灌溉条件下3种沙生灌木光合特性及其与生态因子的关系  

Photosynthetic Characteristics and Relationship with the Ecological Factors of Three Sandy Shrubs under Irrigation Condition

作　　者：罗青红[1] 吉小敏[1] 宁虎森[1] 雷春英[1] 

机构地区：[1]新疆林业科学院造林治沙研究所,乌鲁木齐830063

出　　处：《西北植物学报》2014年第11期2296-2302,共7页Acta Botanica Boreali-Occidentalia Sinica

基　　金：‘十二五’国家科技计划课题(2012BAD16B0102;2012BAD16B0305)

摘　　要：以沙地种植的沙地灌木桑(灌木桑)、红花罗布麻(红麻)和沙木蓼幼苗为试验材料,活体测定了其叶片的光合生理生态参数日进程、光合-光强响应及光合-CO2浓度响应特征,分析了净光合速率(Pn)与主要生态因子的关系。结果表明:(1)灌木桑、红麻和沙木蓼的净光合速率日动态曲线分别呈"双峰型"、"单峰型"和"持续下降型"。(2)沙木蓼的水分利用效率(WUE)和光能利用效率(QUE)明显高于红麻及灌木桑;灌木桑对光照强度具有强的生态适应幅,而红麻利用光强的范围较窄,光合潜能不高,沙木蓼的最大净光合速率(Pmax)最高,其植株的光合能力也最强;红麻具有最高的CO2补偿点和饱和点,同时具有较小的Pmax值。(3)气温(Ta)对灌木桑和红麻Pn的直接、间接影响均较大,而水汽压亏缺(VPD)偶联Ta对沙木蓼、红麻的Pn有较大的间接影响。研究认为,依据各灌木的光合生理适应性特征,沙木蓼可在干旱沙区光照较强的阳坡等区域种植,灌木桑可选择在绿洲与荒漠的过渡带造林,红麻则可在光强较弱的阴坡或坡间低地造林。In this paper,diurnal dynamics of photosynthesis physical-ecological characters,Pn-PAR and PnCiresponse curves were measured,and the relationship between Pnand main ecological factors was analyzed in three young sandy plants seedlings.The results showed that：（1）Diurnal dynamics curves of net photosynthetic rate（Pn）of Morus alba,Apocynum lancifolium and Atraphaxis bracteata appeared ＂bimodalpeak＂,＂single-peak＂and＂continued to decline＂types,respectively.（2）Water utility efficiency（WUE）and light utility efficiency（QUE）of A.bracteata was higher than that of A.lancifoliumand M.alba＇s.M.alba has a strong ecological adaptation range for light intensity,the range of using light intensity of A.lancifoliumis relatively narrow,so photosynthetic potential is not high.The maximum net photosynthetic rate（Pmax）of A.bracteata was the highest,which suggested its photosynthetic capacity was higher also,A.lancifolium has the highest CO2 compensation point（CCP）and saturation point（CSP）,at the same time,with smaller Pmax.（3）The atmospheric temperature（Ta）has greater direct and indirect impact on Pnof M.alba and A.lancifolium,and vapor pressure deficit（VPD）coupling Tahad larger indirect effects on Pnof A.bracteataand A.lancifolium.To sum up,in terms of photosynthetic physiological adaptability.As preventing and desertification controling plant material,A.bracteata can be planted in the sandy slope with fulllight,M.albain the transition zone of oasis and desert afforestation,and A.lancifoliumin the sandy slope with weak light condition.

关 键 词：净光合速率 日动态 响应曲线 生态因子 

分 类 号：Q945.79[生物学—植物学]