楝树籽提取物对土壤供氮和氮肥利用率的影响

摘要/Abstract

摘要： 研究了楝树籽不同方式的提取物(NⅠ,NⅡ)对普通铁质淋溶土壤、简育水耕人为土壤供N和N肥利用率的影响.NⅠ可在一定程度上抑制这两种土壤产生NO₃-N,NⅡ在两种土壤上前期均能显著固定NH₄⁺-N,并在后期释放出NH₄⁺-N.如果NⅠ和NⅡ2种提取物同时与化肥N施入土壤,则可明显改善土壤的供N状况,使之与作物需N过程更吻合.盆栽实验证明,NⅡ可显著提高肥熟旱耕人为土壤上作物对N肥的利用率.

关键词: 楝树籽提取物, 固定, 矿化, N肥利用率, 随机森林, 国家森林资源清查, 生物量转换和扩展因子, 增强回归树, 立体派模型

Abstract: Incubation test and pot experiments were conducted with haplic luvisols and hydragric anthrosols to study the effects of neem seed extracts (NⅠ, NⅡ) on nitrification and immobilization of ammonium sulfate. NⅠ could significantly inhibit the nitrification of Napplied to the two soils. NⅡ was effective in promoting the immobilization of NH₄⁺-N. Pot experiments showed that NⅡ could increase the use efficiency of chemical nitrogen significantly in fimic anthrosols.

Key words: biomass conversion and expansion factors., Cubist model, random forest, boosted regression trees, national forest inventory

中图分类号:

S158.5

张晓晓, 沈其荣, 谈建康, 茆泽圣. 楝树籽提取物对土壤供氮和氮肥利用率的影响[J]. 应用生态学报, 2002, (11): 1417-1420.

ZHANG Xiaoxiao, SHEN Qirong, TAN Jiankang, MAO Zesheng . [J]. Chinese Journal of Applied Ecology, 2002, (11): 1417-1420.

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