由于干燥和未干燥的土壤以及以前的玉米管理,大豆的氧化排放是对干燥和未干燥的土壤和玉米的反应
Karina P Fabrizzi1, Fabián G Fernández1, Rodney T Venterea1,2
1Department of Soil, Water, and Climate, University of Minnesota, Saint Paul, Minnesota, USA.
Journal of environmental quality
|May 24, 2024
概括
与大豆相比,玉米中的化肥显著增加了氧化 (N2O) 排放量. 瓦排水可以帮助减轻这些农业排放,特别是在排水不良的土壤中.
科学领域:
- 农业科学 农业科学
- 土壤科学 土壤科学
- 环境科学 环境科学
背景情况:
- 玉米-大豆旋转是美国中西部的主要农业系统.
- 化肥对玉米的影响及其对后续大豆作物的残留影响,包括氧化 (N2O) 排放和土壤排水,需要进一步调查.
研究的目的:
- 评估应用在玉米上的 (N) 施肥对大豆农学参数和N2O排放的残留影响.
- 评估不同N管理策略 (0-N和135公斤N ha-1) 和土壤排水 (排水与未排水) 对下列大豆作物的影响.
主要方法:
- 实地实验在一个排水不良的土壤中,有和没有地下排水.
- 尿素应用于玉米,其余效应在随后的一年对大豆进行监测.
- 量化大豆产量,在谷物中去除和整个季节的N2O排放.
主要成果:
- 上一个玉米作物的管理没有影响大豆谷物产量,去除或N2O排放.
- 玉米阶段的N2O排放量 (1.83公斤N ha-1) 与大豆阶段 (0.80公斤N ha-1) 相比,在玉米阶段显著更高.
- 瓦排水在三个生长季节之一中减少了N2O排放,但没有影响大豆产量或N去除.
结论:
- 大豆种植的N2O排放量低于受精玉米,尽管谷物中N的去除率更高.
- 大豆残留物的分解可能会导致玉米年中较高的N2O排放,而玉米残留物在大豆年中较高.
- 瓦排水为减轻农业N2O排放提供了一个可行的策略,特别是在排水条件不佳的情况下.
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