Soil nutrient availability determines the facilitative effects of cushion plants on other plant species at high elevations in the south-eastern Himalayas
Soil nutrient availability determines the facilitative effects of cushion plants on other plant species at high elevations in the south-eastern Himalayas
复制标题
土壤养分有效性决定了喜马拉雅山脉东南部高海拔地区垫状植物对其他植物物种的促进作用
DOI：
10.1080/17550874.2013.872206
复制
发表时间：
2015-03-04
影响因子：
1.5
通讯作者：
Sun, Hang
中科院分区：
文献类型：
--
作者：
Chen, Jianguo;Yang, Yang;Sun, Hang
背景：坐垫是高海拔环境中的典型护理物种。然而，很少有研究探讨具有共同垫状形态的不同物种的护理植物在促进能力和环境改善方面的差异。目的：比较不同高山垫状植物的护理效果及其作用机制。方法：比较两种共生垫状植物--节柄委陵菜和多毛委陵菜对喜马拉雅地区植物物种丰富度、Shannon-Wiener多样性和维管植物群落均匀度的影响。此外，我们还比较了两种垫层树种内外的温度和土壤养分。结果：与垫层外区域相比，垫状物种的存在显著增加了物种的丰富度和多样性，节柄毛藻的物种丰富度高于多毛类。两种树种下和开阔地的底物温度相似，但两种垫状树种下的氮和钾水平都高于室外。节节松林下土壤磷、钾含量显著高于多毛藻垫层下土壤磷、钾含量。结论：我们的结果表明，垫状植物对当地物种丰富的促进作用有助于东喜马拉雅高山植物群落的结构。不同施主树种下土壤养分水平不同，抚育效应的强度也不同。
Background: Cushions are the typical nurse species of high-elevation environments. However, few studies have explored the differences in facilitative power and environmental amelioration between nurse plants of different species that share a common cushion morphology. Aims: To compare the nurse effects of different alpine cushion plants and their mechanism. Methods: We compared the effects of two co-occurring cushion species, Potentilla articulata and Arenaria polytrichoides on species richness, Shannon–Wiener diversity and the evenness of vascular plant assemblages in the Himalayas. In addition, we compared the temperature and the soil nutrients within and outside the two cushion species. Results: The presence of either cushion species significantly increased the species richness and diversity in comparison with the areas outside the cushions; P. articulata cushions were associated with greater species richness than A. polytrichoides. Substrate temperatures were similar under the two species and in open areas, but nitrogen and potassium levels were higher under either of the two cushion species than they were outside. Soil phosphorus and potassium concentrations were significantly higher beneath P. articulata than beneath the A. polytrichoides cushions. Conclusions: Our results indicate that facilitation of local species richness by cushion plants contributes to the structure of the alpine plant community in the eastern Himalayas. The intensity of the nurse effect varies with the soil nutrient level beneath different benefactor species.