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中国农学通报 ›› 2021, Vol. 37 ›› Issue (21): 98-105.doi: 10.11924/j.issn.1000-6850.casb2020-0558

所属专题: 资源与环境

• 资源·环境·生态·土壤·气象 • 上一篇    下一篇

石灰施用对酸性土壤矿物结合有机碳形成的影响

吴彬1(), 徐晶晶1, 成艳红2, 叶成龙1(), 胡水金1,3   

  1. 1南京农业大学资源与环境科学学院,南京 210095
    2江西省红壤研究所,江西进贤 331717
    3北卡罗来纳州立大学昆虫和植物病理学系,罗利 27695
  • 收稿日期:2020-10-15 修回日期:2020-12-16 出版日期:2021-07-25 发布日期:2021-07-29
  • 通讯作者: 叶成龙
  • 作者简介:吴彬,男,1997年出生,江苏盐城人,在读硕士,研究方向:全球变化与土壤有机碳动态。通信地址:210095 江苏省南京市玄武区卫岗一号 南京农业大学卫岗校区,Tel:025-84399759,E-mail: 2019103009@njau.edu.cn
  • 基金资助:
    国家重点研发计划“碳循环关键过程机理研究的技术标准和方法”(2017YFC0503902);博士后创新人才支持计划“气候变暖背景下高寒草甸凋落物分解转化为土壤有机碳的过程机理研究”(BX20200169)

Effects of Liming on Formation of Mineral-associated Organic Carbon in Acidic Soil

Wu Bin1(), Xu Jingjing1, Cheng Yanhong2, Ye Chenglong1(), Hu Shuijin1,3   

  1. 1College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095
    2Red Soil Institute of Jiangxi Province, Jinxian Jiangxi 331717
    3Department of Entomology and Plant Pathology, North Carolina State University, Raleigh 27695
  • Received:2020-10-15 Revised:2020-12-16 Online:2021-07-25 Published:2021-07-29
  • Contact: Ye Chenglong

摘要:

为了解石灰施用对酸性土壤矿物结合有机碳的影响并促进酸性土壤的碳固定,本研究整合已发表的相关研究并在室内设置培养试验探究石灰添加调控酸性红壤矿物结合有机碳形成的可能机制。结果表明:大部分已发表的研究发现石灰添加可以显著促进酸性土壤中矿物结合有机碳的形成。室内控制试验发现石灰添加显著促进了秸秆分解转化为微生物生物量碳,这很可能是石灰促进矿物结合碳形成的主要机制之一。室内控制试验还发现石灰添加增加了钙键结合碳的含量,但是降低了铁铝结合碳的含量。综上可知,石灰添加有利于作物秸秆在酸性土壤中被微生物分解转化为矿物结合有机碳,但可能会导致不同化学键结合碳的相对含量发生变化。

关键词: 酸化, 石灰, 微生物活性, 矿物结合有机碳, 秸秆添加

Abstract:

To understand how liming affects mineral-associated organic carbon (C) and promote organic C sequestration in acidic soils, the authors synthesized the published data in the literature and conducted a laboratory incubation to explore the potential mechanism of mineral-associated C formation in response to liming in acidic soils. The results showed that liming promoted the formation of mineral-associated organic C in most published studies. Our laboratory incubation experiment found that liming significantly promoted straw decomposition and increased microbial biomass C, which could be one of the main mechanisms that contribute to the formation of mineral-associated C. In addition, our laboratory incubation also found that liming reduced the formation of iron/aluminum-bound C, while it promoted the formation of calcium-bound C. Together, these results suggested that the application of lime in acidic soils could promote the formation of mineral-associated organic C, but might change the relative contents of organic C associated with different chemical bonds.

Key words: acidification, lime, microbial activity, mineral-associated carbon, straw incorporation

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