Interactive effects of crop residue quality and nitrogen fertilization on soil organic carbon priming in agricultural soils
Interactive effects of crop residue quality and nitrogen fertilization on soil organic carbon priming in agricultural soils
复制标题
DOI：
10.1007/s11368-020-02797-8
复制
发表时间：
2020-10
影响因子：
3.6
通讯作者：
Q. Ma;Tetsuhiro Watanabe;Jinsen Zheng;Shinya Funakawa
中科院分区：
文献类型：
--
作者：
Q. Ma;Tetsuhiro Watanabe;Jinsen Zheng;Shinya Funakawa
目的土壤有机碳（SOC）启动影响土壤固碳，其强度因残留物质量而异。施氮也可以改变土壤有机碳的启动。然而，秸秆品质和氮肥对土壤有机碳启动的交互作用尚不清楚。为了解决这一差距的知识，我们进行了这项study.Materials和methodsWe进行了110天的实验室培养实验，以评估SOC引发和螯合诱导的玉米芽和根残留物与和不施加矿物肥料-N在两种类型的农业土壤（Andisol和红壤）。玉米秸秆和氮肥的施用量分别为3 g C kg− 1 soil和60 mg N kg− 1 soil。13 C标记的玉米秸秆可以量化残留物的分解并计算SOC启动和封存。施氮对两种土壤根、茎残体引发效应的影响不同;根残体降低了引发效应的强度，由于减少了N的开采，导致了更高的净C固定，而枝残体的影响不大，结论秸秆质量和施氮量对土壤有机碳启动有交互作用。当土壤用低质量的作物残留物处理时，施氮有利于土壤固碳（例如，根残体），因为引发效应强度降低和作物残体分解。
PurposeSoil organic carbon (SOC) priming affects C sequestration in soils, the intensity of which differs depending on residue quality. N fertilization could also alter SOC priming. However, the interaction of crop residue quality and N fertilization on the SOC priming is still not clear. To address this gap in knowledge, we conducted this study.Materials and methodsWe undertook a 110-day laboratory incubation experiment to evaluate the SOC priming and sequestration induced by maize shoot and root residues with and without the application of mineral fertilizer-N in two types of agricultural soils (Andisol and Entisol). Application rates of maize residue and N were 3 g C kg−1soil and 60 mg N kg−1soil, respectively.13C-labeled maize residue allowed quantifying residue decomposition and calculating SOC priming and sequestration.Results and discussionAfter 110 days of incubation, the cumulative intensity of priming effect was higher for root residue than shoot residue. Addition of N results in contrasting effects on the priming effect induced by root and shoot residue in both types of soils; with root residue, it reduced the intensity of priming effect and resulted in a higher net C sequestration because of reduced N mining, whereas it had little effect with shoot residue, where co-metabolism is the likely explanation for the positive priming effect.ConclusionCrop residue quality and N fertilization can interactively affect the SOC priming. N fertilization is beneficial for soil C sequestration when soil is treated with low-quality crop residue (e.g., root residue) because of lowering of the intensity of priming effect and crop residue decomposition.