养分含量对闽楠苗木生长的影响

Effect of Nutrition Element Content on Seedling Growing of Phoebe bournei

试验结果表明,闽楠苗木根、茎及叶中的N、P、K和Ca的含量存在着显著差异,其中叶片中各种元素的含量最多。如果土壤中N、P含量太低将导致闽楠苗木的吸收量不足而使苗木生长较差,当土壤中的养分含量达到一定量时,特别是全N、速效P的含量分别达到0.1%和20.3×10-6时,就能满足闽楠苗木生长的需要,且苗木的吸收量不随土壤中养分含量的变化而变化。在闽楠苗木的年生长期中,苗木的N、P、K和Mg的含量随着时间的变化而变化,一般是6月份最高,以后逐渐下降,秋季再出现一次高峰。

The result of test showed that the content of N, P, K and Ca in root, stem and leaf of Phoebe bournei seedling was different, and the leaf contained the most. If the content of N and P was not enough in soil, the seedling did not absorb enough nutrition to meet the demand for growing. When the nutrition elements in soil was enough, especially when the content of complete N is 0.1% and quick-acting P is 20.3×10^(-6), the seedling can grow normally, and the content of nutrition elements that seedling absorbed from soil did not change. During a year, the content of N, P, K and Mg in the seedling changed depending on the time. Generally, it is the most on June, then it fell gradually, but in autumn another peak is reached.