降水梯度带共有种银白杨适应策略的区域分异规律  

Regional differentiation of adaptive strategies of common species Populus alba in precipitation gradient zone

作　　者：唐宸宇 张博纳 汤璐瑶 叶琳峰 谢江波 王忠媛 TANG Chenyu;ZHANG Bona;TANG Luyao;YE Linfeng;XIE Jiangbo;WANG Zhongyuan(State Key Laboratory of Subtropical Silviculture,College of Forestry and Biotechnology,Zhejiang A&F University,Hangzhou 311300,China;Yixing Forestry Guidance Station,Yixing,Jiangsu 214206,China)

机构地区：[1]浙江农林大学林业与生物技术学院,省部共建亚热带森林培育国家重点实验室,杭州311300 [2]宜兴市林业指导站,江苏宜兴214206

出　　处：《西北植物学报》2024年第11期1789-1800,共12页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金项目(32371662,42330503,31901280);浙江省科技厅重大科技专项基金项目(2022C02019)。

摘　　要：【目的】揭示共有种银白杨对环境适应策略的区域分异规律,可为气候变化背景下预测植物适应潜力提供数据支持。【方法】沿中国东南至西北降水梯度带选取9处国有林场,测量银白杨水碳相关的18个功能性状,采用性状网络与主成分分析等方法,量化性状的区域分异规律,阐明驱动性状变异的主要气候因子及其生境适应策略。【结果】(1)各性状的变异系数为12.09%~60.35%,其中光合生理及气孔相关性状的变异水平普遍高于其他性状。(2)生长季光合有效辐射、生长季平均气温、年均降水量及干燥度指数对性状变异的影响分别为35.45%、28.37%、19.36%、16.93%,其中生长季光合有效辐射是驱动性状变异最主要的气候因子。(3)性状网络的中心性状为最大净光合速率。【结论】在降水梯度带银白杨适应策略存在差异,由湿润/半湿润区至干旱区,其碳经济策略由相对保守型向获取型转变。[Objective]To reveal the regional variation of adaptation strategies of common species Populus alba,it can provide data support for predicting plant adaptation potential under the background of climate change.[Methods]Nine state-owned forest farms were selected along the precipitation gradient from southeast to northwest China,and 18 functional traits related to water and carbon status of the common species P.alba were measured.The methods of trait network and principal component analysis were used to quantify the regional differentiation of traits,and to clarify the main climatic factors driving the variation of traits and their habitat adaptation strategies.[Results](1)The average coefficient of variation of each trait was 12.09%-60.35%,and the variation level of photosynthetic physiology and stomatal related traits was generally higher than that of other traits.(2)The importance percentage of photosynthetic active radiation,growing season mean temperature,annual mean precipitation,and aridity index on trait variation were 35.45%,28.37%,19.36%,and 16.93%,respectively.Among them,photosynthetic ac-tive radiation in the growing season was the most important climatic factor driving trait variation.(3)The central trait of the trait network was the maximum net photosynthetic rate.[Conclusion]There are differ-ences in the adaptation strategies of P.alba in the precipitation gradient zone.From the humid/semi-hu-mid region to the arid region,the carbon economy strategy changes from a relatively conservative type to an acquisition type.

关 键 词：降水梯度带 银白杨 植物功能性状 适应策略 性状耦合 

分 类 号：Q948.1[生物学—植物学]