| 大气CO_2倍增条件下冬小麦气体交换对高温干旱及复水过程的响应 |
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| 引用本文： | 郭丽丽,张茜茜,郝立华,乔雅君,陈文娜,卢云泽,李菲,曹旭,王清涛,郑云普. 大气CO_2倍增条件下冬小麦气体交换对高温干旱及复水过程的响应[J]. 作物学报, 2019, 45(6): 949-956. DOI: 10.3724/SP.J.1006.2019.81081 |
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| 作者姓名： | 郭丽丽 张茜茜 郝立华 乔雅君 陈文娜 卢云泽 李菲 曹旭 王清涛 郑云普 |
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| 作者单位： | 河北工程大学水利水电学院;河北雄安新区生态环境局;河北工程大学园林与生态工程学院 |
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| 基金项目： | This study was supported by the National Key Research and Development Program of China(2017YFD0300905);the Hebei Province Foundation for Returnees(CN201702);the Innovation Capability Upgrading Plan of Hebei Province(18965307H);the Hebei Province Graduate Student Innovation Ability Subsidized Project(CXZZSS2018077);the Drought Meteorological Science Research Foundation Project(IAM201702) |
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| 摘 要： | 探究大气CO_2浓度倍增条件下冬小麦气体交换参数对高温干旱及复水过程的生理响应机制,有助于提高生态过程模型的模拟精度,更加准确地预测全球气候变化对农田生态系统初级生产力及其生态服务功能的影响。利用4个可精准控制CO_2浓度和温度的大型人工气候室,研究了CO_2浓度倍增条件下高温干旱及复水过程对冬小麦气孔特征和气体交换参数的影响。结果表明, CO_2浓度倍增(E)导致冬小麦远轴面气孔密度增加、气孔宽度减小、气孔空间分布规则程度降低,但提高叶片的净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)和水分利用效率(WUE)。高温干旱(HD)使叶片气孔长度、密度、周长和面积减小,导致叶片气体交换参数均显著下降。然而,高CO_2浓度及高温干旱(EHD)导致气体交换参数下降幅度相对较小,表明高CO_2浓度对高温干旱具有一定的缓解作用。此外,干旱复水后,不同处理条件下冬小麦叶片气体交换参数均有所升高,但高温干旱下叶片的气体交换参数仍未能恢复到对照水平,暗示光合器官可能在高温干旱时遭到损伤和破坏。
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| 收稿时间： | 2018-11-04 |
Responses of leaf gas exchange to high temperature and drought combination as well as re-watering of winter wheat under doubling atmospheric CO2 concentration |
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| Li-Li GUO,Xi-Xi ZHANG,Li-Hua HAO,Ya-Jun QIAO,Wen-Na CHEN,Yun-Ze LU,Fei LI,Xu CAO,Qing-Tao WANG,Yun-Pu ZHENG. Responses of leaf gas exchange to high temperature and drought combination as well as re-watering of winter wheat under doubling atmospheric CO2 concentration[J]. Acta Agronomica Sinica, 2019, 45(6): 949-956. DOI: 10.3724/SP.J.1006.2019.81081 |
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| Authors: | Li-Li GUO Xi-Xi ZHANG Li-Hua HAO Ya-Jun QIAO Wen-Na CHEN Yun-Ze LU Fei LI Xu CAO Qing-Tao WANG Yun-Pu ZHENG |
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| Affiliation: | 1.School of Water Conservancy and Hydropower, Hebei University of Engineering, Handan 056038, Hebei, China;2.Ecology and Environment Bureau of Xiong’an New District in Hebei, Xiong’an 071700, Hebei, China;3.School of Landscape and Ecological Engineering, Hebei University of Engineering, Handan 056038, Hebei, China |
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| Abstract: | Understanding the responsible mechanisms of crops to combined environmental stresses such as elevated CO2 concentration, climate warming, and drought is critical to improve the accuracy of ecological process models, and thus accurately predict the impacts of global climate change on the Net Primary Production (NPP) and ecosystem service function of farmlands. Four environmental growth chambers accurately controlling CO2 concentration and temperature were employed to investigate the combined effects of high temperature and drought stresses on the stomatal traits and leaf gas exchange during re-watering under doubling CO2 concentration. We found that elevated CO2 concentration (E) increased the stomatal density, decreased the stomatal width and made the spatial distribution pattern of stomata irregular on the abaxial leaf surface, while enhanced the net photosynthetic rates (Pn), stomatal conductance (Gs), transpiration rates (Tr), and water use efficiency (WUE). The stomatal length, width, perimeter and area were substantially decreased under the combined high temperature and drought stress (HD), resulting in dramatic decline of leaf gas exchange parameters. Doubling CO2 concentration made the leaf gas exchange parameters enhanced under the HD treatment, suggesting that elevated CO2 concentration can compensate the negative impacts of heat and drought on the physiological processes of winter wheat. Additionally, the leaf gas exchange of winter wheat subjected to the high temperature and drought stresses was enhanced after re-watering, but these parameters were still lower than those of Control, suggesting that the photosynthetic apparatus may be damaged by the combined high temperature and drought stresses. |
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| Keywords: | CO2 concentration high temperature and drought re-watering gas exchange parameters stomatal traits |
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