林窗凋落物化感作用对格氏栲幼苗生长的影响  

Allelopathic effect of forest gap litter on the growth of Castanopsis kawakamii seedlings

作　　者：晋梦然 贾梅花 肖倩茹 刘金福[1,2,3] 沈彩霞 施友文 何中声 JIN Mengran;JIA Meihua;XIAO Qianru;LIU Jinfu;SHEN Caixia;SHI Youwen;HE Zhongsheng(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,China;Cross-Strait Nature Reserve Center,Fujian Agriculture and Forestry University,Fuzhou 350002,China;Key Laboratory of Fujian Universities for Ecology and Resource Statistics,Fuzhou 350002,China;Service Station of Castanopsis kawakamii Nature Reserve in Xinkou,Sanming of Fujian Province,Sanming 365000,China;Fujian Forestry Investigation and Planning Institute,Fuzhou 350003,China)

机构地区：[1]福建农林大学林学院,福州350002 [2]福建农林大学海峡自然保护区研究中心,福州350002 [3]生态与资源统计福建省高校重点实验室,福州350002 [4]福建省三明莘口格氏栲自然保护区服务站,三明365000 [5]福建省林业调查规划院,福州350003

出　　处：《生态学报》2022年第20期8288-8299,共12页Acta Ecologica Sinica

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

摘　　要：为探讨林窗凋落物化感作用对幼苗更新的影响,通过模拟林窗与非林窗光照强度,以林窗和非林窗凋落物水浸提液(浓度1∶10、1∶30、1∶50和1∶100)为化感物质的主要来源,阐述林窗、凋落物化感作用及二者协同效应对格氏栲幼苗高度、叶绿素荧光参数和渗透调节物质的影响。结果表明:(1)非林窗幼苗的叶绿素相对含量、PSⅡ潜在活力(F_(v)/F_(o))、PSⅡ最大光化学效率(F_(v)/F_(m))和可溶性糖含量高于其它林窗,后期幼苗高度和叶片初始荧光(F_(o))低于其它林窗。(2)与对照处理相比,不同浓度凋落物浸提液均抑制了幼苗F_(v)/F_(o),而浓度1∶50和1∶100提高了幼苗后期高度、可溶性蛋白含量和叶绿素相对含量。(3)不同浓度凋落物浸提液中,林窗存在总体上提高了幼苗高度,且小林窗和非林窗幼苗叶绿素相对含量、F_(v)/F_(o)和F_(v)/F_(m)值高于其它林窗。(4)熵值法结果表明,非林窗格氏栲幼苗生长的综合评价值高于其它林窗,凋落物浸提液浓度对幼苗生长的影响呈“低促高抑”效应,浓度1∶50下幼苗生长的综合评价值高于其它浓度。高浓度(1∶10和1∶30)浸提液下,中林窗幼苗生长的综合评价值高于其它林窗。综上,林窗与凋落物化感作用共同影响格氏栲幼苗,且中林窗(50—100 m^(2))减弱了高浓度凋落物化感作用对格氏栲幼苗生长的毒害作用。未来,通过人为干扰方式调节林窗面积,适当清理森林凋落物以促进格氏栲幼苗天然更新。In order to explore the allelopathy effect of forest gap litter on the natural regeneration of Castanopsis kawakamii seedlings,we illustrated forest gap,litter allelopathy effect,and their interactions on the seedling height,chlorophyll fluorescence parameters,and osmotic adjustment substance of C.kawakamii.In this experiment,we simulated the light intensity of different gaps and non-gaps,and used aqueous extracts of litter as the main allelochemicals with different concentrations′treatments(1∶10,1∶30,1∶50 and 1∶100).The results showed that:(1)the relative chlorophyll content,PSⅡpotential activity(F_(v)/F_(o)),PSⅡmaximal photochemical efficiency(F_(v)/F_(m)),and the soluble sugar content of seedlings in non-gaps were higher than those of other gaps,whereas the seedlings height on the late stage and initial fluorescence(F_(o))were lower than those of other gaps.(2)Comparing with the control treatment,the litter extracts with different concentrations decreased the F_(v)/F_(o) value,while the concentrations of 1∶50 and 1∶100 increased seedling height in the late stage,the soluble protein content and relative chlorophyll content.(3)The formation of forest gap improved seedling height under the different concentrations of litter extract in general.In addition,the relative chlorophyll content,F_(v)/F_(o),and F_(v)/F_(m) under different concentrations in small gaps and non-gaps were generally higher than those in other gaps.(4)The results of entropy method indicated that the comprehensive evaluation value of C.kawakamii seedling in non-gaps was higher than that of other gaps.The influences of litter extract concentration on seedlings growth expressed an obvious trend with“low promotion and high inhibition”,and the comprehensive evaluation value of 1∶50 concentration was higher than that of other concentrations.Under the higher concentrations(1∶10 and 1∶30),the comprehensive evaluation value in medium gaps was higher than that of other gaps.It concluded that forest gap and litter allelopathic

关 键 词：格氏栲 林窗 凋落物化感作用 幼苗生长 

分 类 号：S792.17[农业科学—林木遗传育种]