摘要
为探讨黄土高原中部绿化植物的光合生理特性,了解不同季节植物的光合生理适应机制,运用Li-6400XT便携式光合仪,对兰州北山3种典型绿化树种山杏(Prunus sibirica)、刺槐(Robinia pseudoacacia)及新疆杨(Populus alba)在不同季节的光合响应曲线及光合日变化进行了测定。结果表明:(1)山杏和刺槐净光合速率(Pn)日变化呈"单峰"曲线,新疆杨Pn日变化呈不对称的"双峰"曲线。(2)山杏、刺槐及新疆杨均在夏季有较高的最大净光合速率(8.29、8.79、12.94μmol·m^-2·s^-1),秋季有较高的表观量子效率(0.058、0.032、0.073μmol·μmol^-1)和较低的光补偿点(8.69、3.44、4.72μmol·m^-2·s^-1)及暗呼吸速率(0.48、0.11、0.33μmol·m^-2·s^-1),光饱和点在季节间有显著性差异。(3)水分利用效率整体表现为山杏和刺槐在秋季较高(1.97、4.66μmol·mmol^-1),新疆杨夏季较高(7.29μmol·mmol^-1)。(4)新疆杨净光合速率及水分利用效率较高,对光的适应范围较广,刺槐利用强光的能力较强,水分利用效率居中,山杏耐荫性较高,水分利用效率较低。(5)通径分析表明,在春季大气湿度(RH)、土壤温度(Ts)、大气温度(Ta)均对3种植物Pn起抑制作用;夏季中山杏和刺槐与春季相同,所研究的4种环境因子均对新疆杨Pn起促进作用;在秋季3种植物Pn均表现为受到Ts正促进影响,受到PAR、RH、Ta抑制作用。综上,3种绿化树种随季节变化表现出积极的生长模式,其中新疆杨对生境的适应性强于山杏和刺槐。本研究结果可为半干旱区造林绿化树种的引种栽培和应用推广提供依据。
To explore the photosynthetic physiological characteristics of greening tree species and understand the mechanisms of photosynthetic physiological adaptation of plants in different seasons in the central Loess Plateau,photosynthetic response curve and diurnal variation of three typical tree species(Prunus sibirica,Robinia pseudoacacia and Populus alba)in different seasons were measured using Li-6400 XT portable photosynthetic instrument.The results showed that:(1)The diurnal variation of net photosynthetic rate(Pn)of P.sibirica and R.pseudoacacias showed a single peak curve,while that of P.alba showed an asymmetric double peak curve.(2)P.sibirica,R.pseudoacacia,and P.alba had higher maximum photosynthetic rate(8.29,8.79,12.94μmol·m^-2·s^-1)in summer,and higher apparent quantum efficiency(0.058,0.032,0.073μmol·μmol^-1),lower light compensation point(8.69,3.44,4.72μmol·m^-2·s^-1)and dark respiration rate(0.48,0.11,0.33μmol·m^-2·s^-1)in autumn.There were significant seasonal variations in light saturation point.(3)Water use efficiency of P.sibirica and R.pseudoacacia was higher in autumn(1.97,4.66μmol·mmol^-1),but that of P.alba was higher in summer(7.29μmol·mmol^-1).(4)P.alba had higher net photosynthetic rate and water use efficiency,with a wide range of light adaptation.R.pseudoacacia had a strong ability to use strong light,but with moderate water use efficiency.P.sibirica had higher shade tolerance and lower water use efficiency.(5)Results of path analysis showed that,relative humility(RH),soil temperature(Ts)and air temperature(Ta)all inhibited Pnof the three species in spring.The above-mentioned environmental factors showed similar effects on apricot and R.pseudoacacia in summer to that in spring.The four environmental factors examined here promoted the Pnof P.alba;in autumn.Pn of the three species was positively promoted by Tsbut inhibited by PAR,RH and Ta.In general,those three tree species showed a positive growth pattern with seasonal changes,among which the adaptability of P.alba was stro
作者
刘旻霞
夏素娟
穆若兰
南笑宁
李全弟
蒋晓轩
LIU Min-xia;XIA Su-juan;MU Ruo-lan;NAN Xiao-ning;LI Quan-di;JIANG Xiao-xuan(College of Geography and Environmental Sciences,Northwest Normal Uni-versity,Lanzhou 730070,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2020年第12期4098-4109,共12页
Chinese Journal of Ecology
基金
国家自然科学基金资助项目(31760135和31360114)资助。
关键词
兰州北山
绿化树种
光合日变化
生理参数
通径分析
Northern Mountain of Lanzhou
greening tree species
diurnal variation of photosynthesis
physiological parameter
path analysis
