| 沙地玉米水分利用效率日变化特征 |
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| 引用本文： | 牛亚毅,李玉强,王旭洋,龚相文,杨欢.沙地玉米水分利用效率日变化特征[J].中国沙漠,2019,39(1):142-148. |
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| 作者姓名： | 牛亚毅 李玉强 王旭洋 龚相文 杨欢 |
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| 作者单位： | 1. 中国科学院西北生态环境资源研究院, 甘肃 兰州 730000;2. 中国科学院大学, 北京 100049 |
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| 基金项目： | 国家重点研发计划项目（2016YFC0500901）；中国科学院“百人计划”项目（Y551821）；国家自然科学基金项目（31640012，31560161） |
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| 摘 要： | 以科尔沁沙地玉米农田生态系统为研究对象，利用涡度相关技术和便携式光合作用测定系统（LI-COR6400）同步观测玉米（郑单958）主要生育期（苗期、拔节期、抽穗期、灌浆期和成熟期）群体和叶片尺度瞬时CO2交换及水汽交换速率，并分析其水分利用效率的日变化特征。结果表明：各生育期玉米群体尺度瞬时CO2交换速率分别为-2.205、-26.113、-26.118、-8.201、-3.672 μmolCO2·m-2·s-1，叶片尺度光合速率分别为27.57、59.55、24.38、22.03、20.09 μmolCO2·m-2·s-1。各生育期群体水分利用效率（WUEC）的日动态呈现“L”型，峰值出现在日出后（约06：00），分别为0.025、0.039、0.088、0.058、0.191 gCO2·g-1H2O，叶片尺度瞬时水分利用效率（WUEL）的日动态呈“~”型，峰值出现在06：00—10：00，分别为0.029、0.041、0.017、0.019、0.024 gCO2·g-1H2O。玉米各生育期群体及叶片尺度瞬时CO2交换速率和水分利用效率均存在明显差异。
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| 关 键 词： | 玉米 叶片 群体 日动态 瞬时水分利用效率 |
| 收稿时间： | 2017-12-05 |
| 修稿时间： | 2018-01-12 |
Characteristics of Diurnal Variation of Water Use Efficiency of Maize in Sandy Land |
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| Niu Yayi,Li Yuqiang,Wang Xuyang,Gong Xiangwen,Yang Huan.Characteristics of Diurnal Variation of Water Use Efficiency of Maize in Sandy Land[J].Journal of Desert Research,2019,39(1):142-148. |
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| Authors: | Niu Yayi Li Yuqiang Wang Xuyang Gong Xiangwen Yang Huan |
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| Institution: | 1. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Based on the eddy covariance system and LI-COR6400 infrared gas analysis meter, the present study simultaneously investigated instantaneous CO2 and H2O exchange rate, and analyzed instantaneous water use efficiency in agriculture ecosystem with corn land during main period phases, including seedling stage, jointing stage, heading stage, grain-filling stage, and maturity stage in Horqin Sandy Land. The results showed that a "L" pattern of the diurnal with respect to instantaneous water use efficiency (WUEC) at the colony scale could be presented, the peaks were observed after sunrise (about 06:00) of which sizes were 0.025, 0.039, 0.088, 0.058 and 0.191 gCO2·g-1H2O, respectively, a "~" pattern of the diurnal dynamics of leaf instantaneous water use efficiency (WUEL) occurred, the peaks appeared during 06:00-10:00, with sizes of 0.029, 0.041, 0.017, 0.019 and 0.024 gCO2·g-1H2O. The exchange rates of instantaneous carbon dioxide at the colony scale were -2.205, -26.113, -26.118, -8.201 and -3.672 μmolCO2·m-2·s-1, while the leaf scale were 27.57, 59.55, 24.38, 22.03 and 20.09 μmolCO2·m-2·s-1. Significant difference was obtained in instantaneous gas exchange and water use efficiency for summer corn colony and leaf scales at different growth stages. |
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| Keywords: | maize leaf canopy daily dynamics instantaneous water use efficiency |
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