摘要
以科尔沁沙地引进树种银中杨(Populus alba×P.berolinensis)与乡土树种白榆(Ulmus pumila)为研究对象,分析2树种不同器官(叶片、枝条和根系)中非结构性碳水化合物(NSC)的季节动态及凋落叶中NSC含量,比较不同树种的碳分配与储存策略。结果表明:随着季节变化,银中杨叶片可溶性糖和NSC含量先下降后增加,淀粉含量逐渐下降;枝条和根系可溶性糖含量及可溶性糖/淀粉先上升后下降,而淀粉含量先下降后上升;从春季到秋季,白榆枝条NSC含量变化不显著,根系可溶性糖、淀粉及NSC含量先下降后上升;银中杨春季和夏季叶片可溶性糖含量高于白榆,除秋季枝条外,白榆各器官淀粉含量高于银中杨,可溶性糖/淀粉低于银中杨,白榆凋落叶可溶性糖、淀粉和NSC含量高于银中杨;银中杨NSC主要用于生长消耗,群落中的竞争性更强;白榆NSC更多以淀粉形式储存,抗逆性更强,有利于植物⁃土壤间的碳循环。
We analyzed seasonal changes of non⁃structural carbohydrate(NSC)contents in different organs(leaf,branch and root)and leaf litter of an introduced species Populus alba×P.berolinensis and a native species Ulmus pumila in Horqin Sandy Land.Carbon allocation and storage strategies of those two species were compared.Results showed that for P.alba×P.berolinensis,contents of soluble sugar and NSC decreased and then increased while starch content gradually decreased in leaves over season;soluble sugar content and ratio of soluble sugar to starch increased and then dropped,starch content decreased and subsequently rose in branches and roots over season.In contrast,for U.pumila,NSC content in branches remained unchanged while contents of soluble sugar,starch and NSC in roots firstly decreased and then increased from spring to autumn.Soluble sugar contents in leaves of P.alba×P.berolinensis were higher than those of U.pumila in spring and summer.Except for branches in autumn,starch contents in all organs of U.pumila were higher than that of P.alba×P.berolinensis,and the ratio of soluble sugar to starch was lower than that in P.alba×P.berolinensis.Contents of soluble sugar,starch,and NSC in leaf litters of U.pumila were higher than those of P.alba×P.berolinensis.Therefore,NSC is mainly used for growth and con⁃sumption,implying stronger competition for P.alba×P.berolinensis in the community.NSC is more stored as starch,which may contribute to the stronger stress resistance of U.pumila and facilitate the carbon cycle between plant and soil.
作者
王凯
王欣
张日升
刘畅
WANG Kai;WANG Xin;ZHANG Risheng;LIU Chang(College of Environmental Science 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
2024年第12期3624-3631,共8页
Chinese Journal of Ecology
基金
国家自然科学基金项目(31400613)
辽宁省教育厅重点攻关项目(LJKZZ20220050)资助。
关键词
防护林衰退
碳分配
引进树种
乡土树种
适应策略
适地适树
shelterbelt decline
carbon allocation
introduced tree species
native tree species
adaptive strategy
matching site with tree species
