土壤石砾含量对掌叶木幼苗生长及生理影响的年际变化  

Interannual Changes in the Effects of Soil Gravel Content on the Growth and Physiology of Handeliodendron bodinieri Seedlings

作　　者：马朝阳 刘天凤 李晓雪 霍灿灿 付玲玲 李在留[1,2,3] MA Chaoyang;LIU Tianfeng;LI Xiaoxue;HUO Cancan;FU Lingling;LI Zailiu(Guangxi University,College of Forestry,Nanning 530004;Key Laboratory of National Forestry and Grassland Administration on Cultiva-tion of Fast-Growing Timber in Central South China,Nanning 530004;Guangxi Key Laboratory of Forest Ecology and Conservation,Nanning 530004)

机构地区：[1]广西大学林学院,南宁530004 [2]国家林草局中南速生材繁育重点实验室点实验室,南宁530004 [3]广西森林生态与保育重点实验室,南宁530004

出　　处：《植物研究》2023年第6期890-899,共10页Bulletin of Botanical Research

基　　金：广西林业科技推广示范项目(桂林科字[2022]第24号);国家自然科学基金项目(31560200,31060053);广西大学“大学生创新创业训练计划”项目(S202210593343)。

摘　　要：掌叶木(Handeliodendron bodinieri)是我国西南喀斯特地区特有濒危物种,为探究土壤石砾含量对不同生长季掌叶木幼苗生长及生理特性的影响,以1年生掌叶木实生苗为试验材料,设置不同土壤石砾含量(0<ck>、20%、40%、60%、80%),开展盆栽试验,测定3个连续生长季内各组幼苗生长、光合及抗性生理指标,并进行综合评价。结果表明:在第1个生长季,当土壤石砾含量为60%时,幼苗净光合速率显著高于对照组;当土壤石砾含量为40%时,幼苗地径增长率、叶生物量、蒸腾速率、气孔导度、可溶性蛋白质量分数及超氧化物歧化酶(SOD)活性显著高于对照组;幼苗胞间CO_(2)摩尔分数和可溶性糖质量分数在石砾含量大于20%时显著高于对照组;株高增长率、叶面积及根、茎、总生物量与对照组差异不显著。在第2个生长季,当土壤石砾含量为60%时,掌叶木幼苗蒸腾速率及可溶性蛋白质量分数显著高于对照组;当土壤石砾含量为40%时,幼苗SOD活性显著高于对照组,茎生物量在土壤石砾含量为20%时显著高于对照组,其余指标与第1生长季趋势相似。在第3个生长季,掌叶木幼苗株高和地径增长率、茎生物量、叶面积、气孔导度、SOD和过氧化物酶(POD)活性均变为在土壤石砾含量为60%时达到最大值,幼苗净光合速率、胞间CO_(2)摩尔分数变为在土壤石砾含量为40%时达到最大值,均显著高于对照组。综合分析表明,3个生长季内,掌叶木幼苗得分最高的土壤石砾含量分别为40%、40%、60%,对于连续3个生长季,幼苗在土壤石砾含量60%时生长状况最好。Handeliodendron bodinieri is an endangered species endemic in karst areas of southwest China.In order to explore the influence of soil gravel content on the growth and physiological characteristics of H.bodinieri seedlings in three consecutives growing seasons,annual H.bodinieri seedlings were used as experimental materials,different soil gravel content(0(control),20%,40%,60%,80%)were set,and the growth,photosynthesis and physiological indicators of each group of seedlings were determined and evaluated in three consecutive growth seasons.The results showed that in the first growing season,when the soil gravel content was 60%,the net photosynthetic rate of the seedlings was significantly higher than that of the control group;When the soil gravel content was 40%,the growth rate of seedling diameter,leaf biomass,transpiration rate,stomatal conductance,soluble protein mass fraction,and superoxide dismutase(SOD)activity were significantly higher than those of the control group;The intercellular CO_(2)molar fraction and soluble sugar mass fraction of seedlings were significantly higher than those of the control group when the gravel content was greater than 20%;There was no significant difference in plant height growth rate,leaf area,root,stem,and total biomass between the control group and the control group.In the second growing season,when the soil gravel content was 60%,the transpiration rate and soluble protein mass fraction of H.bodinieri seedlings were significantly higher than those of the control group;When the soil gravel content was 40%,the SOD activity of the seedlings was significantly higher than the control group,and the stem biomass was significantly higher than the control group when the soil gravel content was 20%.The other indicators showed similar trends to the first growth season.With the extension of the growing season,in the third growing season,the growth rate of plant height and ground diameter,stem biomass,leaf area,stomatal conductance,SOD and POD activities of H.bodinieri seedlings reached th

关 键 词：掌叶木幼苗 土壤石砾含量 生长季 生长及生理特性 

分 类 号：S794.9[农业科学—林木遗传育种]