格氏栲天然林凋落物浸提液对杉木种子萌发和胚根生长的影响  

Effects of litter extracts from Castanopsis kawakamii natural forest on seed germination and radicle growth of Chinese fir

作　　者：晋梦然 王哲 李梦佳 刘金福[1] 何中声[1] 邢聪 施友文 沈彩霞 Jin Mengran;Wang Zhe;Li Mengjia;Liu Jinfu;He Zhongsheng;Xing Cong;Shi Youwen;Shen Caixia(Key Laboratory of Fujian Universities for Ecology and Resource Statistics,Cross-Strait Nature Reserve Research Center,College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,Fujian,China;Administration Station of Castanopsis kawakamii Nature Reserve in Xinkou of Sanming,Sanming 365000,Fujian,China)

机构地区：[1]福建农林大学林学院,福建农林大学海峡自然保护区研究中心,生态与资源统计福建省高校重点实验室,福建福州350002 [2]三明莘口格氏栲自然保护区管理站,福建三明365000

出　　处：《北京林业大学学报》2020年第4期51-59,共9页Journal of Beijing Forestry University

基　　金：国家自然科学基金项目(31700550、31770678);福建省自然科学基金项目(2019J01367);福建省林业科技推广项目(2018TG14-2);福建省林业科学研究项目(KH1701390)。

摘　　要：【目的】探讨格氏栲天然林凋落物浸提液对伴生种杉木种子萌发与胚根生长的影响,旨在阐明格氏栲自然更新受抑机制问题。【方法】以格氏栲天然林凋落物浸提液为化感物质来源,伴生种杉木种子为受试种子,分析未分解层(枝、叶、皮、壳)、半分解层和全分解层凋落物浸提液对杉木种子发芽率、发芽势、发芽指数及胚根生长的影响。【结果】未分解层凋落物浸提液在低质量浓度时对杉木种子发芽率为促进作用,高质量浓度时为促进或较弱的抑制作用,各质量浓度作用下对发芽势与发芽指数均呈抑制;半分解层与全分解层凋落物浸提液抑制杉木种子萌发,且在低质量浓度(1∶50、1∶100)时抑制作用更强。未分解层凋落物浸提液对杉木胚根生长影响呈"低促高抑"的双重质量浓度效应,高质量浓度时为显著抑制(P<0.05),其中1∶100质量浓度凋落物叶浸提液在作用第18天时,胚根长度较对照组增加14.3%,显著促进作用杉木胚根生长(P<0.05);半分解层各质量浓度浸提液均促进杉木胚根生长,但不显著;全分解层浸提液在1∶5、1∶10和1∶50质量浓度时对杉木胚根生长呈促进作用,1∶30质量浓度时显著抑制(P<0.05)。【结论】格氏栲天然林凋落物低质量浓度浸提液对杉木种子萌发总体呈促进或轻微的抑制作用,对胚根生长为促进作用,即促进了杉木更新,使林内种间竞争加剧,间接导致格氏栲自然更新受抑。[Objective]We tested the effects of litter extracts from Castanopsis kawakamii natural forest on seed germination and radicle growth of coexistence species Chinese fir(Cunninghamia lanceolate),thus to explore the mechanism for the natural regeneration barrier of C.kawakamii species.[Method]The litter extracts of C.kawakamii natural forest were used as the source of allelochemicals,and the seeds of coexistence species C.lanceolate were used as the tested seeds.We analyzed the influence of litter extracts of undecomposed(branches,leaves,bark,and nutshells),semi-decomposed and fully decomposed layer with different concentrations on the germination rate,germination potential,germination index and radicle growth of C.lanceolate seeds.[Result]The undecomposed layer litter extract promoted the germination rate of C.lanceolate at the low concentration,and promoted or weakly inhibited the germination rate at high concentration.The germination potential and germination index were inhibited under each concentration.The litter extracts from semi-decomposed and the fully decomposed layer inhibited the germination index of C.lanceolate seeds,and the inhibition was stronger at the low concentrations(1∶50,1∶100).The effects of undecomposed litter extracts on the radicle growth of C.lanceolate showed a double concentration effect of"low promotion and high inhibition",and significant inhibition at high concentration(P<0.05).At the 18 th day under the leaf extract concentration of 1∶100,the radicle length increased by 14.3%compared with control,which significantly promoted the growth of C.lanceolate’s radicle length(P<0.05).The litter extracts from the semi-decomposed layer promoted the radicle growth of C.lanceolate,but it was not significant.The litter extracts of the fully decomposed layer promoted the growth of C.lanceolate’s radicle length under the concentrations of 1∶5,1∶10 and 1∶50,and the concentration of 1∶30 showed a significant inhibition(P<0.05).[Conclusion]The low concentration litter extracts of the

关 键 词：化感作用 格氏栲 杉木种子 凋落物浸提液 

分 类 号：S792.17[农业科学—林木遗传育种] S722.1+4[农业科学—林学]