大青山油松人工林地土壤水分特征研究

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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