盐胁迫下木麻黄幼树营养元素的分配规律

利用盆栽试验,研究了盐胁迫下木麻黄幼树营养元素含量和分布规律。结果表明,不同施盐量处理的木麻黄幼树生长、营养元素含量及分布发生明显的变化。低浓度(5g/kg)NaCl处理促进了木麻黄的生长,而高浓度(20、25g/kg)则抑制木麻黄的生长。随着盐浓度的增加,木麻黄根中N、P、K,茎中N、P,小枝中N含量随之增加,并与盐浓度之间呈显著正相关,而茎和小枝中的K以及小枝中的Ca含量则与盐浓度之间呈显著负相关,说明盐胁迫下木麻黄营养元素的比例失调是导致盐害的主要原因之一。盐浓度对Mg元素影响较小。

The nutrient elements distribution in Casuarina equisetifolia seedlings under salt stress

Based on pot experiments, the distribution of nutrient elements in Casuarina equisetifolia seedlings under salt stress were studied. The results showed that there were obviously effects on growth and distribution of nutrient elements in C. equisetifolia seedlings under salt stress. Low salt content (5g/kg) promoted the growth, while high salt content (20, 25g/kg) inhibited the growth. With the increase of salt content in soil, the contents of nutrient elements such as N, P, K in roots, N, P in stems and N in twigs increased, and the contents of K in stems and twigs and Ca in twigs decreased. It is suggested that the proportion maladjustment of nutrient elements is one of the causes resulted in salt damage. Salt content affected Mg content on a low level.