摘要
以川梨(Pyrus pashiaBuch.Ham.)、滇梨(Pyrus pseudopashiaYu)、杜梨(Pyrus betulaefoliaBge.)和砂梨(Pyrus pyrifoliaNa-kai)为材料,研究了梨属4个种的光合速率、光饱和点、光补偿点、光合速率和蒸腾速率的日变化规律、水分利用率(WUE)及日变化规律。结果表明,梨属4个种的光合速率、光饱和点和光补偿点存在差异,光合速率强弱顺序为川梨>滇梨>杜梨>砂梨。杜梨的光饱和点和光补偿点最高。供试的梨属4个种在晴天光合速率的日变化均呈双峰曲线,中午有明显的“午休”现象;蒸腾速率日变化呈单峰曲线。水分利用效率强弱的顺序为杜梨>滇梨>川梨>砂梨。
The Photosynthetic rate （ Pn）, the light compensation points （ LCP ）, the light saturation points （ LSP）, the transpiration （ Tr）, the water utilization efficiency（WUE） and the diurnal changes of Pn, Tr, WUE were study on Pyrus pashia Buch. Ham. , Pyrus pseudopashia Yu, Pyrus betulaefolia Bge. ,Pyrus pydfolla Nakal. The results showed that there are different of Pn, LCP, LSP of four pear,its order of Pn from high to low is as follows ： P. pashia Buch. Ham. 〉 P. eudopashia Yu 〉 P. betulaefolia Bge. 〉 P. pyrlfolia Nakai. In four pear, the LCP and the LSP of P. betulaefolia Bge. is higher than that of other three pears. Diurnal changes of Pn, WUE showed similar patterns of double peak curve and obvious ＂midday-rest＂in four pear on clear days. Diurnal changes of Tr appeared single peak. The order of WUE from high to low is as follows ： P. betulaefolia Bge. 〉 P. pseudopashia Yu 〉 P. pashia Buch. Ham. 〉 P. pyrifolia Nakal.
出处
《西南农业学报》
CSCD
2006年第6期1144-1146,共3页
Southwest China Journal of Agricultural Sciences
基金
贵州省教育厅自然科学基金资助项目(项目编号:95099D-37)
关键词
梨属植物
砧木
光合特性
水分利用率
plant of Pyrus
rootstock
photosynthetic characteva
water utilization
