将土壤磷吸附能力与农艺指数相结合,提高农业中磷的可持续利用率

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES
Sifan Yang, Blánaid White, Fiona Regan, Nigel Kent, Rebecca L. Hall, Karen Daly
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引用次数: 0

摘要

目的 土壤中的磷(P)吸附过程会影响植物对磷的利用率,并影响磷的 "积累 "和 "吸收 "循环。目前的施肥建议并未考虑这些过程。本研究旨在整合土壤对 P 的吸附行为和 P 的农艺指数,以加强对 P 的管理建议。方法根据 P 状态(摩根 P 和 Mehlich-3 P)、Langmuir 吸附参数 P 吸附最大容量(Smax,mg-kg-1)和结合能(k,L-mg-1)对爱尔兰 35,716 平方公里的矿质土壤进行表征。结果 Smax 与 M3-Al 之间的分段回归(R2 = 0.49)在 Smax = 450.03 mg-kg-1 处发现了一个显著的变化点,在此点上可将土壤划分为 "低"(SLM3-Al)和 "高"(SHM3-Al)磷吸附等级。SLM3-Al 中的吸附参数不随土壤钾状况的变化而变化;但在高钾吸附土壤中,吸附参数与钾状况显著相关。缺钾(指数 1 和 2)的高吸钾土壤会 "固定 "钾,需要更长的时间才能将植物可用钾积累到农艺生产所需的值(指数 3)。高吸钾状态下的低吸钾土壤(指数 4)会比高吸钾土壤以更快的速度下降到指数 3。这些土壤(SLM3-Al)由于结合能较低,可溶性钾流失到水中的风险较高。结论如果将土壤划分为 "低 "和 "高 "吸附性土壤,并结合土壤钾状况,就能更有效地使用钾肥。通过将钾吸附能力与农艺学土壤钾指数相结合,可以有针对性地提供更有效的施肥建议和水质措施。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Integrating soil phosphorus sorption capacity with agronomic indices to improve sustainable P use in agriculture

Integrating soil phosphorus sorption capacity with agronomic indices to improve sustainable P use in agriculture

Purpose

Phosphorus (P) sorption processes in soils can influence P plant-availability and influence ‘build-up’ and ‘draw-down’ P cycles. Current fertiliser recommendations do not take these processes into account. This study aimed to integrate soil P sorption behaviour and P agronomic-indices to strengthen P management recommendations.

Methods

Mineral soil covering 35,716-km2 of Ireland was characterised by P status (Morgan’s P and Mehlich-3 P), and Langmuir sorption parameters of P sorption maximum capacity (Smax, mg·kg−1) and binding energy (k, L·mg−1).

Results

Segmented regression between Smax and M3-Al (R2 = 0.49) identified a significant change-point at Smax = 450.03 mg·kg−1, at which soils can be placed into ‘low’ (SLM3-Al) and ‘high’ (SHM3-Al) P sorbing classes. Sorption parameters in SLM3-Al did not change with soil P status; however, in high P sorbing soils, sorption parameters significantly correlated with P status. High sorbing soils that are P-deficient (Index 1 and 2) will ‘fix’ P and take longer to build-up plant available P to a value for agronomic production (Index 3). Low P sorbing soils at high P status (Index 4) will decline to Index 3 at faster rates than high P sorbing soils. These soils (SLM3-Al) are at higher risk of soluble P losses to water because of lower binding energies.

Conclusions

Efficient P fertiliser use can be more effective if soils are delineated into ‘low’ and ‘high’ sorbing soils coupled with soil P status. By integrating P sorption capacities with agronomic soil P indices, fertiliser advice and water quality measures can be targeted and more effective.

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来源期刊
Journal of Soils and Sediments
Journal of Soils and Sediments 环境科学-土壤科学
CiteScore
7.00
自引率
5.60%
发文量
256
审稿时长
3.5 months
期刊介绍: The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.
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