摘要
为掌握樟子松(Pinus sylvestris var.mongolica)种苗阶段的抗旱性,采集三北地区彰武县、围场县、多伦县、右玉县、大同县5个不同引种区樟子松种子为试验材料,采用聚乙二醇(PEG-6000)溶液模拟不同干旱胁迫处理,研究了干旱胁迫对三北地区种子萌发与幼苗生长的影响。结果表明:干旱胁迫对不同引种区樟子松种子萌发和幼苗生长的影响存在差异,右玉县樟子松种子适应了在水势梯度-0.177Mpa干旱强度下萌发;彰武县、多伦县和围场县种子在水势梯度-0.735Mpa强干旱条件下可萌发。除大同县外,其他引种区种子随干旱胁迫增强而萌发减缓。围场县樟子松种子培育的幼苗在干旱胁迫下生长不良;除围场县外,其他引种区的幼苗胚根长在干旱胁迫条件下均较CK处理有所增加,幼苗胚轴直径随着干旱胁迫增加表现为低促高抑。樟子松种子萌发期抗旱性由强到弱依次为大同县>彰武县>多伦县>右玉县>围场县。在一定范围内,引种樟子松种子适应了当地环境条件,引种地区越干旱,樟子松种子的抗旱性越强。
In order to understand the drought resistance of Pinus sylvestris var.mongolica seeds germination and seedling growth, the seeds of P.sylvestris from Zhangwu County, Weichang County, Duolun County, Youyu County, Datong County were collected as study materials, and polyethylene glycol(PEG6000) solution was used to simulate different drought stress treatments.The effects of drought stress on seed germination and seedling growth in these regions were studied and the results showed that the seed germination and seedling growth of P.sylvestris from different introduction regions responded differently to drought stress.The seeds of P.sylvestris from Youyu County adapted to germinate under drought level with a water potential gradient of-0.177 Mpa;seeds from Zhangwu County, Duolun County and Weichang County could germinate under drought level with a water potential gradient of-0.735 Mpa.Except the seeds of P.sylvestris from Datong County, the stronger the drought stress, the slower the germination in other introduction regions.Seedlings of P.sylvestris from Weichang County did not grow well under drought stress.Except Weichang County, the radicle length of seedlings in other introduction regions increased under drought stress compared with CK treatment, and the low drought stress could promote, but high drought stress could inhibit the diameter of seedling embryo axis with the increase of drought stress.According to the analysis, the drought resistance of P.sylvestris seeds in the germination stage from strong to weak was as follows: Datong County>Zhangwu County>Duolun County>Youyu County>Weichang County.Within a certain range, the seeds of P.sylvestris adapted to local environmental conditions, with the drought resistance of the seeds of P.Sylvestris becoming stronger as the region changing to dryer.
作者
张日升
王东丽
王翠萍
迟琳琳
ZHANG Risheng;WANG Dongli;WANG Cuiping;CHI Linlin(Liaoning Institute of Sandy Land Control and Utilization,Fuxin,Liaoning 123000,China;Liaoning Zhanggutai Desert Ecosystem Research Station,Fuxin,Liaoning 123000,China;College of Environmental Science and Engineering,Liaoning Technical University,Fuxin,Liaoning 123000,China;Northwest Surveying,Planning and Designing Institute of National Forestry and Grassland Administration,Xi′an 710048,China)
出处
《林业资源管理》
北大核心
2022年第3期60-66,共7页
Forest Resources Management
基金
辽宁省农业科学院基本科研业务费计划项目(2021HQ1913)。
关键词
樟子松
种子萌发
幼苗生长
抗旱性
三北地区
Pinus sylvestris var.Mongolica
seed germination
seedling growth
drought resistance
Three Northern region
