• 研究报告 •

### 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

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

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.