大青山阔叶乔木固碳释氧的光合生理响应机制

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中图分类号：S718.45 文献标识码：A doi：10.13601/j.issn.1005—5215.2026.01.015

AbstractTo clarify the photosynthetic physiological response mechanism of carbon sequestration and oxygen releaseof broad-leavedarbors in Daqing Mountain NatureReserve，Hohhot City，Inner Mongolia，and to provideatheoretical basis forthe protection of ecological resources and carbon sink development in Daqing Mountain，standard sample plots were selected in Daqing Mountain Nature Reserve to measure the basic informationoffive broad-leaved arbor species.A CI-34O portable photosynthesis system was used to determine photosynthesis-related parameters， and net photosynthetic eficiency，wateruse eficiency，and carbon sequestration and Oxygen release capacity were calculated and analyzed.The results showed thatthe photosyntheticrate，transpirationrate，and water useeficiencyof Ulmus pumila，Quercus wutaishansea，and Populus simonii exhibited opposite trends，indicating their poor adaptation to the arid environment of Daqing Mountain.Incontrast，the water useeficiency，daily netphotosynthetic rate， and dailynet transpiration rate of Betula platyphyll and Populus dauidiana showed consistent variation trends. Populus davidiana had the strongest capacity for carbon sequestration and oxygen release，with carbon sequestration and oxygen release amounts reaching 6710.99g⋅m-2⋅d-1 and 4880.72g⋅m-2⋅d-1 ，respectively. However，the carbon sequestration capacity of Populus dauidiana forests was weaker than that of Betula platyphylla forests，which should be related to their lower forest density. Betula platyphylla and Populus davidiana are more adapted to the local environmental conditions，as wellas the increasingly warming and precipitation-decreasing arid siteconditions. Given the excelent carbon sequestration and oxygen release capacity of Betula platyphylla and Populus davidiana， it is recommended to strengthen the tending and management of Populus daoidiana forests to enhancetheir carbon sequestration and oxygen release capacity;in view of the strongest carbon sequestration and oxygen release capacity of Betula platyphylla forests，protection and restoration measures for them should be reinforced.

Key wordsDaqing Mountain;broad-leaved arbors;photosynthetic eficiency;water use eficiency;carbon sequestration and oxygen release amount

在过去的100多年里，全球平均气温上升了约（204 1.1∘C[1] 。（剩余6647字）