Rice paddy soils are a quantitatively important carbon store according to a global synthesis
Rice paddy soils are a quantitatively important carbon store according to a global synthesis
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根据全球综合数据，稻田土壤是一种重要的碳储存库
DOI：
10.1038/s43247-021-00229-0
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发表时间：
2021-08-06
影响因子：
7.9
通讯作者：
Kuzyakov, Yakov
中科院分区：
文献类型：
--
作者：
Liu, Yalong;Ge, Tida;Kuzyakov, Yakov
稻田约占世界耕地面积的9%，其特点是环境条件促进土壤有机碳储存、甲烷排放和较小程度的一氧化二氮排放。在这里，我们综合了来自51个国家612个地点的数据，以估计全球水稻土碳储量，并确定影响水稻土碳储量的主要因素。全世界水稻土（0-100 cm）含碳量为18 Pg。稻田土壤碳储量随年平均温度和土壤pH值的升高而降低，而年平均降水量和粘粒含量的影响较小。荟萃分析表明，水稻土碳储量可以通过几种管理措施增加。然而，甲烷和一氧化二氮排放量的增加通常超过了通过稻田土壤碳储存减少温室气体的作用。我们的研究结果强调了稻田在全球碳循环中的关键作用，以及稻田管理在最大限度地减少人为温室气体排放方面的重要性。
Rice paddies account for similar to 9% or the world's cropland area and are characterized by environmental conditions promoting soil organic carbon storage, methane emissions and to a lesser extent nitrous oxide emissions. Here, we synthesize data from 612 sites across 51 countries to estimate global carbon stocks in paddy soils and determine the main factors affecting paddy soil carbon storage. Paddy soils (0-100 cm) contain 18 Pg carbon worldwide. Paddy soil carbon stocks decrease with increasing mean annual temperature and soil pH, whereas mean annual precipitation and clay content had minor impacts. Meta-analysis shows that paddy soil carbon stocks can be increased through several management practices. However, greenhouse gas mitigation through paddy soil carbon storage is generally outweighed by increases in methane and nitrous oxide emissions. Our results emphasize the key role of paddies in the global carbon cycle, and the importance of paddy management in minimizing anthropogenic greenhouse gas emissions.