Integrated crop-livestock systems (ICLS) conducted under no-tillage have been shown to favour the accumulation of carbon (C) and nitrogen (N) in soil. In that systems, however, C and N accumulation in soil might depend on pasture management and the type of crop rotation used. The objective of this study was to evaluate the impact of two stocking methods (continuous and rotational) and two sheep grazing intensities (moderate and low) on winter pasture and the effect of summer crop rotation (soybean and/or maize) on crop yield and C and N stocks in an Acrisol after 14-yr under experimental conditions. The evaluated ICLS was set up for grain yield in the summer crop phase and for sheep meat production in the winter pasture phase. Pasture production, soybean and corn yield were evaluated throughout the experimental period. After 14-yr, the soil was sampled at the 0–5, 5–10, 10–20 and 20−30 cm layers to evaluate the content and stock of C and N. Higher C and N contents in soil superficial layers (0–5 and 5–10 cm) were observed under low grazing intensity in winter and soybean monoculture in summer. The C and N stocks in 0−30 cm soil layer ranged between 39 and 45 Mg C ha⁻¹ and 4 and 5 Mg N ha⁻¹, respectively. C and N stocks in the soil were significantly related to N added through the residues of pasture and summer crop. This positive relationship is possibly explained by the higher efficiency of microbes in using crop residues enriched in N with posterior stabilization of microbial residues through organo-mineral association in the soil. The higher content and stocks of C and N associated with low intensity grazing favoured a higher maize yield (40%) compared to moderate grazing intensity in the 2015/2016 season. According to our results, the accumulation of C and N in the soil under ICLS involving low grazing intensity in the winter and soybean monoculture in the summer was related to the N added/recycled by the soybean and by the hibernal pasture.

在免耕条件下进行的农作物－畜牧综合系统（ICLS）已被证明有利于土壤中碳（C）和氮（N）的积累。但是，在该系统中，土壤中的碳和氮积累可能取决于牧场管理和所使用的农作物轮作类型。这项研究的目的是评估两种放牧方式（连续和轮作）和两种放牧强度（中度和低度）对冬季牧场的影响以及夏季作物轮作（大豆和/或玉米）对作物产量和产量的影响。实验条件下14年后Acrisol中的C和N储量。针对夏季作物阶段的谷物产量和冬季牧场阶段的绵羊肉产量设置了评估的ICLS。在整个实验期间，对牧场的生产，大豆和玉米的产量进行了评估。14年后，在0–5、5–10、10–20和20–30 cm层对土壤进行采样，以评估C和N的含量和储量。土壤表层中较高的C和N含量（0–5和5–在冬季低放牧强度下观察到10 cm），在夏季大豆单作栽培。0−30 cm土壤层中的C和N储量介于39和45 Mg C ha之间^-1和4 Mg N ha ^-1。土壤中的碳和氮储量与通过牧场和夏季作物的残留添加的氮显着相关。这种积极的关系可能是由于微生物利用富含N的农作物残渣具有更高的效率，并通过土壤中的有机矿物质缔合而使微生物残渣向后稳定。与低强度放牧相关的碳和氮含量和库存较高，与2015/2016年度适度放牧强度相比，有利于较高的玉米产量（40％）。根据我们的研究结果，在冬季低放牧强度和夏季大豆单作的ICLS下土壤中C和N的积累与大豆和冬日牧草添加/循环利用的N有关。