多重环境因子对氟胺磺隆在土壤中降解的影响

Effects of Multiple Environmental Factors on Triflulsulfuron-methyl Degradation in Soils

氟胺磺隆作为普遍使用的一种磺酰脲类除草剂,已经对土壤和作物造成了危害,其环境行为受很多物理化学或生物因素的影响.为探明不同环境因素对氟胺磺隆在土壤中降解程度的影响,通过实验室内模拟培养的方法,研究了土壤微生物、不同土壤类型、水溶性有机物(dissolved organic matter,DOM)、温度、土壤含水量等因素对氟胺磺隆在土壤中降解的影响.结果表明,各种环境因子:温度、湿度、土壤微生物和土壤类型等均在不同程度上影响了氟胺磺隆的土壤降解速率.土壤微生物量、土壤有机质和DOM的增加均有利于氟胺磺隆在土壤中的降解,并且土壤pH的降低,也会促进氟胺磺隆在土壤中的降解.其中,土壤微生物是影响氟胺磺隆土壤降解的主要因素.该研究结果将为一些生物和物理化学因子调节氟胺磺隆在土壤中消散提供初步数据.

Triflulsulfuron-methyl,a widely used sulfonylurea herbicide,has done harm to the soil and crop.Its environment fate was affected by many factors such as physicochemical or biological factors.In order to understand the effects of different environmental factors on the degradation of triflulsulfuron-methyl in soil,simulated indoor incubation experiments were carried out to explore the effects of soil microbe,soil type,dissolved organic matter（DOM）,temperature,and soil moisture on triflulsulfuron-methyl degradation in soils.The results showed that different environmental factors such as temperature,soil moisture,soil microorganisms and soil type influenced triflulsulfuron-methyl degradation in different degrees.The increased soil microbial biomass,soil organic matters and DOM were beneficial to the soil degradation of triflulsulfuron-methyl,meanwhile,the decrease in soil pH could accelerate its degradation in soils.The results showed that soil microorganisms were the main factor effecting the degradation of triflulsulfuron-methyl in soil.Our results provided initial data for the conclusion that a set of biological and physiochemical factors coordinately regulate the decay of triflulsulfuron-methyl in soils.