中国水田通过长期种植水稻积累了大量土壤有机碳。

IF 10.8 1区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION
Xiaomin Yang, Zhaoliang Song, Lukas Van Zwieten, Laodong Guo, Ji Chen, Zhongkui Luo, Yidong Wang, Yu Luo, Zhengang Wang, Weiqi Wang, Jingxu Wang, Yu Wang, Cong-Qiang Liu, Hailong Wang
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引用次数: 0

摘要

水稻田是重要的土壤有机碳(SOC)库,其陆地碳(C)固存潜力与 SOC 库的变化密切相关。然而,在广泛的地理范围内,对水稻长期种植后 SOC 库的变化进行量化的综合研究还很缺乏。我们利用中国各地自 20 世纪 80 年代以来持续种植水稻的 104 个水稻田取样点,研究了表层土壤(0-20 厘米)可溶性有机碳(LOC I)、半可溶性有机碳(LOC II)、难降解有机碳(ROC)和总 SOC 的变化。我们发现,从 20 世纪 80 年代到 2010 年代,中国水田中总 SOC 的含量(48%)和密度(39%)都有大幅增加。有趣的是,ROC 含量和密度的增加速度超过了 LOC(I 和 II)。利用结构方程模型,我们发现总 SOC 含量和密度的变化主要是由 ROC 的相应变化驱动的,而 ROC 的变化直接或间接地受到气候和土壤理化因素的影响,尤其是温度、降水、磷(P)和粘土含量。我们还发现,δ13 CLOC 大于δ13 CROC,这与水稻种植区域无关,而且δ13 CSOC 与 δ13 Cstraw 之间存在显著的正相关。δ13CLOC和δ13CSOC与土壤总硅呈显著负相关,表明土壤硅在碳向不同SOC池的分配、周转或稳定中起着一定的作用。我们的研究强调,水稻田的全球固碳量主要来源于 ROC 池的大幅增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Significant accrual of soil organic carbon through long-term rice cultivation in paddy fields in China

Significant accrual of soil organic carbon through long-term rice cultivation in paddy fields in China

Paddy fields serve as significant reservoirs of soil organic carbon (SOC) and their potential for terrestrial carbon (C) sequestration is closely associated with changes in SOC pools. However, there has been a dearth of comprehensive studies quantifying changes in SOC pools following extended periods of rice cultivation across a broad geographical scale. Using 104 rice paddy sampling sites that have been in continuous cultivation since the 1980s across China, we studied the changes in topsoil (0–20 cm) labile organic C (LOC I), semi-labile organic C (LOC II), recalcitrant organic C (ROC), and total SOC. We found a substantial increase in both the content (48%) and density (39%) of total SOC within China's paddy fields between the 1980s to the 2010s. Intriguingly, the rate of increase in content and density of ROC exceeded that of LOC (I and II). Using a structural equation model, we revealed that changes in the content and density of total SOC were mainly driven by corresponding shifts in ROC, which are influenced both directly and indirectly by climatic and soil physicochemical factors; in particular temperature, precipitation, phosphorous (P) and clay content. We also showed that the δ13CLOC were greater than δ13CROC, independent of the rice cropping region, and that there was a significant positive correlation between δ13CSOC and δ13Cstraw. The δ13CLOC and δ13CSOC showed significantly negative correlation with soil total Si, suggesting that soil Si plays a part in the allocation of C into different SOC pools, and its turnover or stabilization. Our study underscores that the global C sequestration of the paddy fields mainly stems from the substantial increase in ROC pool.

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来源期刊
Global Change Biology
Global Change Biology 环境科学-环境科学
CiteScore
21.50
自引率
5.20%
发文量
497
审稿时长
3.3 months
期刊介绍: Global Change Biology is an environmental change journal committed to shaping the future and addressing the world's most pressing challenges, including sustainability, climate change, environmental protection, food and water safety, and global health. Dedicated to fostering a profound understanding of the impacts of global change on biological systems and offering innovative solutions, the journal publishes a diverse range of content, including primary research articles, technical advances, research reviews, reports, opinions, perspectives, commentaries, and letters. Starting with the 2024 volume, Global Change Biology will transition to an online-only format, enhancing accessibility and contributing to the evolution of scholarly communication.
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