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ID:36773401
大小:2.85 MB
页数:41页
时间:2019-05-15
《大青山油松人工林土壤物理特征及水分动态研究》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、摘要本文对大青山阳坡油松人工林地土壤物理特性和土壤水分动态进行了研究,主要研究结果如下:(1)林地土层厚度为30cm一--90cm。林地土壤石含量表层土壤为50.18%"--71.71%,A层为46.55%~69.19%,B层为38.63%"-'73.69%,C层44.48%~71.13%。(2)阳坡油松人工林地土壤容重随土壤深度的增加而增加,总孔隙度、最大持水量、田间持水量,随土壤深度的增加而降低。当林分密度为2421---,3116株/公顷时,土壤容重1.25g/cm3~1.32g/cm3,总孔隙度49.92%,--,
2、52.71%,最大持水量30.81%,---,36.28%,田间持水量19.0%---24.42%之间。该密度范围的林分土壤容重较小,总孔隙度、最大持水量和田间持水量较大。林分密度为2421株/公顷'--,3116株/公顷林地的20cm、40cm和60cm深土壤饱和导水率随着林分密度的增加呈增加的趋势,其值大于其它密度林地的土壤饱和导水率。(3)林木生长初期4,-,-.5月份和生长末期8,-.-9月份:林地表层"--60cm深土壤含水量垂直变化都随土层的增加而增加;林分密度为2421-'--3116株/公顷时林地土壤含水量
3、随林分密度增加而增加的趋势。当林分密度为2421"-'3116株/公顷时:4-'-5月份,土壤含水量表层-'一60cm层变化为7.23%~10.97%;8~9月份时其土壤含水量表层~60cm层变化为9.O%~11.82%。关键词:大青山;油松人工林;土壤物理特性;土壤水分;林分密度StudyontheSoilPhysicalCharacteristicsandSoilWaterDynamicsofPinustabulaeformisPlantationofDaqingmountainAbstractThesoilphysi
4、calcharacteristicsandsoilwaterpynamicsofoinustabuleaformisplantationwerestudiedsolarslopeofDaqingmountain.theresultsshowedthat:(1)thethicknessofthesoillayerwas30~90cn,thesoilgravelcontentwas50.18%---.71.71%insurfacelayer.whichWas46.55%"-'69.19%inAlayer,38.63%"-'73
5、.69%inBlayerand44.48%"--71.13%inClayer.(2)Thevolumeweightincreasedwiththeincreaseofsoildepth,thesoiltotalporosity,maximumwaterholdingcapacityandfieldcapacitydecreasedwiththeincreaseofsoildepth.,nlevolumeweight,thesoiltotalporosity,themaximumwaterholdingcapacityand
6、fieldcapacityWas1.259/cm’~1.329/cm’,49.92%~52.71%,30.81%'-36.28%and19.0%'-24.42%respectivelywhenthedensityofplantWasbetween2421stubs/hmzand316stubs/bin。.Thevolumeweightoftheplantwaslower,thehigherthesoiltotalporosity,themaximumwaterholdingcapacityandfieldcapacity.
7、Thesoilstaturatedhydraulicconductivityincreasedasthestanddensityincreasedin20cm,40cm,60cmsoildepth,whenthedensityofplantWasbetween2421~316stubs/hrn2anditsvaluewashighertheotherdensityofplantofthesoilstaturatedhydraulicconductivity.(3)WhenthedensityofplantWas2421"-
8、-316stubs/hmz:thesoilwatercontentbetweensurfaceand60cmlayerwas7.23%~10.97%intheinitialgrowingphase(April—May)and9.0%~11.82%inlattergrowingphase(August—s
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