武夷山国家公园不同海拔甜槠群落结构变化分析
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福建省林业科技项目(2025FKJ14)


Analysis on changes of community structure of Castanopsis eyrei at different altitudes in Wuyishan National Park
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    摘要:

    通过分析群落结构变化情况,可为了解当前群落的演替状况并对未来应采取的群落调控措施提供理论依据。以武夷山国家公园甜槠(Castanopsis eyrei)林为研究对象,沿海拔梯度布设3块面积为0.48 hm2的动态监测样地,基于2018年和2023年群落调查数据,选择角尺度,混交度,大小比数作为林分空间结构参数,对群落进行空间结构分析并建立多元分布,并采用点格局分析中的g(r)函数对群落整体以及不同林层优势树种甜槠和马银花(Rhododendron ovatum)种群的空间分布格局进行分析。结果表明:(1)从一元分布结果来看,各样地中随机分布的个体比例均超过一半,表现出极强的混交度,不同优势等级的个体在群落中相对频率接近。(2)从多元分布结果来看,群落表现为极强度混交下的随机分布模式,整体处于中庸的生长状态。 (3)从空间分布格局结果来看,群落整体和马银花种群的空间分布格局都表现出在小尺度上集群分布,随尺度增大,群落整体的空间分布格局逐渐过渡为随机分布,马银花种群的空间分布格局转变为均匀分布;甜槠种群只在零星尺度上为集群分布,且几乎在全尺度上表现出随机分布格局。(4)经过5年生长更新,群落中生长绝对劣势个体的相对频率减少,混交强度下降,群落空间分布格局的集群分布尺度减小,随机分布尺度增大。综上,武夷山国家公园甜槠林结构稳定,符合较为理想的天然林群落结构,且已发展至演替后期。应继续加强保育,对森林开展长期监测,促进武夷山国家公园甜槠林群落的与生存更新。

    Abstract:

    Community spatial structure as the critical element of forest, plays an important role in judging the status of community and formulating forest regulation and management measures. This study aims to characterize the current stage of community succession and to provide a theoretical basis for precise future control measures. We selected the Castanopsis eyrei community in Wuyishan National Park as the research subject. Along a continuous elevational transect spanning 800 m to 1200 m above sea level, we established permanent forest dynamics monitoring plots at 200 m vertical intervals. Each plot covered a standardized area of 0.48 hm2, laying out three sample plots positioned at precisely defined benchmark elevations. Leveraging tree census data from 2018 and 2023, we selected three indices (uniform angle index, neighborhood comparison, mingling degree) as forest stand spatial structure parameters, analyzed the spatial structure of each sample plot and established multivariate distribution according to the results. Using the g(r) function of spatial point patterns to analyze the spatial distribution patterns of the entire community, the canopy-dominant C. eyrei and understory-dominant Rhododendron ovatum populations. The results demonstrated that: (1) The univariate distribution result revealed that over half of individuals exhibited random spatial distribution, indicating strong mingling within stands. Furthermore, individuals across different dominance classes maintained comparable relative frequencies within the community. (2) The multivariate distribution result revealed that the stand spatial structure showed a random distribution pattern under extreme intensity mixing, with maintaining a moderate growth status. (3) The results of spatial pattern analysis showed that the spatial distribution pattern of the entire community and R. ovatum populations showed cluster distribution on a small scale. With the increase of scale, the spatial distribution pattern of the entire community gradually changed to random distribution, and the spatial distribution pattern of R. ovatum populations changed to uniform distribution. C. eyrei populations exhibited clustered distribution only at isolated spatial scales, while demonstrating random distribution patterns across the entire scale spectrum, nearly. (4) Following five years of growth and regeneration, the relative frequency of competitively suppressed individuals decreased, accompanied by reduced mingling intensity. Furthermore, the spatial distribution pattern exhibited diminished clustering scales and expanded random distribution scales. In aggregate, these observations demonstrated that the community spatial structural of C. eyrei forests in Wuyishan National Park remains fundamentally stable, consistent with prototypical natural forest community structure, having progressed to a late seral stage of ecological succession, and will continue to optimize toward becoming a typical subtropical evergreen broad-leaved climax community. In future community management and regulation, conservation measures should be strengthened, external disturbances reduced, and long-term forest monitoring implemented to promote the survival and regeneration of the C. eyrei forest community and sustain its contributions to biodiversity conservation and ecosystem services.

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洪子辰,杨源广,刘禹豪,郑笑,陈世品,林文俊.武夷山国家公园不同海拔甜槠群落结构变化分析.生态学报,2026,46(6):2861~2876

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