首页|祁连山北坡天然草地地下生物量及其与环境因子的关系

祁连山北坡天然草地地下生物量及其与环境因子的关系

扫码查看
原文链接
  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
  • 维普
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.
Belowground biomass and its relationship to environmental factors of natural grassland on the northern slopes of the Qilian Mountains
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 dis tribution. 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 A5%. 4) There were negative correlations between the belowground bio masses 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 bio masses 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 dif ferent grasslands and environmental factors was very varied.

natural grasslandbelowground biomassnet productivityturnover valueenvironment factor

黄德青、于兰、张耀生、赵新全

展开 >

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

桂林师范高等专科学校化工系,广西桂林541002

桂林医学院基础医学院,广西桂林541004

天然草地 地下生物量 净生产量 周转值 环境因子

国家科技支撑计划国家科技支撑计划中国科学院西部行动计划项目中国科学院知识创新工程重大项目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

2009BAC61B03-12006BAC01 A02KZCX2XB20601kzcxl-09-01cjc020144

2011

草业学报
中国草原学会 兰州大学草地农业科技学院

草业学报

CSTPCDCSCD北大核心
影响因子：4.082
ISSN：1004-5759
年,卷(期)：2011.20(5)
  • 43
  • 19