摘要
2017年利用Lysimeter蒸散仪对不同覆被和人类干扰下祁连山亚高山草地实际蒸散发进行观测.结果表明,日尺度上蒸发量,水面最大,平均为5.71 mm/d,裸土最小,为2.75 mm/d.3种不同覆被条件下(自然状态、垂穗披碱草群落和水面)的蒸发差距不大.模拟人类干扰下(重度放牧、中度放牧、轻度放牧和自然状态),中度放牧日蒸散发量最大,平均为5.10 mm/d,其次为自然状态下的,平均为4.41 mm/d,轻度和重度放牧的相互交替,4种情况下日蒸散发量差距不大.小时尺度上蒸散发量,自然状态较大,中度放牧下变化较大,轻度和重度放牧下较小.自然条件下,小时蒸散发量与空气温度和净辐射呈显著正相关关系,与相对湿度呈显著负相关关系,与风速无显著性关系.
Lysimeters were used to measure the evapotranspiration of subalpine meadow in the middle part of Qilian Mountains under different coverages and human activities in 2017.The results showed that the water surface evaporation was the highest with the average daily evaporation being 5.71 mm/d.The bare soil evaporation was the lowest with the average daily being 2.75 mm/d.There was little difference among the evapotranspiration(evaporation)of water,natural and Elymus nutans community.Under human activities(i.e.,heavy,moderate and light grazings,and control experiment),the daily evapotranspiration in the moderate grazing was higher than that in other human activities,which was 5.10 mm/d.There was no significant difference among four human activities.On the hourly scale,evapotranspiration in the control experiment was the largest,and change of evapotranspiration under the moderate grazing was larger.Under the control experiment,the relationship between hourly evapotranspiration and air temperature and relative humidity was significant.The hourly evapotranspiration had a significant positive correlation with air temperature and net radiation,and a significant negative correlation with relative humidity;the relationship between hourly evapotranspiration and wind was poor.
作者
高云飞
赵传燕
戎战磊
刘俊杰
毛亚花
郭朝霞
Gao Yun-fei;Zhao Chuan-yan;Rong Zhan-lei;Liu Jun-jie;Mao Ya-hua;Guo Zhao-xia(State Key Laboratory of Grassland Agro-ecosystems,School of Life Science,Lanzhou University,Lanzhou 730000,China;State Key Laboratory of Grassland Agro-ecosystems,College of Pastoral Agriculture Science and Technology,Lanzhou University,Lanzhou 730020,China;College of Geographical Science,Academy of Plateau Science and Sustainability,Qinghai Research Center of Qilian Mountain National Park,Qinghai Normal University,Xining 810008,China;Key Laboratoryof Oasis Ecology of the Ministry of Education,College of Resource and Environmental Science,Xinjiang University,Urumqi 830046,China)
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第3期356-362,共7页
Journal of Lanzhou University(Natural Sciences)
基金
国家自然科学基金面上项目(41571051)
干旱气象科学研究基金项目(IAM201608)
中央高校基本科研业务费专项资金(lzujbky-2017-it09)
关键词
蒸散发
覆被
人类干扰
亚高山草地
祁连山
evapotranspiration
land coverage
human activity
subalpine meadow
Qilian Mountain
