神农架天然针阔混交林群落的种间联结性  

Interspecific association of natural mixed needle-and broad-leaved forest community in Shennongjia

作　　者：周秋静 赵常明[1] 舒化伟 葛结林[1] 赵本元 杨林森 姜治国 陈芳清 谢宗强[1,2] ZHOU Qiujing;ZHAO Changming;SHU Huawei;GE Jielin;ZHAO Benyuan;YANG Linsen;JIANG Zhiguo;CHEN Fangqing;XIE Zongqiang(State Key Laboratory of Vegetation and Environmental Change,Chinese Academy of Sciences,Institute of Botany,Beijing 100093,China;College of Biological and Pharmaceutical Science,China Three Gorges University,Yichang 443002,Hubei,China;Xingshan County State-Owned Longmen River Forest Farm,Xingshan 443700,Hubei,China;Hubei Shennongjia National Park Administration,Shennongjia 442421,Hubei,China;Shennongjia Rhinopithecus Key Laboratory of Conservation Biology in Hubei Province,Shennongjia 442421,Hubei,China)

机构地区：[1]中国科学院植物研究所植被与环境变化国家重点实验室,北京100093 [2]三峡大学生物与制药学院,湖北宜昌443002 [3]湖北省兴山县国有龙门河林场,湖北兴山443700 [4]湖北神农架国家公园管理局,湖北神农架442421 [5]神农架金丝猴保育生物学湖北省重点实验室,湖北神农架442421

出　　处：《广西植物》2020年第2期255-263,共9页Guihaia

基　　金：中国科学院前沿科学重点研究项目(QYZDY-SSW-SMC011);中国科学院战略性先导科技专项项目(XDA19050402)~~

摘　　要：该文在神农架国家公园内选取1 hm 2的森林动态监测样地,利用方差比率法(VR)、χ^2统计量检验、联结系数(AC),研究了该群落的乔木层、灌木层、草本层优势种的种间联结性。结果表明:(1)经χ^2统计量检验,乔木、灌木、草本层优势种种对中正负联结比依次为0.70、0.61、1.14,方差比率法(VR)测出各层次总体联结性均为显著正联结,说明针阔混交林群落正朝着稳定的方向演替。(2)联结系数(AC)结果显示乔木层有32.05%的负关联种对,针叶和阔叶优势树种间存在强烈的竞争关系,正联结关系仅存在阔叶树种间;灌木层和草本层分别有48.89%、34.17%的负关联种对,是由于具有相似生态学特性的物种对有限资源的竞争;乔木层、灌木层和草本层分别有65.38%、35.56%、44.17%的无关联种对,可能是物种占据合适生态位,物种间依赖性降低。以上结果表明神农架天然针阔混交林群落中少数种对的生境趋同性使种间表现为正联结,由于生态位重叠过多造成资源竞争使大多种对表现为负联结,同时较多优势种因占据合适的生态位使种对联结性弱。We selected 1 hm 2 dynamic monitoring plot of a natural mixed needle-and broad-leaved forest community in Shennongjia National Park,variance ratio(VR),χ^2 test,and association coefficient(AC)were used to determine the interspecific association of dominant species of tree,shrub and herb in the community.The results were as follows:(1)According to theχ^2 test,the positive-negative correlation ratios of the dominant species of tree,shrub and herb layers were 0.70,0.61 and 1.14,respectively.VR measured the overall association of each layer had a significantly positive correlation,the community was succeeding in a stable direction.(2)From AC,there were 32.05%negative association pairs in the tree layer,the coniferous and broad-leaved dominant species had a highly competition,and the positive correlation existed only between broad-leaved species.The shrub layer and the herb layer had 48.89%and 34.17%negative correlation pairs,respectively.It was due to the competition of limited resources by species with similar ecological cha-racteristics.There were 65.38%,35.56%,and 44.17%unrelated species pairs in the arbor,shrub,and herb layers,respectively.It may be that the species occupied a suitable niche and the dependence between species was reduced.It showed that a few pairs tended to the same habitat and species had a positive correlation.Due to the excessive overlap of niches,resource competition made a large number of pairs perform negatively.And more dominant species had weak connection due to occupying the appropriate niche.

关 键 词：生态位 种间竞争 稳定性 群落演替 经营管理 

分 类 号：Q948.15[生物学—植物学]