Global synthesis on the responses of microbial- and plant-derived carbon to conservation tillage

IF 4.1 2区农林科学 Q1 AGRONOMY Plant and Soil Pub Date : 2025-02-19 DOI:10.1007/s11104-025-07290-0

Yalin Yu, Li Li, Jinkang Yang, Yinan Xu, Ahmad Latif Virk, Jie Zhou, Feng-Min Li, Haishui Yang, Zheng-Rong Kan

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Abstract

Aims

The formation of soil organic carbon (SOC) is a complex phenomenon mainly originating from plant- and microbial-derived C. Conservation tillage involving no-till and residue return (RR) has been widely practiced to enhance SOC, but the relative contributions of plant- and microbial-derived C to SOC under these practices are still unknown.

Methods

A global meta-analysis of 500-paired observations was used to identify the effects of no-till and RR on plant- and microbial-derived C and their drivers.

Results

The results showed that no-till increased microbial necromass C by 18.3%, and the contribution of microbial necromass C to SOC by 5.0%, whereas plant necromass C and its contribution to SOC remained unchanged under no-till. No-till increased the ratio of fungal to bacterial necromass C by 12.3%, indicating fungal necromass C contributes more to SOC. The microbial necromass C under no-till was increased the most at MAP < 550 mm, humidity index < 85, medium-textured soil, acid soil, and initial C/N ratio ≥ 10 (P < 0.05). Dissolved organic and microbial biomass carbon contributed to the formation of microbial necromass C and benefited the SOC accumulation. RR increased plant and microbial necromass C by 83.8% and 13.0%, respectively, and enhanced the contribution of plant necromass C to SOC by 64.1%. Greater plant-derived C was observed when the experiment duration was over 3 years.

Conclusions

Our global meta-analysis highlighted that no-till can improve soil carbon stability (microbial-derived C) while RR can increase soil carbon quantity (plant-derived C). Conservation tillage (no-till and RR) is sustainable strategies through collaborative improvement of SOC capacity and quality.

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微生物和植物源碳对保护性耕作响应的全球综合研究

目的土壤有机碳（SOC）的形成是一个复杂的现象，主要来源于植物源碳和微生物源碳。保护性耕作包括免耕和残耕还田（RR）已被广泛用于提高土壤有机碳，但在这些耕作方式下，植物源碳和微生物源碳对土壤有机碳的相对贡献尚不清楚。方法对500对观测数据进行了全球荟萃分析，以确定免耕和抗耕对植物和微生物来源的碳的影响及其驱动因素。结果免耕使土壤微生物死质碳增加了18.3%，对有机碳的贡献增加了5.0%，而植物死质碳及其对有机碳的贡献保持不变。免耕使真菌坏死块C与细菌坏死块C的比值提高了12.3%，说明真菌坏死块C对土壤有机碳的贡献更大。免耕条件下，在MAP = 550 mm、湿度指数= 85、中等质地土壤、酸性土壤和初始C/N比值≥10时，土壤微生物坏死质量C增加最多（P = 0.05）。溶解的有机碳和微生物生物量碳有助于微生物坏死团C的形成，有利于有机碳的积累。RR处理使植物和微生物死质碳分别增加了83.8%和13.0%，使植物死质碳对有机碳的贡献增加了64.1%。当实验时间超过3年时，植物源性C含量增加。结论免耕能提高土壤碳稳定性（微生物源C），免耕能增加土壤碳量（植物源C），保护性耕作（免耕和免耕）是通过协同提高土壤有机碳容量和质量的可持续发展策略。

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来源期刊

Plant and Soil 农林科学-农艺学

CiteScore

8.20

自引率

8.20%

发文量

543

审稿时长

2.5 months

期刊介绍： Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.