盾叶薯蓣主要营养元素含量及其动态的研究

通过对盾叶薯蓣不同发育时期(花前、花期及花后)、不同叶片( 功能叶和幼叶)的 N, P, K, Zn, Fe, Cu, Mn, Mg等营养元素含量的测定分析,揭示了盾叶薯蓣营养元素的分布及动态规律.结果表明所测营养元素的动态变化可分为4种类型. a. 功能叶的 Zn, Cu 的含量,功能叶和幼叶的Mg和P含量从花前、花期至花后逐渐减少; b. 幼叶的 Zn 含量, 功能叶和幼叶的Fe, K 含量,幼叶的Mn 含量,表现出花前最高、 花后次之、 花期最少的动态; c. 幼叶的Cu 含量及功能叶的Mn 含量表现出在花后最高、 花前次之、 花期最低的变化规律; d. N 的含量, 无论在功能叶、 还是在幼叶中,都是花期最高、 花前次之、花后最低.营养元素的动态变化可作为植物对营养需求的指标,可作为在不同阶段确定施肥量的依据.

Studies on the Contents of Main Nutrient Elements and Their Dynamics in Dioscorea zingiberensis

In this paper, the contents of main nutrient elements (N, P, K, Cu, Zn, Mn, Mg, and Fe) in Dioscorea zingiberensis in different development stage are reported. The experimental results showed that the nutrient contents (NC) in different leaves change with the developmental stage of the plant and the element. a. NCs>NCfl>NCfr (NCs,NCfl and NCfr mean the content of nutrient element of leaf in seedling stage,florescence stage and fruit stage respectively) The contents Zn and Cu mature leaves, the Mg and P contents in mature and young leaves of D.zingiberensis expressed above low. b. NCs>NCfr>NCfl The Zn contents of young leaves, K and Fe contents of mature and young leaves, the Mn content of young leaves belong to this category. c. NCfr>NCs>NCfl The dynamics of the Cu content of young leaves, the Mn content in mature leaves belong to this category. d. NCfl>NCs>NCfr The dynamics of the N contents of mature and young leaves belong to this category.