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《不同耕作模式下坡耕地次降雨径流量及径流泥沙颗粒机械组成规律.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第26卷第2期水土保持学报Vo1.26No.22012年4月JournalofSoilandWaterConservationApr.,2012不同耕作模式下坡耕地次降雨径流量及径流泥沙颗粒机械组成规律邱野,王碹,李德利,王宇飞(1.沈阳农业大学水利学院,沈阳110866;2.铁岭市水利局,辽宁铁岭112000)摘要:为确定坡耕地在不同耕作模式下,次降雨坡面径流量及径流泥沙中土壤颗粒机械组成规律.在天然降雨条件下。采用1O。坡耕地,顺垄、横垄、免耕、秸秆覆盖耕作模式组合试验。结果表明:不同耕作模式试验小区的次降雨径流量顺序为裸地(LD
2、)>顺垄传统耕作(Ts)>顺垄免耕(NTs)>顺垄免耕秸秆覆盖(NTSs)>横垄传统耕作(Th)>横垄免耕(NTh)>横垄免耕秸秆覆盖(NTSh);不同耕作模式下,坡面流失的泥沙颗粒机械组成均不同,其中LD流失的沙粒含量最多,Ts流失的粉粒含量最少,NTSh流失的粘粒含量最多;不同耕作模式,坡面流失土壤颗粒级配较均匀地为LD、NTs、Th、NTh;不同耕作模式产生的地表径流中,粒径在0.25~O.06mm的土壤流失量最多,当粒组的范围>O.06mm时,各粒组不同处理方式的土壤流失量顺序均为NTSh3、4、ncy。ShenyangAgriculturalUniversity·Shenyangl10866;2.TielingWaterConservancyBureau。Tieling.Liaoning112000)Abstract:Inordertodeterminethelawaboutmechanicalcompositionofsoilparticlesizeintheslopefarmlandrunoffandsedimentunderdifferenttillagepatterns.Usingskimmingridge,hori5、zontalridgeandno—tillagesrawmulthingin10。farmlandtocompositetest.TheresultSshowthattheorderofrunoffindifferentcultivationmodeisasfollows:Bareframland(LD)>traditonalandskimmingridgefarmingmode(Ts)>no—tillageandskimmingridgefarmingmode(NTs)>no—tillagestrawmulchingandskimm6、ingfarmingmode(NTSs)>tra—ditionalandhorizontalridgefarmingmode(Th)>no—tillageandhorizontalridgefarmingmode(NTh)>no—tillagestrawmulchingandhorizontalridgefarmingmode(NTSh);underdifferenttillagemode,sedimentparticlesizecompositionofslopewaterandsoilconservationaredifferen7、t,thesedimentofLDsandparticlecontentissignificantlyhigherthanotherpattern,whichunderNTShtheclaycontentisthemostloss.The1eastlOSSaboutsiltcontentinsedimentiSunderTs.Underdifferenttillagepatterns,thedistributionofsandgraincompositionwasnarrowinslopesedimentinthesemodeasfo8、llows:LD,NTs,ThandNTh;thesur—facerunofffromdifferentfarmingmode,particlesizeinthe0.25~O.06mmlosesthemost,whent
3、4、ncy。ShenyangAgriculturalUniversity·Shenyangl10866;2.TielingWaterConservancyBureau。Tieling.Liaoning112000)Abstract:Inordertodeterminethelawaboutmechanicalcompositionofsoilparticlesizeintheslopefarmlandrunoffandsedimentunderdifferenttillagepatterns.Usingskimmingridge,hori5、zontalridgeandno—tillagesrawmulthingin10。farmlandtocompositetest.TheresultSshowthattheorderofrunoffindifferentcultivationmodeisasfollows:Bareframland(LD)>traditonalandskimmingridgefarmingmode(Ts)>no—tillageandskimmingridgefarmingmode(NTs)>no—tillagestrawmulchingandskimm6、ingfarmingmode(NTSs)>tra—ditionalandhorizontalridgefarmingmode(Th)>no—tillageandhorizontalridgefarmingmode(NTh)>no—tillagestrawmulchingandhorizontalridgefarmingmode(NTSh);underdifferenttillagemode,sedimentparticlesizecompositionofslopewaterandsoilconservationaredifferen7、t,thesedimentofLDsandparticlecontentissignificantlyhigherthanotherpattern,whichunderNTShtheclaycontentisthemostloss.The1eastlOSSaboutsiltcontentinsedimentiSunderTs.Underdifferenttillagepatterns,thedistributionofsandgraincompositionwasnarrowinslopesedimentinthesemodeasfo8、llows:LD,NTs,ThandNTh;thesur—facerunofffromdifferentfarmingmode,particlesizeinthe0.25~O.06mmlosesthemost,whent
4、ncy。ShenyangAgriculturalUniversity·Shenyangl10866;2.TielingWaterConservancyBureau。Tieling.Liaoning112000)Abstract:Inordertodeterminethelawaboutmechanicalcompositionofsoilparticlesizeintheslopefarmlandrunoffandsedimentunderdifferenttillagepatterns.Usingskimmingridge,hori
5、zontalridgeandno—tillagesrawmulthingin10。farmlandtocompositetest.TheresultSshowthattheorderofrunoffindifferentcultivationmodeisasfollows:Bareframland(LD)>traditonalandskimmingridgefarmingmode(Ts)>no—tillageandskimmingridgefarmingmode(NTs)>no—tillagestrawmulchingandskimm
6、ingfarmingmode(NTSs)>tra—ditionalandhorizontalridgefarmingmode(Th)>no—tillageandhorizontalridgefarmingmode(NTh)>no—tillagestrawmulchingandhorizontalridgefarmingmode(NTSh);underdifferenttillagemode,sedimentparticlesizecompositionofslopewaterandsoilconservationaredifferen
7、t,thesedimentofLDsandparticlecontentissignificantlyhigherthanotherpattern,whichunderNTShtheclaycontentisthemostloss.The1eastlOSSaboutsiltcontentinsedimentiSunderTs.Underdifferenttillagepatterns,thedistributionofsandgraincompositionwasnarrowinslopesedimentinthesemodeasfo
8、llows:LD,NTs,ThandNTh;thesur—facerunofffromdifferentfarmingmode,particlesizeinthe0.25~O.06mmlosesthemost,whent
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