稻麦两熟农田茬口衔接期养分径流流失特征.pdf

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1、第26卷第4期水土保持学报V01．26NO．42012年8月JournalofSoilandWaterConservationAug．，2012稻麦两熟农田茬口衔接期养分径流流失特征郭智，周炜，陈留根，郑建初(江苏省农业科学院农业资源与环境研究所，南京210014)摘要：采用田间小区定位试验研究自然降雨条件下稻麦两熟农田“稻季一麦季一稻季”茬口衔接期养分径流流失规律。结果表明：麦季常规施肥条件下麦稻茬口衔接期径流水量达77．59m。／hm，径流侵蚀泥沙量达48．30kg／hm。，麦季少免耕处理较常规施肥处理增加径流水

2、量达41．41％；径流水氮磷浓度分别达2．22，0．46mg／L，径流侵蚀泥沙氮磷浓度分别达1．15。1．65g／kg；麦稻茬口衔接期氮素径流流失量达227．84g／hm。，以径流水流失为主，占氮素总径流流失量的75以上；磷素径流流失量达115．57g／hmz，以径流侵蚀泥沙流失为主，占磷素径流流失总量59以上；麦季秸秆还田、秸秆还田减肥处理减少麦稻茬口衔接期氮素和磷素径流流失量分别达6．04～9．74和5．73％～l1．54，而麦季少免耕处理则增加21．75和l3．42。关键词：氮；磷；径流；侵蚀泥沙；养分流失中图

3、分类号：$157．1文献标识码：A文章编号：1009—2242(2012)04—0086—04CharacteristicsofSurfaceRunoffLossesofSoilNitrogenandPhosphorusDuringtheRice-Wheat-RiceConnectionPeriodsinIntensiveRice—WheatRotationFieldGUOZhi，ZH0UWei，CHENLiu—gen，ZHENGJian—chu(InstituteofAgriculturalResourceandE

4、nvironment，JiangsuAcademyofAgriculturalScience，Nanjing210014)Abstract：Fieldplotexperimentwascarriedouttostudythecharacteristicsofsurfacerunofflossesofsoilnitrogenandphosphorusduringtherice—wheat—riceconnectionperiodsinintensiverice—-wheatrotationfieldundernatur

5、alrainfallconditions．Theresultsshowedthatthetotalvolumeofsurfacerunoffwaterandthequantityofsedimentbysurfacerunoffreached77．59m。／hm。and48．30kg／hm。undertheconventionalferti—lizationtreatment(T0)duringthewheat—riceconnectionperiod．And，notillagetreatment(T4)during

6、thewinterwheatgrowingseasonincreasedthevolumeofrunoffwaterby41．41，comparedwithTO；totalnitrogen(TN)，totalphosphorus(TP)concentrationsintherunoffwaterreached2．22，0．46mg／L，and，theyreached1．15，1．65g／kginthesedimentbysurfaceruno{f，respectively．Furthermore，underTOcon

7、di—tions，thetotalquantitiesofTNandTPlossesbysurfacerunoffreached227．84，ll5．57g／hm，respective—ly．Amongwhich，morethan75ofTNlosswasattributedtorunoffwater，andmorethan599／6ofTPlosswasattributedtothesedimentbysurfacerunoffduringthewheat—riceconnectionperiod；compared

8、withTO，ricestrawapplication(T1)，wheatstrawreturnandreducingfertilizertreatment(T2)duringthewinterwheatgrowingseasondecreasedTNandTPlossesby6．04～9．74％and5．73～11．54，however，T4