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Exploring Temperature-Related Effects in Catch Crop Net N Mineralization Outside of First-Order Kinetics

机译：在一阶动力学之外探讨捕获作物净矿化的温度相关效果

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Catch crops are an effective method for reducing nitrogen (N) leaching in agriculture, but the mineralization of incorporated catch crop residue N is difficult to predict and model. We conducted a five-month incubation experiment using fresh residue from three catch crops (hairy vetch, fodder radish and ryegrass) with three temperature treatments (2 °C, 15 °C and 2–15 °C variable temperature) and two termination methods (glyphosate and untreated). Mineral N (ammonium and nitrate) in soil was quantified at 0, 1, 2, 4, 8 and 20 weeks of incubation. Ammonium accumulation from residue decomposition showed a lag at low and variable temperature, but subsequent nitrification of the ammonium did not. Mineral N accumulation over time changed from exponential to sigmoidal mode at low and variable temperature. Incubation temperature significantly affected mineralization rates in a first-order kinetics (FOK) model, while plant type and termination method did not. Plant type alone had a significant effect on the final mineralized fraction of added catch crop N. FOK models modified to accommodate an initial lag were fitted to the incubation results and produced better goodness-of-fit statistics than simple FOK. We suggest that initial lags in residue decomposition should be investigated for the benefit of mineralization predictions in cropping models.
机译：捕获作物是减少农业浸出氮（N）浸出的有效方法，但是掺入的捕获作物残留物N的矿化难以预测和模型。我们使用三个捕捞作物（毛茸茸的瓶子，饲料萝卜和黑麦草）进行了五个月的孵化实验，具有三个温度处理（2°C，15°C和2-15°C可变温度）和两个终止方法（草甘膦和未经治疗）。在孵育的0,1,2,4,8和20周定量土壤中的矿物N（铵和硝酸盐）。残留物分解的铵积累显示出低可变温度和可变温度的滞后，但随后的铵的硝化含量没有。矿物N随着时间的推移而累积从低于和可变温度的指数变为Sigmoid模式。孵化温度在一阶动力学（FOK）模型中显着影响矿化率，而植物类型和终止方法则没有。仅植物类型对加入的捕获作物N. Fok模型的最终矿化分数进行了显着影响，修改以适应初始滞后，延迟孵化结果，并产生比简单的Fok更好的统计统计数据。我们建议应调查残留分解中的初始滞后，以便在裁剪模型中的矿化预测的益处。

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