土壤水分在提高氮肥肥效中作用机制  

Operational Mechanism of Soil Water onImproving Nitrogen Efficiency

作　　者：王喜庆[1,2] 李生秀 高亚军 

机构地区：[1]西北农业大学基础科学系 [2]资源与环境科学系

出　　处：《西北农业大学学报》1997年第1期15-19,共5页Journal of Northwest Sci-Tech University of Agriculture and Forestry（Natural Science Edition)

摘　　要：采用室内模拟、盆栽、微区和田间试验相结合的方法，系统研究了土壤水分在提高氮肥肥效中的作用机制。结果表明：①在一定土壤水分含量范围内，随土壤含水量增加ＮＨ＋４—Ｎ硝化速率增加；②在根系不干扰土体养分的情况下，较高的土壤含水量可加快肥料氮向根系迁移；③良好的土壤水分有利于植物吸收氮素；④水分能促使氮素向籽粒转移，改善籽粒对茎叶的比值，从而增加了玉米的经济学产量，最终反映为土壤水分增高可提高氮肥的增产效果。Incubation experiment,pot experiment,micro plot experiment and field experiment were conducted in order to study systematically operational mechanism of siol water on improving nitrogen efficiency.The result showed as follows:① the NH + 4—N nitrification rate increased with the soil water content rise in a given range;② the higher soil water content contributed to the transport of fertilizer—N with out interfering the soil nutrient distribution of root system;③ sufficient soil water benefited the nutrients uptake by shoots;④ the soil water condition could improve harvest index,finally the soil water content could result in the increase of N efficiency.

关 键 词：土壤水分 氮肥肥效 春玉米 

分 类 号：S152.75[农业科学—土壤学] S143.1[农业科学—农业基础科学]