[1]张马啸,黄小艳,邹志广,等. 干旱胁迫对滨海沙地主要造林树种水力结构的影响[J].西北林学院学报,2024,39(1):125-131.[doi:10.3969/j.issn.1001-7461.2024.01.17]
　ZHANG Ma-xiao,HUANG Xiao-yan,ZOU Zhi-guang,et al. Effects of Drought Stress on Hydraulic Structure of Main Afforestation Tree Species in Coastal Sandy Land[J].JOURNAL OF NORTHWEST FORESTRY UNIVERSITY,2024,39(1):125-131.[doi:10.3969/j.issn.1001-7461.2024.01.17]
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 干旱胁迫对滨海沙地主要造林树种水力结构的影响()
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《西北林学院学报》[ISSN:1001-7461/CN:61-1202/S]

卷:
第39卷
期数:
2024年第1期
页码:
125-131
栏目:
出版日期:
2024-01-31

文章信息/Info

Title:
 Effects of Drought Stress on Hydraulic Structure of Main Afforestation Tree Species in Coastal Sandy Land
文章编号:
1001-7461(2024)01-0125-07
作者:
 张马啸1; 黄小艳2; 邹志广2; 李树斌2; 潘辉3; 周丽丽4*
 (1.福建农林大学 资源与环境学院，福建 福州 350002；2.福建农林大学 林学院，福建 福州 350002；3.闽江学院 经济与管理学院，福建 福州 350108；4.闽江学院 地理与海洋学院，福建 福州 350108）
Author(s):
 ZHANG Ma-xiao1; HUANG Xiao-yan2; ZOU Zhi-guang2; LI Shu-bin2; PAN Hui3; ZHOU Li-li4*
 (1.College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou 350002,Fujian,China; 2.College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,Fujian,China; 3.College of Economics and Management,Minjiang University,Fuzhou 350108,Fujian,China; 4.College of Geography and Oceanography,Minjiang University,Fuzhou 350108,Fujian,China)
关键词:
 ; 滨海造林树种; 干旱胁迫; 水势; 导水率; 比导率; 适应策略
Keywords:
 ; coastal afforestation tree species;  drought stress;  water potential;  water conductivity;  specific conductivity;  adaptation strategy
分类号:
S728
DOI:
10.3969/j.issn.1001-7461.2024.01.17
文献标志码:
A
摘要:
 以1年生木麻黄、尾巨桉、马大相思和黑木相思幼苗为研究对象，设置对照、轻度、中度、重度处理，探讨不同滨海沙地造林树种在干旱胁迫条件下叶片水势及不同器官水力学性状的变化特征。结果表明，4个树种的叶片水势在干旱胁迫下均低于对照，但不同叶位的叶片水势对干旱胁迫的响应不同。木麻黄中部和顶部叶片的水势在中度胁迫时增高，尾巨桉和马大相思底部叶在重度干旱时水势显著下降（P＜0.05），其中部和顶部叶水势在重度干旱时上升，黑木相思各叶位在干旱条件下的平均水势均高于其他3个树种；尾巨桉和马大相思根部的导水率均随干旱胁迫程度的增加而降低，黑木相思根和枝的导水率在重度干旱时却较中度升高，4个树种茎的导水率在遭受轻度干旱时均显著高于对照；随干旱胁迫程度的增加，4个树种不同器官的比导率均表现为先升后降再降的趋势（除黑木相思的根和枝外）。可见，不同滨海树种对不同干旱胁迫程度采取的适应策略不同，马大相思和黑木相思采取降低根的导水率和比导率、提高茎和枝的导水率和比导率来适应轻度干旱，而木麻黄则采取提高根和茎的导水率、降低枝的导水率来适应轻度干旱。在中度和重度干旱胁迫下，木麻黄、尾巨桉和马大相思各器官的比导率均下降，黑木相思通过降低根和枝的导水率和比导率、增大水势延迟叶片脱水来适应中度干旱逆境，结果对滨海沙地耐旱树种的选育及优化配置具有重要指导意义。
Abstract:
 One-year-old seedlings of four main afforestation tree species in coastal sandy land were used as the research objects,including Casuarina equisetifolia,Eucalyptus urophylla×E.grandis,Acacia mangium×A.auriculiformis and A.melanoxylon,which were subject to drought stress with different levels,no stress (control),mild,moderate and severe drought stress to examine the variation characteristics of leaf water potential and hydraulic properties of different organs.The results showed that the leaf water potential of the four tree species was lower than that of the control under drought stress,but the response of leaf water potential at different leaf positions to drought stress was different.The water potential of the middle and top leaves of C.equisetifolia increased under moderate drought stress,and the water potential of the bottom leaves of E.urophylla×E.grandis and A.mangium×A.auriculiformis decreased significantly under severe drought stress (P<0.05 ).Their water potentials of the middle and top leaves increased under severe drought,and the average water potential of each leaf position of A.melanoxylon was higher than that of the other three tree species under drought conditions.The hydraulic conductivity of roots of E.urophylla×E.grandis and A.mangium×A.auriculiformis decreased with the increase of drought stress.The hydraulic conductivity of roots and branches of A.melanoxylon increased in severe drought compared with moderate drought.The hydraulic conductivity of stems of four tree species was significantly higher than that of the control under mild drought stress.With the increase of drought stress,the specific conductivity of different organs of the four tree species increased first,decreased and then decreased (except for the roots and branches of A.melanoxylon).It can be seen that different coastal tree species adopt different adaptation strategies to different degrees of drought stress.A.mangium×A.auriculiformis and A.melanoxylon adapt to mild drought by reducing the hydraulic conductivity and specific conductivity of roots and increasing the hydraulic conductivity and specific conductivity of stems and branches,while C.equisetifolia adapts to mild drought by increasing the hydraulic conductivity of roots and stems and reducing the hydraulic conductivity of branches.Under moderate and severe drought stress,the specific hydraulic conductivity of C.equisetifolia,E.urophylla×E.grandis and A.mangium decreased,while A.melanoxylon adapted to moderate drought stress by reducing the hydraulic conductivity and specific hydraulic conductivity of roots and branches,increasing water potential and delaying leaf dehydration.The results have important guiding significance for the selection and optimization of drought-tolerant tree species in coastal sandy areas.

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备注/Memo

备注/Memo:
 收稿日期：2023-02-20修回日期：2023-09-25
基金项目：福建省林业科学技术研究项目（2022FKJ30）；福州市科技计划项目（2022-S-004）。
第一作者：张马啸。研究方向：植物逆境生理。E-mail:sxzmx6868@126.com
*通信作者：周丽丽，博士，副研究员，硕士生导师。研究方向：森林生态。E-mail:fjzhoulili@126.com
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