摘要
树干是树木非结构性碳水化合物(non-structural carbohydrate,NSC)的重要贮藏器官,树干NSC分布规律可反映碳储存策略及适应性。以科尔沁沙地主要造林针叶树种樟子松(Pinus sylvestris var.mongolica)、赤松(Pinus sylvestris)和油松(Pinus tabuliformis)为研究对象,分析3个树种可溶性糖、淀粉和NSC浓度在树干径向和纵向的空间变化,比较研究树干NSC分布的种间差异。结果表明:在冠中和冠基处,3个树种可溶性糖和NSC浓度随着径向深度增加呈下降趋势;在胸高与根颈处,3个树种随径向深度增加,可溶性糖浓度及糖淀粉比逐渐降低,淀粉浓度逐渐增加,NSC浓度保持平衡。樟子松冠基NSC浓度高于冠中、胸高和根颈,赤松冠中和冠基NSC浓度高于胸高和根颈,油松NSC浓度在不同树干高度间无显著差异。赤松树干NSC浓度高于樟子松和油松。因而,3个针叶树种树干内部是淀粉的重要储存库,有利于适应科尔沁沙地环境。赤松树干碳水化合物储存更多,对不良环境的抗性更强。
Trunk is the main organ for storing non-structural carbohydrate(NSC)in trees.NSC allocation patterns in trunk can reflect carbon storage strategy and adaptability of trees.We measured the concentrations of soluble su-gar,starch and NSC in trunks of three main afforestation conifer species(Pinus sylvestris var.mongolica,P.densiflora,and P.tabuliformis)in Horqin Sandy Land,the radial and vertical variations in trunks,and compared the interspecific variations in allocation patterns.The results showed that,at the middle and base of crown heights of trunks,concentrations of soluble sugar and NSC of the three species decreased with increasing radial depth.At breast and stump heights of trunks,soluble sugar concentrations and the ratios of sugar to starch gradually decreased,starch concentrations gradually increased,and NSC concentrations remained unchanged with increasing radial depth.NSC concentrations were higher at the middle of crown height than at crown base,breast and stump heights of P.sylvestris var.mongolica,while they were higher at the middle and base of crown heights than at breast and stump heights of P.densiflora.There were no differences in NSC concentrations at different heights of trunks of P.tabuliformis.NSC concentrations in trunks of P.densiflora were higher than those of P.sylvestris var.mongolica and P.tabuliformis.Therefore,trunk is important pool for starch reserves for all the three conifer species,which is conducive to adapt to the environment of Horqin Sandy Land.The trunks of P.densiflora stored more carbohydrates,which may facilitate its resistance to adverse environments.
作者
王凯
石亮
WANG Kai;SHI Liang(College of Enwvironmental Sciences and Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China;Qingyuan Forest,National Observation and Research Station,Shenyang 110016,China;Liaoning Institute of Sandy Land Control and Utilization,Fuxin 123000,Liaoning,China;Liaoning Zhanggutai Desert Ecosystem Research Station,Fuxin 123000,Liaoning,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2023年第8期1841-1850,共10页
Chinese Journal of Ecology
基金
国家自然科学基金项目(31400613)
辽宁省兴辽英才计划项目(XLYC1807017)
辽宁省自然科学基金(2022-MS-069)
农业绿色高质量发展专项(2021HQ1913)
国家重点研发计划项目(2017YFD0301704,2016YFD0300307)
公益性行业科研专项(20150312705)资助。
关键词
樟子松
赤松
油松
径向变化
纵向变化
碳储存
种间比较
Pinus sylvestris var.mongolica
Pinus densiflora
Pinus tabuliformis
radial variation
vertical variation
carbohydrate reserve
interspecific comparison