Distribution Pattern and Conservation Priorities for Vascular Plants in Southern China: Guangxi Province as a Case Study

中國西南和越南北部是具有世界意義的生物多樣性關鍵地區，但該區豐富生物同時也面臨著嚴重的威脅。本文選擇其中的典型代表廣西省，利用標本記錄來確定生物多樣性熱點，並與現有保護區網路比對以評價其保護狀態。通過構建10'×10'的網格系統把全省分成801個經緯度跨度相等的網格，使用了包括PE、IBK、GXIU等13家主要標本館170,000多條館藏標本資料，涵蓋了6,506種分佈于該區的野生維管植物（其中548種屬該省區特有）進行統計分析。研究共確認了8個生物多樣性熱點地區，其中一個基於物種豐富度分佈格局，一個基於特有種分佈格局，其餘六個則同時綜合了二者的分佈格局。8個生物多樣性熱點中，有三個分佈于石灰岩區，5個分佈于酸性土區。絕大多數確認的生物多樣性熱點都已被現有保護區網路有效覆蓋，但仍有一些特有種特別豐富的區域沒有得到保護，顯示現有保護區網路存在的不足。本研究可爲類似尺度區域生物多樣性熱點的確認、優先保護順序的評定，以及現有保護區網路的設置策略等方面提供參考。

關鍵字

生物多樣性熱點；優先保護；分佈格局；特有種；物種豐富度；中南南部

並列摘要

The area encompassing Southern China and North Vietnam is highlighted by very high levels of biodiversity but also exceptional threats. Guangxi Province was selected as one of the most representative regions within this area to detect biodiversity hotspots for conservation and to evaluate protection effectiveness of present reserve network using herbarium records. Collection data from 6,506 vascular plant species occurring in the province (548 of these are endemic to the province) were used to explore patterns of biodiversity at 10-minute grid resolution, with the main goal of identifying the occurrence of centers of species richness and endemism. Up to eight distinct hotspots, mainly in mountain areas, were recognized, six based on the combination of species richness and endemism, one on richness only and one on endemics only. Of these, three are specific to limestone areas while the remaining five are located in acid soil regions. Most of centers of species richness and endemism are protected by the current reserve network, although several gaps can be recognized. This research can provide an overview of approaches to setting biodiversity conservation priorities and of strategies for filling up gaps in the reserve network of similar regions.

並列關鍵字

Biodiversity hotspot ； Conservation priority ； Distribution pattern ； Endemism ； Species richness ； Southern China

國際替代計量

Distribution Pattern and Conservation Priorities for Vascular Plants in Southern China: Guangxi Province as a Case Study

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