融雪剂胁迫对月季光合特性的影响

为了探讨融雪剂对城市绿化植物的影响,以1年生月季(Rosa chinensis)幼苗为试材,在融雪剂施用量为0、20、50、80、120g · m-25种条件下,研究了融雪剂对月季光舍特性的影响.结果表明:随着融雪剂施用量的增加和胁迫时间的延长,月季叶片净光合速率(Pn)、蒸腾速率(Tr)和气孔导度(G(0))明显下降.施用融雪剂LBR -4后,月季的水分利用效率(Wu,E)明显下降,胞间二氧化碳摩尔分数(Ci)和气孔限制值(L(O))先降后升;在施用融雪剂JLR-01后的第1周,WU,E、L(U)和Ci上升,第2周均下降;同等胁迫条件下,LBR-4对月季幼苗的影响大干JLR-01.融雪剂施用量为20g·m-2时,月季能够忍受,当融雪剂施用量＞50 g·m-2后,月季在较短时间内就表现出受害症状,且去除胁迫条件后不能恢复正常生长.融雪剂对月季幼苗的影响不仅来自氯化物,而且还受其他微量金属的影响.

Effects of Deicing Salt Stress on Photosynthetic Characteristics of Rosa chinensis

An experiment was conducted to study the effects of deicing salt stress on urban green plants.The photosynthetic characteristics of one-year-old seedlings of Rosa chinensis were determined under deicing salt stress of different concentrations(0,20,50,80,120g·m-2).Results showed that the net photosynthetic rate,transpiration rate,and stomatal conductance of the leaves of R.chinensis declined markedly with increasing deicing salt concentration and prolonged stress time.Under the stress of LBR-4 deicing salt,the water use efficiency declined markedly,and intercellular CO2 concentration and stomatal limitation decreased after an initial increase.However,under the stress of JLR-01 deicing salt,water use efficiency,stomatal limitation and intercellular CO2 concentration increased during the first week and decreased during the second week,and stomatal conductance decreased after an initial increase.Under the same stress concentration,R.chinensis were damaged by LBR-4 deicing salt more badly than by JLR-01.R.chinensis seedlings could endure threats of less than 20g·m-2 deicing salt,and they could recover after removing deicing salt.However,when R.chinensis seedlings in conditions of more than 50g·m-2,they would be destroyed in a short period of time and never restored normal growth.The effects of deicing salt on R.chinensis seedlings not only result from Cl-but also from other trace metals.