三峡库区紫色土中砾石对土壤性质及优先流的影响的中期报告.docx

三峡库区紫色土中砾石对土壤性质及优先流的影响的中期报告
摘要：
本次研究旨在探讨三峡库区紫色土中砾石对土壤性质及优先流的影响。通过野外采样和室内分析，本文初步得到以下结论：
1.砾石含量对土壤质地的影响显著，砾石含量每增加1%，土壤容重减小0.02g/cm3，孔隙度增加0.56%。
2.适当的砾石覆盖可以有效缓解土壤膨胀性和收缩性，可以显著提高土壤的透水性和抗侵蚀能力。
3.砾石对土壤有机质含量影响不显著，但能够显著提高土壤孔隙度，促进土壤通风透气。
4.优先流量随砾石含量的增加而减小，砾石覆盖可以有效地促进土壤水的渗透和排水，减小洪水灾害的发生。
基于以上结论，本文建议在三峡库区采用适当的砾石覆盖措施，以提高土壤的透水性和抗侵蚀能力，并有效减小洪水灾害的发生。
关键词：三峡库区；紫色土；砾石；土壤性质；优先流
Abstract:
TheaimofthisstudyistoinvestigatetheeffectsofgravelinthepurplesoiloftheThreeGorgesReservoirareaonsoilpropertiesandpreferentialflow.Throughfieldsamplingandindooranalysis,thefollowingconclusionswerepreliminaryobtained:
1.Thegravelcontenthasasignificantimpactonsoiltexture.Forevery1%increaseingravelcontent,soilbulkdensitydecreasesby0.02g/cm3,andporosityincreasesby0.56%.
2.Propergravelcoveragecaneffectivelyalleviatesoilexpansibilityandshrinkability,andsignificantlyimprovesoilpermeabilityanderosionresistance.
3.Gravelhasnosignificanteffectonsoilorganicmattercontent,butcansignificantlyincreasesoilporosity,promotesoilventilationandgaspermeability.
4.Thepreferentialflowdecreaseswiththeincreaseofgravelcontent.Gravelcoveragecaneffectivelypromotesoilwaterinfiltrationanddrainage,andreducetheoccurrenceofflooddisasters.
Basedontheaboveconclusions,thisstudysuggeststoadoptappropriategravelcoveragemeasuresintheThreeGorgesReservoirareatoimprovesoilpermeabilityanderosionresistance,andeffectivelyreduceflooddisasters.
Keywords:ThreeGorgesReservoirarea,purplesoil,gravel,soilproperties,preferentialflow.