Light Response of Shepherdia Argentea and Hippophae Rhamnoides Seedlings Under Different Soil Moisture Conditions

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Light Response of Shepherdia Argentea and Hippophae Rhamnoides Seedlings Under Different Soil Moisture Conditions
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                        DONG MeiDONG Mei
Key Laboratory of Soil and Water Conservation and Desertification Combating of the Ministry of Education, and College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
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QIN JingQIN Jing
Key Laboratory of Soil and Water Conservation and Desertification Combating of the Ministry of Education, and College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
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HE Kang-ningHE Kang-ning
Key Laboratory of Soil and Water Conservation and Desertification Combating of the Ministry of Education, and College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
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ZHANG Yi-yuanZHANG Yi-yuan
Key Laboratory of Soil and Water Conservation and Desertification Combating of the Ministry of Education, and College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
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LI An-chaoLI An-chao
Key Laboratory of Soil and Water Conservation and Desertification Combating of the Ministry of Education, and College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
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SUN Xiao-hanSUN Xiao-han
Key Laboratory of Soil and Water Conservation and Desertification Combating of the Ministry of Education, and College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
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GUO Qian-qianGUO Qian-qian
Key Laboratory of Soil and Water Conservation and Desertification Combating of the Ministry of Education, and College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
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Affiliation: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)
Clc Number:S154.36
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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(p_n),transpiration rate(T_r)and water use efficiency(WUE)of the two species were both increased with PAR in the beginning.With continued increase of PAR,p_nand WUE ofS.argentea andH.rhamnoidesseedlings declined but T_rstill increased.With increasing soil water contents(SWC),p_n,T_r,Stomatal conductance(G_s)and intercellular CO₂concentration(C_i)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

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董梅,秦景,贺康宁,张益源,李安超,孙晓涵,郭倩倩.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[J].水土保持通报英文版,2011,(1):81-86

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Received:June 10,2010
Revised:August 01,2010
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Online: October 25,2012
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