自然资源学报 ›› 2017, Vol. 32 ›› Issue (2): 210-222.doi: 10.11849/zrzyxb.20160228

• 资源生态 • 上一篇    下一篇

青藏高寒草地植被生产力与生物多样性的经度格局

朱桂丽1, 2, 李杰3, 魏学红1, *, 何念鹏2, *   

  1. 1. 西藏农牧学院,西藏 林芝 860000;
    2. 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室,北京 100101;
    3. 东北师范大学草地科学研究所,长春 130024
  • 收稿日期:2016-03-08 出版日期:2017-02-15 发布日期:2017-02-15
  • 作者简介:朱桂丽(1989- ),女,河南新乡人,硕士研究生,研究方向为高寒草地生态学。E-mail: 1414849176@qq.com *通信作者简介:魏学红(1968- ),男,教授,研究方向为高寒草地生态。E-mail: wxueh@yahoo.com.cn *通信作者简介:何念鹏(1976- ),男,研究员,研究方向为生物地球化学、化学计量生态学、样带研究、全球变化与陆地生态系统。E-mail: henp@igsnrr.ac.cn
  • 基金资助:
    国家自然科学基金项目(31470506); 中国科学院地理科学与资源研究所可桢青年杰出人才项目(2013RC102)

Longitudinal Patterns of Productivity and Plant Diversity in Tibetan Alpine Grasslands

ZHU Gui-li1, 2, LI Jie3, WEI Xue-hong1, HE Nian-peng2   

  1. 1. Xizang Agriculture and Animal Husbandry College, Linzhi 860000, China;
    2. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    3. Institute of Grassland Sciences, Northeast Normal University, Changchun 130024, China
  • Received:2016-03-08 Online:2017-02-15 Published:2017-02-15
  • Supported by:
    National Natural Science Foundation of China, No. 31470506; Young Talents Program by Institute of Geographical Sciences and Natural Resources Research, CAS, No. 2013RC102. ]

摘要: 沿昌都到噶尔县的经度梯度,对西藏典型高寒草地植被生产力与植物多样性开展了1 700 km的野外样带调查。实验结果表明:高寒草地的群落结构特征(地上生物量、地下生物量、盖度和密度)与生物多样性(物种丰富度、物种多样性和物种均匀度)均具有明显的经度分布格局。整体而言,这些特征参数均表现出自西向东沿荒漠草原—典型草原—草甸草原呈逐渐递增的趋势;其经度格局主要受降雨量和平均气温所趋动,但降雨量和平均温度的影响在不同指标间存在较大差异;地上生物量由二者共同决定,而物种丰富度受降雨量的影响更大。西藏高寒草地的物种丰富度与地上生物量间存在显著的幂指数关系(y=0.219 7 x 0.754 9, R2= 0.61, P< 0.01)。上述规律的发现,不仅有利于我们更好地理解高寒草地对未来气候变化的响应机制与适应途径,也将帮助我们合理制定放牧策略以实现该地区高寒草地的可持续发展。

关键词: 地上生物量, 地下生物量, 高寒草地, 物种多样性

Abstract: In this study, we conducted an integrative field investigation for the grassland community, productivity, and plant diversity in the Tibetan Plateau grasslands along a 1 700-km west-east transect. The properties of plant communities (e.g., aboveground biomass, belowground biomass, coverage, and density) and indices of plant diversity (e.g., richness index, Shannon-Wiener diversity index, and Pielou evenness index) showed longitudinal patterns along the west-east transect. All these indices increased significantly from the alpine desert, alpine meadow steppe, to alpine meadow in the Tibetan Plateau. Climatic factors (mean annual temperature (MAT) and mean annual precipitation (MAP) were the main factors controlling these longitudinal patterns, but their relative contributions to different parameters differed. MAT and MAP both controlled aboveground biomass, but the influence of MAP on plant richness was much higher than that of MAT. There was significant power-function relation between aboveground biomass and plant richness in the Tibetan Plateau grasslands ( y=0.219 7x0.754 9, R2=0.61, P<0.01). These findings provide insights into the response and feedback of Tibetan Plateau grasslands to the climate change in the future, and may help us to effectively protect the Tibetan Plateau grasslands and promote its sustainable development.

Key words: aboveground biomass, alpine steppe, belowground biomass, plant diversity

中图分类号: 

  • Q948