Appropriate fertilization increases carbon and nitrogen sequestration and economic benefit for straw-incorporated upland farming

作者：Jinjin Wang, Xu Sun, Luning Du, Weili Sun, Xiaoling Wang, Abdel‐Rhman Z. Gaafar, Peng Zhang, Tommaso Cai, Tiening Liu, Zhikuan Jia, Xiaoli Chen, Xiaolong Ren · 发表于：Geoderma · 年份：2024 · DOI：10.1016/j.geoderma.2023.116743 · 被引用次数：36 · 研究领域：Soil Carbon and Nitrogen Dynamics、Soil and Water Nutrient Dynamics、Peatlands and Wetlands Ecology

Long-term fertilization management is not only an important source of nutrients to ensure food productivity, but also significantly affects soil organic carbon (SOC) and total nitrogen (TN) sequestration in agroecosystems, as well as strongly affects soil aggregate structure and microbiological characteristics. Straw incorporation is expected to promote SOC and TN. However, how long-term fertilization managements change soil aggregate distribution, SOC and TN components, and microbiological characteristics in straw-returned dryland fields are unknown, and how the quantitative analysis of the relationship between SOC and TN and biological factors, as well as their relative importance at an aggregate scale, are equally unknown. In addition, whether fertilization management can achieve higher crop productivity and economic efficiency while achieving higher soil carbon and nitrogen sequestration is a topic of greater concern to farmers. A 10-year in situ field fertilization experiment with five N application rates (0, 75, 150, 225, and 300 kg·N·ha−1, denoted as N0, N75, N150, 225, and N300, respectively) was conducted on straw-returned dryland. The wet sieving method was used to investigate the soil aggregates distribution in aggregate fractions (>5, 5–2, 2–1, 1–0.5, 0.5–0.25, and < 0.25 mm) at topsoil (0–20 cm) at different N application rates. The results showed that fertilization significantly increased the proportion of macro-aggregates (>0.25 mm) and mean weight diameter. Th...