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首页> 外文期刊>Mountain Research & Development >Habitat Fragmentation, Degradation, and Population Status of Endangered Michelia coriacea in Southeastern Yunnan, China
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Habitat Fragmentation, Degradation, and Population Status of Endangered Michelia coriacea in Southeastern Yunnan, China

机译：滇东南濒危含羞草的栖息地破碎，退化和种群状况

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摘要

Abstract The endangered tree Michelia coriacea Chang et B. L. Chen (Magnoliaceae) is endemic to southeastern Yunnan, China. It is found in limestone outcrop habitats in a few localities at 1300–1700?m. Its habitat has been severely fragmented and degraded by overexploitation, including logging, road construction, and agricultural development in recent decades, with only 4 populations remaining at present. The population dynamics of M. coriacea are practically unknown. We investigated all 4 populations and studied the demography and ecology to create a scientific base for recommendations on conservation and restoration of the species. The census was repeated in 5 consecutive years from 2006 to 2010. Over that period, the annual mortality rate was 68.9% during early recruitment (individuals under 70?cm high), but mortality decreased to 23.3% after seedling/sapling establishment. The population of M. coriacea is clearly declining. The major factor threatening its continued existence is poor regeneration caused by ecological conditions, including habitat destruction, invasive plants, and low recruitment. Unless conservation measures are undertaken, the species will not maintain its natural population. The information provided here will apply to conservation of not only M. coriacea but also other plants having similar population dynamics and growing in unprotected areas in fragile mountain ecosystems.
机译：摘要濒危树木Michelia coriacea Chang et B. L. Chen（木兰科）是云南东南部的特有树种。在1300-1700？m的几个地方的石灰岩露头生境中发现了它。近几十年来，由于过度采伐，包括伐木，道路建设和农业发展，其栖息地已被严重分割和退化，目前仅剩4个人口。实际上，M。coriacea的种群动态是未知的。我们调查了所有4个种群，并研究了人口统计学和生态学，从而为就该物种的保护和恢复提出建议提供了科学依据。从2006年到2010年，连续5年进行了人口普查。在此期间，早期募集期间的年死亡率为68.9％（低于70？cm的个体为高），但在建立苗/树苗后死亡率降至23.3％。 Coriacea的种群明显减少。威胁其继续存在的主要因素是由生态条件造成的再生不良，包括栖息地破坏，入侵植物和低招聘。除非采取保护措施，否则该物种将无法维持其自然种群。此处提供的信息不仅适用于Coriacea的分枝杆菌，而且适用于种群动态相似且在脆弱的山区生态系统未保护地区生长的其他植物。

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