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研究室内培养条件下水稻秸秆配施化肥氮对土壤微生物生物量的形成和氮素转化的影响。８４ｍｇＮ／ｋｇ标记硫铵和４．５ｇ／ｋｇ稻草粉配施淹水培养，结果表明，有２５．８％的肥料氮在培养６３ｄ时成为生物量及其代谢产物－１５Ｎ。整个培养过程中生物量－１５Ｎ无净再矿化现象。将稻草粉换成葡萄糖淹水培养，葡萄糖在培养７ｄ时消耗贻尽，此时生物量－１５Ｎ达最大值４３．１ｍｇＮ／ｋｇ，相当于施入肥料氮的５１．３％。在此条件下，生物量－１５Ｎ有明显净再矿化现象，且净矿化出来的氮遭受损失。稻草粉处理好气培养结果表明，新形成的生物量及其代谢产物－１５Ｎ较淹水培养处理高得多，达４７．０ｍｇＮ／ｋｇ，相当于施入肥料氮的４６．３％。在此条件下，生物量－１５Ｎ亦无明显净再矿化现象。比较不同处理的氮素回收率，可以看出施入稻草粉可以减少肥料氮的损失
Effects of Combined Application of Nitrogen and Nitrogenous Fertilizers on Biomass Formation and Nitrogen Conversion of Soil Microbial Biomass in an In - situ Cultured Rice Cultivar. The results showed that 25.8% of fertilizer nitrogen became biomass and its metabolite -15N when cultured for 63 days. Throughout the cultivation of biomass -15N no net remineralization. The straw meal was replaced by glucose for flooding culture. When glucose was cultured for 7 days, glucose was exhausted. At this time, the biomass -15N reached the maximum of 43.1 mgN / kg, equivalent to 51.3% of the applied nitrogen fertilizer. Under this condition, there was a clear net remineralization of biomass -15N and net nitrogen loss. The aerobic culture of rice straw showed that the newly formed biomass and its metabolite -15N were much higher than the flooding culture, reaching 47.0mgN / kg, which was equivalent to 46.3% of the applied nitrogen fertilizer. Under this condition, there was no obvious net remineralization of biomass -15N. Comparing different treatments of nitrogen recovery, we can see that the application of straw powder can reduce the loss of fertilizer nitrogen