NaCl处理对苗木及其生理指标的影响

The Effect of NaCl Treatment on Trees Physiological Index

实验选取了刺槐等6个树种为对象,研究了不同NaCl处理浓度对苗木及其生理指标的影响,结果表明:从叶部被害率的出现时间和程度来看,刺槐和杜鹃出现盐害的时间较早,其他树种较晚,处理浓度越高其盐害出现的时间就越早;随着处理时间的延长和处理浓度的提高,6个树种的单叶相对净光合速率、单叶相对蒸腾速率和单叶气孔导度的趋势几乎相同,且综合考虑这三个因素时,日本黑松的耐盐能力最强;含水率方面各树种的表现不一致,但是高浓度的NaCl处理使各树种的含水率均有降低.研究表明,各树种之间耐盐性有差异,以日本黑松的耐盐性最强.

The paper studied the effect of physiological index in different salt concentrations by using six kinds of nursery stock. It is showed that the effect of salt injury of leaf appeared earlier in acacia and cuckoo than the others, and salt injury appeared earher when salt concentration was higher. When prolonging treatment time and increasing salt concentration, the changes of relative photosynthetic rate, relative rising rate, and relative stomatal conductance are almost same in all six trees, but salt tolerance of Japan Black Pine is the best as far as the three ingredients are concerned together. The water content was different in six species, but water content of all species was reduced at higher salt concentrations. We concluded that there were differences between the six cultivars in salt tolerance and Japan Black Pine was the best.