基肥氮素水平与人参碳氮代谢

Level of N as base fertilizer and C,N Metabolism for Ginseng

为探讨人参氮素营养规律，在基肥不同施氮量（０，１０，２０，３０，４０ｇ／ｍ２）条件下．采用（１４）Ｃ示踪方法和化学分析方法，测定了人参对（１４）ＣＯ２同化能力，ＮＲ活性，Ｎ、Ｐ、Ｋ营养的吸收，糖、蛋白Ｎ、非蛋白Ｎ以及人参皂甙的变化。结果表明，四龄参在基施氮肥１０ｇ／ｍ２，（１４）ＣＯ２同化能力，ＮＲ活力最高；基施氮肥３０ｇ／ｍ２时吸Ｋ量下降；基施氮肥４０ｇ时吸Ｎ量、ＮＰＮ（蛋白Ｎ）与ＰＮ（非蛋白Ｎ）、ＮＰＮ／ＰＮ值下降，Ｃ／Ｎ值下降４３％，总可溶糖、蔗糖下降，淀粉增加。五龄参时，基施氮肥４０ｇ／ｍ２处理组还原糖增加６０％左右，皂甙含量下降。

The results showed that ginseng of 4─yr─old,(14)CO2 assimilation ability, NR activity were the highest when N fertilizer as base fertilizer was 10g/m2the N absorption amount decreased when N fertilizer as base fertilizer was 30g/m2and when N fertilizer as base ferlizer was 40g/m2, N absorption amount, NPN and PN, NPN/PN decreased, C/N decreased 43%, total soluble sugar, sacrose sugar decreased, starch increased. For 5─yr─old ginseng, 40g N treatment group compared reducing sugar increased about 60% and the saponin content decreased.