缺素对高州油茶幼苗生长的影响

Effects of Nutrient Deficiencies on the Growth of Camellia gauchowensis Seedlings

试验设置全素(control)、缺氮(-N)、缺磷(-P)、缺钾(-K)、缺钙(-Ca)、缺镁(-Mg)、缺硫(-S)7个处理,对高州油茶幼苗进行缺素施肥试验,通过测定苗高、地径、叶面积、叶片周长、叶片长宽比等指标,探究不同缺素处理对高州油茶苗期生长的影响。结果表明:(1)除缺Mg处理各项指标与对照相当外,各缺素处理下高州油茶幼苗的地径和苗高均低于对照,缺素抑制了高州油茶幼苗径高的生长,其中主要影响元素为N、K、Ca。(2)对高州油茶幼苗叶片生长影响较大的元素为Ca和K,但各项指标差异不显著(P>0.05),缺N、缺P、缺Mg、缺S处理下的高州油茶幼苗各项指标与对照无明显差异。缺素对高州油茶幼苗叶面积、叶片周长、叶片长宽比和叶片干重的影响不显著,其原因有待进一步探讨。

An nutrient deficiencies fertilization experiment was conducted with seven treatments （control treatment, N, P, K, Ca, Mg and S deficient treatments）. Growth indices （height growth, ground diameter, leaf area, leaf perimeter and leaf length/width ratio） were measured to study the effects of different nutrient deficiency on the growth of Camellia gauchowensis seedlings. It was indicated that： （1） height growth and ground diameter of all deficient treatments except Mg deficient treatment were lower than that of the deficiency inhibited the growth of height and ground diameter, the main factors were K, Ca and Mg. control, （2） The elements which had greater impact on leaf growth of Camellia gauchowensis seedlings were Ca and Mg, but there was no significant difference among the indicators. Indicators of N, P, Mg, S deficient treatments were not significantly different from the control（P〉0.05）. Nutrient deficiencies had no significant effect on height growth, ground diameter, leaf area, leaf perimeter and leaf length/width ratio of Camellia gauchowensis seedlings .