植物生态学报 ›› 2012, Vol. 36 ›› Issue (3): 222-230.DOI: 10.3724/SP.J.1258.2012.00222

所属专题: 生态化学计量

• 研究论文 • 上一篇    下一篇

松嫩草地80种草本植物叶片氮磷化学计量特征

宋彦涛1, 周道玮2,*(), 李强2, 王平3, 黄迎新2   

  1. 1东北师范大学草地科学研究所, 植被生态科学教育部重点实验室, 长春 130024
    2中国科学院东北地理与农业生态研究所, 长春 130012
    3东北师范大学城市与环境科学学院; 国家环境保护湿地生态与植被恢复重点实验室, 长春 130024
  • 收稿日期:2011-07-11 接受日期:2011-12-16 出版日期:2012-07-11 发布日期:2012-02-28
  • 通讯作者: 周道玮
  • 作者简介:* E-mail: zhoudaowei@neigae.ac.cn

Leaf nitrogen and phosphorus stoichiometry in 80 herbaceous plant species of Songnen grassland in Northeast China

SONG Yan-Tao1, ZHOU Dao-Wei2,*(), LI Qiang2, WANG Ping3, HUANG Ying-Xin2   

  1. 1Key Laboratory of Vegetation Ecology, Ministry of Education, Institute of Grassland Science, Northeast Normal University, Changchun 130024, China
    2Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China
    3School of Urban and Environmental Sciences, Northeast Normal University; State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, Changchun 130024, China
  • Received:2011-07-11 Accepted:2011-12-16 Online:2012-07-11 Published:2012-02-28
  • Contact: ZHOU Dao-Wei

摘要:

以松嫩草地常见草本植物为研究对象, 分析了各生活型和功能群叶片氮磷化学计量特征。结果显示: 松嫩草地80种草本植物的叶片氮、磷质量浓度分别为(24.2 ± 0.96) mg·g -1和(2.0 ± 0.10) mg·g -1, 面积浓度分别为(13.0 ± 0.54) mg·cm -2和(1.0 ± 0.05) mg·cm -2, 氮磷比为13.0 ± 0.39, 氮磷比与叶片磷质量浓度、叶片氮、磷面积浓度有显著相关关系; 松嫩草地植物生长受到氮限制。一年生植物叶片氮、磷质量浓度和变异系数高于其他生活型, 各生活型之间氮面积浓度和氮磷比差异不显著。豆科植物叶片氮的质量浓度、面积浓度和氮磷比高于其他功能群。在不同生活型或功能群之间, 植物叶片磷的面积浓度差异不显著, 都在1.0 mg·cm -2左右; 适当地增加群落中豆科植物的比例, 可能有助于提高松嫩草地产量和质量。

关键词: 生态化学计量学, 叶片氮磷含量, 氮磷比, 植物功能群, 松嫩草地

Abstract:

Aims Leaf nitrogen (N) and phosphorus (P) and N : P stoichiometry have been studied intensively in different regions in China. Songnen grassland is a natural region. Its dominant vegetation is meadow, which is determined by soil properties, and its flora is complex. Our objective was to find the stoichiometric patterns for this region.
Methods Leaf samples of 80 herbaceous species were collected in Songnen grassland in August 2008. We determined leaf N, P, and N : P on both a mass and an area basis and tested the differences according to plant life forms and functional groups.
Important findings Leaf N and P concentrations were (24.2 ± 0.96) and (2.0 ± 0.10) mg·g-1 on a mass basis and (13.0 ± 0.54) and (1.0 ± 0.05) mg·cm -2 on an area basis, respectively. N : P was (13.0 ± 0.39). Plant growth was limited by N in Songnen grassland. The concentration of leaf N and P and coefficient of variation were higher in annual plants than in other life forms on a mass basis, and there were no significant differences of leaf N concentration on an area basis and N : P between different life forms. Leaf N concentrations both on mass and area bases and N : P of legumes were higher than in other functional groups. There was no significant difference in the leaf P concentrations on an area basis among different life forms or functional groups. Our findings indicate that appropriately increasing the proportion of legume plants would improve both the yield and quality of primary productivity in Songnen grassland.

Key words: ecological stoichiometry, leaf nitrogen (N) and phosphorus (P) concentration, N : P, plant functional group, Songnen grassland