北京大学学报(自然科学版)

北京及周边地区植物叶的碳氮磷元素计量特征

韩文轩1,2,吴漪1,汤璐瑛1,陈雅涵1,3,李利平1,贺金生1,方精云1   

  1. 1. 北京大学城市与环境学院生态学系, 北京大学地表过程分析与模拟教育部重点实验室, 北京100871; 2.中国农业大学资源与环境学院环境科学与工程系, 北京100193; 3.北京大学深圳研究生院, 深圳518055;
  • 收稿日期:2008-07-19 出版日期:2009-09-20 发布日期:2009-09-20

Leaf Carbon, Nitrogen and Phosphorus Stoichiometry across Plant Species in Beijing and Its Periphery

HAN Wenxuan1,2, WU Yi1, TANG Luying1, CHEN Yahan1,3, LI Liping1, HE Jinsheng1, FANG Jingyun1   

  1. 1. Department of Ecology, and Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871; 2. College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193; 3.Shenzhen Graduate School of Peking University, Shenzhen 518055;
  • Received:2008-07-19 Online:2009-09-20 Published:2009-09-20

摘要: 通过测量北京及周边地区358种植物的叶碳、氮和磷(C,N,P)含量, 系统分析了该区域不同生长型植物的叶C,N,P的计量规律。结果显示, 本区植物叶C,N,P的几何均值分别是45.1%,2.61% 和0.20%(干重), 且叶片中C,N,P 含量分别是叶柄中相应元素含量的1.1,2.4 和1.8 倍, 反映了与器官功能相适应的元素计量分配关系。草本相比于木本植物具有高叶N(P) 低C 的特点, 而针叶树的叶N(C) 显著低于(高于)阔叶树, 但二者P含量没有显著差异。叶的C,N,P彼此显著相关, 其中C 和N(或P)负相关,N 和P正相关; 叶C∶N, C∶P 和N∶P 的几何均值是17.3, 242 和13.9。

关键词: 叶碳氮磷, 叶柄, 叶片, 元素计量, 北京, 植物生长型

Abstract: Based on a systematic field sampling and lab measurements of 358 native species, the regional stoichiometric patterns of leaf C, N and Pin Beijing and its periphery were investigated. The geometric means of leaf C, N and P are 45.1% ,2.61% and 0.20 % (dry weight), respectively. The content ratios of lamina C, N and Pto their petiole counterparts are 1.1, 2.4 and 1.8 for C, Nand P, respectively, as reflectsthe stoichiometric relationship between lamina and petiole. Herbs have higher leaf N and P and lower Cthan woody plants; conifers are significantly lower in leaf N( or higher in leaf C) , compared with broadleaves, but there is no significant difference in leaf P between the two growth-forms. Leaf C, N and P are correlated significantly between each other across all species or within growth-forms, with positive relationship between N and P, and negative between C and N ( P). The geometric mean mass ratios of leaf C∶N, C∶P and N∶P are 17.3, 242 and 13.9, respectively.

Key words: leaf carbon/nitrogen/phosphorus, petiole, lamina, stoichiometry, Beijing, growth-form

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