Changes in carbon (C) and nitrogen (N) reserves reflect the impacts of land use and management. The objective was to evaluate the changes in organic matter stocks and quality in an Oxisol under intensive vegetable cultivation in the Brazilian Cerrado region. Four areas were selected: one under Cerrado vegetation (CV) and three under vegetable production with 15 (VG₁₅), 20 (VG₂₀) and 30 (VG₃₀) years of cultivation. Soil samples were collected for the determination of total C (TC) and total N (TN) in soil organic matter fractions and the biochemical composition of particulate organic matter (POM) and mineral-associated organic matter (MOM). The smallest C stocks were observed on VG₃₀, whereas the CV area had the highest values. The TN stocks were similar across treatments. The levels of labile C decreased with cultivation time. Increases and reductions in carbohydrate and lignin ratios in POM and MOM occurred in VG₁₅ and VG₂₀, respectively, with POM being more sensitive to changes in land use. There was greater similarity between VG₁₅ and VG₂₀, but differences between CV and VG₃₀. There was a correlation between higher labile reserves (labile C and carbohydrates) and areas with shorter land use and between C_mic and agricultural use for 30 years. There was also a negative correlation between soil nutrients and the total and MOM C and N contents as well as the MOM carbohydrate levels, and there was also a negative correlation between C_mic and TC. The intensive use of Oxisols promoted a reduction in soil organic matter stocks and altered their quality.

碳（C）和氮（N）储量的变化反映了土地使用和管理的影响。目的是评估在巴西塞拉多地区进行密集蔬菜栽培后，Oxisol的有机质储量和质量的变化。选择了四个区域：一个在塞拉多植被（CV）下进行，三个在蔬菜生产下进行了15年（VG ₁₅），20（VG ₂₀）和30（VG ₃₀）年的种植。收集土壤样品，以确定土壤有机质中的总碳（TC）和总氮（TN）以及颗粒有机物（POM）和矿物相关有机物（MOM）的生化组成。在VG ₃₀上观察到最小的C储量，而CV区域的值最高。各处理之间的TN库存相似。不稳定C的含量随培养时间的延长而降低。VG ₁₅和VG ₂₀中分别发生了POM和MOM中碳水化合物和木质素比率的增加和减少，而POM对土地利用的变化更加敏感。VG ₁₅和VG ₂₀之间的相似度更高，而CV和VG ₃₀之间的差异更大。有更短的土地使用和C之间的较高不稳定储量（不稳定C和碳水化合物）和区域之间的相关性_的麦克风和农业使用了30年。土壤养分与总和MOM中的C和N含量以及MOM中的碳水化合物含量也呈负相关，而C _mic和TC之间也呈负相关。大量使用Oxisol可以减少土壤有机质，并改变其质量。