长沙县典型稻区灌溉沟渠水体重金属污染状况及风险特征

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中图分类号：X824 文献标识码：A 文章编号：1006-060X（2025）03-0047-05

引用格式：，.长沙县典型稻区灌溉沟渠水体重金属污染状况及风险特征[J].湖南农业科学，2025（3）：47-51.DOI：10.16498/j.cnki.hnnykx.2025.003.009

TheHeavy Metal Pollution Status and Risk Characteristics of Water Bodies of Irrigation Ditches in Typical Rice Areas of Changsha County

ZHOU Jie1， ZHOU Jing-ming²

（1.HunanEastongtingLkeNtioalatureReserveAdministratio，Yueyang44o，C;2.YueyangAademyofAlual Sciences，Yueyang 41400o，PRC）

Abstract：TakingwaterbodiesofirigationditchesintypicalriceareasofChangsha CountyinHunan Provinceastheresearch object，haracteristicsofavmetalotentinaterodiesofiigationdihesuringnoalaterprod，lowaterodnd highwaterperderemooedndissssmntasaedut，ostrovidebsisforioallandgawater and water body environment risk management.The results showed that the contents of Cd，Pb，As， H g and in the water bodies of irrigationditchesof8townsinChangsha Countydidnotexcedthelimit valueofthefarmlandigation waterqualitystandard（GB 5084—2021），and all showed thecharacteristicsofhighwaterperiod > normal water period ≈ lowwater period.The single factor polutionindex andomprehensivepoutionidexof5kindsofeavymetalsinwaterbodiesof irgationditches inthesudyarea duringnormal waterperiod，lowwaterperiodandhighwaterperiodshowedthatheywereclean，andthepollutionrisksofAsand Cd wereelativelyhigh.Hence，elevantsuggestionswereputforward：thedisturbancetothesedimentofigationditcesshouldbe minimizedinagriculturalproductionirigation，andthefoodafterheavyrainshouldbe preventedfromenteringfarmlandasmuchas possible， so as to reduce the risk of heavy metal pollution in irrigation water.

Key words：irrigation water;heavy metal; pollution risk; rice; Changsha County

重金属作为一种持久性污染物，具有难降解、易积累、毒性大等特性，主要通过灌溉水、大气干湿沉降、农业投入等途径进入农田。（剩余7025字）