Turnover Rates and Sizes of Soil Organic Matter Pools in Surface Soils

表层土壤有机质库的周转率和规模

• 批准号: 9306944
• 负责人: Yuch-Ping Hsieh
• 金额: $ 7.03万
• 依托单位: Florida Agricultural and Mechanical University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-11-01 至 1994-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9306944&HistoricalAwards=false
• 关键词: Turnover; Rates; Sizes; Soil; Organic

9306944 Hsieh Determination of turnover times and sizes of soil organic matter (SOM) pools has been one of the major problems in SOM dynamics studies because of the limitations of the current techniques. Recently developed radiocarbon methods seem to provide a solution to the problems. These methods take advantage of the residual bomb 14C (14C = carbon 14) effect in the atmosphere to determine the turnover times and sizes of active and stable SOM pools. The time window for applying these radiocarbon methods is rather narrow now: perhaps scientist have only a decade or so to do the job. The author also proposes to collect and preserve as many soil samples as possible while the residual bomb 14C effect is still significant. %%% Those samples will be an irreplaceable and treasured resource for future studies in SOM dynamics. The results of this proposed work will provide a great wealth of information on the role of SOM to carbon and nutrient cycling of many ecosystems. They will also provide needed data for modeling studies of the global carbon cycle.

由于现有技术的局限性，确定土壤有机质库的周转时间和大小一直是土壤有机质动态研究中的主要问题之一。 最近开发的放射性碳方法似乎提供了一个解决问题的方法。 这些方法利用大气中的残留弹14C（14C =碳14）效应来确定活跃和稳定的SOM库的周转时间和大小。 现在应用放射性碳方法的时间窗口相当狭窄：也许科学家只有十年左右的时间来做这项工作。 作者还建议在残留弹14C效应仍然显著的情况下，尽可能多地采集和保存土壤样品。 这些样品将是未来SOM动态研究中不可替代的宝贵资源。 这项工作的结果将提供一个非常丰富的信息的作用SOM碳和养分循环的许多生态系统。 它们还将为全球碳循环的建模研究提供所需的数据。