| 摘要: |
| 本研究以黄河三角洲滨海湿地优势物种芦苇（Phragmites australis）为对象,利用开顶箱（OTC）进行模拟增温,采用新一代光合测量仪（Li-6800）,系统分析了气温升高对芦苇光合生理特征的季节性影响。结果表明,增温对芦苇光合生理的影响呈现明显的阶段性变化特征:生长初期（5月和6月）增温使得表观量子效率（AQY）和初始羧化效率（φ）显著提高25.0%和71.4%,显著增强了净光合速率（Pn）,其最大净光合速率(Pnmax)也提高了21.3%;中期（7月）增温使最大净光合速率显著上升77.3%,水分利用效率（WUE）也显著提升,芦苇对增温产生适应性调节;生长后期（8月）,光合机构已处于高温胁迫状态,光能分配失衡;至9月,增温在一定程度上延缓功能衰退(Pnmax上升4.5%),光合限制转为非气孔因素主导。研究揭示增温对芦苇光合特性影响是一个动态、多参数协同的适应过程,其长期“蓝碳”功能取决于各生长阶段促进与抑制效应的综合平衡。 |
| 关键词: 全球变暖 瞬时气体交换 光响应曲线 CO2响应曲线 蓝碳 |
| DOI：10.11759/hykx20251010001 |
| 分类号:Q945 |
| 基金项目:海洋负排放国际大科学计划(66.8号行动);国家自然科学基金区域发展联合基金重点项目(U22A20558);山东省自然科学基金(ZR2023MD060,ZR2022MD024);中国地质调查局项目(DD20189503,DD20221775) |
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| Effects of simulated warming on photosynthetic characteristics of Phragmites australis in the Yellow River Delta wetland |
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ZHANG Yuhua1,2, XIE Liujuan2, YE Siyuan1,2, HE Lei2, DING Xigui2, SU Dapeng2, WU Xiong1
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1.School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China;2.Key Laboratory of Coastal Wetlands Biogeosciences, CGS, Northern Observation and Research Station of Coastal Salt Marshes, MNR, Qingdao Institute of Marine Geology, Qingdao 266237, China
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| Abstract: |
| In this study, Phragmites australis, the dominant species in the coastal wetland of the Yellow River Delta, was used as the study object. An open-top chamber（OTC） was used to simulate warming, and a new-generation photosynthetic measuring instrument（LI-6800） was employed to systematically analyze the seasonal effects of elevated temperature on the photosynthetic physiological characteristics of P. australis. The results showed that the effects of warming on the photosynthetic physiology of P. australis exhibited obvious periodic changes. In the early growth stage（May and June）, warming significantly increased the apparent quantum yield（AQY） and initial carboxylation efficiency（φ） by 25.0% and 71.4%, respectively, significantly enhanced the net photosynthetic rate（Pn）, and increased the maximum net photosynthetic rate(Pnmax) by 21.3%. In the middle growth stage（July）, warming significantly increased the maximum net photosynthetic rate by 77.3%, and water use efficiency（WUE） also increased significantly, indicating that P. australis exhibited adaptive adjustment to warming. In the late growth stage（August）, the photosynthetic apparatus was under high-temperature stress, and light energy distribution became unbalanced. By September, warming delayed the functional decline to some extent(Pnmax increased by 4.5%), and photosynthetic limitation shifted to non-stomatal factors. This study revealed that the response of P. australis to warming is a dynamic process involving multi-parameter synergistic adaptation, and its long-term “blue carbon” function depends on the comprehensive balance between promotion and inhibition effects at different growth stages. |
| Key words: global warming instantaneous gas exchange light response curve CO2 response curve blue carbon |
