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ID:36791153
大小:1.19 MB
页数:38页
时间:2019-05-15
《大青山油松人工林蒸腾耗水特征的研究》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、摘要本文选择大青山区古路板和奎素林场为试验地,在2005~2006年的生长季,对30a生油松人工林蒸腾耗水时空变化规律及其影响因子进行了研究,主要结果如下:(I)对30a生油松径向不同深度的液流速率研究指出,形成层向内3em处最强(相对位点为0.45~0.50),南北两方位液流速率没有差异,运用树干胸径可进行林木耗水尺度扩展。(2)油松叶片蒸腾日进程曲线呈单峰和双峰两种类型,最大值出现在10:00~14:oo。油松树干液流速率的日进程总体呈单峰曲线,但有昼高夜低和昼低夜高两种类型。单叶蒸腾速率主要受光照强度、温度和水汽压亏缺大小的影
2、响,而树干液流速率还受20cm土壤温度、20~60em土壤含水量、林分密度的影响。(3)林分蒸腾耗水量随林分密度增加而增加,二者关系呈“S”型曲线。根据曲线临界点可得到林分的最优密度和最大密度。古路板林分最优密度和最大密度分别为1869株/hnl2和2958株/hm2,而奎素分别为1457株,hm2和2449株/hm2。研究为大青山前山地区油松人工林培育和经营管理提供决策依据,也可作为评价该区森林植被稳定性的指标,对于该区植被建设具有重要的理论和实践意义。关键词;大青山:油松;林分密度;树干液流;蒸腾耗水量StudyonCharac
3、teristicsoftheWaterConsumptionforTranspirationofPinustabulaeformisCarr.PlantationofDaqingMountainAbstractThetemporalandspatialvariationofwaterconsumptionfortranspirationandtheinfluencefactorsonitfor30aPinustabulaeformisCarr.plantationwereresearchedinGulubanandKuisutest
4、edareasinDaqingmountainingrowthseasonsfrom2005to2006.nlemainresultsshowedasfollows:O)Thesapflowvelocityindifferentradialdepthsofstemof30a尹tabulaeformisindicatedthepositionofthegreatestvelocitylocated3cmbelowcambium(therelativepositionWasO.45~O.50).andthesapflowvelocity
5、hadn’tobviousdifferencebetweennorthandsouthofstem.Usingsapflowvelocityandthebreastdiametercouldcalculatethewaterconsumptionofthestand.(2)ThedailycoursecurveforleaftranspimtionofPtabulaeformishadtwotypeswhichshowedtheonepeakandthedoublepeaksandthemaximaofleaftranspirati
6、onwerein10:00~14:00,whilethedailycoarsecurveforthesapflowvelocitygenerallypresentedthesinglepeakthatcouldbeinnightorinday.Theleaftranspirationwaseffectedobviouslybythesolarmdiafionintensity,airtemperatureandsaturationvapordeficit,andbesidesthemthesapflowvelocityofstemh
7、adtheeffectedfactorswhichwerethe20cmsoiltemperature,20-60cmsoilwatercontentandstanddensity.(3)‰waterconsumptionforWenspirationinthestandincreasedasthestanddensityincreased,andtherelationshipCBIWebetweenthemCanbeshowedas⋯S.Basedonthecriticalofthecurvethebestandthemaximu
8、mdensityofthePtabulaeformiplantationinDaqingmountaincouldbeobtained,andtheywererespectively1869stocks/haand2958stocks
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