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《不同发育阶段兴安落叶松林下植被多样性特征.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、沈阳农业大学学报,2013—12,44(6):771—775JournalofShenyangAgriculturalUniversity,2013—12,44(61:771—775不同发育阶段兴安落叶松林下植被多样性特征王飞,张秋良,马秀枝,郭旭(1.内蒙-k农业大学林学院,呼和浩特010019;2.内蒙古金岗重工有限公司,呼和浩特010076)摘要:采用空间替代时间的方法,对大兴安岭不同发育阶段兴安落叶松3种林型林下植被物种多样性进行研究。结果表明:林下植被物种多样性随兴安落叶松林的发育年龄而改变。草类一兴安落叶松林灌草层多样性从幼龄林开始,
2、增加到中龄林(或近熟林)达到最大值(中龄林灌木层D、H为0.34和0.55,草本层H为1.07;近熟林草本层D为0.54),然后随郁闭度的增加在成熟林(灌草层D、H分别为0.20,0.38和0.32,0.63)降到最低,到过熟林由于林冠疏开和自然整枝增强了林地光照强度,多样性又升高。杜香一兴安落叶松林灌草层多样性从幼龄林开始,增加到近熟林达到最高(灌草层D和H分别为0.39,O.76和0.57,1.06),灌木层在过熟林最低(D和H为0.37和0.64),草本层在成熟林最低(D和H为0.42,0.77)。藓类一兴安落叶松林灌木层多样性近熟林最低(
3、D、H为O.41和0.76),H在中龄林最高(0.80),D在过熟林为最高(0.48);草本层中龄林多样性最低(D、H为O.50和0.83),过熟林最高(D、H为O.68和1.32)。林下植被物种多样性的变化与林分密度呈负相关,与植被和灌木总盖度呈正相关。关键词:兴安落叶松;林型;林龄;林下植被;物种多样性DOl:1O.3969/j.issn.1000—1700.2013.06.010中图分类号:$75文献标识码:A文章编号:1000—17O0(2013)06—00771—05UnderstoryVegetationDiversityatDife
4、rentAgeofLar/xgmeliniiForestsWANGFei,ZHANGQiu—liang,MAXiu-zhi,GUOXu(1.CollegeofForest,InnerMongoliaAculturalUniversity,Huhhot010019,China;2.InnerMongoliaJingangHeavyIndustryCo.LTD,Huhhot010076,China)Abstract:Inordertocomparethediversitydynamicsofunderstoryvegetationindifferen
5、tdevelopmentalstages,threeforesttype,SPhagnum—Bryum—Larixgmeliniiforest,herbage-Lar/xgmeliniiforestandLedumpalustre-LarixgmeliniiforestwereselectedinDaxinganlingregionusingtheme~odoftemporalandspatialsubstitution.TheSimpsonindex(D),Shannon—Wienerindex(H)andPielouevennessindex
6、(J)wereallused.Theresultssuggestedthatthediversityofshrubbyandherbaceousinherbage-Lar/xgmeliniiforesthadthesamedynamics,increasedfromtheearlystageoftheforest,thendecreasedwiththeincreaseofforestcrowndensity,andincreasedagainwithdecreaseofforestcrowndensityintheovermaturefores
7、t.Theunderstoryvegetationdiversitypeakedinthenearlymatureforest,andreachedthelowestintheovermatureforestfordiversityofshrubbyandinthematureforestfordiversityofherbaceousinLedumpdustre-Larixgmeliniiforest.ThediversityofshrubbyandherbaceousinSPhagnum—Bryum-Larixgmeliniiforestal
8、lpeakedintheovermatureperiod(thevalueofDandHwas0.68and1.32,respectiv
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