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1、2008年第5期季节性冻融期土壤剖面含水率变化特征研究122苑俊廷,陈军锋,郑秀清(1.东华理工大学土木与环境工程学院江西抚州344000;2.太原理工大学水利科学与工程学院山西太原030024)摘要:在干旱、半干旱气候区,采用野外田间试验和室内分析相结合的方法,分析了季节性冻融期土壤剖面含水率的变化特征,试验共设裸地(LD)、覆膜地(MD)和茬覆膜地(CMD)3种处理地块。结果表明,季节性冻融期土壤剖面含水率发生了明显的变化,在土壤剖面的不同深度出现了范围不等的含水率高值区和低值区,各处理地块含水率高值区变化的层
2、位、形成时间以及含水率达到相对稳定的深度均不同,其中CMD的聚墒区最大,含水率最高达22%;LD的聚墒区最小,含水率最高达21%,土壤剖面含水率由上到下为增大-减小-保持稳定的动态变化特点。研究结果对干旱和半干旱地区季节性冻融土壤储水保墒及高效利用土壤水资源、确定冬春灌溉合理灌水技术参数提供了参考。关键词:季节性冻融期;土壤剖面;土壤含水率;变化特征+中图分类号:S152.72文献标识码:A文章编号:10043268(2008)05005603ExperimentalStudyofSoilMoistureC
3、haracteristicsduringSeasonalFreezing-thawingPeriod122YUANJun-ting,CHENJun-feng,ZHENGXiu-qing(1.DepartmentofCivilEngineeringandEnvironmentalEngineering,EastChinaInstituteofTechnology,Fuzhou344000,China;2.CollegeofWaterResourcesScienceandEngineeringofTaiyuanUniv
4、ersityofTechnology,Taiyuan030024,China)Abstract:Inaridandsem-iaridclimateareas,thefieldexperimentsandindoorexperimentswerejontlyusedtoanalyzethesoilmoisturecharacteristicsofseasonalfreezingandthawingsoilinthepaper.Threekindsofsurfacetreatmentsweredesigned:non-
5、cultivatedbareplot(LD),plasticfilmmulchingplot(MD)andstubbleandplasticfilmdoublemulchingplot(CMD).Theresultsshowedthatthesoilmoisturechangedapparentlyduringseasonalfreezingandthawingperiod.Thehighermoisturecontentareasandlowermoisturecontentareasappearedindiff
6、erentdepthsofsoilprofile.Thevariablehorizonandtheformingtimeofhighermoisturecontentareas,andthedepthinwhichthesoilmoisturekeptstablewerealldifferentwitheachtreatment.ThelowestmoisturecontentareaisLD,about21%.Thedynamicchangeofsoilmoistureinprofilearein-creasin
7、g-reducing-maintainingstabilityfromthesurfacetothebottom.Theresultshadthetheo-reticalandpracticalmeaningsforconservingthesoilmoisture,utilizingthesoilwatereffectively,andconfirmingtheirrigationtechnicalparametersreasonablyforseasonalfreezingandthawingsoilwithi
8、nthewinterandspringirrigation.Keywords:Freezing-thawingperiod;Surfacetreatment;Soilmoisture;Varyingcharacteristics收稿日期:20071116基金项目:国家自然科学基金资助项目(40472132)作者简介:苑俊廷(1984),男,山西忻州人,在读硕
