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时间:2020-04-25
《吉林蛟河次生针阔混交林群落结构与微地形关系-论文.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、第42卷第5期东北林业大学学报Vo1.42No.52014年5月J0URNAL0FN0RTHEASTF0REsTRYUNIVERSITYMay2014吉林蛟河次生针阔混交林群落结构与微地形关系)何怀江张春雨赵秀海倪瑞强高海涛王贵春(森林资源与生态系统过程北京市重点实验室(北京林业大学),北京,100083)(吉林省林业实验区管理局)摘要以吉林蛟河次生针阔混交林监测样地调查数据为基础.分析了近熟林群落的空间结构及树种多样性与微地形之间的关系。结果表明:地形变量和空间变量[a+h+c]共同解释了群落树种组成空间变异的67%,其中:地形变量[a+b]对群落树
2、种组成空间变异的解释量高达41%。地形变量『a+b]对树木大小分化、林分胸高断面积空间变异影响显著,解释量分别为15.47%和41.5%。地形变量『a+b1对树种丰富度和Shannon多样性空间变异解释量分别为15.33%和22.29%,对树种多度的空间变异解释量仅为5.03%,对树木聚集性的空间变异解释量极低。树木大小分化与海拔、坡度、凸凹度和山脊环境正相关,与山腰环境负相关。群落结构与地形因子典范对应分析显示林分群落结构主要由坡度决定,同时表现出显著的海拔梯度变化。地形位置(山谷、山脊)差异也强烈地影响着群落结构。关键词典范对应分析;地形变量;空间
3、变量;方差分解分类号$718.5AssociationsbetweenCommunityStructureandMicrotopographyinMixedBroadleaf-coniferForestofJiaohe,Ji-linProvince/HeHuaijiang,ZhangChunyu.ZhaoXiuhai.NiRuiqiang(KeyLaboratoryforForestResources&EcosystemProcessesofBeijing,BeijingForestryUniversity,Beijing100083,P.R.Chin
4、a);GaoHaitao,WangGuichun(ForestEx—perimentalAreaAdministrationofJilinProvince)//JournalofNortheastForestryUniversity.一2014,42(5).一l3~l7.33Westudiedtheassociationsbetweenspatialcommunitystructurespeciesdiversityandmicrotopographywiththedataofa320rex660mplotintemperatemixedbroadle
5、af-coniferforestinJiaoheofJilinprovince.Topographicvariablesandspacevariablecanbeusedtoexplain67%ofspeciesspatialvarianceintreecommunitytogether.Topographicvariablescanbeusedtoexplain41%ofspatialvariabilityintreecommunityalone.Topographicvariablesaffectsignificantlytreessizediff
6、erentiationandstandbasalarea.whichexplains15.47%ofspatialvariationintreessizedifferentiationand41.5%ofspatialvariationinstandbasalarea.respectively.Theexplanationcapacityoftopographicvariablesis15.33%fortreespeciesrichnessand22.29%forShannondiversity.Buttopographicvariablesshowl
7、owerexplanationcapacityfortreespeciesabundanceandaggregation.Treesizedifferentiationpositivelyrelatestoelevation,slope,convexityandridge,butnegativelyrelatestohillside.CCAanalysisbetweencommunitystructureandtopographicvariablesshowsthatcommunityisdeterminedbyslope,andexhibitsasi
8、gnificantchangeofelevationgradient.Meanwhile,to
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