茭白地上部N、P、K含量及变化趋势

Content and Change Trend of N,P,K in Above-ground Organs of Zizania latifolia

茭白植株地上部总体上N、K含量较高 ,P含量低。干物质中P、K含量的变化总体呈下降趋势 ,N的含量在孕茭膨大期有一个激增过程。叶片和短缩茎N、P、K的含量变化与植株N、P、K含量变化基本一致。肉质茎膨大过程中N、P、K含量均显著增加 ,叶片和短缩茎的N、P、K含量有不同程度的下降。叶片制造的养分首先送往短缩茎 ,短缩茎积累达一定程度而肉质茎尚未膨大时 ,叶片进行自身积累 ,肉质茎开始膨大后 。

The gross N,K contents in above ground organs of Zizania latifolia were relatively high while P content low. Contents of P,K in dry matter basically decreased, but that of N increased dramatically during the pregnant period. Meanwhile, contents of N,P,K in leaves and culms were basically the same of those of the whole plant. Contents of the N,P,K in zizania gall all greatly increased, but those in leaves and culms relatively decreased at different levels. Nutrition produced in leaves was firstly transported to culms. There was accumulation of nutrition in leaves during the period when the culm developed to a certain extent while the zizania gall hadn’t expanded. Nutrition in the culm was transported into the gall after it began to expand.