土壤含水量对樟子松幼苗非结构性碳水化合物及生长的影响  

Effects of soil water content on non-structural carbohydrates and growth of Pinus sylvestris var.mongolica seedlings

作　　者：王凯 芦珊 刘畅 康宏樟 吕林有 焦向丽 WANG Kai;LU Shan;LIU Chang;KANG Hongzhang;LYU Linyou;JIAO Xiangli(College of Environmental Science and Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China;School of Design,Shanghai Jiao Tong University,Shanghai 200240,China;Liaoning Institute of Sandy Land Control and Utilization,Fuxin 123000,Liaoning,China;Hubei Province Engineering Consulting Co.,Ltd,Wu-han 430071,China)

机构地区：[1]辽宁工程技术大学环境科学与工程学院,辽宁阜新123000 [2]上海交通大学设计学院,上海200240 [3]辽宁省沙地治理与利用研究所,辽宁阜新123000 [4]湖北省工程咨询股份有限公司,武汉430071

出　　处：《生态学杂志》2023年第3期617-625,共9页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(31400613);辽宁省“兴辽英才计划”项目(XLYC1807017)资助。

摘　　要：为明确樟子松幼苗在不同土壤含水量下的生长适应策略,设置不同土壤含水量(80%、60%、40%和20%田间持水量(SFC))和持续时间(15、30、45和60 d),研究不同器官中可溶性糖、淀粉、非结构性碳水化合物及生物量的变化规律。结果表明:随着土壤含水量减少,樟子松幼苗株高和基径及一年生叶、细根和总生物量呈下降趋势。80%SFC条件下,可溶性糖含量在枝干中较高,在当年生叶和细根中较低;淀粉在枝干和粗根中较高。60%和40%SFC条件下,可溶性糖含量在叶片和细根中较高,淀粉含量分别在枝干和一年生叶中较高。20%SFC条件下,可溶性糖含量在当年生叶较高,在一年生叶较低;淀粉含量在细根中较高,在枝干和粗根中较低。因而,樟子松幼苗在80%SFC下具有更高的生长速率及抗逆性,在60%和40%SFC下具有更高的资源利用效率和较优的碳储存策略,在20%SFC下生长停滞。为促进科尔沁沙地樟子松林天然更新,土壤含水量应维持在7%以上。To clarify growth adaptation strategies of Pinus sylvestris var.mongolica seedlings under different soil water contents,two-year-old seedlings were grown under different water conditions,i.e.,80%,60%,40%,and 20%of soil field water capacity(SFC)for 15,30,45,and 60 days.We measured the contents of soluble sugar,starch,non-structural carbohydrate and biomass of different organs.The results showed that height,basal diameter,and one-year-old needle,fine root and total biomass decreased with decreasing soil water content.Under soil water content of 80%SFC,soluble sugar concentrations were higher in stems and lower in current-year needles and fine roots,while starch concentrations were higher in stems and coarse roots.Under 60%and 40%SFC,soluble sugar concentrations were higher in needles and fine roots,while starch concentrations were higher in stems and one-year-old needles.Under 20%SFC,soluble sugar concentrations were higher in current-year needles and lower in one-year-old needles,while starch concentrations were higher in fine roots and lower in stems and coarse roots.These results indicated that P.sylvestris var.mongolica seedlings had higher growth rate and stress resistance under 80%SFC,exhibited higher resource utilization efficiency and optimal carbon storage strategy under 60%and 40%SFC,and stopped growing under 20%SFC.Therefore,soil water content should be maintained above 7%to promote natural regeneration of P.sylvestris var.mongolica plantation in Horqin Sandy Land.

关 键 词：幼苗生长 碳限制 生物量分配 水分阈值 天然更新 

分 类 号：S791.253[农业科学—林木遗传育种] S714.2[农业科学—林学]