【摘要】 1979—1980年分别在温室和苗圃条件下测定了十种杨树苗木蒸腾速率的日变化和季节变化,估算了各个品种的蒸腾耗水量。根据蒸腾速率与光合速率的比值评定了各品种对土壤水分的利用效率。此外,还测定了叶片的保水力、气孔数目以及气孔活动与水分逆境的关系。综合分析以上试验结果,按各品种耐旱与喜水程度的排列次序将十种杨树划分为五个组,供生产上参考。更多还原

【Abstract】 The water relations to annual growth in seedlings of Populus × euram-ericana(Dode)Guinier cv.Ⅰ-214,P.× euramericana(Dode)Guinier cv.Sacrau 79,P.deltoides Bartr.cv."Lux"(ex.Ⅰ-69/55),P.× euramaricana(Dode)Guinier cv."san Martino"(ex.Ⅰ-72/58),P.× nigra var.italica(M(u|¨)ench)Koehne × Cathayana Rehd,P.nigra var.italica(M(u|¨)ench)Koehne× simonii Carr.,P.simoii Carr × nigra L.,P.× Opera Hs(u|¨),P.× pupolorisHs(u|¨) and P.simoii Carr.were studied respectively under the controlledconditions both in greenhouse and field in 1979 and 1980.Special attentionwas paid to determine their diurnal and seasonal changes of transpiration rates,water consumption per hectare by calculation,water loss of excised leaves,and the ratio of transpiration to photosynthetic rates.Besides,stomatal size,frequency of distribution,and control of stomatal apertures were studied.Based on the results in the contents mentioned above,the studied species andhybrids were classified into five groups according to the capacity of theirdrought tolerance and the concerned physiological charateristics in waterrelations.更多还原