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Mineral Availability as a Key Regulator of Soil Carbon Storage

  • [设施]:上海光源
  • [期刊/会议名称]:Environ. Sci. Technol.
  • [摘要]:Mineral binding is a major mechanism for soil carbon (C) stabilization, and mineral availability for C binding critically affects C storage. Yet, the mechanisms regulating mineral availability are poorly understood. Here, we showed that organic amendments in three long-term (23, 154, and 170 yrs, respectively) field experiments significantly increased mineral availability, particularly of short-range-ordered (SRO) phases. Two microcosm studies demonstrated that the presence of roots significantly increased mineral availability and promoted the formation of SRO phases. Mineral transformation experiments and isotopic labeling experiments provided direct evidence that citric acid, a major component of root exudates, promoted the formation of SRO minerals, and that SRO minerals acted as “nuclei” for C retention. Together, these findings indicate that soil organic amendments initialize a positive feedback loop by increasing mineral availability and promoting the formation of SRO minerals for further C binding, thereby possibly serving as a management tool for enhancing carbon storage in soils.
  • [发表日期]:2017
  • [第一作者]:Guanghui Yu
  • [第一作者单位]:南京农业大学
  • [通讯作者]:Qirong Shen
  • [通讯作者单位]:南京农业大学
  • [论文类型]:0
  • [期刊分类]:SCI2区
  • [学科分类]:环境科学_生态学
  • [影响因子]:6.19
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