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中国农学通报

中国农学通报 ›› 2025, Vol. 41 ›› Issue (28): 78-86.doi: 10.11924/j.issn.1000-6850.casb2025-0101

• 资源·环境·生态·土壤·气象 • 上一篇    下一篇

典型水稻土不同有机碳组分对有机碳积累的响应

叶诚诚1(), 朱洁1, 李紫成1, 章明奎2()   

  1. 1 温州市植物保护与土壤肥料管理站，浙江温州 325000
    2 浙江大学环境与资源学院，杭州 310058
  • 收稿日期:2025-02-10 修回日期:2025-06-11 出版日期:2025-10-05 发布日期:2025-10-10
  • 通讯作者:
    章明奎，男，1964年出生，浙江绍兴人，教授，博士，主要从事土壤质量管理方面的研究。通信地址：310058 杭州市西湖区余杭塘路866号 浙江大学紫金港校区环境与资源学院，E-mail：。
  • 作者简介:

    叶诚诚，女，1994年出生，浙江平阳人，农艺师，硕士研究生，主要从事土壤肥料技术推广应用。通信地址：325000 浙江省温州市鹿城区九山路11号 农机大楼，E-mail：。

  • 基金资助:
    国家自然科学基金面上项目“亚热带小型海岛丘陵土壤的发生与空间分异及其土系建立的研究”(42271047)

Response of Different Organic Carbon Fractions to Organic Carbon Accumulation in Typical Paddy Soils

YE Chengcheng1(), ZHU Jie1, LI Zicheng1, ZHANG Mingkui2()   

  1. 1 Wenzhou Plant Protection and Soil Fertilizer Management Station, Wenzhou, Zhejiang 325000
    2 College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058
  • Received:2025-02-10 Revised:2025-06-11 Published:2025-10-05 Online:2025-10-10

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摘要： 为研究水稻土有机碳的积累特征及其与有机碳组分的关系，选择浙江省代表性的7种水稻土的表层土样，每种土壤采集25个样本，测定土壤有机碳的形态组成，分析游离有机碳、胡敏酸碳、富里酸碳和胡敏素碳等各形态有机碳对土壤碳积累的响应，探讨土壤有机碳的饱和机制。结果表明，随着土壤有机碳的积累，各类土壤中胡敏酸、富里酸、胡敏素碳和腐殖酸碳的含量均呈现先逐渐增加、后趋向平衡的变化趋势；达到平衡时，这些有机碳组分的含量与土壤黏粒、粉砂、无定形氧化铁含量呈正相关。而游离有机碳的含量随土壤有机碳的积累呈线性增加，且当土壤有机碳较高时，继续增加有机碳投入主要以积累游离有机碳为主。分析认为，土壤有机碳的饱和现象与有机碳的形态有关：与土壤无机组分密切结合的胡敏酸、富里酸、胡敏素碳和腐殖酸碳的积累受限于矿物吸附保护能力，其含量随着土壤有机碳的增加而增加，但当矿物吸附位点饱和时它们趋向平衡；而游离有机碳主要受有机物料输入量驱动，受土壤物理保护不明显，其随有机碳积累呈线性增长，饱和现象不明显。本研究揭示了不同形态有机碳组分对水稻土有机碳积累的不同贡献模式，为区域水稻土制定精准的有机物料投入与土壤培肥策略提供了理论依据，同时也为水稻土的可持续管理提供了科学参考。

关键词: 水稻土, 有机碳, 腐殖质碳, 响应, 饱和值

Abstract:

To investigate the characteristics of soil organic carbon accumulation and its relationship with organic carbon fractions, 25 surface soil samples from each of 7 representative paddy fields (paddy soils) in Zhejiang Province were selected to determine the composition of different soil organic carbon forms. The response of each form of organic carbon to soil carbon accumulation was analyzed, and the saturation mechanism of soil organic carbon accumulation was explored. The results showed that with the accumulation of soil organic carbon, the content of humic acid, fulvic acid, humic acid carbon and humic acid carbon in various types of the soils showed an initial increase followed by a trend towards equilibrium. The content of these organic carbon components at equilibrium was positively correlated with the content of soil clay, silt and amorphous iron oxide. Free organic carbon increased linearly with the accumulation of soil organic carbon, and continued to increase when the soil organic carbon was at high level. In this case, the accumulated organic carbon in the soils was mainly in the form of free organic carbon. Results suggested that the saturation phenomenon of soil organic carbon was related to the form of organic carbon. The accumulation of humic acid, fulvic acid, humin carbon, and humic acid carbon closely associated with soil inorganic components was limited by the ability of mineral adsorption protection, and their contents increased with the increase of total soil organic carbon, but they tended to equilibrium when the mineral adsorption sites were saturated. The free organic carbon, mainly driven by the input amount of organic matter, was not obviously affected by soil physical protection, and it increased linearly with the accumulation of organic carbon, and its saturation phenomenon was not obvious. This study reveals the different contribution patterns of different forms of organic carbon components to the accumulation of organic carbon in paddy soil, which provides a theoretical basis for the development of accurate organic material input and soil fertilization strategies for regional paddy soil, and also provides a scientific reference for the sustainable management of paddy soil.

Key words: paddy soil, organic carbon, humus carbon, response, saturation value