当前位置: X-MOL 学术Soil Tillage Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Soil carbon, nitrogen dynamics, and energy, carbon budgeting in response to uncultivated land management with crop biomass in the southwestern US
Soil and Tillage Research ( IF 6.1 ) Pub Date : 2024-12-31 , DOI: 10.1016/j.still.2024.106427
Hui Yang, Manoj K. Shukla, John Begay

Uncultivated agricultural land management by leaving biomass of the last crop planted in the field can prevent soil health degradation over time. However, the effects of different uncultivated land management practices on soil organic carbon stock, total nitrogen stock, and soil health changes remain unclear. A field experiment from June 2021 to September 2023 investigated the effects of integrated crop residue-uncultivated land management. The treatments include winter wheat in fall then uncultivated with entire crop biomass left in the farm (WT); corn in summer then uncultivated with biomass (CT); bare or no vegetation (BT); and continuous annual irrigated winter wheat (CWT). The study focused on investigating changes in soil organic carbon (SOC), soil inorganic carbon (SIC), total carbon (TC), and total nitrogen (TN) in 100 cm soil depth and quantifying cost budgeting, energy budgeting, and carbon budgeting in various treatments. The results showed that the highest SOC stock for 0–100 cm soil depth (115.2 Mg/ha) with an increase of 49.6 % was observed in CWT. However, the SIC stocks in CWT were 37.4 %, 52.4 %, and 36.3 % lower than those in BT, CT, and WT, respectively. No significant differences in TN stocks were observed between the four treatments after 3-year implementations of land management, WT showed slightly higher TN stock in 100 cm depth than the other three treatments. Considering the budgets of cost, energy, and carbon, although CT had the highest net returns of 7726.3 US$/ha, WT increased surface coverage thereby enhancing the net energy (275776.4 MJ/ha), energy use efficiency (12.0), energy profitability (10.97), carbon efficiency (12.41) and carbon sustainability index (11.41), accompanied by second highest net returns of 6610.6 US$/ha. Planting winter wheat in one season and then leaving the land uncultivated, with the entire biomass left on the land, not only reduces soil degradation but also improves carbon and energy efficiency. This approach could be an effective solution for land management and groundwater conservation in the Lower Rio Grande Valley.

中文翻译:


土壤碳、氮动力学和能量、响应美国西南部作物生物量未耕地管理的碳预算



通过将最后一种作物的生物质留在田间来管理未开垦的农业用地,可以防止土壤健康随着时间的推移而退化。然而,不同的未耕地管理做法对土壤有机碳储量、总氮储量和土壤健康变化的影响仍不清楚。2021 年 6 月至 2023 年 9 月的一项田间实验调查了作物残茬未耕地综合管理的效果。处理方法包括秋季播种冬小麦,然后未种植,农场中保留整个作物生物质 (WT);夏季玉米,然后用生物质 (CT) 未耕作;裸露或无植被 (BT);以及连续一年生灌溉冬小麦 (CWT)。该研究的重点是调查 100 cm 土壤深度土壤有机碳 (SOC)、土壤无机碳 (SIC)、总碳 (TC) 和总氮 (TN) 的变化,并量化各种处理中的成本预算、能源预算和碳预算。结果表明,在 CWT 中观察到 0-100 cm 土壤深度 (115.2 Mg/ha) 的 SOC 储量最高,增加了 49.6 %。然而,CWT 中的 SIC 存量分别比 BT、CT 和 WT 低 37.4 %、52.4 % 和 36.3 %。实施土地管理 3 年后,四种处理间未观察到 TN 储量的显著差异,WT 在 100 cm 深度的 TN 储量略高于其他 3 个处理。考虑到成本、能源和碳的预算,尽管 CT 的净回报率最高,为 7726.3 美元/公顷,但 WT 增加了地表覆盖率,从而提高了净能源 (275776.4 MJ/ha)、能源利用效率 (12.0)、能源盈利能力 (10.97)、碳效率 (12.41) 和碳可持续性指数 (11.41),并获得了 6610.6 美元/公顷的第二高净回报率。 在一个季节中种植冬小麦,然后不耕种土地,将全部生物质留在土地上,不仅可以减少土壤退化,还可以提高碳和能源效率。这种方法可能是下里奥格兰德河谷土地管理和地下水保护的有效解决方案。
更新日期:2024-12-31
down
wechat
bug