Tracing Rhizodeposition Contributions to Soil Organic Carbon under Long-Term Tillage in a Wheat-Maize System Using Stable Isotope Labeling.

IF 6.2 1区农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY

Journal of Agricultural and Food Chemistry Pub Date : 2025-10-25 DOI:10.1021/acs.jafc.5c10938

Wen-Sheng Liu,Hong-Xuan Duan,Yu-Xuan Che,Cong He,Jin-Sai Chen,Xin Zhao,Yash Pal Dang,Hai-Lin Zhang

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引用次数: 0

Abstract

Transferring photosynthetic C to soil organic C (SOC) via rhizodeposition is essential for soil health and soil C sequestration. This study employed 13C isotope labeling to quantify rhizodeposition C transfer and examined its relationship with soil properties and microbial communities in a 15-year long-term tillage experiment. The treatments included no-tillage (NTS), plow tillage (CTS), and rotary tillage (RTS), all implemented with straw return. The results showed that the rhizodeposition C transfer and microbial community compositions varied between wheat and maize. Rhizosphere-specific taxa, such as Galbitalea in wheat and Priestia in maize, were enriched under NTS. Compared to CTS, RTS increased rhizosphere 13C-SOC by 65% in wheat, while NTS increased it by 99% in maize, thereby enhancing rhizodeposition C transfer. Furthermore, NTS facilitated fungal community stability and DOC turnover, collectively promoting rhizodeposition C transfer. Optimizing crop-specific tillage strategies can enhance C transfer, improve soil health, and mitigate climate change.

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利用稳定同位素标记追踪小麦-玉米系统长期耕作下根系沉积对土壤有机碳的贡献

通过根沉积将光合碳转化为土壤有机碳（SOC）对土壤健康和固碳至关重要。本研究通过15年长期耕作试验，采用13C同位素标记法量化根际沉积碳转移，并研究其与土壤性质和微生物群落的关系。处理包括免耕（NTS）、犁耕（CTS）和旋转耕（RTS），均采用秸秆还田。结果表明，小麦和玉米根系沉降、碳转移和微生物群落组成存在差异。根际特异分类群，如小麦的Galbitalea和玉米的Priestia，在NTS下富集。与CTS相比，RTS提高了小麦根际13C-SOC 65%，而NTS提高了玉米根际13C-SOC 99%，从而促进了根际沉积碳转移。此外，NTS促进了真菌群落的稳定和DOC的周转，共同促进了根沉积C的转移。优化作物专用耕作策略可以促进碳转移，改善土壤健康，减缓气候变化。

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来源期刊

Journal of Agricultural and Food Chemistry 农林科学-农业综合

CiteScore

9.90

自引率

8.20%

发文量

1375

审稿时长

2.3 months

期刊介绍： The Journal of Agricultural and Food Chemistry publishes high-quality, cutting edge original research representing complete studies and research advances dealing with the chemistry and biochemistry of agriculture and food. The Journal also encourages papers with chemistry and/or biochemistry as a major component combined with biological/sensory/nutritional/toxicological evaluation related to agriculture and/or food.