摘要
木材孔性(无孔材、散孔材、环孔材)体现温带树种木质部解剖结构的进化梯度特征,但木材孔性与树干非结构性碳水化合物(NSC)储存策略的关联机制尚不明确。本研究以河南省宝天曼国家级自然保护区77个树种为对象,其中无孔材3种、散孔材45种、环孔材(含半环孔材)29种,测定胸高位置树皮、边材和心材的可溶性糖、淀粉、总NSC浓度以及糖/淀粉比值,探究暖温带地区树种木材孔性对树干不同组织(树皮、边材和心材)NSC的储存策略的影响。结果表明:树干组织类型和木材孔性对NSC及其组分(可溶性糖和淀粉)浓度具有显著影响,NSC及其组分呈现由外向内径向递减趋势,树皮NSC浓度(6.4%)显著高于边材(3.2%)和心材(2.5%),树干各组织总NSC以可溶性糖为主。3种木材孔性树种树皮的可溶性糖、总NSC和糖/淀粉比值均呈现无孔材>散孔材>环孔材的逆进化梯度模式,而木质部(边材和心材)中NSC存储呈现进化梯度模式。散孔材和环孔材树种NSC及其组分浓度在边材与心材间均呈显著正相关;可溶性糖与淀粉在无孔材、散孔材树种的树皮和环孔材树种的3个树干组织中均呈现显著的正相关关系。沿木材孔性进化梯度,暖温带树木倾向于通过降低树皮至边材的NSC浓度以及增强边材和心材功能分化实现资源优化配置,体现了木质部解剖结构与存储功能的协同。
Wood porosity types(non-porous,diffuse-porous,and ring-porous)reflect evolutionary gradients cha-racteristics of xylem anatomy of temperate tree species.The mechanisms linking porosity type to non-structural carbohydrate(NSC)storage strategy in stem tissues remain unclear.We conducted an experiment with 77 warm-tempe-rate tree species in the Baotianman National Nature Reserve,Henan Province.Among the examined species,there were 3 non-porous wood species,45 diffuse-porous wood species,and 29 ring-porous wood species(including semi-ring-porous wood).We measured soluble sugars,starch,total NSC concentrations and sugars/starch ratio in bark,sapwood,and heartwood at breast height to explore the influence of wood porosity on NSC storage strategy across stem tissues(bark,sapwood and heartwood).The results showed that the types of trunk tissue and wood porosity had significant effects on the concentration of NSC and its components(soluble sugars,and starch).As for the trunk cross-section,NSC and its components exhibited an inward decline trend,with total NSC concentration in bark(6.4%)being notably higher than that in sapwood(3.2%)and heartwood(2.5%).The total NSC in various trunk tissues was dominant in the form of soluble sugars.Across the three wood porosity types,the concentrations of soluble sugars,total NSC,and sugars/starch ratio in tree bark displayed a counter-evolutionary sequence pattern(non-porous>diffuse-porous>ring-porous),while that in sapwood and heartwood increased along the evolutionary gradient.The concentrations of NSC and its components in sapwood and that in heartwood were significantly correlated for both diffuse-porous and ring-porous tree species.Soluble sugars and starch exhibited significant positive correlations in bark of non-porous and diffuse-porous trees and the three trunk tissues of ring-porous tree species.Along the evolutionary gradient of wood porosity,warm-temperate trees tended to optimize resource allocation by reducing the NSC concentration from bark to sapwood and enhancing the functional differentiation between sapwood and heartwood,reflecting the coordination between xylem anatomical structure and storage function.
作者
段一辰
赵化斌
韩永杰
刘晓静
张毅
闫海磊
陈志成
王兴昌
DUAN Yichen;ZHAO Huabin;HAN Yongjie;LIU Xiaojing;ZHANG Yi;YAN Hailei;CHEN Zhicheng;WANG Xingchang(Key Laboratory of Sustainable Forest Ecosystem Management of the Ministry of Education,School of Ecology,Northeast Forestry University,Harbin 150040,China;Baotianman Forest Ecosystem Research Station,Nanyang 474350,Henan,China;Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration,Ecology and Nature Conservation Institute,Chinese Aca-demy of Forestry,Beijing 100091,China)
出处
《应用生态学报》
北大核心
2025年第8期2335-2343,共9页
Chinese Journal of Applied Ecology
基金
十四五国家重点研发计划项目(2021YFD22004,2023YFE0105100-2)
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