Long-term cereal-legume intercropping accelerates soil organic carbon loss in subsoil of dryland

IF 11.2 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Resources Conservation and Recycling Pub Date : 2024-09-04 DOI:10.1016/j.resconrec.2024.107898

引用次数: 0

Abstract

Subsoils are important reservoirs affecting soil organic carbon (SOC). However, little is known about the factors controlling SOC pools in subsoils, and the response of SOC stability to sustainable cropping patterns (e.g., intercropping) remains to be determined. A 10-year experimental field experiment data indicated that cereal–legume intercropping improved net yield gain averagely by 2.2–4.9 t ha^-1. SOC storage increased in the topsoil but declined significantly by 5.3% in the subsoil. The increase in soil nitrogen (13.3%) across soil profile resulted in 14.5% decrease in soil C/N. Unexpectedly, microbial growth was evidently stimulated, thereby accelerating SOC decomposition. Interestingly, this process also contributed to the stability of the existing SOC pool. Our results suggest that the adoption of intercropping indeed can improve land use efficiency at a relatively long time scale, but its functional role in subsoil C storage and stability needs to be reconsidered.

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长期谷物-豆类间作会加速旱地底土中土壤有机碳的流失

底土是影响土壤有机碳（SOC）的重要储存库。然而，人们对控制底土中 SOC 库的因素知之甚少，而且 SOC 的稳定性对可持续种植模式（如间作）的响应仍有待确定。一项为期 10 年的田间试验数据表明，谷物-豆类间作平均每公顷净增产 2.2-4.9 吨。表土中的 SOC 储存量增加了，但底土中的 SOC 储存量却显著下降了 5.3%。整个土壤剖面中土壤氮的增加（13.3%）导致土壤碳/氮下降 14.5%。意想不到的是，微生物生长明显受到刺激，从而加速了 SOC 的分解。有趣的是，这一过程也有助于现有 SOC 池的稳定。我们的研究结果表明，采用间作的确可以在相对较长的时间尺度上提高土地利用效率，但其在底土碳储存和稳定性方面的功能作用还需要重新考虑。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Resources Conservation and Recycling 环境科学-工程：环境

CiteScore

22.90

自引率

6.10%

发文量

625

审稿时长

23 days

期刊介绍： The journal Resources, Conservation & Recycling welcomes contributions from research, which consider sustainable management and conservation of resources. The journal prioritizes understanding the transformation processes crucial for transitioning toward more sustainable production and consumption systems. It highlights technological, economic, institutional, and policy aspects related to specific resource management practices such as conservation, recycling, and resource substitution, as well as broader strategies like improving resource productivity and restructuring production and consumption patterns. Contributions may address regional, national, or international scales and can range from individual resources or technologies to entire sectors or systems. Authors are encouraged to explore scientific and methodological issues alongside practical, environmental, and economic implications. However, manuscripts focusing solely on laboratory experiments without discussing their broader implications will not be considered for publication in the journal.