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ID:36747604
大小:1.29 MB
页数:42页
时间:2019-05-14
《大青山油松人工林地土壤水分特征研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要本文对大青山阴坡中部油松人工林地土壤水分、物理特性及林冠截留等进行了研究,主要研究结果如下:(1)林地土层厚度为35cm~104cm。林地土壤石砾含量表层为59.21%~71.88%;土壤A层为53.24%~79.83%,B层为47.35%~67.13%。(2)林地土壤田间持水量、土壤容重和土壤总孔隙度,当林分密度为2933~3307株/hm。时,其分别为23.60%~26.90%,1.2l~1.3l和53.16%~53.68%;当林分密度为2202株/hm2和4463株/hm2时,其分别为22.88%~23.04%,1.39~1.42,48.68%~49.37%。2
2、0cm深土壤饱和导水率随着林分密度的增加呈降低趋势,而40cm深土壤饱和导水率随着林分密度的增加呈上升趋势。(3)表层到40cm层土壤含水量变化范围为,当林分密度为2933~3307株/搿时,旱季为5.87%~7.24%,雨季为12.60%~13.00%;当林分密度为2202株/h寸和4463株/hm2时,旱季为4.69%~5.98%,雨季为14.40%~14.83%。(4)各林地的林冠截留量、林内降雨量以及地表径流量随着林分密度变化不明显。降雨量大于16.3m时,随着林分密度的增大树干径流呈增大趋势。关键词:大青山;油松人工林;土壤水分;林冠截留;地表径流Studyon
3、theSoilWaterOmmzteristicsofPmustabulaefonnisPlantationofDaqingMountainAbsttactThesoilwatercharacteristics,thesoilphysicalcharacteristicsandthecanopyinterceptionofPinustabulaeformisplantationwerestudiedinthemiddleshadyslopeofDaqingMountain.Theresultsshowedthat:(1)Thethicknessofthesoillayer
4、was35—104cm.ThesoilgravelcontentWaS59.21%~71.88%insurfacelayer,whichwas53.24%~79.83%inAlayerand47.35%~67.13%inBlayer.(2)Thefieldcapacity,thevolumeweightandthesoiltotalporositywas23.60%~26.90%.1.21~1.31and53.16%~53.68%respectivitily,whenthedensityofplantWaSbetween2933stubs/hm2and3307stubs/
5、hm2,whichwas22.88%~2304%,1.39~1.42and48.68%~49.37%respectivitilywhenthedensityofplantwas2202stubs/hmzor4463stubs/bin2.Thesoilsaturatedhydraulicconductivitydecreasedasthestanddenskyincreasedin20cmsoildepth.Thetrendin40cmsoildepthwasopposffe.(3)Whenthedensityofplantwas2933~3307stubs/hm。,the
6、soilwatercontentbetweensurfaceand40cmlayerwas5.87%~7.24%indryseasonand12.60%~13.00%inrainseason.Whenthedensityofplantwas2202stubs/hm2or4463stubs/hm2,thesoilwatercontentbetweensurfaceand40cmlayerwas4.69%~5.98%indryseasonand14.40%~14.83%inrainseason.“)Thechangeofthecanopyinterception,thepre
7、cipitationinforestandthesurfacemnoffwam’tobviouswhenthestanddensitychangedWhenprecipitationwasmorethan16.3innl.thestemflowincreasedwiththestanddensityincrease.Keywords=DaqingMountain;Pinustabulaeformisplanation;Soilmoisture,"Canopyinterception;SurfacerunoffDirettedb
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