中南林业科技大学学报

水分胁迫及恢复对白兰幼树叶片光合生理特性的影响

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周鹏 ¹ , 田洋 ² , 李智琦 ¹ , 齐跃强 ¹

中南林业科技大学学报 | 林学 2026,46(5): 29-38

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中南林业科技大学学报 |林学 2026 , 46 (5) : 29 -38

水分胁迫及恢复对白兰幼树叶片光合生理特性的影响

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周鹏¹, 田洋², 李智琦¹, 齐跃强¹

作者信息

^1.广州市林业和园林科学研究院　广东广州城市生态系统国家定位观测研究站，广东　广州　510405

^2.广东省林业调查规划院，广东　广州　510520

通讯作者:

李智琦（2278554670@qq.com），高级工程师，博士。

作者简介:

周鹏（173770894@qq.com），博士。

Effects of water stress and recovery on the physiological and ecological characteristics of Michelia × alba sapling

Peng ZHOU¹, Yang TIAN², Zhiqi LI¹, Yueqiang QI¹

Affiliations

^1.Guangzhou Institute of Forestry and Landscape Architecture, Guangzhou Urban Ecosystem National Field Station, Guangzhou 510405, Guangdong, China

^2.Guangdong Forestry Survey and Planning Institute, Guangzhou 510520, Guangdong, China

出版时间: 2026-05-25 doi: 10.14067/j.cnki.1673-923x.2026.05.004

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摘要

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【目的】

探究水分胁迫及水分恢复对南亚热带常用园林绿化树种白兰Michelia × alba幼树叶片水势、光合和叶绿素荧光等光合生理特性的影响。

【方法】

采用12个隔离地下水的开顶箱（OTC），每个OTC种植1株白兰幼树，按照随机区组试验设计，利用树下截雨和人工浇水相结合的方式共设置4种水分梯度处理，分别为过量水组（OW）、对照组（CK）、中度干旱组（MD）和重度干旱组（HD），测定水分胁迫（持续3个月）后不同时间及水分恢复（持续2个月）后不同时间白兰幼树叶片水势、瞬时光合、叶绿素荧光等参数动态变化，对比分析不同处理间的差异。

【结果】

1）与CK比较，干旱胁迫（MD和HD）显著降低白兰幼树叶片水势指标（正午水势）、光合指标（净光合速率和气孔导度等）和叶绿素荧光指标（最大光化学效率和电子传递速率等），而过量水灌溉对白兰幼树叶片水势、光合和荧光指标均不存在显著影响。2）在经历连续大气自然降水后，干旱胁迫（MD和HD）下白兰幼树叶片水势、光合和叶绿素荧光指标均恢复，与CK不存在显著差异。3）土壤水分恢复后，各处理组间的水势、光合和荧光指标均不存在显著差异。

【结论】

1）干旱胁迫会显著降低白兰幼树叶片水势、光合和荧光参数，使叶片出现萎蔫现象，影响白兰幼树的正常生长，及时补水可促使白兰幼树恢复正常生长状态。具体来说，当土壤水分低于25%田间持水量时，及时通过人工浇水措施补充土壤水分。2）大气降水可有效缓解土壤干旱对白兰幼树叶片水势、光合和荧光的抑制，促进白兰幼树的生长恢复。在城市园林绿化植物的养护与管理过程中，当出现持续干旱时，应关注土壤水分指标，及时补水可使白兰幼树从水分胁迫中恢复，避免死亡。

关键词

白兰幼树 / 水分胁迫 / 水分恢复 / 光合特性 / 叶绿素荧光

Abstract

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【Objective】

To investigate the effects of water stress and subsequent recovery on the water potential, photosynthetic and chlorophyll fluorescence characteristics of Michelia × alba sapling, a widely utilized greening tree species in the south subtropical region.

【Method】

Twelve open-topped chambers (OTCs) with isolated groundwater were utilized, each containing one Michelia × alba sapling. A randomized block design was employed to set up four water gradient treatments, incorporating both rainfall interception in the undercanopy and artificial irrigation: Over-irrigation (OW), control (CK), moderate drought (MD), and high drought (HD). The dynamic changes in instantaneous water potential, photosynthesis and chlorophyll fluorescence parameters of the Michelia × alba leaves were measured under different water stress treatments (3 consecutive months) and subsequent water recovery (2 consecutive months), and the differences between treatments were analyzed.

【Result】

Compared with CK, drought stress (MD and HD) significantly reduced the leaf water potential index (midday water potential), photosynthetic indices (net photosynthetic rate, stomatal conductance, etc.), and chlorophyll fluorescence indices (maximum photochemical efficiency, electron transport rate, etc.) of Michelia × alba saplings. In contrast, excessive water irrigation had no significant effect on the leaf water potential, photosynthesis, and fluorescence indices of Michelia × alba saplings. After continuous natural atmospheric precipitation, the leaf water potential, photosynthesis, and chlorophyll fluorescence indices of Michelia × alba saplings under drought stress (MD and HD) recovered and showed no significant differences compared with those of the CK. After the soil moisture was restored, there were no significant differences in the water potential, photosynthesis, and fluorescence indices among different treatment groups.

【Conclusion】

Drought stress limits the leaf water potential, photosynthesis, and fluorescence of Michelia × alba sapling leaves, causing wilting and negatively affecting growth. Timely watering can restore the plants to normal conditions. Specifically, before the soil moisture falls below 25% of the field capacity, timely artificial watering should be applied to replenish the soil moisture. Atmospheric precipitation effectively mitigates the suppression of Michelia × alba sapling's water potential, photosynthetic fluorescence due to soil drought, promoting recovery and growth. In the maintenance and management process of urban landscaping plants like Michelia × alba, when continuous drought occurs, attention should be paid to the soil moisture index. Timely watering can help Michelia × alba recover from water stress and avoid death.

Key words

Michelia × alba sapling / water stress / water recovery / photosynthetic characteristics / chlorophyll fluorescence

引用本文

周鹏, 田洋, 李智琦, 齐跃强. 水分胁迫及恢复对白兰幼树叶片光合生理特性的影响. 中南林业科技大学学报, 2026 , 46 (5) : 29 -38 . DOI: 10.14067/j.cnki.1673-923x.2026.05.004

Peng ZHOU, Yang TIAN, Zhiqi LI, Yueqiang QI. Effects of water stress and recovery on the physiological and ecological characteristics of Michelia × alba sapling[J]. Journal of Central South University of Forestry & Technology, 2026 , 46 (5) : 29 -38 . DOI: 10.14067/j.cnki.1673-923x.2026.05.004

基金

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国家重点研发计划项目(2022YFC3802602)
广州市科学技术局农业和社会发展科技项目(202206010058)

参考文献

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2026年第46卷第5期

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doi: 10.14067/j.cnki.1673-923x.2026.05.004

接收时间：2025-05-06
首发时间：2026-10-30
出版时间：2026-05-25

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作者

出版历史

收稿日期：2025-05-06
修回日期：2025-07-08

基金

国家重点研发计划项目(2022YFC3802602)

广州市科学技术局农业和社会发展科技项目(202206010058)

作者信息

^1.广州市林业和园林科学研究院　广东广州城市生态系统国家定位观测研究站，广东　广州　510405

^2.广东省林业调查规划院，广东　广州　510520

通讯作者:

李智琦（2278554670@qq.com），高级工程师，博士。

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2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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