增温对亚热带杉木光合作用与气孔特征及抗氧化系统的影响  

Effects of Warming on Photosynthesis,Stomatal Traits,and Antioxidant Systems of Subtropical Cunninghamia lanceolata

作　　者：谭艺桦 韩润宇 熊德成[1,2,3] 刘小飞 胥超[2,3] 陈仕东 TAN Yihua;HAN Runyu;XIONG Decheng;LIU Xiaofei;XU Chao;CHEN Shidong(Institute of Geography,School of Carbon Neutrality Future Technology,Fujian Normal University,Fuzhou 350117,China;School of Geographical Sciences,School of Carbon Neutrality Future Technology,Fujian Normal University,Fuzhou 350117,China;Sanming Forest Ecosystem National Observation and Research Station,Sanming 365000,Fujian,China)

机构地区：[1]福建师范大学地理研究所,福州350117 [2]福建师范大学地理科学学院、碳中和未来技术学院,福州350117 [3]福建三明森林生态系统国家野外科学观测研究站,福建三明365000

出　　处：《亚热带资源与环境学报》2025年第1期156-163,共8页Journal of Subtropical Resources and Environment

基　　金：福建省科技厅公益类项目(2022R1002004);国家自然科学基金项目(31930071,32192433)。

摘　　要：植物光合作用与气孔特征及抗氧化系统密切相关,但在增温条件下3者之间的响应和内在关联机制尚未明确。增温可能改变气孔特征和抗氧化系统,进而影响植物不同季节的光合作用与生产力。以亚热带重要人工林树种杉木(Cunninghamia lanceolata)为研究对象,进行中宇宙土壤增温实验,并在夏、冬季取样,探讨增温对气孔特征、抗氧化系统及光合作用的影响。结果表明,夏季增温显著降低了杉木蒸腾速率(Tr)(P<0.05)、气孔导度(g_(s))与胞间CO_(2)浓度(C_(i))(P<0.01),同时显著提高了可溶性糖(SS)含量(P<0.05)和抗坏血酸氧化酶(APX)的活性(P<0.01)。冬季,增温显著提高了杉木的净光合速率P_(n)(P<0.01)、水分利用效率(WUE)(P<0.05)、SS含量(P<0.05)、APX(P<0.01)和过氧化物酶(POD)(P<0.05)活性,同时显著减少了C_(i)(P<0.05)、丙二醛(MDA)(P<0.05)、可溶性蛋白(SP)(P<0.01)、脯氨酸(Pro)(P<0.05)含量和超氧化物歧化酶SOD活性(P<0.05)。增温导致杉木针叶气孔孔径缩小,气孔密度增加,这种小而密集的气孔组合可能有利于提高WUE,以应对水分胁迫。杉木在夏季和冬季采取了不同的策略来缓解增温引起的氧化损伤,以维持细胞正常功能。本研究可为深入理解全球变暖背景下亚热带人工林生产力的响应机制提供科学依据。Stomatal traits and antioxidant systems are closely associated with plant photosynthesis,yet their responses and underlying mechanisms under warming remain unclear.Warming-induced changes in these systems may impact seasonal photosynthesis and productivity of plant.A mesocosm soil warming experiment was conducted with Cunninghamia lanceolata,a major subtropical plantation tree species,with samples collected in summer and winter.Results showed that in summer,warming significantly reduced transpiration rate(T_(r))(P<0.05),stomatal conductance(g_(s)),and intercellular carbon dioxide concentration(C_(i))(P<0.01)of C.lanceolata,while increased soluble sugars(SS)content(P<0.05)and ascorbate oxidase(APX)activity(P<0.01).In winter,warming significantly increased net photosynthetic rate P_(n)(P<0.01),water use efficiency(WUE)(P<0.05),SS content(P<0.05),APX(P<0.01),and peroxidase(POD),while reduced the content of C i(P<0.05),malondialdehyde(MDA)(P<0.05),soluble protein(SP)(P<0.01),proline(Pro)(P<0.05),and superoxide dismutase(SOD)activity(P<0.05).Warming reduced stomatal aperture and increased stomatal density in C.lanceolata needles,potentially enhancing WUE and water stress tolerance.Cunninghamia lanceolata exhibited seasonal variations in strategies to mitigate warming-induced oxidative damage and sustain cellular function.This study enhances the understanding of how global warming affects productivity in subtropical plantations.

关 键 词：土壤增温 光合作用 气孔特征 抗氧化系统 季节变化 

分 类 号：Q948.1[生物学—植物学]