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

• 研究论文 • 上一篇    下一篇

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. 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-xiao3*, ZHANG Xiao-ming1, WANG Zhao-yan1, LIU Bing1, XIN Yan1   

  1. 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: 分析植物个体短期水分利用效率(WUEp)对CO2浓度(Ca)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。WUEpCa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Ca的增加而减小,在C400×95%~100%FC时达到最大值。WUEp(5.37~24.35 mmol·mol-1)在C800×50%~60%FC时达到最大值,表明高Ca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WUEP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 (WUEp) at whole-plant level in response to CO2 concentration (Ca) 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 Ca 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 WUEp 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 Ca, reaching the maximum at C400×95%-100%FC. For WUEp (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 Ca and drought conditions. In addition, leaf instantaneous water-use efficiency was a good predictor of WUEP when the canopy structure was similar.

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