生态环境2008，Vol.17Issue(1)：368-376,9.
利用根箱法解析水稻根际土壤中氮的行为
The Behavior of Nitrogen in the Rhizosphere of Rice Plant Using the Rhizobox System
乌尼木仁 1樗木直也 1陈能场 2稲永醇二3
作者信息
- 1. 日本鹿见岛大学农学部植物营养实验室,鹿见岛,890-0065,日本
- 2. 日本鹿见岛大学农学部植物营养实验室,鹿见岛,890-0065
- 3. 日本广东省生态环境与土壤研究所//广东省农业环境综合治理重点实验室,广东,广州,510650
- 折叠
摘要
Abstract
Behavior of N in the rhizosphere of rice (Oryza sativa L.) plant was investigated using a rhizobox system filled with a shirasu soil applied with NH415NO3 or 15NH4NO3. The rhizobox consisted of one 2-mm width center compartment(CC), five 1-mm width compartments, and one bulk compartment(BC) on both sides of CC．Rice was sowed and grown in CC. After 6th weeks after clutivation,the soil from each compartment were collected and analyzed for contents and 15N excess％ of the soil total-N,water-soluble NO3-N,NH4-N and KCl-extractable NH4-N. The obtained results were summarized as follows: 1) The total-N content of soil decreased in all the compartments except CC compared with that before cultivation,but that of CC did not change. 2) The water-soluble NO3-N content of soil decreased remarkably in all the compartments compared with that before cultivation,and about 79% of applied NO3-N was lost from soil due to denitrification. The NO3-N content of soil slightly increased from BC toward CC. The most of NO3-N were derived from the soil N especially in the CC. 3) The contents of water-soluble NH4-N and KCl-extractable NH4-N decreased from BC toward CC and the ratio of water-soluble NH4-N to KCl-extractable NH4-N are 1:10 in all the compartments except CC which water-soluble NH4-N was not detected. 4) Mineralization of soil-N and immobilizaition of fertilizer-N were more actively at CC than in the other compartments.关键词
15N/有机化/无机化/氮的行为/根箱/根际/水稻Key words
15N/Immobilization/Mineralization/N Behavior/Rice plant/Rhizobox/Rhizosphere分类
环境科学引用本文复制引用
乌尼木仁,樗木直也,陈能场,稲永醇二..利用根箱法解析水稻根际土壤中氮的行为[J].生态环境,2008,17(1):368-376,9.
