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《Journal of Glaciology and Geocryology》 2012-01
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Responses of Sabina przewalskii and Picea crassifolia Seedlings to Different Draught Stress of Soil in Ecophysiological Characteristics

ZHAO Chang-ming1,2,GAO Xian-liang 2,MA Ren-yi2,CHEN Li-tong2, CHEN Tuo1,REN Jia-wen1(1.State Key Laboratory of Cryospheric Sciences,Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences,Lanzhou Gansu 730000,China;2.Key Laboratory of Arid and Grassland Ecology of Ministry of Education,School of Life Sciences,Lanzhou University,Lanzhou Gansu 730000,China)  
The differences of ecophysiological features in four levels of field capacity: 80%,60%,40% and 20%,respectively,regarded as well watered,mild,moderate and severe drought stress,were studied using Sabina przewalskii and Picea crassifolia,two dominant species in the subalpine coniferous forest zone in the northeastern Tibetan Plateau,as objects.It is revealed that drought stress significantly decreases the folia relative water content(RWC),photosynthetic rate(Pn),stomatal conductance(Gs) and transpiration rate(E),and increases the foliar carbon stable isotope composition(δ13C),nitrogen use efficiency(NUE),instantaneous water use efficiency(WUEi),content of malonaldehyde(MDA) and activity of superoxide dismutase(SOD) of S.przewalskii and P.crassifolia.Their distribution in biomass(i.e.,root shoot ratio,R∶S) are different,i.e.,the R∶S of P.crassifolia decreases gradually,inversely,the one of S.przewalskii increases gradually.However,there is significant divergence to drought stress response in the two species.The effect of P.crassifolia is larger than that of S.przewalskii,illustrating that P.crassifolia is sensitive to water stress.All results indicate that S.przewalskii possesses more drought tolerance than P.crassifolia.
【Fund】: 冰冻圈科学国家重点实验室开放基金项目(SKLCS 09-01);; 中国博士后科学基金(20080430795);; 王宽诚教育基金会和教育部新世纪优秀人才支持计划(NCET-08-0257)资助
【CateGory Index】: S791
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