摘要
在祁连山冷龙岭南坡3 200 m到4 200 m建立样带,每200 m为梯度设置7个样地,利用微气象自动观测仪观测气温和土壤温度,同时调查样带植物群落、种类组成及地上生物量等。结果表明,气温日变化幅度随海拔的升高而减小,气温随海拔增加降低明显,年平均气温直减率0.51℃/100 m,不同季节直减率有所不同。日平均气温稳定≥0℃、≥3℃和≥5℃的积温直减率几乎相同,为92℃/100 m,持续天数直减率9 d/100 m。土壤表层温度随海拔变化具有与气温相近的变化趋势。依植被景观及气候特点可将祁连山冷龙岭南坡分为亚高山高寒草甸、亚高山灌丛、高山草甸及高山冰雪稀疏植被气候带。观测植被区地上生物量表明,植被地上年净初级生产力随海拔升高而降低。
Based on microclimatic auto observation systems, the air and soil temperature were measured at 30 mi- nutes intervals in seven equidistant plots from 3 200 meters to 4 200 meters on the southern slope of Lenglongling, Qilian Mountains. Meanwhile, the plant community of the plot was investigated, such as species composition, aver- age height and aboveground biomass. The results showed that the fluctuation of diurnal air temperature and the tem- perature decreased obviously, along with the ascension of altitude. The decline rate of the annual average tempera- ture was 0.51 ℃/100 m, and that of different seasons was variational somewhat. The accumulative temperature for ≥0℃, ≥3℃and ≥5℃ had almost the same decline rate which was 92℃/100 m. The decline rate of the lasting days was 9 d/100 m. The soil surface temperature and air temperature had the similar trend. Accord with vegeta- tion landscape and climate characteristics, we divided the plant community in the southern slope of Lenglongling, Qilian Mountains into sub-alpine meadow climatic zone, sub-alpine shrub-meadow climatic zone, alpine meadow, alpine sub-snow ice sparse vegetation climatic zone. The aboveground biomass of vegetation zones showed that aboveground annual net primary productivity decreased with the ascension of altitude.
出处
《山地学报》
CSCD
北大核心
2009年第4期418-426,共9页
Mountain Research
基金
中国科学院西部行动计划项目(KZCX2-XB2-06-01)
国家科技部支撑项目(2006BAC08B02)
中科院西北高原生物研究所百人计划项目~~
关键词
气温
土壤温度
海拔梯度
气候带
生产力
air temperature
soil temperature
elevation
climatic zone
productivity
