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Carbon and nitrogen dynamics in soil organic matter fractions following eucalypt afforestation in southern Brazilian grasslands (Pampas)
Agriculture, Ecosystems & Environment ( IF 6.6 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.agee.2020.106979
Rafael S. Santos , Fernanda C.C. Oliveira , Gabriel W.D. Ferreira , Matheus A. Ferreira , Elias F. Araújo , Ivo R. Silva

Abstract The southern Brazilian grasslands (Pampas) are a new frontier of eucalypt plantation expansion, but the impacts of this land use change (LUC) on soil organic matter (SOM) are not well documented. In this study, we evaluated changes in the particulate organic matter (POM) and mineral-associated organic matter (MAOM) fractions following the afforestation of a grassland in southern Brazil over an entire eucalypt rotation. Additionally, SOM dynamics was assessed in two soil zones [row (R) and inter-row (IR)] created by soil preparation, which consists on scraping the soil surface from the IR to the R along with subsoiling to build ridges for eucalypt plating (i.e., ridge tillage). The soil was sampled to a depth of 60 cm in the R and IR positions, and the carbon (C) and nitrogen (N) in the SOM fractions were determined. We used natural 13C abundance differences to compare the contributions of the ‘new’ C input (C3, eucalypt stands) to the ‘native’ SOM (C4, grasslands). The conversion of the grassland to eucalypt stands resulted in losses in C and N stocks in both the R and IR after 68 months. Soil management controlled the magnitude and directions of C and N changes. The C loss in the R was ∼1.3-fold higher than that in the IR (20.6 Mg ha−1; p

中文翻译:

巴西南部草原(潘帕斯草原)桉树造林后土壤有机质组分的碳和氮动态

摘要 巴西南部草原 (Pampas) 是桉树种植园扩张的新前沿,但这种土地利用变化 (LUC) 对土壤有机质 (SOM) 的影响尚未得到充分记录。在这项研究中,我们评估了巴西南部草原在整个桉树轮作期间植树造林后颗粒有机物 (POM) 和矿物相关有机物 (MAOM) 组分的变化。此外,SOM 动态在两个土壤区域 [行 (R) 和行间 (IR)] 中进行了评估,该区域由整地创建,包括将土壤表面从 IR 刮到 R 以及下松以建立用于桉树电镀的脊(即垄耕)。在 R 和 IR 位置对土壤取样至 60 cm 的深度,并测定 SOM 组分中的碳 (C) 和氮 (N)。我们使用天然 13C 丰度差异来比较“新”C 输入(C3,桉树林分)对“原生”SOM(C4,草原)的贡献。68 个月后,草地向桉树林分的转变导致 R 和 IR 中 C 和 N 库的损失。土壤管理控制着 C 和 N 变化的幅度和方向。R 中的 C 损失比 IR 中的 C 损失高约 1.3 倍(20.6 Mg ha-1;p
更新日期:2020-10-01
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