中国烟草学报2017，Vol.23Issue(3)：72-79,8.DOI:10.16472/j.chinatobacco.2017.010
攀西干热河谷烟田烤烟成熟初期水碳通量日间变化的非对称响应
Asymmetric response character of diurnal variation of water and carbon fluxes at initial mature stage of flue-cured tobacco in Panxi dry and hot valley tobacco planting area
摘要
Abstract
Investigating asymmetric-response characteristics of diumal water-carbon flux in tobacco field ecosystem is helpful to evaluate relationships between key environmental factors and water-carbon flux.Based on flux observation data during initial mature stage in Pan Zhihua-Xi Chang (Pan-xi) dry and hot valley tobacco planting area,the diurnal dynamic of canopy conductance and water-carbon flux and their asymmetric responses to environmental factors were explored.Results showed that water-carbon flux had a midday depression during initial mature stage,and change of canopy conductance was the direct factor affecting diurnal dynamic of water-carbon flux.Under the same net radiation intensity,CO2 flux and ET were significantly higher in the afternoon than in the morning,while the response of WUE to net radiation was related to the intensity of net radiation:when net radiation was less than 230W·m-2,the WUE was higher in the afternoon;when net radiation was greater than 230 W·m2,the WUE was higher in the morning.The asynchronous change between air temperature,VPD and net radiation was the main meteorological factors leading to the asymmetry distribution of canopy conductance and ET in the morning and afternoon.Thus,the dynamic characteristics of water-carbon fluxes were indirectly affected.Through exploration of nonsymmetrical response characteristics of water-carbon flux to environmental factors,the study can provide theoretical basis and data support for further analysis on water-carbon flux and its driving mechanism in Pan-xi dry and hot valley tobacco planting area.关键词
烟田生态系统/水、碳通量/非对称响应/攀西干热河谷Key words
tobacco field ecosystem/water-carbon flux/asymmetric response/Pan-xi dry and hot valley引用本文复制引用
徐同庆,徐宜民,孟霖,胡海洲,王程栋,周立新,刘光亮,董建新,陶健..攀西干热河谷烟田烤烟成熟初期水碳通量日间变化的非对称响应[J].中国烟草学报,2017,23(3):72-79,8.基金项目
国家自然科学基金青年科学基金项目(41501054) （41501054）
中国农业科学院烟草研究所青年科学基金项目(2015A02) （2015A02）
中国农业科学院科技创新工程(ASTIP-TRIC03) （ASTIP-TRIC03）
