木麻黄根系浸提液对幼苗营养吸收和生长的影响

采用水培方法研究不同质量分数的15年生实生木麻黄Casuarina equisetifolia根浸液对木麻黄幼苗营养吸收、生长和根系活力的影响.结果表明,木麻黄根浸液对其幼苗吸收钙、镁、锌元素有明显抑制作用.低质量分数根浸液促进木麻黄苗木根对钾、铁的吸收和茎对钾、铁、钙、镁的积累,而高质量分数根浸液抑制苗木对钙、铁、铜、锰的吸收.木麻黄根浸液显著抑制木麻黄幼苗生长和根系活力,说明木麻黄根浸液对木麻黄幼苗产生他感作用,通过降低木麻黄苗木根系活力,减少幼苗对营养元素的吸收,进而影响木麻黄幼苗的生长.图7表1参25

Effect of water extract of Casuarina equisetifolia root on nutrient absorption and growth of the seedlings

The study of effect of water extract of Casuarina equisetifolia root on nutrient absorption, growth and root vitality of C. equisetifolia seedlings was carried out with the method of water culture. The results showed that water extract of C. equisetifolia root obviously inhibited C. equisetifolia seedlings to absorb nutritious elements of Ca, Mg and Zn. Low mass fraction of water extract of C. equisetifolia root made the root of C. equisetifolia seedlings absorb more nutritious elements of K and Fe, and the stem accumulate more nutritious elements of K, Fe, Cu and Mn. But high mass fraction of water extract of C. equisetifolia root inhibited C. equisetifolia seedlings to absorb K, Fe, Cu and Mn. Water extract of C. equisetifolia root inhibited the growth and root vitality of C. equisetifolia seedlings. It could be concluded that water extract of C. equisetifolia root could have allelopathic effects on C. equisetifolia seedlings by decreasing activity of root system, resulting in inhibition of absorbency of nutritious elements and affection of the growth of C. equisetifolia seedlings. Ch,7 fig. 1 tab. 25 ref.]