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5种天然草地地上生物量观测结果显示,地上生物量在5类草地植物群落间差异显著(P<0.05),其季节动态规律均表现为单峰型,在8月下旬达生物量峰值。5种草地类型地上生物量以山地草甸(100.24 g/m2)最高,其他依次为山地草甸草原(71.24 g/m2)、山地草原(70.20 g/m2)、高寒草原(52.40 g/m2)和山地荒漠草原(20.44 g/m2);用Logistic方程模拟的地上生物量增长曲线表明5类草地群落地上生物量均未达到其环境最大容纳量。不同草地类型地上生物量与降水量、土壤平均含水量的累加值均呈正相关关系。在各种类型草地中,不同土层含水量对地上生物量的影响均不同,根系主要分布层内的含水量与地上生物量显著相关(P<0.05)。
Based on the research on the above-ground biomass of natural grassland： alpine pastureland,mountainous meadow,mountainous meadow rangeland,mountainous pastureland,mountainous desert rangeland in the northern slopes of the Mountains Qilian,the results showed that the difference of aboveground biomass among five grassland was significant（P〈0.05）,but the curve of seasonal dynamic of aboveground biomass was single apex type and variation trend were same,and it reached the peak value in August.The above-ground biomass of mountainous meadow（100.24 g/m2） is the highest in five vegetation types,and others are in order of mountainous meadow rangeland（71.24 g/m2）,mountainous pastureland（70.20 g/m2）,alpine pastureland（52.40 g/m2）,and mountainous desert rangeland（20.44 g/m2）.The result of the Logistic model of above-ground biomass growth curve showed that all grassland types did not reach its maximum the environment can support.The above-ground biomass of different type grassland positively correlated to the accumulated value of precipitation and mean soil moisture.Soil moisture of different soil layers had different impact on the aboveground biomass,but the soil moisture within root distributed soil layers had same impact on aboveground biomass in all grasslands（P〈0.05）.
出处
《草业学报》
CSCD
北大核心
2011年第3期20-27,共8页
Acta Prataculturae 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)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
关键词
祁连山
天然草地
地上生物量
土壤水分
Mountains Qilian
natural grassland
above-ground biomass
soil moisture
