Climate warming plays an important role in dissolved organic carbon loss in deep soil layers across China

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2025-08-29 DOI:10.1016/j.catena.2025.109404

Lingli Yu , Mingxu Li , Xiaoyan Kang , Li Xu , Boming Liang , Jiankun Chen , Youbin Deng , Xuanbo Wang , Xuyang Zhang , Mengze Qin , Changhui Peng , Nianpeng He

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Abstract

Dissolved organic carbon (DOC) is one of the most dynamic components of the soil carbon pool. Clarifying its response to climate warming is essential for understanding global carbon cycling processes and predicting future soil carbon pool changes. Using a national database of 4,789 soil DOC profiles covering different soil depths (0–30 cm, 30–100 cm) and ecosystems (forest, grassland, cropland, and wetland), we comprehensively assessed soil DOC content spatiotemporal dynamics across China and the response to climate warming. The results showed significant spatial heterogeneity in the soil DOC of China; high topsoil DOC contents were mainly distributed in low-temperature and dry regions, but high subsoil DOC contents were more concentrated in low-temperature regions. From 1982 to 2020, the topsoil DOC content showed no significant changes (R² = 0.02, p > 0.05), whereas the subsoil DOC content significantly decreased by approximately 4 % (R² = 0.66, p < 0.01). The negative response of the subsoil DOC to temperature was the primary reason for this significant decline. In comparison, the topsoil DOC content remained stable, which could be attributed to the balance between production and consumption. These findings clarify the response patterns of soil DOC to climate warming and indicate that continued DOC reductions could exacerbate soil carbon pool instability and accelerate its feedback effects on climate change.

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气候变暖对中国深层土壤溶解有机碳的损失具有重要影响

溶解有机碳（DOC）是土壤碳库中最具活力的组成部分之一。阐明其对气候变暖的响应对于理解全球碳循环过程和预测未来土壤碳库变化至关重要。利用覆盖不同土壤深度（0 ~ 30 cm、30 ~ 100 cm）和不同生态系统（森林、草地、农田和湿地）的4789个土壤DOC剖面，综合评价了中国土壤DOC含量的时空动态及其对气候变暖的响应。结果表明：中国土壤DOC具有显著的空间异质性；表层土壤DOC含量高的地区主要分布在低温干燥地区，而底土DOC含量高的地区主要集中在低温地区。1982 ~ 2020年，表层土壤DOC含量变化不显著（R2 = 0.02, p > 0.05），而底土DOC含量显著下降约4% （R2 = 0.66, p < 0.01）。土壤DOC对温度的负响应是造成这种显著下降的主要原因。相比之下，表层土壤DOC含量保持稳定，这可归因于生产与消费的平衡。这些结果阐明了土壤DOC对气候变暖的响应模式，表明持续减少DOC会加剧土壤碳库的不稳定性，加速其对气候变化的反馈效应。

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

Catena 环境科学-地球科学综合

CiteScore

10.50

自引率

9.70%

发文量

816

审稿时长

54 days

期刊介绍： Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.