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长白山林线植物岳桦和牛皮杜鹃养分化学计量特征及其影响因子

刘佳庆1,2,孟莹莹1,2,包也1,2,贾娟1,2,周莉1,周旺明1,于大炮1**,代力民1   

  1. (1中国科学院沈阳应用生态研究所森林与土壤生态国家重点实验室, 沈阳 110016; 2中国科学院大学, 北京 100049)
  • 出版日期:2013-12-10 发布日期:2013-12-10

Nutrient stoichiometry of Betula ermanii and Rhododendron aureum and related affecting factors on timberline of Changbai Mountains, Northeast China.

LIU Jia-qing1,2, MENG Ying-ying1,2, BAO Ye1,2, JIA Juan1,2, ZHOU Li1, ZHOU Wang-ming1, YU Da-pao1**, DAI Li-min1   

  1. (1State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2013-12-10 Published:2013-12-10

摘要:

为了探究长白山高山岳桦林线形成过程中的养分机理,本研究通过测定林线上分布的主要植物——岳桦和牛皮杜鹃的叶片与1年生枝条中的全碳、全氮和全磷含量及其与土壤养分的相关关系,并分析了其养分含量沿海拔的变化规律,以及叶片、枝条与土壤养分含量之间的相关关系。结果表明:长白山自然保护区海拔1850~2050 m(树木线),岳桦、牛皮杜鹃叶片及1年生枝条的C、N、P含量沿海拔的变化趋势相同,且N/P明显小于14,说明其生长受到了N限制;同时,与低海拔植物叶片和1年生枝条中P含量相比,在林线以上的高海拔植物叶片和1年生枝条中P的含量低,说明岳桦和牛皮杜鹃在林线上可能存在P限制。2种植物N、P的含量随海拔的升高没有明显的降低趋势,表明在岳桦树木线(海拔2050 m)以下,养分限制与低温无关,而2种植物在林线上的斑块状分布与可能土壤养分供应有关。
 

Abstract: Nutrient limit at high altitude is one of the main formation mechanisms of global timberline. In order to explore the factors limiting the forest distribution at high altitudes in Changbai Mountains of Northeast China, this paper determined the total carbon (TC), total nitrogen (TN), and total phosphorous (P) contents in the leaves and one-year old branches of the tree species Betula ermanii and its associated bush species Rhododendron aureum in the Mountains, and analyzed the relationships of these nutrients contents with soil nutrients and altitudinal gradient. At altitude 1850-2050 m (timberline), the TC, TN, and TP contents in the two species leaves and one-year old branches had the same variation trend along the altitudinal gradient, and the N/P in all the organs was far less than 14, indicating that the growth of the two species was suffered from N limitation. In the meantime, as compared with that at low altitudes (below 1950 m), the TP content in all the organs of the two species at high altitudes was lower, suggesting that the two species on timberline were suffered from P limitation. The TN and TP contents of the two species had no obvious decreasing trend along the altitudinal gradient, suggesting that below the timberline (2050 m), the N and P limitations had no relationship with low temperature, while the patchy distribution of the two species above the timberline could be related to the soil nutrient supply.