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    潘梦婷, 张德怀, 高娜, 徐铭泽, 李鑫豪, 田赟, 刘鹏, 贾昕, 查天山. 荆条叶片最大水分利用效率的季节变化及其环境调控[J]. 北京林业大学学报, 2023, 45(6): 52-61. DOI: 10.12171/j.1000-1522.20220347
    引用本文: 潘梦婷, 张德怀, 高娜, 徐铭泽, 李鑫豪, 田赟, 刘鹏, 贾昕, 查天山. 荆条叶片最大水分利用效率的季节变化及其环境调控[J]. 北京林业大学学报, 2023, 45(6): 52-61. DOI: 10.12171/j.1000-1522.20220347
    Pan Mengting, Zhang Dehuai, Gao Na, Xu Mingze, Li Xinhao, Tian Yun, Liu Peng, Jia Xin, Zha Tianshan. Dynamics and environmental regulation of the maximum leaf water use efficiency of Vitex negundo var. heterophylla during growing season[J]. Journal of Beijing Forestry University, 2023, 45(6): 52-61. DOI: 10.12171/j.1000-1522.20220347
    Citation: Pan Mengting, Zhang Dehuai, Gao Na, Xu Mingze, Li Xinhao, Tian Yun, Liu Peng, Jia Xin, Zha Tianshan. Dynamics and environmental regulation of the maximum leaf water use efficiency of Vitex negundo var. heterophylla during growing season[J]. Journal of Beijing Forestry University, 2023, 45(6): 52-61. DOI: 10.12171/j.1000-1522.20220347

    荆条叶片最大水分利用效率的季节变化及其环境调控

    Dynamics and environmental regulation of the maximum leaf water use efficiency of Vitex negundo var. heterophylla during growing season

    • 摘要:
        目的  水分利用效率(WUE)作为反映生态系统碳水耦合的重要指标,其与环境因子间的相互关系备受关注,然而对植物潜在水分利用能力对环境变化的适应机制却鲜有报道。本研究以北京油松林下灌木层的优势种荆条为研究对象,旨在探明荆条叶片最大水分利用效率(即水分利用能力潜力,WUEmax)的季节变化特征及其对环境变化的响应机制。
        方法  于2021年6—10月,采用微气象原位观测和LI-6800便携式光合仪人工监测的方法,测定荆条叶片光响应曲线和空气温度(Ta)、土壤含水量(SWC)、空气饱和水汽压差(VPDa)等环境因子。通过瞬时水分利用效率(WUEi)构建了水分利用效率对光响应模型,计算得到荆条叶片WUEmax。并在此基础上进一步分析WUEmax的季节动态变化及其与环境因子间的关系。
        结果  生长季内荆条叶片WUEmax在2.84 ~ 9.17 μmol/mmol的范围内波动,平均值为4.79 μmol/mmol,整体上呈现先下降后平缓的趋势;在湿润条件下荆条WUEmax主要受SWC和Ta的影响。其中,SWC是调控WUEmax的关键环境因子,荆条WUEmax与SWC呈负相关,SWC主要通过气孔导度影响WUEmax;荆条WUEmaxTa呈正相关,Ta主要通过调控光合羧化酶活性影响WUEmax
        结论  本研究初步论证了湿润半湿润环境下荆条主要通过水分资源获得策略来适应环境,且高SWC和低温为荆条叶片WUEmax的抑制因子。

       

      Abstract:
        Objective  Water use efficiency (WUE) is an important indicator of carbon and water coupling in ecosystems, and its relationship with environmental factors has attracted much attention. However, the adaptation mechanism of plant potential water use capacity to environmental change has been rarely reported. This study was to explore the seasonal dynamics of potential leaf water use efficiency and its environmental controls in Vitex negundo var. heterophylla, the dominant shrub species of Pinus tabuliformis in Beijing.
        Method  We measured the photosynthesis and transpiration of photosynthesis-light response curves and calculated corresponding instantaneous water use efficiency (WUEi) from June to October, 2021 using a portable photosynthesis analyzer. In addition, the micrometeorological in situ observation method was used to determine the environmental factors such as air temperature (Ta), soil moisture content (SWC), air vapor pressure deficit (VPDa) and so on. Fitting model of WUEi against light was used to get the maximum water use efficiency (WUEmax). On this basis, the seasonal dynamics of WUEmax and the relationship between WUEmax and environmental factors were analyzed.
        Result  Consequently, the WUEmax descended first and then stayed steady during the growing season, ranging from 2.84 to9.17 μmol/mmol, with a mean of 4.79 μmol/mmol. Seasonal variations in WUEmax were mainly affected by SWC and Ta. Among them, SWC was the key environmental factor regulating WUEmax. WUEmax was negatively correlated with SWC, and SWC was mainly affected WUEmax through leaf stomatal conductance (gc). WUEmax was positively correlated with Ta, and Ta mainly affected WUEmax by regulating photosynthetic carboxylase activity.
        Conclusion  In the humid environment, Vitex negundo var. heterophylla mainly adapts to the environment through the water resource acquisition strategy. High SWC and Ta are inhibitory factors for WUEmax in leaves of Vitex negundo var. heterophylla.

       

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