麦草畏和2，4-滴二甲胺盐在天然草原土壤和牧草中的消解动态研究

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关键词：麦草畏；2，4-滴二甲胺盐；天然草原；土壤；牧草；消解动态

中图分类号：S812.6 文献标志码：A 文章编号：2097-2172（2025）09-0866-07

doi：10.3969/j.issn.2097-2172.2025.09.015

Degradation Dynamicsof Decamba and 2，4-D dimethylamine Salt intheSoilandPastureofNaturalGrasslands

WANG Yuling，NIU Shujun， ZHAO Feng，YU Haitao， ZHANG Xinrui， HU Guanfang （Institute of Plant Protection， Gansu Academy of Agricultural Sciences，Lanzhou Gansu 73Oo7o， China）

Abstract：Combination of decamba and 2，4-D dimethylamine salt can control many species of poisonous weeds including Ligulariavirgaueainnatualgrassans.ThesafegazingintervalafterhrbicideapplicationiscrucialforlivestocksaetyInder to ensuresafegrazing intervalafterherbicidesapplicationandprovidereferenceforestablishingthemaximumresiduelimit （MRL） standards of pesticides，the degradation dynamicsof 480g/L dicamba aqueous solutionand 55% 2，4-D dimethylamine salt aqueous solutioninsoilandforageofaturalgalandinLuquGansuereivestigatedusingultraigpefoaneliqudhoatoa tandemmassspectrometry.Resultsshowed thatthedissipation dynamicsofboth 48Og/Ldicambaaqueous solutionand 55% 2，4-D dimethylaminesaltaqueoussolutioninsoilandforagefolowedthefirstorderkineticequation.Thehalf-livesinsoilwere.8and 4.7d，respectielyileoeinagere6d.6dspecivelyorovegdambueussutio more rapidly in soil and forage than 55% 2，4-D dimethylamine salt aqueous solution，although both were easily degradable herbicides.BasedontheresiduelevelsofthesetwoherbicidesinforageandtheevaluationagainstdomesticandinternationalMRL standards，itissuggested that grazing can besafelycariedout3Oto 45d afterspraying theherbicidemixture of 480g/L dicamba aqueous solution + （204号 55% 2，4-D dimethylamine salt aqueous solution in natural grasslands to control dominant poisonous weeds such as Ligularia virgaurea.

Key Words： Dicamba; 2，4-D Dimethylamine salt; Natural grassland; Soil; Forage; Degradation dynami

天然草原是畜牧业发展的物质基础，也是维持自然生态平衡的重要成分[1]。（剩余10253字）