贺兰山10种典型植物光合及水分利用效率特征研究
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引用本文:陈高路,庞丹波,马进鹏,万红云,王继飞,李静尧,陈 林,李学斌.贺兰山10种典型植物光合及水分利用效率特征研究[J].西北植物学报,2021,41(2):290~299
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作者单位
陈高路1,2,3,庞丹波2,3,马进鹏2,3,万红云2,3,王继飞4,李静尧4,陈 林2,3,李学斌2,3* (1 宁夏大学 农学院, 银川 750021
2 宁夏大学西北退化生态系统恢复与重建教育部重点实验室, 银川 750021
3 宁夏大学西北土地退化与生态恢复国家重点实验室培育基地, 银川 750021
4 宁夏贺兰山国家级自然保护区管理局, 银川 750021) 
基金项目:宁夏重点研发计划项目(2018BFG02015);
中文摘要:为了探究贺兰山不同乔灌草的光合生理特性及其对自然环境的适应特性和机制,该研究采用Li 6400XT便携式光合仪测定了贺兰山10种乔灌草气体交换参数及自然环境因子并分析其相关性。结果表明:(1)净光合速率(Pn)日均值从大到小为披针叶黄华>灰榆>山杨>栒子>冰草>油松>小叶忍冬>小檗>青海云杉>苔草,从不同生活型来看表现为乔木>草本>灌木。(2)青海云杉、油松、灰榆、小檗、栒子和小叶忍冬的Pn日变化曲线为单峰型,山杨、披针叶黄华、苔草和冰草的Pn日变化曲线为双峰型,具有明显的光合“午休”现象,山杨和冰草主要为非气孔因素所致,披针叶黄华和苔草主要为气孔因素所致。(3)相比同种生活型的其他植物,青海云杉、油松、小叶忍冬和披针叶黄华具有较高的水分利用效率(WUE)日均值。(4)通径分析表明,乔木和灌木植物的主要决定因子为光照强度(PAR),主要限制因子为叶片温度(Tl)和饱和蒸汽压亏缺(VPD);草本植物的主要限制因子为气温(Ta)和Tl。研究发现,贺兰山东麓不同乔木、灌木、草本植物的光合特性日变化规律不尽相同,相比同种生活型的其他植物,青海云杉、油松、小叶忍冬和披针叶黄华具有较好的抗旱性,能适应较为干旱的气候环境。
中文关键词:贺兰山  乔灌草  光合特性  水分利用效率  通径分析
 
Study on Photosynthesis and Water Use Efficiency of Ten Typical Plants in Helan Mountain
Abstract:In order to explore the photosynthetic physiological characteristics of different trees, shrubs, herbs in Helan Mountain and their adaptive characteristics and mechanisms to the natural environment, we used a Li 6400XT portable photosynthesis instrument to determine the gas exchange parameters and natural environmental factors of ten types of trees, shrubs and herbs in Helan Mountain and analyzed their correlations. The results show that: (1) the daily mean value of net photosynthetic rate (Pn) changed in a rank of Thermopsis lanceolata>Ulmus glaucescens>Populus davidiana>Cotoneaster hissaricus>Agropyron cristatum>Pinus tabuliformis>Lonicera microphylla>Berberis thunbergii>Picea crassifolia>Carex muliensis, and from the perspective of different life types, it was represented as tree > herb > shrub. (2) The diurnal variation curves of Pn of P. crassifolia, P. tabuliformis, U. glaucescens, B. thunbergii, C. hissaricus and L. microphylla were single peaks, while the Pn diurnal curves of P. davidiana, T. lanceolata, C. muliensis and A. cristatum were double peak shape, with obvious photosynthetic “noon break” phenomenon. The phenomenon of P. davidiana and A. cristatum were mainly caused by non stomatal factors, while T. lanceolata and C. muliensis were mainly caused by stomatal factors. (3) Compared with other plants of the same life type, P. crassifolia, P. tabuliformis, L. microphylla and T. lanceolata had higher daily mean water use efficiency (WUE). (4) Path analysis showed that light intensity (PAR) was the main determinant factor for trees and shrubs, while leaf temperature (Tl) and saturated vapor pressure deficit (VPD) were the main limiting factors.The main limiting factors for herbaceous plants were air temperature (Ta) and Tl. The study suggested that diurnal variations of photosynthetic characteristics of different arbor shrub grass in Helan Mountain show different patterns. Compared with other plants of the same life type, P. crassifolia, P. tabuliformis, L. microphylla and T. lanceolata have better drought resistance and can adapt to relatively dry climate environment.
keywords:Helan Mountain  tree, shrub, herb  photosynthetic characteristics  water use efficiency  path analysis
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