北卡罗来纳州代表性农业田的分数状况
Andria Paula Lima1, Luke Gatiboni2, Dionata Filippi2
1Department of Soil Science, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
Journal of environmental quality
|July 1, 2025
概括
北卡罗来纳州的农业土壤显示高积累,主要是封闭的P.由于过度施肥和保存不良,大多数县面临污染的风险,需要改进的P管理策略.
科学领域:
- 土壤科学 土壤科学
- 环境化学环境化学
- 农业科学 农业科学
背景情况:
- 北卡罗来纳州的农业土壤通常呈现高 (P) 水平.
- 对于各种P分量的分布及其相关的环境风险的了解有限.
研究的目的:
- 为了描述北卡罗来纳州农业土壤中的土壤P分数.
- 评估积累的P分数所带来的环境风险.
- 为了将P分数与土壤特性和管理实践相关联.
主要方法:
- 来自57个县的391个土壤样本的连续化学分化.
- 使用CaCl2,Mehlich-3,NaOH和HCl提取P的方法.
- 确定封闭的P (POCL) 和总的P (PT).
- 对土壤管理实践和作物历史的分析.
主要成果:
- 封闭的P (POCL) 是占主导的部分 (39%),其次是NaOH提取物中的无机P (PiOH,26%).
- 沿海平原土壤的Mehlich-3 P (PM3) 含量最高 (79毫克/公斤-1),超过了所有地区的临界水平.
- 75%的评估县显示P污染的风险很高,沿海平原土壤具有最高的P和度 (29%).
结论:
- 土壤P分数在北卡罗来纳州的不同地区有很大差异,受土壤特性 (如粘土,沙子,Fe,Al和有机物质含量) 的影响.
- 过度的P受精和有限的保护实践的采用有助于高P积累和污染风险.
- 为了减轻环境风险,需要紧急改进P的管理策略.
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