冬小麦农田尺度瞬态CO2通量与水分利用效率日变化及影响因素分析 | |
郭家选; 李玉中; 梅旭荣 | |
刊名 | 中国生态农业学报 |
2006 | |
卷号 | 14期号:3页码:78-81 |
关键词 | 涡度相关法 CO2通量 水分利用效率 |
ISSN号 | 1671-3990 |
其他题名 | Diurnal variation of instantaneous carbon dioxide flux and water use efficiency of winter wheat at field scale and analysis of influencing factors |
英文摘要 | 以华北平原冬小麦农田尺度为研究对象,采用涡度相关技术,研究冬小麦灌浆期瞬态CO2通量日变化特征及其与农田热量平衡各分量的关系。结果表明,非水分胁迫下CO2通量日变化(负值表示通量指向冠层)为U型,群体净光合速率最高值为-1.2~-1.4mg/m^2·S,夜间瞬态CO2通量呈非稳定变化,最高值达0.4~0.54mg/m^2·S。白天时段内CO2通量与净辐射、潜热通量呈高度相关,8:00~15:30时段内CO2和水汽通量呈同步日变化趋势,水分利用效率处于稳定状态,瞬态水分利用效率基本维持在0.012~0.014g(CO2)/g(H2O)范围内;但早晨和傍晚时段内水分利用效率变化较大。; The diurnal variation of instantaneous carbon dioxide flux and the relationship between it and components of farmland energy balance during grain filling stage of winter wheat by eddy correlation technique were studied. The results show that the curve of instantaneous carbon dioxide flux in diurnal course is U-shape, the maximal net photosynthetic rate in crop canopy level ranges from - 1.2mg/m^2·s to - 1.4mg/m^2·s under no soil water-stress condition during daytime, and during nocturnal periods COz fluxes are erratic and the maximal carbon dioxide ranges from 0.40mg/m^2 ·s to 0,54mg/m^2·s. Carbon dioxide fluxes are closely related to net radiation flux, and latent heat flux during daytime period. Moreover, there is synchronous trend both carbon dioxide flux and latent heat flux during 8:00-15:30 period, so crop WUE is stable, and it is approximately 0. 012 - 0. 014g(CO2 )/g(H2o). But instantaneous WUE changes largely around sunrise and sunset. |
学科主题 | 大气科学(气象学) ; 林业 |
语种 | 中文 |
内容类型 | 期刊论文 |
源URL | [http://111.203.20.206/handle/2HMLN22E/17473] |
专题 | 农业环境与可持续发展研究所 |
作者单位 | 中国农业科学院农业环境与可持续发展研究所, 北京, 100081 |
推荐引用方式 GB/T 7714 | 郭家选,李玉中,梅旭荣. 冬小麦农田尺度瞬态CO2通量与水分利用效率日变化及影响因素分析[J]. 中国生态农业学报,2006,14(3):78-81. |
APA | 郭家选,李玉中,&梅旭荣.(2006).冬小麦农田尺度瞬态CO2通量与水分利用效率日变化及影响因素分析.中国生态农业学报,14(3),78-81. |
MLA | 郭家选,et al."冬小麦农田尺度瞬态CO2通量与水分利用效率日变化及影响因素分析".中国生态农业学报 14.3(2006):78-81. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论