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1、应用生态学报2011年7月第22卷第7期ChineseJournalofAppliedEcology,Ju.l2011,22(7):1659-1667*秦岭山地油松群落更新特征及影响因子12**111康冰王得祥崔宏安迪玮峙杜焰玲12(西北农林科技大学生命科学学院,陕西杨凌712100;西北农林科技大学林学院,陕西杨凌712100)摘要采用样方法,对秦岭山地油松次生林群落更新特性和相关环境因子进行了研究.结果表明:油松次生林更新层乔木树种共36种,占总种数的5114%;优势种有短柄枹栎、锐齿栎和榛子等;幼苗库丰富,高度级及龄级较小;更新方式以实生为主,该森林群落处于演替中-2期、林分密度对林
2、下乔木幼苗、幼树数量影响极显著(P<0101),当林分密度从580株#hm-2增加到1500株#hm时,林下更新的幼苗、幼树密度呈增加趋势,随着林分密度的继续增加,其密度逐渐减少;坡向对幼苗、幼树密度的影响显著(P<0105),当坡向由南偏西10b到南偏西40b,林下幼树密度逐渐减少,至阴坡(北偏东10b)幼树数量又逐渐增加.不同坡位林分更新特征各异,平坡林分中幼苗、幼树密度均较大;从坡下向上,幼苗密度逐渐减少,而幼树密度逐渐增大;海拔从1159m增至1449m,幼树密度逐渐增加,至1658m时,幼树密度逐渐减小,而幼苗密度则一直呈现增加趋势.处于阴坡的中密度林分更新效果最佳.合理调整林分
3、密度是加快林分更新的有效途径之一.关键词秦岭山地油松次生林更新特征林分密度环境因子文章编号1001-9332(2011)07-1659-09中图分类号Q948文献标识码ARegenerationcharacteristicsandrelatedaffectingfactorsofPinustabulaeformissecondary1211forestsinQinlingMountains.KANGBing,WANGDe-xiang,CUIHong-an,DIWe-izhi,11DUYan-ling(CollegeofLifeScience,NorthwestA&FUniversity,Y
4、angling712100,Shaanxi,2China;CollegeofForestry,NorthwestA&FUniversity,Yangling712100,Shaanxi,China).-Chin.J.Appl.Ecol.,2011,22(7):1659-1667.Abstract:ThestudywithsamplingplotmethodshowedthatinPinustabulaeformissecondaryforestsinQinlingMountains,therewere36treespeciesinregenerationlayer,occupying511
5、4%ofthetota.lThedominantspecieswereQuercusglandulifera,Quercusalienavar.acuteserrata,andCory-lusheterophylla.Theseedlingbankwasabundan,tandwithlowerheightclassandageclass.Themainregenerationtypewasseedling,showingtheforestbeingatitsmiddlesuccessionperiod.Standdensityhadsignificanteffectsonsaplinga
6、ndseedlingdensities(P<0101).Thesaplingandseed--2lingdensitiesincreasedwhenthestanddensityincreasedfrom580trees#hmupto1500trees#-2hm,butdecreasedwiththefurtherincreaseofstanddensity.Slopeaspectalsohadsignificanteffectsontheseedlingandsaplingdensities(P<0105).Thesaplingdensitydecreasedgraduallywhent
7、heslopeaspectchangedfromSW10btoSW40b,butincreasedwiththeslopeaspectchangedtoshadyslope(NE10b).Theforestregenerationcharacteristicsdifferedatdifferentslopepositions,withthesaplingandseedlingdensitiesbeingrelativel
