摘要
应用１５Ｎ标记硫铵及稻草，实施了两者单施、配施的盆栽试验。结果表明：施入物料的Ｃ／Ｎ、稻草用量与稻草１５Ｎ的矿化率及吸收利用率呈反相关，与残留率呈正相关；随着施入物料Ｃ／Ｎ及稻草用量的增加，硫铵１５Ｎ的固定率及残留率相应提高，而吸收率则下降。施用占土重０．３１％～０．４６％的稻草，能提高设施土壤的全氮量。
The pot experiments with 15N-labeled ammonium sulfate and rice straw applied alone,ammonium sulfate plus rice straw applied in combination were carried out. Results showed that the C/N ratio of materials applied,the amount of rice straw were in inverse correlation to mineralization rate and utilizational rate, and in direct correlation to residual rate of rice straw-15N. With increasing of C/N ratio in the materials applied and the amount of rice straw,immobilization rate and residual rate correspondingly increased, but utilizational rate of ammonium sulfate- 15N decreased. The application of rice straw 0. 31%-0. 46% weight of soil could increase the total N of the greenhouse field.
关键词
设施土
残留氮
有机氮
无机氮
莴苣
转化
Greenhouse field
Immobilization-remineralization
Residual N
