【摘要】 通过测定珍珠绣线菊等7种园林绿化树木小枝不同水分状况下的净光合速率、蒸腾速率变化,研究不同水分状况下7树种的光合生理生态特征,探讨其对水分胁迫的适应性。结果表明:随着小枝水分亏缺程度的加大,净光合速率呈下降趋势;随着小枝水分亏缺程度的加大其蒸腾速率呈下降趋势,二者关系曲线呈"S"型。初始失膨点总体渗透势(πp)、净光合速率水势补偿点值(ψnpc)、"S"型曲线近0拐点的水势(ψrtc)可用于评价树木对水分胁迫的适应性,其值愈小对水分胁迫的适应性越强,7种园林绿化树种对水分的适应性由强到弱顺序依次为:珍珠绣线菊、金焰绣线菊、金山绣线菊、栾树、金枝国槐、金叶莸、红王子锦带。更多还原

【Abstract】 The variation of the feature of photosynthetic,eco-physiological characteristics were analyzed by menstruating the net photosynthetic rate and the transpiration rate under different water potentials of the branch lets of the seven trees.The results indicated:(1)The net photosynthetic rate and the transpiration decreased with the increased saturated deficit of the branch.The relative curve between them was showed as "S".(2)The osmotic potential of the initial loss point of the turgor,the water potential compensation point of the net photosynthetic rate and the water potential point of "S"curse approximating to 0 could evaluate the tree’s adaptability to water stress,the values of them were small,the tree’s adaptability was stronger,the order of water adaptability(from strong to weak) was Spiraea thunbergii > Spiraea×bumalda ’Gold Flame’ > Spiraea×bumalda’Gold Mound’ > Koelreuteria paniculata > Sophora japonica’Golden stem’ > Caryopteris ×clandonensis’Worcester Gold’ > and Weigela florida ’Red Prince’.更多还原