土壤剖面温室气体排放对氮肥的响应：三年实地观测与meta分析

IF 5.6 1区农林科学 Q1 AGRONOMY

Field Crops Research Pub Date : 2025-05-13 DOI:10.1016/j.fcr.2025.109987

Jin Liu , Yangquanwei Zhong , Jiajia Fu , Zhouping Shangguan , Lei Deng , Weiming Yan

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引用次数: 0

摘要

背景越来越多的田间研究探讨了氮肥对土壤温室气体（GHG）通量的影响，但氮肥对土壤剖面温室气体通量的影响及其影响因素尚不清楚。目的从局地到全球尺度量化土壤剖面温室气体通量对氮肥的响应。此外，我们还探讨了影响土壤剖面温室气体通量的关键驱动因素。方法采用3年试验研究了不同施氮量（0 kg ha−1年−1、180 kg ha−1年−1、360 kg ha−1年−1）下小麦农田土壤剖面温室气体通量的动态变化。此外，还进行了一项全球荟萃分析，其中包括643个与全球旱地农田氮肥处理下土壤剖面温室气体通量相关的成对观测数据。结果施氮可略微增加土壤剖面CO2通量，而施氮量增加可增加下层（20 ~ 60 cm） N2O通量。施氮量、土壤深度、生长季节以及这些因素引起的土壤理化性质（土壤温湿度等）变化影响温室气体通量。全球meta分析显示，施氮促进了表层（0 ~ 10 cm）的CO2排放，以及除60 cm以下的CH4吸收外的全剖面N2O和CH4通量。土壤质地和土壤因子变化影响全球温室气体通量对氮肥的响应。结论氮肥对土壤温室气体通量的影响存在差异，主要受氮素诱导的土壤理化性质变化驱动。本研究强调了土壤剖面温室气体通量对氮肥的不同响应，未来土壤碳氮循环过程的研究应纳入土壤下层温室气体排放。

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Response of soil profile greenhouse gas emissions to nitrogen fertilization: Three-year field observations and meta-analysis

Context

A growing number of field studies have investigated the effect of nitrogen (N) fertilization on soil greenhouse gas (GHG) fluxes, yet the N fertilization impacts on GHG fluxes in soil profile and its influencing factors remain unclear.

Objectives

The study aim to quantify the responses of GHG fluxes in the soil profile to N fertilization from local to global scales. Additionally, we explore the key drivers influencing soil profile GHG fluxes.

Methods

We conducted a three-year experiment to investigate the dynamic of GHG fluxes in soil profile at different N rates (0 kg ha⁻¹ year⁻¹, 180 kg ha⁻¹ year⁻¹, 360 kg ha⁻¹ year⁻¹) in a wheat cropland. Furthermore, a global meta-analysis that including 643 paired observations related to GHG fluxes in soil profile under N fertilization in dryland cropland worldwide was performed.

Results

N fertilization slightly increased CO₂ flux in the soil profile, while higher N rate increased N₂O flux in subsoil layer (20–60 cm). The N application rate, soil depth, growing season, and the changes in soil physicochemical properties (soil temperature and moisture, etc.) induced by these factors influenced GHG fluxes. The global meta-analysis revealed that N fertilization promoted CO₂ emission in surface soil layer (0–10 cm), and N₂O and CH₄ fluxes through the whole soil profile, except for CH₄ uptake below 60 cm. Soil texture and edaphic factor variations affected global GHG flux responses to N fertilization.

Conclusion

The divergent impacts of N fertilization on GHG fluxes among soil layers were driven by N-induced soil physicochemical property changes.

Implications

The study highlights the varied response of GHG fluxes in soil profile to N fertilization, and future studies on soil carbon and N cycling processes should incorporate subsoil layers GHG emissions.

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来源期刊

Field Crops Research 农林科学-农艺学

CiteScore

9.60

自引率

12.10%

发文量

307

审稿时长

46 days

期刊介绍： Field Crops Research is an international journal publishing scientific articles on: √ experimental and modelling research at field, farm and landscape levels on temperate and tropical crops and cropping systems, with a focus on crop ecology and physiology, agronomy, and plant genetics and breeding.