基　　金：国家市场监管重点实验室(热带果蔬质量与安全)基础应用及重点研究课题(ZX-2023001)。

摘　　要：砜吡草唑是新型异唑类芽前除草剂,已被登记在小麦上使用,但其主要代谢物M-1和M-3对土壤环境的风险尚不明确。本研究使用黑土、褐土、红土3种理化性质不同的土壤,研究了不同理化条件对砜吡草唑及其主要代谢物消解性的影响,以及砜吡草唑及其主要代谢物对土壤酶活的影响。结果表明,M-1和M-3在不同土壤中的消解速率低于母体,3种土壤培养120 d后,砜吡草唑的消解速率为12.3%~38.0%;M-1的消解速率为3.8%~4.6%;M-3的消解率为4.6%~21.0%。砜吡草唑易在高pH值和有机质含量高的土壤(黑土)中消解,M-1易在高阳离子交换量的土壤(黑土)中消解,M-3易在低pH值和有机质含量低的土壤(红土)中消解。土壤阳离子交换量和pH值是影响M-1和M-3消解的主要因素。同时,M-1和M-3均在母体消解过程中逐渐累积,3种土壤中M-1和M-3的总累积量分别占砜吡草唑消解总量的41.0%、27.2%、32.6%。M-1易在有机质含量高的环境中生成,而M-3易在高pH值环境中生成。对土壤酶活性的影响研究发现,砜吡草唑母体及其代谢物M-1和M-3对土壤酸性磷酸酶、β-葡萄糖苷酶、脲酶和脱氢酶等均具有明显的活性抑制作用,而且代谢物的抑制作用要强于母体。因此,在评估砜吡草唑对土壤的潜在风险时,需综合考虑砜吡草唑及其代谢物的生态风险,为农药的合理使用提供科学依据。Pyroxasulfone,a new isoxazole pre-emergence herbicide,is registered for use on wheat,but the risk of its main metabolites,M-1 and M-3,to the soil environment is not known.In this study,the effects of different physicochemical conditions on the elimination of pyroxasulfone and its major metabolites,as well as the effects of pyroxasulfone and its major metabolites on soil enzyme activities were investigated using three types of soils with different physicochemical properties,namely,black soil,brown soil,and red soil.The results showed that M-1 and M-3 were eliminated at lower rates than the parent in different soils,after 120 d of incubation in three soils,the elimination rates of pyroxasulfone ranged from 12.3%to 38.0%;those of M-1 ranged from 3.8%to 4.6%;and those of M-3 ranged from 4.6%to 21.0%.Pyroxasulfone is readily dissipated in soils with high pH value and high organic matter content(black soils),M-1 is readily dissipated in soils with high cation exchange(black soils),and M-3 is readily degraded in soils with low pH value and low organic matter content(red soils).Soil cation exchange and pH value were the main factors affecting the dissolution of M-1 and M-3.And both M-1 and M-3 gradually accumulated during the parent elimination process.The effect on soil enzyme activities was found that pyroxasulfone and its metabolites,M-1 and M-3,inhibited soil acid phosphatase,β-glucosidase,urease,and dehydrogenase activities,and the metabolites inhibited them more strongly than pyroxasulfone.Therefore,the ecological risks of pyroxasulfone and its metabolites need to be considered comprehensively when assessing the potential risk of pyroxasulfone to soil,so as to provide a scientific basis for the rational use of pesticides.

关 键 词：砜吡草唑 代谢物 消解动态 土壤酶活性 

分 类 号：X131.3[环境科学与工程—环境科学]