木麻黄盐害肿枝病研究

广东沿海木麻黄肿枝病经试验证明主要是由海水中的氯化钠和氯化钾直接引起的盐害。木麻黄地上部较地下部易受盐害。 沿海木麻黄病、健植株小枝的氯、钠离子含量有显著差异,病株小枝的氯、钠离子含量为健康小枝的两倍多。 土壤分析结果表明:病区土壤含盐量比健区高约一倍,水分和有机质含量比健区低约一倍。试验亦证明土壤含水量和土质对苗木盐害有显著的影响。 在测试的15个木麻黄无性系中只有1个较耐盐害。

SWELLING BRANCH OF CASUARINA CAUSED BY SALT INJURY

Experiments indicated that the assimilatory branch swelling of Casuarina in coastal areas of Guangdong province was caused by salt injury. Sodium choride and potassium chloride were the main causal agents.The underground parts of Casuarina plants were more tolerant to salt injury than the aerial parts.Chemical analysis of the assimilatory branch samples collected from the coastal plants showed that the contents of chloride ion and sodium ion in the diseased assimilatory branches were 2 times as much as in the healthy ones.Analysis of soil samples taken from the coastal areas showed that the salt injury of Casuarina trees was in relation to the salt content, the amount of organic matter, moisture , and the pH value in the site where the trees had been growing. Experiments also demonstraed the effect of the soil moisture and soil texture on the salt injury of Casuarina,A clonal variation in salt tolerance is apparent. Of 15 clones tested only one was highly tolerant.