植物生态学报 ›› 2004, Vol. 28 ›› Issue (2): 240-245.DOI: 10.17521/cjpe.2004.0035

• 论文 • 上一篇    下一篇

高寒草甸群落植物多样性和初级生产力沿海拔梯度变化的研究

王长庭, 王启基, 龙瑞军, 景增春, 史惠兰   

  • 发布日期:2004-02-10
  • 通讯作者: 王长庭

CHANGES IN PLANT SPECIES DIVERSITY AND PRODUCTIVITY ALONG AN ELEVATION GRADIENT IN AN ALPINE MEADOW

WANG Chang-Ting, WANG Qi-Ji, LONG Rui-Jun, JING Zeng-Chun, SHI Hui-Lan   

  • Published:2004-02-10
  • Contact: WANG Chang-Ting

摘要:

对不同海拔梯度高寒草甸群落植物多样性和初级生产力关系的研究结果表明:1)不同海拔梯度上,中间海拔梯度群落植物多样性最高,即物种丰富度、均匀度和多样性最大;2)不同海拔梯度上,群落生产力水平和物种丰富度中等时,物种多样性最高;3)随着海拔的逐渐升高,地上生物量逐渐减少;4)地下生物量具有“V”字形季节变化规律,在牧草返青期和枯黄期地下生物量最大,7月最小,且地下生物量主要分布在0~10 cm的土层中。地下生物量垂直分布呈明显的倒金字塔特征。

Abstract:

Understanding the relationship between biodiversity and ecosystem function is central to the Global Change and Terrestrial Ecosystem (GCTE) project as well as to ecosystem ecology in general. Productivity and nutrient maintenance, both critical ecosystem functions, can be measured in relation to species diversity to test how ecosystem functions are affected by species diversity. We studied changes in species diversity and productivity along elevational gradients in alpine meadow grasslands to assess the influence of changing species diversity on productivity.The results show a significant unimodal pattern of species diversity across the elevation gradient with species diversity highest at mid-elevations. Maximum species diversity occurred at intermediate levels of productivity and species richness. Above-ground biomass decreased with increasing elevation and below-ground biomass was greatest at low and high elevations and lowest at mid-elevations. Below-ground biomass varied during the growing season and vertically within the soil profile: maximum underground biomass occurred at the beginning and end of plant growing and was distributed primarily in the top 0-10 cm of soil.