施N量对兰竹荔枝氨基酸含量和花性的影响

以２２年生兰竹荔枝为试验材料，设４个施Ｎ水平（ｋｇ株－１）：Ｎ１０．２５，Ｎ２０．５，Ｎ３０．８，Ｎ４１．２．试验结果表明：Ｎ１至Ｎ３处理内，随着施Ｎ量的增加氨基酸含量也增加，而Ｎ４处理氨基酸含量反而降低．施Ｎ量对各种氨基酸含量也有影响，但表现不一样．随着施Ｎ量增加含量升高的有缬氨酸、苯丙氨酸；丝氨酸、酪氨酸和组氨酸，以Ｎ２处理的含量最高；其余的各种氨基酸都以Ｎ３处理的含量最高，Ｎ４处理的含量反而降低．各种氨基酸与施Ｎ量的相关性都不显著；施Ｎ量与总花量和雄花量呈显著正相关，与雌花／总花量比值呈极显著负相关．各种氨基酸中，缬氨酸、苯丙氨酸和精氨酸与总花量呈显著正相关，其余的相关性不显著．各种氨基酸与雌花量的相关性也不显著．

Effects of the levels of nitrogen application on the amino acid contents and flower sex of Lanzhu litchi

Twenty two years old Lanzhu litchi was used as test material and four levels of nitrogen application were designed including 0.25, 0.5, 0.8 and 1.2 kg per plant in the treatments N 1, N 2, N 3 and N 4. The results indicated that along with the increase of nitrogen application the total content of amino acids increased in the treatments N 1, N 2 and N 3 but decreased in the treatment N 4. The effects of the levels of nitrogen application on the contents of different amino acids were various. The contents of valine, phenylalanine, serine, tyrosine and histidine increased along with raising of the levels of nitrogen application, and reached the highest in the treatment N 2, the contents of the other amino acids reached the peak in the treatment N 3 but decreased in the treatment N 4. Different amino acids were insignificantly correlated to the levels of nitrogen application and to female flower quantity but valine, phenylalanine and arginine were significantly positively correlated to total flower quantity. The levels of nitrogen application were significantly positively correlated to total and male flower quantities but extremely significantly negatively to the ratio of female/total flower quantity.