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在神农架香溪河流域内不同海拔高度沿河岸带共设置42个与河岸方向相同的10 m宽、100 m长样带进行植被调查,发现河岸带分布有珍稀保护植物14种,占神农架地区珍稀植物总数的42.4%,这些珍稀植物主要分布在1200～1800 m山地常绿阔叶林、落叶阔叶混交林带,表明在神农架地区植物群落的物种多样性在中等海拔高度上最大。TWINSPAN分类可把14种珍稀物种可划分为低海拔、中等海拔和较高海拔种组3组,DCA排序也使14种珍稀物种在反映海拔梯度的第一轴可以得到很好的展示。本文还对河岸带珍稀植物分布格局的成因进行了探讨,明确指出应重视河岸带在珍稀物种保护方面的重要作用。图3表1参9。
A total of 42 sampling plots of 10 m wide and 100 m long in the same direction along the banks of the river were set up along the riparian zone at different altitudes within the Xiangxi River basin in Shennongjia. The vegetation was found in the riparian zone, with 14 rare and protected plants distributed, covering the rare plants in the Shennongjia area 42.4% of the total. These rare plants are mainly distributed in the evergreen broad-leaved forest and deciduous broad-leaved mixed forest in 1200 ~ 1800 m, indicating that the species diversity of plant community in Shennongjia is the highest at middle altitude. In the TWINSPAN classification, 14 rare species can be divided into three groups at low altitude, middle altitude and higher altitude. DCA ranking also enables the display of 14 rare species on the first axis reflecting the altitude gradient. This article also discusses the causes of the distribution pattern of the rare plants in the riparian zone, and clearly points out that the riparian zone should play an important role in the protection of rare species. Figure 3 Table 1 参 9.