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首页> 外文期刊>Global Ecology and Conservation >Variation patterns of plant composition/diversity in Dacrydium pectinatum communities and their driving factors in a biodiversity hotspot on Hainan Island, China
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Variation patterns of plant composition/diversity in Dacrydium pectinatum communities and their driving factors in a biodiversity hotspot on Hainan Island, China

机译：中国海南岛植物果实植物社区植物成分/多样性的变异模式及其在中国海南岛生物多样性热点的驱动因素

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Climate changes and human-mediated modifications to ecosystems have threatened the biodiversity and habitats of various species. Dacrydium pectinatum is a constructive and endangered species in the tropical mountain forests of Hainan Island, China. In this study, we established sixty-eight 30?m?×?30?m permanent plots of D. pectinatum along an environmental axis of temperature and precipitation in the west (Bawangling, 30 plots), southwest (Jianfengling, 30 plots) and east (Diaoluoshan, 8 plots) of Hainan Island. Our objectives are to explore the change mechanisms of plant composition/diversity in the D. pectinatum community at distinct environmental scales and analyze the association between environmental factors (topography, soil and stand conditions) and vegetation distribution. The results showed that the diversity of D. pectinatum communities was lower than that in tropical forests at other sites around the world and much higher than that in subtropical forests at similar latitudes. At the regional scale, plant diversity showed a pattern that decreases with increasing latitude; at the local scale, diversity decreases with increasing elevation. Eight environmental factors, namely, elevation, slope, canopy density, soil organic matter, soil pH, soil total nitrogen, soil available phosphorus and soil available potassium, showed a significant correlation to species distribution. Elevation factors were identified as the determinants of the overall diversity patterns. In conclusion, our study clarified that abiotic environmental factors strongly influence the vegetation structure and diversity pattern of the D. pectinatum communities in various environmental scales. Low temperatures, high humidity, low soil nutrients, and high stand density may be the limiting factors that cause their diversity to decline. We recommend various actions to ameliorate the impact of environmental changes on the D. pectinatum community, such as protecting existing habitats, strengthening monitoring of restrictive environmental factors, appropriate thinning of higher density stands, and conducting research on genetic diversity to improve the community survivability.
机译：气候变化和对生态系统的人性化的修改威胁到各种物种的生物多样性和栖息地。 Dacrydium pectinatum是中国海南岛的热带山区的建设性和濒危物种。在这项研究中，我们建立了六十八30？m？×30？m永久性地块，沿西部（Bawangling，30个地块），西南（Jianfengling，30个地块）和的环境轴线沿着环境轴的D. pectinatum的D. pectinatum的永久性图。海南岛东（Diaoluoshan，8个地块）。我们的目标是探讨D. pectinatum社区的植物成分/多样性的变化机制，在不同的环境规模，分析环境因素（地形，土壤和站点条件）和植被分布之间的关联。结果表明，D. pectinatum社区的多样性低于世界各地的热带森林，远远高于类似纬度的亚热带林。在区域规模，植物多样性展示了随着纬度的增加而减少的模式;在当地规模，随着高度的增加，多样性降低。八个环境因素，即升高，坡，冠层密度，土壤有机质，土壤pH，土壤总氮，土壤可用磷和土壤可用钾，表现出与物种分布的显着相关性。鉴定了升高因子作为整体多样性模式的决定因素。总之，我们的研究澄清了非生物环境因素强烈影响各种环境规模的D.果胶社区的植被结构和多样性模式。低温，高湿度，低土壤营养，高度密度可能是导致流动性衰退的限制因素。我们建议各种行动改善环境变化对D. pectinatum社区的影响，例如保护现有的栖息地，加强监测限制性环境因素，适当减薄更高的密度展望，以及对遗传多样性进行研究以提高群落生存性。

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