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5 3 4                                  广  西  植  物                                         43 卷
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            生态位空间ꎬ进而对光照等资源的竞争不激烈ꎬ能                             DIGGLE PJꎬ 1983. Statistical analysis of spatial point patterns
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            够彼此相对独立的分享生境资源ꎬ表现出种群处                              GAO FYꎬ ZHAO CZꎬ 2012. In the process of grassland
            于一种较稳定发展状态( 李明辉等ꎬ 2011ꎻLan et                        degradation the spatial pattern and spatial association of
                                                                 dominant species [ J]. Acta Ecol Sinꎬ 32 ( 21): 6661 -
            al.ꎬ 2012)ꎮ 幼苗与成树在 0 ~ 2 m 尺度上表现出
                                                                 6669. [高福元ꎬ 赵成章ꎬ 2012. 甘肃臭草型退化草地优势
            无显著关联性ꎬ在 2 ~ 15 m 尺度上表现出正相关ꎬ                         种群空间格局及其关联性 [ J]. 生态学报ꎬ 32(21):
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            这是由种子扩散限制或种间竞争引起的(Wiegand &
                                                               GUO YLꎬ WANG Bꎬ XIANG WSꎬ et al.ꎬ 2015. Spatial
            Moloneyꎬ 2004)ꎮ 幼苗与成树的关联性变化与青
                                                                 distribution of tree species in a tropical karst seasonal
            冈种子自身的生物学特性有关ꎬ青冈成树能够产                                rainforest in Nonggangꎬ Guangxiꎬ southern China [ J ].
            生大量种子ꎬ主要通过重力散播ꎬ而幼苗的分布范                               Biodivers Sciꎬ 23(2): 183-191. [郭屹立ꎬ 王斌ꎬ 向悟生ꎬ
                                                                 等ꎬ 2015. 广西弄岗北热带喀斯特季节性雨林监测样地种
            围在一定程度上体现了成熟种子的分布情况ꎮ                                 群空间点格局分析 [J]. 生物多样性ꎬ 23(2): 183-191.]
                                                               HARMS KEꎬ CONDIT Rꎬ FOSTER HRBꎬ 2001. Habitat
            4  结论                                                associations of trees and shrubs in a 50 ̄ha neotropical forest
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                                                               HE ZLꎬ XU Hꎬ QIN XSꎬ et al.ꎬ 2017. Spatial distribution
                 本研究结果表明径级结构呈倒“J” 型分布ꎬ说                          patterns and association of two Apocynaceae plants in the
                                                                 tropical mountain rainforests of Jianfenglingꎬ Hainan Islandꎬ
            明该种群处于稳定发展阶段且具有一定自我维持
                                                                 China [J]. Biodivers Sciꎬ 25(10): 1065-1074. [何增丽ꎬ
            和更新的能力ꎮ 幼苗、幼树和成树在较小尺度上表                              许涵ꎬ 秦新生ꎬ 等ꎬ 2017. 海南尖峰岭热带山地雨林 2 种
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            现为聚集分布ꎬ但幼树和成树在中、大尺度上基本
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            表现为随机分布ꎮ 这表明岩溶石山生境贫瘠ꎬ聚集                            HU Fꎬ ZENG FPꎬ DU Hꎬ et al.ꎬ 2018. Scale ̄dependent spatial
            分布有利于种群在竞争有限资源时发挥群体效应ꎬ                               patterns for species diversity in a karst evergreen and
                                                                 deciduous broad ̄leaved mixed forest of northwest Guangxi
            从而提高种群的存活率ꎮ 而幼苗与幼树和成树之
                                                                 [J]. Acta Ecol Sinꎬ 38(17): 6074-6083. [胡芳ꎬ 曾馥平ꎬ
            间主要呈空间正相关ꎬ说明幼苗对环境资源的需求                               杜虎ꎬ 等ꎬ 2018. 桂西北喀斯特常绿落叶阔叶混交林物种
            与幼树和成树具有相似性和互补性ꎬ但由于幼苗竞                               多样性分布格局的尺度效应 [J]. 生态学报ꎬ 38(17):
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            争能力弱ꎬ因此需要借助大树进行庇护才能生存ꎮ                             HU YHꎬ SHA LQꎬ BLANCHET FGꎬ et al.ꎬ 2012. Dominant
            本研究结果揭示了岩溶石山脆弱生态系统青冈种                                species and dispersal limitation regulate tree species
            群不同发育阶段的空间分布规律及其空间关联情                                distributions in a 20 ̄ha plot in Xishuangbannaꎬ southwest
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            况ꎬ为我国西南岩溶石山地区植被重建与恢复以及                             HU Gꎬ LIANG SCꎬ ZHANG ZHꎬ 2007. Quantitative analysis of
            生态系统服务功能的评价提供了科学依据ꎮ                                  Cyclobalanopsis glauca community on karst hills of Guilin
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