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本文报道实验室培养条件下红壤添加黑麦草后生物量态氮和矿质氮的消长动态及其相互关系。结果表明：（１）添加黑麦草后，红砂土和黄筋泥中的生物量态氮分别在８、２１、６０天和８、２１、４８天时出现高峰；而经７２天培养后，生物量态氮含量基本不变，并维持较低水平。（２）除黑麦草加入后３０～６０天外，其余培养时间里生物量态氮的消长趋势红砂土与黄筋泥相似。（３）加入黑麦草５天后，两种红壤中的矿质氮含量均开始明显增加。红砂土中的矿质氮含量在培养２０天时达到最大值，随后矿质氮含量呈下降趋势。黄筋泥中的矿质氮含量在培养３０天时达到最大值，在随后的３０～９０天内基本不变，９０天后矿质氮略有下降。（４）在两种红壤中添加黑麦草后，其矿质氮含量的变化存在差异。（５）培养初期的１８天内，生物量态氮的消长与有机氮的矿化关系密切。
This paper reports the dynamics and correlation of biomass nitrogen and mineral nitrogen in red soil after adding ryegrass under laboratory culture conditions. The results showed that: (1) After adding ryegrass, the biomass nitrogen in red sand soil and yellow gluten mud peaked at 8,21,60 days and 8,21,48 days, respectively. After 72 days, the biomass The amount of nitrogen content basically unchanged, and maintain a low level. (2) In addition to the ryegrass joined 30 to 60 days after the outside, the rest of the incubation time trends in the growth and decline of biomass nitrogen red sand soil and yellow tendon mud similar. (3) After 5 days of adding ryegrass, mineral nitrogen content in both red soils began to increase obviously. The content of mineral nitrogen in red sandy soil reached the maximum value after 20 days of cultivation, and then the mineral nitrogen content showed a downward trend. The content of mineral nitrogen in Huangjin mud reached the maximum value at 30 days of culture, remained basically unchanged in the next 30 ~ 90 days, and decreased slightly after 90 days. (4) There were differences in the changes of mineral nitrogen content after adding ryegrass in two red soils. (5) During the first 18 days of cultivation, the growth and decline of biomass nitrogen was closely related to the mineralization of organic nitrogen.