在不同的农业环境中,的可变性与传统来源相结合
Zachary P Simpson1, Joshua Mott2, Kyle Elkin3
1USDA-ARS, Sustainable Water Management Research Unit, Stoneville, Mississippi, USA.
Journal of environmental quality
|September 30, 2024
概括
土壤和沉积物中的不稳定 (P) 可以在几十年内污染水. 一个新的模型基于P量,缓冲容量和和度准确预测P释放,有助于水质管理.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 水质管理水质管理
背景情况:
- 景观中的 (P) 缓冲延迟了水质改善.
- 易于交换和生物利用的Labile P,对水污染构成重大风险.
- 在土壤和沉积物中遗留的P代表了长期的P损失来源.
研究的目的:
- 调查美国各地的土壤和沉积物中的 (P) 和其强度.
- 开发一种基于数量,强度和缓冲容量的P释放预测的通用模型.
- 为提高P运输模型的改进提供信息,以预测遗留的P影响.
主要方法:
- 研究了来自美国七个地区的600多种土壤和沉积物的性P及其强度.
- 评估P吸附特性,比较土壤和沉积物.
- 开发并验证了一个平衡酸盐度在净零吸附 (EPC0) 的模型,作为不稳定P和缓冲容量的函数.
主要成果:
- 发现了大量不稳定的P库存,能够维持数十年的高P损失 (运输限制制度).
- 沉积物通常比邻近的土壤具有更高的P吸附能力.
- 开发的EPC0模型在各种土壤和沉积物类型中得到了很好的概括,显示了增加的P释放,具有更高的可变性P和更低的缓冲容量/吸收位和度.
结论:
- 微量P是环境P管理的关键因素,广泛的数据证实了这一点.
- 量-强度-容量关系是P运输模型的基础.
- 结合这些发现的改进的P模型对于预测和管理传统P对水质的影响至关重要.
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