Kinetic Parameters of Gross N Mineralization of Peat Soils as Related to the Composition of Soil Organic Matter
Kinetic Parameters of Gross N Mineralization of Peat Soils as Related to the Composition of Soil Organic Matter
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DOI：
10.1111/j.1747-0765.2005.tb00013.x
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发表时间：
2005-02
影响因子：
2
通讯作者：
B. Purwanto;A. Watanabe;J. Shoon;K. Kakuda;H. Ando
中科院分区：
文献类型：
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作者：
B. Purwanto;A. Watanabe;J. Shoon;K. Kakuda;H. Ando
泥炭地被认为是农业发展的替代土地类型，特别是在热带地区。在本研究中，对泥炭土的供氮能力进行了检查，这是作物生产方面最重要的土壤特性之一。从印度尼西亚、马来西亚和日本采集了十个泥炭土样品。使用零级模型估算土壤样品中的总氮矿化量，并使用简单类型模型确定矿化动力学参数。使用 13C CPMAS NMR 研究土壤有机质组成。矿化潜力（N 0）、表观活化能（E a）和矿化速率常数（k）分别在571–2,445 mg kg−1、281–8,181 J mol−1 和0.009–0.020 d−1 之间。虽然没有一个参数与土壤C/N比表现出显着的相关性，但通过13C CPMAS NMR估计，k值与总C中烷基C的比例与O-烷基C的比例之间存在负相关。后者表明，在相对富含包括碳水化合物在内的易分解有机物的泥炭土中，k 值较高。
Peat land has been considered as an alternative type of land for agricultural development especially in the tropics. In the present study, the N-supplying capacity, one of the most important soil properties in terms of crop production, of peat soils was examined. Ten peat soil samples were collected from Indonesia, Malaysia, and Japan. Gross N mineralization in the soil samples was estimated using a zero-order model, and kinetic parameters of mineralization were determined using a simple type model. Soil organic matter composition was investigated using 13C CPMAS NMR. Mineralization potential (N 0), apparent activation energy (E a), and mineralization rate constant (k) ranged between 571–2,445 mg kg−1, 281–8,181 J mol−1, and 0.009–0.020 d−1, respectively. Although none of the parameters showed a significant correlation with the soil C/N ratio, a negative correlation was observed between the k value and the ratio of the proportion of alkyl C in total C to that of O-alkyl C estimated by 13C CPMAS NMR. The latter suggested that the k values were higher in the peat soils relatively rich in readily decomposable organic matter including carbohydrates.