| DOI: | 10.2172/1015558
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| 报告号: | DOE/ER--63912
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| 报告题名: | Physico-chemical and Bio-chemical Controls on Soil C Saturation Behavior |
| 作者: | Baliga, Nitin S
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| 出版年: | 2011
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| 发表日期: | 2011-05-31
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| 总页数: | 11
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| 国家: | 美国
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| 语种: | 英语
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| 英文关键词: | carbon sequestration
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| 中文主题词: | 土壤
; 碳
; 有机物
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| 主题词: | SOILS
; CARBON
; ORGANIC MATTER
|
| 英文摘要: | In this project, we tested through a multitude of lab and field experiments the concept of soil C stabilization and determined metrics for the level of C saturation across soils and soil organic matter fractions. The basic premise of the soil C saturation concept is that there is a maximum amount of C that can be stabilized within a soil, even when C input is further increased. In a first analysis, our results showed that linear regression models do not adequately predict maximal organic C stabilization by fine soil particles. Soil physical and chemical properties associated with soil clay mineralogy, such as specific surface area and organic C loading, should be incorporated into models for predicting maximal organic C stabilization. In a second analysis, we found significantly greater maximal C stabilization in the microaggregate-protected versus the non-microaggregate protected mineral fractions, which provides independent validation that microaggregation plays an important role in increasing the protection and stabilization of soil C leading to greater total soil C accumulation in these pools. In a third study, our results question the role of biochemical preference in mineral C stabilization and of the chemical recalcitrance of specific plant-derived compounds in non-protected soil C accumulation. Because C biochemical composition of slowly turning over mineral protected C pools does not change with C saturation, input C composition is unlikely to affect long-term C stabilization. Rather, C saturation and stabilization in soil is controlled only by the quantity of C input to the soil and the physical and chemical protection mechanisms at play in long-term C stabilization. In conclusion, we have further corroborated the concept of soil C saturation and elucidated several mechanisms underlying this soil C saturation. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1015558
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| Citation statistics: |
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/40220
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| 1015558.doc（498KB） | 研究报告 | -- | 开放获取 | | View
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| Recommended Citation: | |
Baliga, Nitin S. Physico-chemical and Bio-chemical Controls on Soil C Saturation Behavior. 2011-01-01.
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