祁连山4种杜鹃在不同海拔梯度上的株丛特征 |
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引用本文: | 李小龙,曹文侠,张晓燕,李文,韦应莉,王小军. 祁连山4种杜鹃在不同海拔梯度上的株丛特征[J]. 草原与草坪, 2017, 0(6): 57-64 |
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作者姓名: | 李小龙 曹文侠 张晓燕 李文 韦应莉 王小军 |
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作者单位: | 甘肃农业大学 草业学院/草业生态系统教育部重点实验室/甘肃省草业工程实验室/中-美草地畜牧业可持续发展研究中心,甘肃 兰州,730070 |
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摘 要: | 以分布于祁连山东段的头花杜鹃(Rhododendron.Capitatum)、千里香杜鹃(R.thymifolium)、烈香杜鹃(R.anthopogonoides)和陇蜀杜鹃(R.przewalskii)为对象,研究了其株丛特征与海拔梯度间的关系。随着海拔升高,头花杜鹃、千里香杜鹃和烈香杜鹃的冠基呈降低趋势。随着海拔升高,头花杜鹃与千里香杜鹃的重要值增加,并显著大于其他物种。在海拔3 100m处,杜鹃灌丛群落物种组成和多样性均处于较高水平。随着海拔升高,杜鹃灌丛总盖度逐渐降低。千里香杜鹃的分盖度在海拔3050m较小。头花杜鹃的分盖度在各海拔梯度上均较大。头花杜鹃和千里香杜鹃的植株高度随着海拔升高而逐渐降低。
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关 键 词: | 杜鹃灌丛 株丛特征 海拔梯度 |
The plant characteristic of four Rhododendron species at different altitude gradient in Qilian Mountain |
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Abstract: | Four Rhododendron shrubs (Rhododendron capitatum ,R.thymifolium,R.anthopogonoides ,and R.przewalskii)were chosen as indicators to study the relationship between plant characteristics and altitude gradients in the Qilian Mountain in the eastern Qinghai-Tibetan Plateau.The results revealed that the crown width of R.Capitatum,R.thymifolium and R.anthopogonoide decreased with altitude increasing.The spe-cious important value of Rhododendron.capitatum and R.thymifolium increased with the altitude increasing, and was significantly higher than that of other species.The species composition and diversity reached the high-est level at the 3100 m altitude.The total coverage of Rhododendron shrubs gradually decreased with altitude increasing.The sub-coverage of R.thymifolium reached the lowest level at the 3050 m altitude.The sub-cov-erage of R.capitatum was higher than that of other species.The height of R.capitatum and R.thymifolium gradually decreased with altitude increasing. |
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Keywords: | Rhododendron shrub pant characteristics altitude gradient |
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