摘要
【目的】探究干旱绿洲区典型农田生态系统作物蒸腾蒸散特征及蒸腾占总蒸散的比值,为T/ET的研究提供数据支撑。【方法】联合运用树干液流(包裹式)、涡度相关法以及微气象观测系统于整个生长季(5—10月)对敦煌沙漠绿洲区无核白葡萄树(Vitis vinifera L.)的冠层蒸腾(Transpiration,T)和总蒸散(Evapotranspiration,ET)特征进行了连续测定;并分析了不同生态系统及不同观测模拟手段下蒸散发的分割结果。【结果】生长季中,冠层蒸腾量从0.20 mm/d上升到生长中期的8.13 mm/d,然后逐渐下降至末期落叶时到达极小值,日均蒸腾量为3.32 mm/d。总蒸散发量由0.44 mm/d增加到9.97 mm/d,然后逐渐下降至末期到达极小值,日均总蒸散量为4.91 mm/d。生长季冠层蒸腾量(T)占总蒸散量(ET)的值(T/ET)约为63.5%。【结论】生长季内,干旱绿洲区农田系统无核白葡萄树冠层蒸腾是总蒸散的主要水分通量。
【Objective】The ratio of transpiration(T)to evapotranspiration(ET)varies with plants and their growth stages.The aim of this paper is to experimentally study T and ET,as well as their temporal variations.【Method】The experiment was conducted at a grapevine vineyard in an arid oasis in northwestern China.The transpiration and evapotranspiration of the grapevines(Vitis vinifera L.)were measured using sap-flow sensor,microclimatic station and eddy-covariance methods,respectively,at different growth stages.【Result】During the whole growth season,the transpiration increased from the initial 0.20 mm/d to 8.13 mm/d at the middle of growth season;it then dropped gradually to 3.32 mm/d when the leaves started falling.In comparison,the associated evapotranspiration increased from initial 0.44 mm/d to 9.97 mm/d before gradually decreasing to 4.91 mm/d.The average T/ET ratio was approximately 63.5%.【Conclusion】Transpiration is the dominant soil water loss during the growth season of the grapevines(Vitis vinifera L.)in arid oasis in northwestern China.
作者
王尚涛
赵楠
张扬
张琨
朱高峰
WANG Shangtao;ZHAO Nan;ZHANG Yang;ZHANG Kun;ZHU Gaofeng(School of Water Resources and Electric Power,Qinghai University,Xining 810016,China;Key Laboratory of Western China’s Environmental Systems with the Ministry of Education,College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China;Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China)
出处
《灌溉排水学报》
CSCD
北大核心
2021年第12期1-6,共6页
Journal of Irrigation and Drainage
基金
国家自然科学基金面上项目(41871078)
国家重点研发计划重点专项项目(2018YFC0406602)
青海省重点研发与转化计划项目(2021-SF-134)。
关键词
干旱绿洲区
无核白葡萄
树干液流
涡度相关
T/ET
arid oasis area
Vitis vinifera L.
sap flow
eddy covariance
transpiration-evapotranspiration ratio
