CO2浓度和土壤含水量对植物个体尺度短期水分利用效率的影响

doi:10.13287/j.1001-9332.202206.002

应用生态学报 ›› 2022, Vol. 33 ›› Issue (6): 1505-1510.doi: 10.13287/j.1001-9332.202206.002

CO₂浓度和土壤含水量对植物个体尺度短期水分利用效率的影响

张永娥¹, 赵阳¹, 路伟伟², 余新晓^3*, 张晓明¹, 王昭艳¹, 刘冰¹, 辛艳¹

¹中国水利水电科学研究院, 北京 100048;
²中国林业科学研究院, 北京 100091;
³北京林业大学水土保持与荒漠化防治教育部重点实验室, 北京 100083

收稿日期:2021-11-10 接受日期:2022-03-01 发布日期:2022-12-15
通讯作者: *E-mail: yuxinxiao1111@126.com
作者简介:张永娥, 女, 1993年生, 博士研究生。主要从事植物碳水耦合研究。E-mail: zye0516@126.com
基金资助:
国家自然科学基金项目(51979290,51879281,32001372,42107375)、宁夏区水利科技项目(SBZZ-J-2021-13,SBZZ-J-2021-12)和中国水利水电科学研究院科研专项(SE0145B052021)资助。

Effects of CO₂ concentration and soil water content on short-term water-use efficiency at whole-plant level

ZHANG Yong-e¹, ZHAO Yang¹, LU Wei-wei², YU Xin-xiao^3*, ZHANG Xiao-ming¹, WANG Zhao-yan¹, LIU Bing¹, XIN Yan¹

¹China Institute of Water Resources and Hydropower Research, Beijing 100048, China;
²Chinese Academy of Forestry Sciences, Beijing 100091, China;
³Key Laboratory of Soil and Water Conservation and Desertification Control of Ministry of Education, Beijing Forestry University, Beijing 100083, China

Received:2021-11-10 Accepted:2022-03-01 Published:2022-12-15

摘要/Abstract

摘要： 分析植物个体短期水分利用效率(WUE_p)对CO₂浓度(C_a)和土壤含水量(SWC)的响应,可提高对气候变化下个体生存策略的认识。本研究以侧柏幼树为对象,在模拟气候箱中进行培养试验,设400(C₄₀₀)、600(C₆₀₀)和800 μmol·mol^-1CO₂(C₈₀₀)浓度处理和35%～45%田间持水量(FC)、50%～60%FC、60%～70%FC、70%～80%FC、95%～100%FC土壤含水量处理,共15个处理。WUE_p对C_a和SWC的响应用包裹式茎流计、称重法结合静态同化箱测定。结果表明: 个体日间(0.12～1.87 mol·h^-1)和夜间蒸腾速率(0.01～0.16 mol·h^-1)均在C₄₀₀×70%～80%FC时达到最大值,个体日间净光合速率(2.12～22.10 mmol·h^-1)在C₈₀₀×70%～80%FC时达到最大值,而个体夜间呼吸速率(0.84～4.41 mmol·h^-1)随SWC的增加而增加,随C_a的增加而减小,在C₄₀₀×95%～100%FC时达到最大值。WUE_p(5.37～24.35 mmol·mol^-1)在C₈₀₀×50%～60%FC时达到最大值,表明高C_a和干旱条件下,植物个体可通过生理可塑性调整,利用较少的水分固定更多的碳;此外,当个体间形态特征差异较小时,叶片瞬时水分利用效率可以较好地指示WUE_P的变化。

关键词: CO₂浓度, 干旱胁迫, 个体尺度, 短期水分利用效率, 耗水, 固碳

Abstract: Uncovering the variations of short-term water-use efficiency (WUE_p) at whole-plant level in response to CO₂ concentration (C_a) and soil water content (SWC) can improve the understanding of plant survival strategies under climate change. In this study, Platycladus orientalis saplings were cultured in simulated climate chambers.There were totally 15 treatments, including C_a of 400 (C₄₀₀), 600 (C₆₀₀) and 800 (C₈₀₀) μmol·mol^-1 and SWC of 35%-45% field water holding capacity (FC), 50%-60%FC, 60%-70%FC, 70%-80%FC and 95%-100%FC. The WUE_p was measured by mini-lysimeters, weighting method, and static assimilation chamber. The results showed that both daytime (0.12-1.87 mol·h^-1) and nighttime transpiration rates (0.01-0.16 mol·h^-1) at whole-plant level reached the maximum at C₄₀₀×70%-80%FC, while the whole-plant daytime net photosynthetic rate (2.12-22.10 mmol·h^-1) reached the maximum at C₈₀₀×70%-80%FC. In contrast, nighttime respiration rate (0.84-4.41 mmol·h^-1) increased with increasing SWC, but decreased with increasing of C_a, reaching the maximum at C₄₀₀×95%-100%FC. For WUE_p (5.37-24.35 mmol·mol^-1), it reached the maximum at C₈₀₀×50%-60%FC, indicating that plants could use less water and fixed more carbon by adjusting adaptation strategies under high C_a and drought conditions. In addition, leaf instantaneous water-use efficiency was a good predictor of WUE_P when the canopy structure was similar.

Key words: CO₂ concentration, drought stress, whole-plant level, short-term water-use efficiency, water consumption, carbon sequestration

张永娥, 赵阳, 路伟伟, 余新晓, 张晓明, 王昭艳, 刘冰, 辛艳. CO₂浓度和土壤含水量对植物个体尺度短期水分利用效率的影响[J]. 应用生态学报, 2022, 33(6): 1505-1510.

ZHANG Yong-e, ZHAO Yang, LU Wei-wei, YU Xin-xiao, ZHANG Xiao-ming, WANG Zhao-yan, LIU Bing, XIN Yan. Effects of CO₂ concentration and soil water content on short-term water-use efficiency at whole-plant level[J]. Chinese Journal of Applied Ecology, 2022, 33(6): 1505-1510.

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CO₂浓度和土壤含水量对植物个体尺度短期水分利用效率的影响

Effects of CO₂ concentration and soil water content on short-term water-use efficiency at whole-plant level

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