Plant growth and reproduction on a toxic Alpine ultramafic soil: adaptation to nutrient limitation
Plant growth and reproduction on a toxic Alpine ultramafic soil: adaptation to nutrient limitation
复制标题
DOI：
10.1046/j.1469-8137.1997.00799.x
复制
发表时间：
1997-10-01
期刊：
影响因子：
9.4
通讯作者：
Proctor, J
中科院分区：
文献类型：
--
作者：
Nagy, L;Proctor, J
苏格兰米克尔基兰诺克的超镁铁岩遗址有小块稀疏的殖民地，土壤中含有剧毒（对许多非土著植物）的镁和镍。这些有毒金属不太可能是开放植被的主要原因，因为本土植物至少部分耐受它们。假设低土壤养分是一个可能的原因，开放的植被进行了测试的施肥实验中，主要的养分和钙添加在1991年8月和1992年7月的复制样方，最初有5.3- 6.6%的植物覆盖。有一个大的增加，植物覆盖的主要养分添加。在莲座大小，开花，种子生产，和占主导地位的semelparous的Cocumaria pyrenaica DC招聘的增加。SSP. alpina（Bab.）达尔比被详细研究过。营养物质的增加增加的生长的Cocalaria（和其他一些本地物种在网站上），加强了一个主要的营养缺乏，而不是金属毒性限制植物生长在米克尔Kilrannoch的论点，并表明，至少有一些压力耐受响应快速增长和繁殖时，营养限制被删除。1993年6月进行的一项小规模试验表明，主要养分分别添加，P而不是N或K是限制性元素。P的影响似乎与毒性离子Mg 2+和Ni 2+的可用性的任何可能的减少无关。
The ultramafic sites at Meikle Kilrannoch, Scotland, have small sparsely colonized patches with soils which have highly toxic (to many non-indigenous plants) concentrations of Mg and Ni. These toxic metals are unlikely to be the main cause of the open vegetation as the indigenous plants are at least partially tolerant of them. The hypothesis that low soil nutrients were a likely cause of the open vegetation was tested by a fertilization experiment in which major nutrients and Ca were added in August 1991 and July 1992 to replicated quadrats which initially had 5.3-6.6 % plant cover. There was a large increase in plant cover on major nutrient addition. The increase in rosette size, flowering, seed production, and recruitment of the dominant semelparous Cochlearia pyrenaica DC. ssp. alpina (Bab.) Dalby was studied in detail. The increased growth of Cochlearia (and some other native species at the site) on nutrient addition strengthens the argument that a major nutrient deficiency rather than a metal toxicity limits plant growth at Meikle Kilrannoch and shows that at least some stress tolerators respond with rapid growth and reproduction when nutrient limitation is removed. A small-scale experiment set up in June 1993, in which the major nutrients were added separately, suggested that P and not N, or K was the limiting element. The effects of P seem to be unrelated to any possible reduction in the availability of the toxic ions Mg2+ and Ni2+.