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

作　　者：徐同庆[1,2] 徐宜民[1] 孙薇 王程栋[1] 胡海洲[1] 刘光亮[1] 王树声[1] 陶健 XU Tongqing1,2, XU Yimin1, SUN Wei3, WANG Chengdong1, HU Haizhou1, LIU Guangliang1, WANG Shusheng1, TAO Jian4(1. Tobacco Research Institute of CAAS, Qingdao 266101, Shandong, China 2. Graduate School of CAAS, Beijing 100081, China 3. College of Agronomy, Qingdao Agricultural University, Qingdao 266109, Shandong, China 4. College of Public Administration,Shandong Technology and Business University,Yantai 264005, Shandong, Chin)

机构地区：[1]中国农业科学院烟草研究所 [2]中国农业科学院研究生院,北京中关村南大街12号100081 [3]青岛农业大学农学院 [4]山东工商学院公共管理学院

出　　处：《烟草科技》2018年第3期15-23,共9页Tobacco Science & Technology

基　　金：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);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)

摘　　要：为了明确水碳通量在烤烟不同生育期对生物和非生物因子的响应规律,进而分析烟田水碳通量变化的时间敏感性,基于涡度相关通量观测数据研究了攀枝花-西昌(攀西)地区典型烟田水碳通量在烤烟不同生育期的日间变化特征,并结合冠层导度、气温、饱和水汽压差(VPD)及净辐射揭示了水碳通量变化的时间不对称性。结果表明:烤烟生育期中除还苗期和成熟期Ⅲ外,其他生育期CO_2通量和蒸散量(ET)日间均呈现"双峰"变化曲线,中午11:00—13:00时期间有小幅度下降或增速放缓;相同净辐射强度下,每日下午的CO_2通量和ET值均明显大于上午,而冠层导度则表现出相反的特征;上午较低气温和VPD抑制了冠层导度和净辐射对水碳交换的正向调控作用,而下午相对较高气温和VPD又弥补了冠层导度和净辐射下降对水碳交换的影响。因此,气温、VPD及净辐射在日间的非同步变化是导致烟田水碳通量日间非对称响应的主要外界因素。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 CO2 flux 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 CO2 flux 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 

分 类 号：S572.01[农业科学—烟草工业]