摘要
以16种园林树木为研究对象,利用盆栽试验方法,采用美国CI-340便携式光合测定系统测定其水分利用特性。结果表明,1)园林树种于7:00-11:00的WUE明显高于13:00-17:00的WUE,针叶和灌木树种WUE日变化表现出整体下降的趋势,而阔叶和经济林树种均存在"午休"现象。2)经济林树种WUE生长中期最高,为(4.04±0.20)μmol·mmol^(-1);阔叶树种WUE为生长季初期最大,为(3.82±0.56)μmol·mmol^(-1);灌木树种生长末期最高,为(2.94±0.05)μmol·mmol^(-1);针叶树种WUE生长中期最高,为(2.73±0.25)μmol·mmol^(-1)。3)树种WUE为经济林树种((3.65±0.12)μmol·mmol^(-1))>阔叶树种((3.33±0.41)μmol·mmol^(-1))>灌木树种((2.90±0.27)μmol·mmol^(-1))>针叶树种((2.64±0.27)μmol·mmol^(-1)),经济林树种是针叶树种的1.38倍。4)WUE与Pn、Gs呈现出极显著正相关关系(P<0.01),与PAR呈显著性正相关关系(P<0.05),与VPD、t(a)、t(l)呈极显著负相关关系(P<0.01)。研究结果可为水资源的合理利用和园林绿地的科学管理提供理论依据。
The water use properties of sixteen landscape plants were measured using CI-340 photosynthetic with the method of potted plants.Results show: 1) Landscape plants' WUE at 7: 00-11: 00 were obviously higher than that at 13: 00-17: 00.The daily changes of coniferous and shrub trees' WUE showed the overall downward trend,and that of the broadleaf and economic tree species had"lunch break"phenomenon.2) Economic tree species' WUE was the highest at vigorous growth period.It was (4.04 ± 0.20) μmol·mmol^(-1).Broad leaved tree species' WUE were the biggest (3.82 ±0.56μmol·mmol^(-1)) at early growing season.Shrub tree species' WUE were the highest (2.94 ±0.05μmol·mmol^(-1)) at the end of growing season.Coniferous tree species' WUE was the highest at vigorous growth period.It was 2.73 ± 0.25μmol·mmol^(-1).3) The WUE order was economic tree species( (3.65 ± 0.12) μmol · mmol^(-1)) deciduous tree species( (3.33 ± 0.41) μmol·mmol^(-1)) shrub tree species( (2.90 ± 0.27) μmol·mmol^(-1)) coniferous tree species( (2.64 ± 0.27) μmol·mmol^(-1)),and economic tree species' WUE was the 1.38 times of the coniferous tree species'.4)The WUE presented a very significant positive correlation (P 0.01) with Pn and Gs,and showed a significant positive correlation (P 0.05) with PAR,and a very significant negative correlation (P 0.01) with VPD,t (a) and t (l).The results of the study provided theoretical basis for the rational use of water resources and the scientific management of landscape greenbelt.
出处
《河南农业大学学报》
CSCD
北大核心
2017年第4期487-494,520,共9页
Journal of Henan Agricultural University
基金
北京市农林科学院青年基金项目(QNJJ201532)
北京市农林科学院科技创新团队项目(JWKST201609)
创新能力建设专项项目(KJCX20150205)
2011协同创新中心(PXM2017_014207_000043)
关键词
园林树种
水分利用率
影响因子
landscape plants
water use efficiency
influence factors