不同程度中碱性复合盐对向日葵生长的影响

模拟天然盐碱生态条件，将ＮａＣｌ、Ｎａ２ＳＯ４、ＮａＨＣＯ２和Ｎａ２ＣＯ３等４种盐按不同比例混合成３０种盐碱强度各不相同的混合盐溶液（浓度为５０－２５０ｍｍｏｌ／Ｌ，ｐＨ值为７．１２－１０．７２），对向日葵苗进行盐碱混合胁处理。结果表明：（１）无论ＰＨ高低只要总盐浓度不超过１００ｍｏｌ／Ｌ向日葵即可全部存活，但如果总盐浓度超过１００ｍｍｏｌ／Ｌ，同时ＰＨ值高于９．７５，盐的浓度和ＰＨ值二者之中行休

The effect on growth of sunflower to mixed salts with various natural and alkaline

Sunflowers were subjected to stress with 30 kinds of sa1t mixture (density of concentration 50 ~ 250 mmol/L) which were composed of NaCl, Na2SO4, NaHCO3, and Na2CO3 in various proportion on simulated natural alkali - saline condition. The results showed that all the responded strains is as follows: (1 )Under the conditions with a salinity not more than 100 mmol/L and no matter pH for high or low, all the seedlings were able to survive, while a pH value higher than the survival rate of the seedlings would drop with an increasing of salinity or pH value. (2 )The growth were clearly restrained, and the leaves area, water contents, daily growth rate and roots vitality etc. kll droped with increasing salt concentrations and incrasing of alkaline salt proportion. The salinity was the mainly damaging factor while alkaline was low and the alkline was the mainly damaging factor whiIe alkaline was high. The stress reaction of mixed sa1t alkline stress was more seriously and more complicatedly than that of simple neutral salts or alkaline salts. The stress action was doubly effect of the last two sides.