In the south of Brazil, the intensification of eucalyptus planting can impact the local biome, characterized by grasslands that extends to Uruguay and Argentina. Thus, the objective of the study was to evaluate changes in soil carbon, nitrogen and their labile fractions and soil microbiological attributes due to the introduction of eucalyptus cultivation in the Pampa biome. The soils evaluated were Eutric Regosol (RG), Haplic Lixisol (LX), Dystric Leptosol (LP) and Pellic Vertisol (VR). For this, areas of homogeneous cultivation of Eucalyptus saligna (7 years old) and areas of grassland (native vegetation) were selected. Physical granulometric fractionation of soil organic matter (SOM) was performed in the 0–5, 5–10 and 10–15 cm soil layers, quantifying levels, stocks and distribution of total organic carbon (TOC) and total nitrogen (TN) in the labile and associated with minerals fractions, and the carbon management index (CMI) was calculated. In the 0–5 and 5–10 cm soil layers, microbial biomass carbon (MBC), microbial biomass nitrogen (MBN), basal soil respiration, metabolic coefficient, MBC / TOC, MBN / TN, MBC / MBN ratios were also evaluated. Eucalyptus cultivation increased the TOC and POC carbon stocks by 8.7 and 21.7%, respectively (0-15 cm) in compared to grassland. It was also observed that the cultivation of eucalyptus increased 6.7% and 26.0% the stocks of TN and PN, respectively, compared to grassland in the pampa biome. Carbon stocks associated with minerals were not affected by eucalyptus cultivation. The cultivation of eucalyptus increased the basal respiration and the microbial biomass carbon in relation to grassland and there is a reduction of microbial biomass nitrogen in the soil. Thus, the cultivation of eucalyptus in the Pampa biome in southern Brazil demonstrates that it is a forest crop that can contribute to the increase in total and labile carbon stocks and also the biomass and microbial activity of the soil, which are important indicators of assessment of soil quality.

在巴西南部，桉树种植的集约化可能影响当地的生物群落，其特征是草原延伸到乌拉圭和阿根廷。因此，该研究的目的是评估由于潘帕生物群落中引入桉树栽培而引起的土壤碳，氮及其不稳定组分和土壤微生物学特性的变化。评估的土壤是Eutric Regosol（RG），Haplic Lixisol（LX），Dystric Leptosol（LP）和Pellic Vertisol（VR）。为此，需要对桉树进行均质栽培（7岁）和草原（原生植被）地区被选中。在0–5、5–10和10–15厘米土壤层中对土壤有机物（SOM）进行了物理粒度分馏，定量分析了土壤中总有机碳（TOC）和总氮（TN）的水平，储量和分布。不稳定并与矿物成分有关，并计算出碳管理指数（CMI）。在0-5和5-10 cm的土壤层中，还评估了微生物生物量碳（MBC），微生物生物量氮（MBN），基础土壤呼吸，代谢系数，MBC / TOC，MBN / TN，MBC / MBN比。与草原相比，桉树种植分别增加了TOC和POC碳库（0-15厘米）8.7和21.7％（0-15厘米）。还观察到，桉树的种植量分别增加了TN和PN储量的6.7％和26.0％，与草原生物群落中的草原相比。与矿物相关的碳储量不受桉树种植的影响。桉树的种植增加了与草地有关的基础呼吸和微生物生物量碳，并且土壤中的微生物生物量氮减少了。因此，在巴西南部的潘帕生物群落中种植桉树表明，这是一种森林作物，可以促进总和不稳定碳储量的增加，还可以促进土壤生物量和微生物活性的增加，这是评估该指标的重要指标。土壤质量。桉树的种植增加了与草地有关的基础呼吸和微生物生物量碳，并且土壤中的微生物生物量氮减少了。因此，在巴西南部的潘帕生物群落中种植桉树表明，这是一种森林作物，可以促进总和不稳定碳储量的增加，还可以促进土壤生物量和微生物活性的增加，这是评估该指标的重要指标。土壤质量。桉树的种植增加了与草地有关的基础呼吸和微生物生物量碳，并且土壤中的微生物生物量氮减少了。因此，在巴西南部的潘帕生物群落中种植桉树表明，这是一种森林作物，可以促进总和不稳定碳储量的增加，还可以促进土壤生物量和微生物活性的增加，这是评估该指标的重要指标。土壤质量。