Page 7 - 《广西植物》2020年第8期
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            ( 1. College of Life Sciencesꎬ Zhejiang Universityꎬ Hangzhou 310058ꎬ Chinaꎻ 2. State Key Laboratory of Vegetation and
                   Environmental Changeꎬ Institute of Botanyꎬ Chinese Academy of Sciencesꎬ Beijing 100093ꎬ Chinaꎻ
                      3. Administration of Qianjiangyuan National Parkꎬ Kaihua 324300ꎬ Zhejiangꎬ China )
       Abstract: Gutianshan National Nature Reserve (GNNR) preserves a large expanse of low elevation typical EBLFs. In
       order to understand how species composition of evergreen broad ̄leaved forests (EBLFs) vary at the regional scale and
       the underlying driversꎬ we investigated species composition of 29 20 m × 20 m plots in GNNRꎬ and collected data of
       other 14 typical EBLFs that distributed across subtropical eastern Chinaꎬ then we investigated the species composition
       difference between 15 typical EBLFsꎬ as well as how geographical and physical environments drove these
       differences. The results were as follows: (1) GNNR EBLFs composed a variety of community typesꎬ such as Castanopsis
       forest and Cyclobalanopsis forest etc. Species composition of GNNR EBLFs was representative in subtropical eastern
       China. (2) Species composition (β diversity) largely differed between EBLFs. Physical environmentsꎬ instead of geo ̄
       graphical distanceꎬ was the most influential factor of EBLF species composition. EBLF species composition was the most
       influenced by the minimum temperature of the coldest month (MTCM). (3) Composition of leaf life forms of 15 typical
       evergreen broad ̄leaved forests was the most strongly influenced by the minimum temperature of the coldest month
       (MTCM)ꎬ then by the maximum temperature of the coldest month (MTWM). These results indicate that habitat filtering
       is the main driver of the difference of woody plants species composition among eastern typical EBLFsꎬ and suggest cold
       temperature is the most important determinant of eastern typical EBLFs communitiesꎬ would provide guidance for conser ̄
       vation and restoration of EBLFs.
       Key words: mid ̄subtropicsꎬ eastern typical evergreen broad ̄leaved forestsꎬ β diversityꎬ leaf life formꎬ habitat filtering

       亚热带常绿阔叶林是世界上主要的森林植被                           温带落叶阔叶林之间物种组成差异主要受环境过
   类型之一ꎬ主要分布在中国( 吴征镒ꎬ1980ꎻJin et                     滤的影响(Liu et al.ꎬ 2015)ꎬ在区域尺度上秦岭西
   al.ꎬ 2018)ꎬ以中亚热带低海拔地区分布的常绿阔                       部的物种组成受扩散限制的影响更大( 赵鸣飞等ꎬ
   叶林最为典型ꎬ为该地区的地带性植被类型ꎮ 我                            2017)ꎮ
   国常绿阔叶林的分布范围广ꎬ研究者们已在不同                                 我国常绿阔叶林以常绿 乔 木 和 常 绿 灌 木 为

   地区、不同尺度开展了一些相关研究ꎬ如 Wang et                        主ꎬ同时包含有落叶成分( 宋永昌等ꎬ2015)ꎮ 常绿
   al.(2011)研究了我国木本植物分布格局ꎬ宋永昌                        物种与落叶物种有着不同的生存策略ꎬ植物的落
   等(2015)比较了我国常绿阔叶林分布区 8 个大型                        叶现象是植物对季节性干旱、低温气候等不利条
   森林 动 态 监 测 样 地 的 群 落 特 征 差 异ꎬ 王 希 华               件的适应性变化(Wolfeꎬ 1987)ꎮ 常绿植物和落叶
   (2006)研究了我国典型常绿阔叶林物种多样性分                          植物对气候变化有不同的响应机制ꎬ二者的相对
   布格局ꎮ 在较小尺度ꎬ各地区的研究者对当地有                            优势度体现群落外貌ꎬ是植物群落的重要特征ꎬ也

   代表性的常绿阔叶林开展了研究ꎮ                                   是植被类型的分类依据(白坤栋等ꎬ2010ꎻZhang et
       生态位理论认为群落物种组成主要受环境因                           al.ꎬ 2010ꎻ宋永昌ꎬ2016ꎻ陶旺兰等ꎬ2018)ꎮ 常绿
   素和生物间相互作用的影响ꎬ中性过程强调扩散                             阔叶林通常指热带以外由常绿阔叶树种占优势的

   限制对群落物种组成有决定性作用ꎬ有研究证明                             湿润森林ꎬ因气候带和地貌等差异ꎬ根据优势或指
   生态位过程和中性过程共同影响群落的生物多样                             示层片划分为不同植被亚型ꎬ其中典型常绿阔叶
   性ꎬ二者对群落构建的相对重要性随研究地点和                             林分布于中亚热带温暖湿润地区ꎬ外貌终年常绿ꎬ
   尺度而异(Soininen et al.ꎬ 2007ꎻ牛克昌等ꎬ2009)ꎮ            树冠整齐(宋永昌ꎬ2013)ꎮ
   一般认为ꎬ空间尺度越大生态位过程对物种的影                                 东部典型常绿阔叶林是典型常绿阔叶林在我
   响越 大ꎬ 空 间 尺 度 越 小 中 性 过 程 的 影 响 越 大               国东部中亚热带地区广泛分布的植被亚型( 宋永
   ( Garzon ̄lopez et al.ꎬ 2014ꎻChaseꎬ 2014)ꎬ如我国      昌ꎬ2013)ꎮ 目前ꎬ关于东部典型常绿阔叶林的研
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