致死性干旱对8种树种幼苗非结构性碳水化合物的影响  

The Effects of Lethal Drought on Non-structural Carbohydrates in Seedlings of 8 Tree Species

作　　者：赵楠 廖迎春[1] 黄国敏[1] 刘文飞[1] 沈芳芳[1] 段洪浪[1] ZHAO Nan;LIAO Yingchun;HUANG Guomin;LIU Wenfei;SHEN Fangfang;DUAN Honglang(Nanchang Institute of Technology/Jiangxi Key Laboratory for Restoration of Degraded Ecosystems&Watershed Ecohydrology Nanchang,Jiangxi 330099)

机构地区：[1]南昌工程学院江西省退化生态系统修复与流域生态水文重点实验室,南昌330099

出　　处：《热带生物学报》2021年第3期289-295,共7页Journal of Tropical Biology

基　　金：国家自然科学基金项目(31760111);江西省杰出青年基金项目(20192BCBL23016)。

摘　　要：未来极端干旱的强度与频率将增加,势必影响树木的生长与生存。然而,非结构性碳水化合物(nonstructural carbohydrate,NSC)的含量变化对树木死亡的贡献尚不清楚。本研究以亚热带地区常见落叶树种(无患子、枫香)和常绿树种(深山含笑、苦槠、木荷、青冈栎、杜英、樟树)为研究对象,设置对照(CK)和致死性干旱(D)两个处理,研究干旱死亡时各树种的非结构性碳水化合物[包括可溶性糖(soluble sugars,SS)和淀粉(starch,ST)]含量差异。结果显示:致死性干旱胁迫下,深山含笑、苦槠、杜英及樟树的叶、茎、根的可溶性糖的含量下降;枫香、深山含笑、苦槠及青冈栎的叶、茎、根的淀粉含量下降;深山含笑、苦槠、青冈栎、杜英及樟树的叶、茎、根的非结构性碳水化合物含量下降。而无患子的叶、茎、根与木荷的叶、根却显示非结构性碳水化合物积累。本研究结果表明,大部分受试树种在干旱死亡过程中可能受到一定程度"碳饥饿"威胁,但存在树种与器官间的差异。另外,落叶树种与常绿树种之间的非结构性碳水化合物干旱响应差异不明显。Tree growth and survival will be affected by the high frequency and severity of extreme drought in the future due to climate change.However,the role of non-structural carbohydrates(NSC)in tree mortality is still unclear.Seedlings of 2 common deciduous tree species(Sapindus mukurossi,Liquidambar formosana)and 6 evergreen tree species(Michelia maudiae,Castanopsis sclerophylla,Schima superba,Cyclobalanopsis glauca,Elaeocarpus decipiens,Cinnamomum camphora)in the subtropical region of China were planted under well-watered(CK)and drought(D)treatments to analyze the difference in NSC(including soluble sugars(SS)and starch(ST))during the tree mortality among the 8 tree species.The result shows that lethal drought reduced the SS content in the roots,stems and leaves of M.maudiae,C.sclerophylla,E.decipiens and C.camphora,the ST content in the roots,stems and leaves of L.formosana,M.maudiae,C.sclerophylla,and C.glauca,and the NSC content in the roots,stems and leaves of M.maudiae,C.sclerophylla,C.glauca,E.decipiens and C.camphora.However,NSC was accumulated in S.mukurossi(roots,stems,and leaves)and S.superba(leaves and roots).All Tthese results suggest that most of the species might experience the threat of carbon starvation during the process of drought-induced mortality depending on species and organs.Moreover,drought responses of NSC did not differ significantly between the deciduous and evergreen species.These findings can provide a reference for research of impacts of global climate change on tree eco-physiology and for the management of subtropical forests.

关 键 词：极端干旱 可溶性糖 淀粉 非结构性碳水化合物 碳饥饿 

分 类 号：Q945.78[生物学—植物学]