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草业学报 ›› 2011, Vol. 20 ›› Issue (5): 1-10.

• 研究论文 •    下一篇

祁连山北坡天然草地地下生物量及其与环境因子的关系

黄德青1,2,于兰3,张耀生1*,赵新全1   

  1. 1.中国科学院西北高原生物研究所 高原生物适应与进化重点实验室, 青海 西宁 810001;
    2.桂林师范高等专科学校化工系, 广西 桂林 541002;
    3.桂林医学院基础医学院, 广西 桂林 541004
  • 出版日期:2011-10-20 发布日期:2011-10-20
  • 通讯作者: E-mail:zys@nwipb.ac.cn
  • 作者简介:黄德青(1980-), 男, 山东定陶人, 讲师。
  • 基金资助:
    国家科技支撑计划项目(2009BAC61B03-1,2006BAC01A02),中国科学院西部行动计划项目(KZCX2XB20601),中国科学院知识创新工程重大项目(kzcx1-09-01)和中国科学院西北高原生物研究所知识创新重点研究领域项目(cjc020144)资助。

Belowground biomass and its relationship to environmental factors of natural grassland on the northern slopes of the Qilian Mountains

HUANG De-qing1,2, YU Lan3, ZHANG Yao-sheng1, ZHAO Xin-quan1   

  1. 1.Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Key Laboratory of Adaptation and Evolution of Plateau Biota, Xining 810001, China;
    2.Department of Chemistry and Technology, Guilin Normal College, Guilin 541002, China;
    3.School of Basic Medicine Science, Guilin Medical College, Guilin 541004, China
  • Online:2011-10-20 Published:2011-10-20

摘要: 祁连山北坡天然草地植被以高寒草原、山地草甸、山地草甸草原、山地草原和山地荒漠草原等类型为主,对这五类天然草地地下生物量及与环境因子关系的分析结果显示,五类草地的地下生物量除山地草原、山地草甸草原和高寒草原无显著差异外,其他各类草地间差异显著(P<0.05),均呈“T”形分布,且随土层深度的加深呈指数形式递减;地下生物量季节变化在高寒草原表现为“W”型变化规律,其他各类草地均呈“N”型变化规律,且随土层深度的加深依次减小;地下净生产量大小依次为山地草甸(546.84 g/m2)>山地草甸草原(410.76 g/m2)>山地草原(358.12 g/m2)>高寒草原(301.33 g/m2)>山地荒漠草原(81.68 g/m2),地下生物量的周转值均在45%以上;五类草地地下生物量与水热因子的关系为负相关关系,但均没有达到显著相关水平(P>0.05)(除山地荒漠草原外), 但在水热条件较好的7-8月份,五类草地地下生物量与水热因子的相关性(正相关或负相关)均达极显著水平(P<0.01),而在其他月份,不同类型草地地下生物量对环境因子的响应存在较大差异。

Abstract: The belowground biomass and its relationships with environmental factors of natural grassland: alpine steppe, mountain meadow, mountain meadow steppe, mountain steppe and mountain-desert grassland of the northern slopes of the Qilian mountains were investigated. 1) The belowground biomasses of five kinds of grassland differed significantly (P<0.05) except for mountain steppe, mountain meadow steppe, and alpine steppe. The belowground biomass reduced with soil depth in an exponential manner and with a “T” shape distribution. 2) Seasonal change of the belowground biomass was of a “W” type in alpine steppe and of a “N” type in other grasslands, and decreased with soil depth. 3) Below ground net productivity of mountain meadow was the highest (546.84 g/m2), and was followed by mountain meadow steppe (410.76 g/m2), mountain steppe (358.12 g/m2), alpine steppe (301.33 g/m2) and mountain-desert grassland (81.68 g/m2). Turnover value of the belowground biomass was beyond 45%. 4) There were negative correlations between the belowground biomasses of five kinds of grassland and the hydrothermal factor, though the correlations were not significant except for mountain-desert grassland. But the correlations (positive or negative) between the belowground biomasses of five kinds of grassland and the hydrothermal factor were highly significant in the 7-8 months with better hydrothermal conditions. In other months, the correlations between the belowground biomasses of different grasslands and environmental factors was very varied.

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