同位素交换性表明,土壤中的磷酸盐会被羧酸根阴离子移动,而酸化则会产生相反的效果

IF 5.8 2区 农林科学 Q1 SOIL SCIENCE
Soil Pub Date : 2024-07-18 DOI:10.5194/egusphere-2024-1791
Siobhan Staunton, Chiara Pistocchi
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引用次数: 0

摘要

摘要。矿质钾是一种日益稀缺的资源,因此必须优化对遗留土壤钾的调动,以保持土壤肥力。我们利用同位素交换性探究了酸化和在土壤悬浮液中添加羧酸根阴离子(柠檬酸根和草酸根)后四种对比土壤中原生土壤钾的稳定性。酸化往往会导致土壤中 P 的固定,但这归因于盐效应。这可能是由于羧酸根离子和磷酸根离子在吸附位点上的竞争以及电荷补偿阳离子的螯合作用。在每个酸化水平下,羧酸盐的影响都是相似的,这表明影响在很大程度上是相加的。而石灰性最强的土壤则不然,在草酸盐添加量最高的情况下,草酸钙可能会沉淀。通过土壤改良或使用能释放大量羧酸根阴离子的农作物来促进土壤中的羧酸根阴离子,是一种很有前景的改善土壤钾供应的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Isotopic exchangeability reveals that soil phosphate is mobilised by carboxylate anions whereas acidification had the reverse effect
Abstract. Mineral P is an increasingly scarce resource and therefore the mobilisation of legacy soil P must be optimised to maintain soil fertility. We have used isotopic exchangeability to probe the lability of native soil P in four contrasting soils following acidification and the addition of carboxylate anions (citrate and oxalate) in soil suspension. Acidification tended to cause immobilisation of soil P, but this was attributed to a salt effect. Addition of both citrate and oxalate led to marked increases in mobilisation of soil P. This would result from both competition between carboxylate and phosphate ions at adsorption sites and chelation of charge compensating cations. The carboxylate effects were similar at each level of acidification, indicating that effects were largely additive. This is not true for the most calcareous soil where calcium oxalate may have been precipitated at the highest oxalate addition. Promoting carboxylate anions in soil by soil amendment or the use of crops that exude large amounts of such organic anions is a promising approach to improve soil P availability.
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来源期刊
Soil
Soil Agricultural and Biological Sciences-Soil Science
CiteScore
10.80
自引率
2.90%
发文量
44
审稿时长
30 weeks
期刊介绍: SOIL is an international scientific journal dedicated to the publication and discussion of high-quality research in the field of soil system sciences. SOIL is at the interface between the atmosphere, lithosphere, hydrosphere, and biosphere. SOIL publishes scientific research that contributes to understanding the soil system and its interaction with humans and the entire Earth system. The scope of the journal includes all topics that fall within the study of soil science as a discipline, with an emphasis on studies that integrate soil science with other sciences (hydrology, agronomy, socio-economics, health sciences, atmospheric sciences, etc.).
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