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作 者:韩丽冬 刁云飞 张苏 沃晓棠 HAN Lidong;DIAO Yunfei;ZHANG Su;WO Xiaotang(Heilongjiang Ecology Institute,Harbin 150081,China)
出 处:《森林工程》2025年第2期312-320,共9页Forest Engineering
基 金:黑龙江省自然科学基金项目(LH2021C093);黑龙江省省属科研院所科研业务费项目(SCZ2022-06,CZKYF2023-1-B028,CZKYF2024-1-B014)。
摘 要:为探究东北红豆杉对全球变暖的适应对策,基于稳定同位素技术,以不同生长阶段东北红豆杉(幼苗、幼树、成树)为研究对象,分析其叶片稳定碳同位素组成(δ^(13)C)、水分利用效率(water use efficiency,WUE)的季节动态及影响因子。结果表明,不同生长阶段东北红豆杉叶片δ^(13)C值变化范围为-3.051%~-2.939%,平均值为-2.981%±0.061%;WUE变化范围为58.96~71.68μmol/mol,平均值为66.87μmol/mol±6.90μmol/mol。东北红豆杉δ^(13)C值和WUE随季节变化由大到小排序为生长季前期(6月)、生长季中期(8月)、生长季后期(9月),不同生长阶段由大到小为成树、幼树、幼苗。不同生长阶段东北红豆杉WUE均与10 cm土壤含水量呈显著线性负相关(幼苗,y=-0.82x+107.29,R^(2)=0.80,P<0.01;幼树,y=-0.34x+84.17,R^(2)=0.45,P<0.05;成树,y=-0.93x+101.32,R^(2)=0.44,P<0.05),土壤含水量是东北红豆杉WUE的主控因子。不同生长阶段东北红豆杉根据植株个体水分需求及受外界水热因子影响程度选择不同的水分利用策略。In order to explore the adaptation strategies of Taxus cuspidata to global warming,the seasonal dynamics and influencing factors of stable carbon isotope composition(δ^(13)C)and water use efficiency(WUE)of Taxus cuspidata(seedling,sapling,mature tree)at different growth stages were analyzed based on stable isotope technique.The results showed that theδ^(13)C values of Taxus cuspi⁃data leaves at different growth stages ranged from-3.051%to-2.939%,with an average value of-2.981%±0.061%.WUE ranged from 58.96 to 71.68μmol/mol,with an average of 66.87μmol/mol±6.90μmol/mol.Theδ^(13)C and WUE of Taxus cuspidata showed a decreasing trend of early growing season(June)>middle growing season(August)>late growing season(September),and the mature tree>sapling>seedling,at different growth stages.There was a significant linear negative correlation between WUE and 10 cm soil water content in different growth stages of Taxus cuspidata(seedling,y=-0.82x+107.29,R^(2)=0.80,P<0.01;sapling,y=-0.34x+84.17,R^(2)=0.45,P<0.05;mature tree,y=-0.93x+101.32,R^(2)=0.44,P<0.05).Soil water content was the main controlling factor of WUE of Taxus cuspidata.Taxus cuspidata in different growth stages selected different water use strategies according to individual water demand and the degree of influence by external water and heat factors.
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