春季柑橘叶片对红壤水分调节的响应

Effects of Soil Moistures on Orange(Citrus unshiu Marc.)Leaf in Spring

通过调节红壤含水量不同的层次水平,研究了土壤相对含水量(SWC)对春季柑橘叶长、叶宽、叶梢长的影响,并比较了在SWC处理下柑橘叶片与根系氮、磷、钾含量变化及特点。结果表明,SWC在75%左右,最适柑橘叶片的生长。氮素在叶与根系中差别不大,但叶磷、钾含量远低于根系磷、钾含量;适当缺水有利于柑橘叶中氮素的积累,柑橘叶中磷含量与SWC呈显著正相关,而各SWC处理间柑橘叶片钾含量没有差异。

The leaf length, the leaf width and the shoot length were studied under five moisture treatments which were SWC30, SWC45, SWC60, SWC75 and SWC90 treatment of red soil in Spring. The characteristics and content change of N, P and K element in leaves and roots of orange were also compared under those soil water treatments. The result was showed that it was better for leaf growth of orange when soil water treatment was about 75 %. There was no difference for N in leaves and roots. But the contents of P and K in leaves were less than that in roots. The appropriate water shortage was advantageous to N cumulation for orange. The content of P in orange leaves had a positively significant correlation with soil relative water content（ SWC）. There was no difference for the content of K in leaves among different SWC treatments.