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在关键来源区域的牧场土壤短期浸泡下释放

Janani Palihakkara¹, Lucy Burkitt², Paramsothy Jeyakumar²

¹Environmental Sciences Group, School of Agriculture and Environment, Massey University, Palmerston North, 4442, New Zealand; Department of Soil Science, Faculty of Agriculture, University of Peradeniya, Peradeniya, 20400, Sri Lanka.

Journal of environmental management

|January 29, 2025

概括

新西兰的关键来源区域 (CSA) 在频繁降雨期间释放 (P). 最近的土壤对P的释放风险高于可以吸收P的Pallic或Allophanic土壤,这可以吸收P.

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:

关键来源区域 (CSAs) 是表面水中 (P) 的重要贡献者.
频繁的降雨事件可能导致CSA土壤中的P释放.
短期,频繁的潜水对新西兰CSA中P释放的影响需要进行系统研究.

研究的目的:

为了研究三个对比的新西兰农田土壤 (新鲜的,pallic,allophanic) 在短期,频繁的潜水下释放的P潜力.
为了在不同类型的土壤中比较孔水和池水中的P释放动态.
确定P释放的机制,并评估与CSA不同类型土壤相关的风险.

主要方法:

收集了近期土壤,地土壤和地土壤类型的未被干扰的土壤块.
模拟了6个短期潜水事件,控制水位.
在孔水和池水中测量了溶解反应 (DRP),pH,溶解有机碳和其他水质参数.
分析了土壤P分数,并使用热力学建模来理解P矿物动力学.

主要成果:

最近的土壤释放了大量的P到孔水和池水中.
棕色土壤将P释放到孔水中,但没有显著改变池水 DRP.
化土壤吸收了P,减少了DRP在孔水和池水中.
沉浸期间的平均池水DRP水平远高于新西兰的目标度.

结论:

最近的土壤具有较高的风险,因为在频繁的潜水下释放P,导致P流失到地表水中.
性土壤和性土壤显示了保留的潜力,性土壤作为吸附材料.
这些发现强调了土壤类型在管理CSAs中的P损失方面的重要性,并表明Allophanic土壤可以减轻P流失.

关键词:

这是全神经的.溶解的反应性.帕利克帕利克 (Pallic Pallic) 是一种有色的物质.最近最近最近最近最近最近短期频繁的潜水情况.

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The Phosphorus Cycle

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.

Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.

Responses to Drought and Flooding

Responses to Drought and Flooding

Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.