Effects of exogenous nitrogen addition on soil organic nitrogen fractions in different fertility soils: Result from a 15N cross-labeling experiment

IF 6 1区农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY

Agriculture, Ecosystems & Environment Pub Date : 2024-11-05 DOI:10.1016/j.agee.2024.109366

Yu Ning , Shuailin Li , Chuanchuan Ning , Jinfeng Ren , Zhuqing Xia , Mengmeng Zhu , Yun Gao , Xinhui Zhang , Qiang Ma , Wantai Yu

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引用次数: 0

Abstract

Exogenous nitrogen (N) addition serves as a pivotal nutrient management strategy, significantly enhancing agricultural production by regulating soil N availability and retention. However, the dynamics of soil organic nitrogen (SON) fractions in response to various forms of exogenous N addition across differing soil fertility levels remain inadequately understood. This study utilized data from a 25-year fertilization experiment and a ¹⁵N cross-labeling experiment in Northeast China to assess and quantify the effects of mineral N fertilizers and organic materials (manure and straw) on SON fractions in NPK (mineral fertilizer addition) and NPKM (NPK combined with composted pig manure) treatments. Our findings indicate that long-term incorporation of manure substantially elevates soil fertility compared to the exclusive use of mineral fertilizers. Notably, exogenous N primarily boosts soil N availability by enhancing acid-soluble organic N fractions, particularly ammonium nitrogen (AN) and amino acid nitrogen (AAN). Organic materials, particularly straw, significantly enhanced the retention of mineral fertilizer N in both NPK and NPKM treatments (9.54 % vs 10.70 %). Moreover, over 70 % of the N from straw or manure remained in the soil as stable SON fractions. While straw rapidly improves low-fertility soils, manure contributes to enhanced soil N reserves and increased crop yields. Therefore, incorporating organic matter may bolster soil N sequestration in Northeast China, which is contingent upon soil fertility and tailored fertilizer management strategies. This research elucidates the distribution and conversion of exogenous N within SON pools, facilitating optimized N management, sustaining yields, reducing farmland N pollution, and promoting agricultural sustainability.

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外源氮添加对不同肥力土壤中有机氮组分的影响：15N 交叉标记实验的结果

外源氮（N）添加作为一种关键的养分管理策略，通过调节土壤氮的供应和保持，显著提高了农业产量。然而，人们对不同土壤肥力水平下土壤有机氮（SON）组分对各种外源氮添加形式的响应动态仍然了解不足。本研究利用在中国东北地区进行的一项为期 25 年的施肥试验和一项 15N 交叉标记试验的数据，评估并量化了矿物氮肥和有机材料（粪肥和秸秆）对 NPK（添加矿物肥料）和 NPKM（NPK 与堆肥猪粪相结合）处理中有机氮组分的影响。我们的研究结果表明，与只使用矿物肥料相比，长期施用粪肥可大幅提高土壤肥力。值得注意的是，外源氮主要通过提高酸溶性有机氮组分，尤其是铵态氮（AN）和氨基酸态氮（AAN）来提高土壤氮的可用性。在 NPK 和 NPKM 处理中，有机材料（尤其是秸秆）都能显著提高矿物肥料氮的保留率（9.54% 对 10.70%）。此外，秸秆或粪肥中超过 70% 的氮以稳定的 SON 分馏物形式留在土壤中。秸秆能迅速改善低肥力土壤，而粪肥则有助于增加土壤氮储备和提高作物产量。因此，在中国东北地区，施用有机质可促进土壤固氮，但这取决于土壤肥力和有针对性的肥料管理策略。这项研究阐明了外源氮在SON池中的分布和转化，有助于优化氮管理、维持产量、减少农田氮污染和促进农业可持续发展。

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来源期刊

Agriculture, Ecosystems & Environment 环境科学-环境科学

CiteScore

11.70

自引率

9.10%

发文量

392

审稿时长

26 days

期刊介绍： Agriculture, Ecosystems and Environment publishes scientific articles dealing with the interface between agroecosystems and the natural environment, specifically how agriculture influences the environment and how changes in that environment impact agroecosystems. Preference is given to papers from experimental and observational research at the field, system or landscape level, from studies that enhance our understanding of processes using data-based biophysical modelling, and papers that bridge scientific disciplines and integrate knowledge. All papers should be placed in an international or wide comparative context.