祁连山北坡5类天然草地地上部数量特征及其与环境因子的关系  

Aboveground Numerical Characteristics of Five Natural Grassland and Their Relationships to Environmental Factors in the Northern Slopes of the Mountains Qilian

作　　者：黄德青[1,2] 于兰[3] 张耀生[1] 赵新全[1] 

机构地区：[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,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　　处：《西北农业学报》2011年第6期174-180,共7页Acta Agriculturae Boreali-occidentalis Sinica

基　　金：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);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)

摘　　要：利用祁连山北坡5类天然草地调查数据和同期的气象资料,分析其地上部数量特征及其与环境因子的关系。结果表明,5类草地的地上生物量、植被盖度均存在显著差异(P<0.05),表现为山地草甸>山地草甸草原>山地草原>高寒草原>山地荒漠草原;各草地群落地上生物量、高度和盖度的季节变化均呈单峰型,且峰值均出现在8月下旬;地上生物量与植被盖度显著相关(P<0.05),与群落高度(除山地草甸外)极显著相关(P<0.01),说明地上生物量随植被盖度和高度的增加而增大;各草地群落高度在达到最大值之前,均基本符合Logistic生长模型(P>0.01);地上生物量与同期水热因子的相关性均不显著(P>0.05),各草地群落高度和植被盖度对水热因子的敏感性存在差异。We analyzed the aboveground numerical characteristics of natural grasslands and their relationships to environmental factors by means of the aboveground survey data of five natural grasslands and synchronous meteorological data in the northern slopes of the Qilian Mountain.The results indicated that the difference of the aboveground biomass and vegetation coverage among five kinds grasslands was significant（P〈0.05）.Sequence for the aboveground biomass and vegetation ranked as follows：mountainous meadow,mountainous meadow rangeland,mountainous pastureland,alpine pastureland,and mountainous desert rangeland;The seasonal dynamic of aboveground biomass,community height and vegetation coverage all appear to be single apex type and their values came to the peak in late August;The growth of the aboveground biomass was significantly correlated with the vegetation coverage（P〈0.05）,and more prominently with the community height（except for mountainous meadow）（P〈0.01）.It implied that the aboveground biomass significantly increased with the increase of the vegetation coverage and the community height;The growth of plant community height basically accorded with Logistic models before it reached to the maximum（P〈0.01）;（5）The aboveground biomass were not significantly correlated with synchronous climate factors（P〈0.05）.The sensitivities of vegetation coverage and community height to climate factors were different in five grassland types.

关 键 词：祁连山 天然草地 地上生物量 群落高度 植被盖度 环境因子 

分 类 号：S812[农业科学—草业科学]