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银水牛果和沙棘幼苗在不同土壤水分条件下的光响应研究
答竹君,艾应伟,宋婷,郭培俊,王倩,李伟
1. 四川大学,生命科学学院,生物资源与生态环境教育部重点实验室,四川,成都,610064
2. 中国科学院,成都山地灾害与环境研究所,四川,成都,610041
摘要:
在黄土高寒区,通过人工控制土壤水分的方法,利用Li-6400便携式光合测定系统对银水牛果和沙棘苗木叶片的气体交换参数因子的光响应进行研究.结果表明,2种灌木的净光合速率、蒸腾速率、水分利用效率随着光强的增大而增强,而随着光强进一步增大,净光合速率、水分利用效率却出现下降的趋势,蒸腾速率仍继续增大.随着土壤含水量的增加,2种灌木的净光合速率、蒸腾速率、气孔导度、胞间CO2浓度逐渐增大,水分利用效率先上升,在轻度水分胁迫下达到最大值后下降.在相同土壤含水量下,银水牛果光补偿点明显小于沙棘,光饱和点大于沙棘,光能利用率高于沙棘;银水牛果的表观量子效率大于沙棘,在低光强下的光合能力较高.在水分胁迫下,2种灌木相比,沙棘比银水牛果更易受强光胁迫;银水牛果对弱光的利用能力高于沙棘,水分利用效率高于沙棘,耐旱生产力较高.
关键词:  净光合速率  蒸腾速率  水分利用效率  光响应
DOI:
分类号:S154.36
基金项目:国家"十一五"科技支撑项目"黄土高原西部高寒区水土保持型林草植被恢复技术试验示范"(2006BAD03A1203);高等学校博士学科点专项科研基金项目"黄土高原干旱区水土保持林林地土壤干化空间格局及其发生机理研究"(20070022028)
Light Response of Shepherdia Argentea and Hippophae Rhamnoides Seedlings Under Different Soil Moisture Conditions
DA Zhu-jun,AI Ying-wei,SONG Ting,GUO Pei-jun,WANG Qian,LI Wei
DA Zhu-jun1,AI Ying-wei1,SONG Ting1,GUO Pei-jun1,WANG Qian1,LI Wei2(1.Key Laboratory of Bio-resources and Eco-environment of the Ministry of Education,College of Life Science,Sichuan University,Chengdu,Sichuan 610064,China,2.Institute of Mountain Hazards and Environment,CAS,Sichuan 610041,China)
Abstract:
In the alpine region of Loess Plateau,light responses ofS.argenteaandH.rhamnoidesseedlings under different soil moisture con-ditions were analyzed in terms of gas exchange parameters using Li-6400 portable photosynthesis system.The results show that net photo-synth-esis rate(pn),transpiration rate(Tr)and water use efficiency(WUE)of the two species were both increased with PAR in the beginning.With continued increase of PAR,pnand WUE ofS.argentea andH.rhamnoidesseedlings declined but Trstill increased.With increasing soil water contents(SWC),pn,Tr,Stomatal conductance(Gs)and intercellular CO2concentration(Ci)of two species were both increased,while WUE increased first and then declined after reaching the maximum under the mild water-stress condition.Under similar soil moistureconditions, light compensation point(LCP)ofS.argenteawas clearly lower than that ofH.rhamnoides,light saturation point(LSP)and efficiency of light energy utilization ofS.argenteawere higher than those ofH.rhamnoides,and the apparent quantum yield(α)in the leaves ofS.argenteawas higher than that ofH.rhamnoides.Compared withH.rhamnoides,S.argenteaexhibited higher photosynth-etic capacity at low PAR.Contrastive analysis indicates thatH.rhamnoidesshowed stronger response to high PAR under the waterstress condition,whileS.argentea had higher utilization capacity of low PAR and WUE.Overall,S.argenteaseedlings displayed higher drought-stressed productivity thanH.rhamnoides seedlings.
Key words:  net photosynthesis rate  transpiration rate  water use efficiency  light response