Type and rate of fertilizer influence the level of organic carbon and total nitrogen in theudsoil markedly, but the effect on different pools is open to question. Soil samples wereudtaken from a sandy Cambisol at Darmstadt, Germany, after 27 years of differentudfertilization treatments. The six treatments were: straw incorporation plus applicationudof mineral fertilizer (MSI) and application of farmyard manure (FYM) each at high (140ud– 150 kg N ha-1 year-1), medium (100 kg N ha-1 year-1) and low (50 – 60 kg N ha-1udyear-1) rates. After 266 days of incubation (10°C, 50% water-filled pore space)udmineralization of C (1130 – 1820 kg ha-1) and N (90 – 125 kg ha-1) depended on theudrate and not on the type of fertilizer. Very labile and labile pools were obtained byudfitting a two-pool model on the mineralization data. The very labile pool (turnover: 17uddays, C/N ratio: 23) was unaffected by treatments. Storage of C (1.8 – 3.2 t ha-1) in theudlabile pool (turnover 462 days, C/N ratio: 22) increased significantly with the rate ofudfertilizer. The size of the intermediate pool was significantly higher in FYM (15 -18 tudha-1) than in MSI treatments (12- 14 t ha-1). A passive pool, obtained by oxidation withudNa2S2O8, was independent of treatments. Our study shows that labile andudintermediate pools were affected differently by fertilization.
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机译：肥料的类型和比例对土壤中有机碳和总氮的含量有显着影响，但对不同库的影响值得商question。经过27年的不同施肥处理后，从德国达姆施塔特的沙质Cambisol采集了土壤样品。六种处理方法分别为：秸秆并用，无机肥料施用量（MSI）和高（140 ud–150 kg N ha-1 year-1），中度（100 kg N ha-）施用农家肥（FYM）。 1年1）和低（50-60 kg N ha-1 udyear-1）比率。孵育266天（10°C，50％充满水的孔隙空间）后，C（1130 – 1820 kg ha-1）和N（90 – 125 kg ha-1）的脱矿质取决于 udrate而不是肥料的类型。通过在矿化数据上拟合两池模型获得非常不稳定和不稳定的池。极不稳定的池（周转：17天/天，C / N比：23）不受处理的影响。不稳定池中碳的储存量（1.8 – 3.2 t ha-1）（周转期462天，碳氮比：22）随肥料用量的增加而显着增加。 FYM（15 -18 t udha-1）中的中间库大小显着高于MSI处理（12-14 t ha-1）。通过用 udNa2S2O8氧化获得的被动池与处理无关。我们的研究表明，不稳定的和中等的池受肥的影响不同。
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