Soil net carbon balance depends on soil C: N: P stoichiometry

IF 6.1 1区 农林科学 Q1 SOIL SCIENCE
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Abstract

Exogenous carbon (C) input may induce priming effects, leading to the loss of soil organic C (SOC) by accelerating the decomposition of native soil organic matter (SOM), while also replenishing SOC through various mechanisms. However, the net C balance resulting from priming and replenishment of SOC under long-term nitrogen (N) fertilization and its stoichiometric regulation mechanisms remain largely undetermined. Soils subjected to 11 years of different N applications were used to investigate the net C balance following the addition of exogenous 13C-labeled glucose. The retention of glucose-derived C exceeded the loss of C caused by the priming effect, resulting in a positive net C balance, albeit attenuated by historical N application (ranging from 25.9 to 36.9 μg C mg−1 SOC). The application of increasing historical N levels resulted in a decrease in soil C:N imbalance and an increase in soil N:phosphorus (P) imbalance, as well as an increase in TERC:N and TERC:P. This suggested that the C and/or P limitations of soil microbial communities were intensified with increased N availability. Soil nutrient stoichiometric imbalance and available resource stoichiometry directly influenced the threshold element ratio, which in turn impacted glucose mineralization, subsequently affecting the net C balance. Collectively, our results provided solid evidence that labile C input could lead to a positive net C balance, which diminished with increased historical N application and was primarily regulated by soil C:N:P stoichiometry. This study highlights the significant implications for the soil C turnover and sequestration under long-term N application management in agroecosystems.

土壤净碳平衡取决于土壤 C:N:P 的化学计量
外源碳(C)的输入可能会产生启动效应,通过加速原生土壤有机质(SOM)的分解而导致土壤有机碳(SOC)的损失,同时也会通过各种机制补充土壤有机碳。然而,在长期氮肥施用条件下,SOC 的启动和补充所导致的净碳平衡及其化学计量调节机制在很大程度上仍未确定。研究人员利用施用了 11 年不同氮肥的土壤来研究添加外源 13C 标记葡萄糖后的净碳平衡。葡萄糖衍生碳的保留超过了引物效应造成的碳损失,从而导致净碳平衡为正,尽管历史氮施用量(25.9 至 36.9 μg C mg-1 SOC)有所减少。历史上氮含量的增加导致土壤碳:氮不平衡的减少和土壤氮:磷不平衡的增加,以及 TERC:N 和 TERC:P 的增加。这表明,随着氮供应的增加,土壤微生物群落对碳和/或磷的限制加剧。土壤养分化学计量失衡和可用资源化学计量直接影响阈值元素比率,进而影响葡萄糖矿化,进而影响净碳平衡。总之,我们的研究结果提供了确凿的证据,表明可变碳输入可导致正的净碳平衡,这种平衡随着历史上氮施用量的增加而减弱,并且主要受土壤碳:氮:磷比例的调节。这项研究强调了在农业生态系统中长期施氮管理下土壤碳周转和固碳的重要意义。
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来源期刊
Soil & Tillage Research
Soil & Tillage Research 农林科学-土壤科学
CiteScore
13.00
自引率
6.20%
发文量
266
审稿时长
5 months
期刊介绍: Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research: The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.
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