烟草科技2018，Vol.51Issue(3)：15-23,9.
攀西典型烟田水碳通量变化的时间敏感性分析
Temporal sensitivity analysis of water variation and carbon fluxes in typical flue-cured tobacco fields in Pan-xi
摘要
Abstract
To determine the response of water and carbon fluxes to biological and abiotic factors at different growth stages of flue-cured tobacco and further to analyze the temporal sensitivity of variation of water and carbon fluxes, the diurnal variation characteristics in typical flue-cured tobacco fields in Panzhihua-Xichang (Pan-xi) were studied at different growth stages of flue-cured tobacco based on the eddy covariance data. The asymmetric response to time in variation of water and carbon fluxes was measured according to canopy conductance, atmospheric temperature, vapor pressure difference (VPD) and net radiation. The results showed that except for seedling and maturity Ⅲ stages, the variation of both CO2flux and evapotranspiration (ET) presented a bimodal curve during a day at the other tobacco growing stages, which became slightly decline or slowdown from 11:00 to 13:00. At the same net radiation intensity, the values of CO2flux and ET in the afternoon were significantly higher than those in the morning, which was contrary to canopy conductance. In the morning, lower temperatures and VPD inhibited the positive regulation effects of canopy conductance and net radiation on water and carbon exchange. However, in the afternoon, higher temperature and VPD compensated the effects of decrease of canopy conductance and net radiation on water and carbon exchange. Therefore, the diurnally non-synchronous variations of temperature, VPD and net radiation were found to be the main external factors causing the diurnally asymmetric response of water and carbon fluxes in tobacco fields.关键词
攀西/烟田/生态系统/水碳通量/环境因子/非对称响应Key words
Pan-xi/Tobacco field/Ecosystem/Water and carbon flux/Environmental factor/Asymmetric response分类
农业科技引用本文复制引用
徐同庆,徐宜民,孙薇,王程栋,胡海洲,刘光亮,王树声,陶健..攀西典型烟田水碳通量变化的时间敏感性分析[J].烟草科技,2018,51(3):15-23,9.基金项目
国家自然科学基金青年科学基金项目"云贵高原农田生产力对气候变化响应的海拔敏感性研究"(41501054) （41501054）
中国农业科学院烟草研究所青年科学基金项目"川贵地区烟田生产力对气候变化的响应研究"(2015A02). （2015A02）
