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1、sHq/;+#srq文建雷1 , 刘志龙2 , 王姝清1(1.jS/v3S,3712100,2.jS/vLj,3712100)K1:以1年生元宝枫幼苗为材料,采用盆栽控水法,研究了水分胁迫条件下元宝枫光合特征及其水分利用效率的变化。结果表明,随胁迫程度的加重和时间延长,光合速率(Pn)和水分利用效率(WUE)依次降低。在轻度和中度胁迫下,Pn的降低既有气孔因素又有非气孔因素的限制,严重胁迫条件下, Pn的降低主要是非气孔因素引起的。轻度水分胁迫下,元宝枫Pn的日变化为单峰曲线,中度胁迫下呈双峰曲线;WUE 日变化在轻度和中度胁迫下均呈双峰曲线,这既与元宝枫自身生理特性有关,同时也受控于气温、光
2、强、相对湿度及蒸腾速率的日变化。1oM:元宝枫;光合速率;蒸腾速率;水分利用效率ms|:S718.43DSM:A cI|:1001-7461(2003)02-0001-03PhotosyntheticCharacters and Water Utilization Efficiency in Acer truncatumUnder Water StressWEN Jian-lei1 , LIU Zhi-long2 , WANGShu-qing1(1.Collegeof LifeSciences, NWSci-TechUniv .of Agr.andFor., Yangling, Shaanxi
3、, 712100, China;2.Teast Farm , NWSci-TechUniv .of Agr.andFor., Yangling, Shaanxi, 712100, China)Abstract:Photosynthetic characters and water utilization efficiency (WUE)in Acer truncatum under waterstress were studied with one-year-old pot-cultured grafting seedlings.The results showed that the net
4、photosyn-thetic rate(Pn)and WUE decreased along with thelengthening and deepening of waterstress.Under light andmoderate water stress, decrease of Pn was arisen from both stomatalimitation and nonstomata limitation.Whileunder severe water stress, decrease of Pn was mainly arisen from non-stomata lim
5、itation.Under light waterstress, diurnal change of Pn was a single peak curve, and under moderate water stress, diurnal change of Pnwas double peak curve.Diurnal change of WUE was adouble peak curve underlight and moderate water stress.Key words:Acer truncatum ;photosynthetic rate;transpiration rate
6、;water utilization rate(Acer truncatum)S=D!,1s、/8,s/1,7O6N 1 。M,vLlV,l,y7?B;T。ssH(SWC20%5%,=-0.4 MPa-4.1 MPa), RsCs?3AM,Vd1l。/(SWC20%10%,=-0.4 MPa-4.1 MPa),Pn21.2%,VC0l;+,BVFl? 5 。s/,;qMCwL;WUEMs/,(wL,;1&3+1,H9se、;、MA#-qM。ID: 1 ,9X,b.7? M .:S/,1996.77-116. 2 SSZ3.C3L2 M .:S,1999.55-56 3 EuI.rjsm M .:j,1988.203-204. 4 Bierhuizen J F, Slatyer R O.Effect of atmospherie concentrationof water vapor and CO2in determing transpiration of cotton leaves J .Agric.Meteorol., 1965(2):256-270. 5 $:,y,.la J .,1999,14(2):1-6.32ysHq/;+#srq
