There is insufficient information about the dynamics of soil organic matter in integrated production systems. Therefore, we aimed to evaluate the variations in soil C and N stocks and microbial attributes as a function of the distances apart from the eucalyptus double rows within a silvopastoral system in the Brazilian Cerrado. Four treatments were considered, consisting of four distances (0.5 m, 1.6 m, 3.8 m and 6 m) apart from the double rows of eucalyptus for soil sampling within the silvopastoral system. The soil C and N contents and stocks, C/N ratio, microbial C (Cmic), soil basal respiration, metabolic quotient and microbial quotient were evaluated. Our results showed that soil C contents and stocks were significantly higher near the eucalyptus trees. Soil C stocks ranged from 99.91 (6.0 m) to 119.64 Mg ha−1 (0.5 m) up to 100 cm soil depth, with an increase of 19.73 Mg ha−1 nearest of the forest component. The same pattern was observed for N stocks, with values ranging from 9.52 (0.5 m) to 7.95 Mg ha−1 (6.0 m) and representing an increase of 1.57 Mg ha−1 near the eucalyptus. We also found an increase of 51.32% in the Cmic at 0.5 m apart from the forest component. Thus, we can infer that the presence of eucalyptus improved the soil quality within the silvopastoral system, indicating that the correct soil sampling and measurements must be performed considering all the transect cultivated with forage grass and double rows of eucalyptus.

中文翻译：

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巴西塞拉多林牧系统内土壤碳、氮和微生物属性的变化

关于综合生产系统中土壤有机质动态的信息不足。因此，我们旨在评估土壤 C 和 N 库以及微生物属性的变化，作为与巴西塞拉多林牧系统内桉树双行距离的函数。考虑了四种处理，包括四个距离（0.5 m、1.6 m、3.8 m 和 6 m），距离桉树的双行，用于在林牧系统内进行土壤采样。评价了土壤 C 和 N 含量和储量、C/N 比、微生物 C (Cmic)、土壤基础呼吸、代谢商和微生物商。我们的结果表明，桉树附近的土壤碳含量和储量显着较高。土壤碳储量范围从 99.91 (6.0 m) 到 119.64 Mg ha−1 (0.5 m) 直至 100 cm 土壤深度，增加了 19.73 Mg ha-1，最接近森林成分。对于 N 种群观察到相同的模式，数值范围从 9.52 (0.5 m) 到 7.95 Mg ha-1 (6.0 m)，并且在桉树附近增加了 1.57 Mg ha-1。我们还发现除了森林成分外，0.5 m 处的 Cmic 增加了 51.32%。因此，我们可以推断桉树的存在改善了林牧系统内的土壤质量，这表明必须考虑到所有用饲草和双行桉树种植的样带进行正确的土壤采样和测量。我们还发现除了森林成分外，0.5 m 处的 Cmic 增加了 51.32%。因此，我们可以推断桉树的存在改善了林牧系统内的土壤质量，这表明必须考虑到所有用饲草和双行桉树种植的样带进行正确的土壤采样和测量。我们还发现除了森林成分外，0.5 m 处的 Cmic 增加了 51.32%。因此，我们可以推断桉树的存在改善了林牧系统内的土壤质量，这表明必须考虑到所有用饲草和双行桉树种植的样带进行正确的土壤采样和测量。