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Sulphur mineralization kinetics of cattle manure and green waste compost in soils

机译：牛粪和绿色废物堆肥在土壤中的硫矿化动力学

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摘要

Sulphur mineralization of cattle manure (CM) and green waste compost (GWC) added to six agricultural soils with different chemical properties was monitored over 10 weeks in a laboratory incubation experiment. Although the amount of sulphur was higher in CM than in GWC, the cumulative SO_4~(2-)-S values in GWC-treated soils were higher than in soil amended with CM. The percentages of mineralized S were always higher in GWC-treated soil (in the range 1.3-8.5 percent) than in CM-treated soil (in the range 0.9-3.8 percent). In three of the six soils, particularly for CM, an immobilization of sulphur was observed. Three kinetic models were evaluated for their suitability to describe the mineralization process. The first-order model best described S mineralization for both amended and control soils. The GWC substantially increased the amount of potentially mineralizable S (S_0) relative to the controls. In GWC-treated soils, the rates of S mineralization (kappa) were higher than rates in the controls. The kappa of CM-amended soils was often lower than the k of control soils. Parameters derived from the model were tested as indices for assessing the relationships between S mineralization and soil characteristics. The S_0 was positively correlated to the amount of cumulative SO_4~(2-)-S and also to the content of organic C, N and S in soil.
机译：在实验室培养实验中，对10种不同化学性质的农业土壤中添加的牛粪（CM）和绿色废料堆肥（GWC）的硫矿化进行了监测。尽管CM中的硫含量高于GWC，但GWC处理过的土壤中的累积SO_4〜（2-）-S值高于CM改性的土壤。在GWC处理过的土壤中（1.3-8.5％范围内）矿化的S的百分比始终高于CM处理过的土壤（0.9-3.8％范围内）。在六个土壤中的三个中，特别是对于CM，观察到了硫的固定化。评估了三种动力学模型对描述矿化过程的适用性。一阶模型最好地描述了改良土壤和对照土壤的S矿化作用。相对于对照，GWC实质上增加了潜在矿化的S（S_0）的量。在经过GWC处理的土壤中，S矿化（κ）的速率高于对照组。 CM改良土壤的kappa通常低于对照土壤的k。测试了来自模型的参数，作为评估S矿化与土壤特性之间关系的指标。 S_0与土壤中SO_4〜（2-）-S的累积量呈正相关，与土壤中有机碳，氮和硫的含量呈正相关。

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