Fungal necromass carbon contributes to organic carbon sequestration within soil macroaggregates under manure application combined with plastic film mulching

IF 2.8 3区农林科学 Q3 ENVIRONMENTAL SCIENCES Journal of Soils and Sediments Pub Date : 2024-03-16 DOI:10.1007/s11368-024-03775-0

Xu Liu, Roland Bol, Tingting An, Yingde Xu, Chang Peng, Shuangyi Li, Jingkuan Wang

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Abstract

Purpose

Microbial necromass carbon (C) is a major contributor to soil organic C (SOC) sequestration. Soil aggregates are key functional units in regulating SOC dynamics. Fertilization and plastic film mulching, as common agricultural management practices, affect soil aggregation and microbial activities. However, how microbial necromass C is accumulated and contributes to organic C sequestration within soil aggregates remains poorly understood, especially under fertilization combined with plastic film mulching.

Methods

We set the mulching and no-mulching sub-treatments under three long-term (28 years) fertilization treatments (no fertilization, NF; inorganic fertilization, IF; manure application, MF) and conducted a 900-day field mesocosm experiment. We quantified the proportion of microbial necromass C in organic C within soil aggregates using amino sugar biomarkers, and investigated the effects of fertilization combined with mulching on the dynamics of microbial necromass C within soil aggregates.

Results

Microbial necromass C accounted for 28.2–42.9% of organic C of macroaggregates (> 0.25 mm) and 40.4–55.8% of organic C of microaggregates (< 0.25 mm) on day 900. The proportion of fungal necromass C in organic C of soil aggregates was nearly two times more than that of bacterial necromass C within 360–900 days. Regardless of mulching or no-mulching, the MF treatment increased the microbial necromass C content within macroaggregates and microaggregates, on average, by 148.6% and 84.5% compared with the NF treatment during the entire incubation period, respectively. Mulching facilitated microbial necromass C accrual within macroaggregates under the NF and IF treatments only on day 360, but increased it under the MF treatment on both day 360 and day 900. Mulching increased the fungal necromass C content and its contribution to organic C within macroaggregates by an average of 17.4% and 11.2% under the MF treatment during the entire incubation period, respectively.

Conclusions

Manure application combined with mulching promoted organic C sequestration within macroaggregates via the accumulation of fungal necromass C.

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在施用粪肥和塑料薄膜覆盖的条件下，真菌新陈代谢产生的碳有助于土壤大颗粒中的有机碳固存

目的微生物坏死碳（C）是土壤有机碳（SOC）螯合的主要贡献者。土壤团聚体是调节 SOC 动态的关键功能单元。施肥和塑料薄膜覆盖作为常见的农业管理方法，会影响土壤团聚和微生物活动。方法我们在三种长期（28 年）施肥处理（不施肥，NF；无机施肥，IF；施肥，MF）下设置了地膜覆盖和不地膜覆盖子处理，并进行了为期 900 天的田间中观试验。我们利用氨基酸糖生物标记物量化了土壤团聚体中微生物坏死物质 C 在有机 C 中的比例，并研究了施肥与覆盖相结合对土壤团聚体中微生物坏死物质 C 动态变化的影响。结果在第 900 天，微生物坏死物质 C 占大团聚体（> 0.25 mm）有机 C 的 28.2-42.9%，占微团聚体（< 0.25 mm）有机 C 的 40.4-55.8%。在 360-900 天内，土壤团聚体有机碳中真菌坏死物质碳的比例是细菌坏死物质碳的近 2 倍。在整个培养期内，无论是否覆盖地膜，MF 处理与 NF 处理相比，大聚集体和微聚集体中的微生物坏死物质 C 含量平均分别增加了 148.6% 和 84.5%。在 NF 和 IF 处理中，覆膜仅在第 360 天促进了大团聚体中微生物坏死质 C 的积累，但在 MF 处理中，覆膜在第 360 天和第 900 天都会增加微生物坏死质 C 的积累。结论施用粪肥与覆盖物相结合可通过真菌坏死物质 C 的积累促进有机碳在大聚落内的固碳。

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来源期刊

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.