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1、應(yīng)用生態(tài)學(xué)報(bào)2011年7月第22卷第7期ChineseJournalofAppliedEcology,Ju.l2011,22(7):1659-1667*秦嶺山地油松群落更新特征及影響因子12**111康冰王得祥崔宏安迪瑋峙杜焰玲12(西北農(nóng)林科技大學(xué)生命科學(xué)學(xué)院,陜西楊凌712100;西北農(nóng)林科技大學(xué)林學(xué)院,陜西楊凌712100)摘要采用樣方法,對秦嶺山地油松次生林群落更新特性和相關(guān)環(huán)境因子進(jìn)行了研究.結(jié)果表明:油松次生林更新層喬木樹種共36種,占總種數(shù)的5114%;優(yōu)勢種有短柄枹櫟、銳齒櫟和榛子等;幼苗庫豐富,高度級及齡級較小;更新方式以實(shí)生為主,該森林群落處于演替中-2期、林分密度對林
2、下喬木幼苗、幼樹數(shù)量影響極顯著(P<0101),當(dāng)林分密度從580株#hm-2增加到1500株#hm時(shí),林下更新的幼苗、幼樹密度呈增加趨勢,隨著林分密度的繼續(xù)增加,其密度逐漸減少;坡向?qū)τ酌纭⒂讟涿芏鹊挠绊戯@著(P<0105),當(dāng)坡向由南偏西10b到南偏西40b,林下幼樹密度逐漸減少,至陰坡(北偏東10b)幼樹數(shù)量又逐漸增加.不同坡位林分更新特征各異,平坡林分中幼苗、幼樹密度均較大;從坡下向上,幼苗密度逐漸減少,而幼樹密度逐漸增大;海拔從1159m增至1449m,幼樹密度逐漸增加,至1658m時(shí),幼樹密度逐漸減小,而幼苗密度則一直呈現(xiàn)增加趨勢.處于陰坡的中密度林分更新效果最佳.合理調(diào)整林分
3、密度是加快林分更新的有效途徑之一.關(guān)鍵詞秦嶺山地油松次生林更新特征林分密度環(huán)境因子文章編號1001-9332(2011)07-1659-09中圖分類號Q948文獻(xiàn)標(biāo)識碼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
