天宝岩自然保护区不同海拔天然柳杉林物种多样性

以天宝岩国家级自然保护区天然柳杉林群落调查资料为基础,通过应用物种多样性测度方法进行计算分析,对不同海拔柳杉林群落的物种多样性特征进行了比较研究。结果表明:随着海拔的上升,柳杉林乔木层物种多样性总体上均呈现"中等海拔高度最低"但峰值偏向高海拔的特点;草本层物种多样性呈现"中间高度膨胀型"但峰值偏向高海拔的特点。群落物种多样性并未表现出明显的随海拔高度的变化规律,这表明了天宝岩自然保护区柳杉林群落物种多样性的一致性。1200~1600 m高海拔具有良好的水热条件,因此物种多样性最高;而1000~1200 m和900~1000 m中低海拔地区的人为破坏使得该海拔柳杉群落物种的多样性显著降低。

The Study on Species Diversity of Cryptomeria fortunei Community at Different Altitude Levels in Tianbaoyan Nature Reserve

Species diversity of natural Cryptomeria fortunei community at different altitude levels in Tianbaoyan national Nature Reserve was studied by means of field investigation,and was calculated and analyzed through the measure methods of species diversity.The results showed that the tree layer diversity of Cryptomeria fortunei community presented a hump-shaped pattern along the elevational gradient with a peak at high-elevations;What's more,the shrub layer diversity presented a mid-altitude bulge with a peak at high-elevations.The species diversity of Cryptomeria fortunei communities were not affected by altitude,which indicated the consistency of species diversity in Tianbaoyan national Nature Reserve.It was concluded that the abundant species at high-elevation(1200～1600 m) resulted from better thermal and humid conditions,while the conspicuous decline of species richness at mid-elevation(1000～1200 m) and low-elevation(900～1000 m) was a result of human disturbance.