摘要
[目的]明确不同造林树种水分利用特征差异,为干旱半干旱沙区植被恢复和重建过程中造林树种的选择提供理论依据。[方法]通过测定科尔沁沙地南缘主要造林树种樟子松(Pinus sylvestris var.mongolica)、彰武小钻杨(Populus×xiaozhuanica)、油松(Pinus tabuliformis)和白榆(Ulmus pumila)生长季(6—10月)叶片δ^(13)C值和不同深度土壤含水量,比较了不同树种的水分利用效率(δ^(13)C指示),并探讨了水热因子对树木水分利用效率的影响。[结果]樟子松、油松和白榆叶片δ^(13)C值随季节变化逐渐降低,而彰武小钻杨叶片δ^(13)C值随季节变化呈先增加后降低趋势;从整个生长季δ^(13)C平均值来看,樟子松叶片δ^(13)C值(−26.92‰±0.11‰)显著高于彰武小钻杨(−27.40‰±0.10‰)和油松(−27.57‰±0.14‰),而彰武小钻杨和油松显著高于白榆(−29.23‰±0.17‰)。叶片δ^(13)C逐月变化量与水热因子的响应程度因树种而异,樟子松和白榆叶δ^(13)C逐月变化量与水热因子相关关系不显著,而油松叶δ^(13)C逐月变化量与降水量、气温和湿度呈显著负相关关系,彰武小钻杨叶δ^(13)C逐月变化量与气温呈显著正相关关系。[结论]樟子松具有较高的水分利用效率,彰武小钻杨和油松次之,白榆最低。不同树种水分利用效率差异不仅与树种生物学特性有关,而且与受外界水热因子响应程度有关。
[Objective]Determining the water use characteristics of different afforestation tree species would supply a theoretical basis for the selection of tree species in vegetation restoration and reconstruction in semiarid and arid sandy lands.[Method]Leaf δ^(13)C values of Pinus sylvestris var.mongolica,Populus×xiaozhuanica,Pinus tabuliformis,and Ulmus pumila trees in the south edge of the Horqin Sandy Land were measured together with monitoring soil water content at different depths to compare their water use efficiency(indicative of leaf δ^(13)C)during the growing season,and the effect of hydrothermal factors on the water use efficiency was discussed.[Result]The leaf δ^(13)C values of P.sylvestris var.mongolica,P.tabuliformis,and U.pumila trees decreased with seasons,whereas the leaf δ^(13)C values of P.×xiaozhuanica firstly increased and then declined during the measurement period.In addition,the mean leaf δ^(13)C value was higher in P.sylvestris var.mongolica trees(−26.92‰±0.11‰)than in P.×xiaozhuanica(−27.40‰±0.10‰)and P.tabuliformis(−27.57‰±0.14‰)trees,whereas the mean leaf δ^(13)C value was higher in P.×xiaozhuanica and P.tabuliformis trees than in U.pumila trees(−29.23‰±0.17‰).The responses of the leaf δ^(13)C monthly values to hydrothermal factors varied with tree species.There were no significant relationships between leaf δ^(13)C monthly values and hydrothermal factors for P.sylvestris var.mongolica and U.pumila trees,whereas a significant negative relationship between monthly change in leaf δ^(13)C and precipitation,air temperature,or relative humidity was observed for P.tabuliformis trees.However,a significant positive relationship between leaf δ^(13)C monthly change values and air temperature was found for P.×xiaozhuanica trees.[Conclusion]The water use efficiency is the highest in P.sylvestris var.mongolica trees,followed by P.×xiaozhuanica and P.tabuliformis trees and the lowest value in U.pumila trees.In addition,water use efficiency for different tree species is not only related to biological characteristics but also related to the degree of influence by hydrothermal factors.
作者
于丰源
张金鑫
孙一荣
宋立宁
YU Feng-yuan;ZHANG Jin-xin;SUN Yi-rong;SONG Li-ning(Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China;CAS Key Laboratory of Forest Ecology and Management,Institute of Applied Ecology,Shenyang 110016,Liaoning,China;Qingyuan Forest CERN,National Observation and Research Station,Shenyang 110016,Liaoning,China)
出处
《林业科学研究》
CSCD
北大核心
2022年第4期179-187,共9页
Forest Research
基金
黑土地保护与利用科技创新工程专项资助(XDA28080305)
国家自然科学基金面上项目(31770757)。
关键词
樟子松
杨树
油松
白榆
水分利用效率
Pinus sylvestris var.mongolica
Populus×xiaozhuanica
Pinus tabuliformis
Ulmus pumila
water use efficiency.
作者简介
通讯作者:宋立宁,研究员,硕士生导师。研究方向:防护林经营,Email:liningsong@iae.ac.cn。
