LTREB: Long-Term Soil Organic Matter Dynamics in Subtropical Agroecosystems

LTREB：亚热带农业生态系统中的长期土壤有机质动态

• 批准号: 9629770
• 负责人: Paul Hendrix
• 金额: $ 26万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-08-01 至 2002-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9629770&HistoricalAwards=false
• 关键词: LTREB; Long; Term; Soil; Organic

9629770 Hendrix Since 1978, long-term research has been conducted on the effects of tillage regimes and the impacts of biotic manipulations on soil organic matter (SOM) dynamics and nutrient cycling processes in a subtropical agroecosystem. After 15 years of conventional tillage and no tillage management, dynamics of water-stable aggregates and aggregate-associated soil organic matter have been described and monitored at the Horseshoe Bend experimental area at the University of Georgia. The formation and stabilization of macroaggregates in no tillage soils represents an important mechanism for the protection and maintenance of SOM that may otherwise be lost under conventional tillage practices. This mechanism may explain the nearly 18% higher soil organic matter content of no tillage soils as compared to conventional tillage soils. These differences in SOM are translated to changes in soil biodiversity and ecosystem functioning. Funding of this LTREB proposal will maintain these long-term experiments, and allow several short-term, mechanistic field experiments to be conducted. The dynamics of soil organic matter and the response by the soil community to these dynamics take place over decades. LTREB funding will allow these investigators the appropriate time frame to monitor these dynamics.

自1978年以来，人们对亚热带农业生态系统耕作制度和生物调控对土壤有机质动态和养分循环过程的影响进行了长期研究。经过15年的传统耕作和免耕管理，在乔治亚大学马蹄弯实验区对水稳性团聚体和团聚体相关土壤有机质的动态进行了描述和监测。免耕土壤中大团聚体的形成和稳定是保护和维持土壤有机质的重要机制，而传统耕作可能会使土壤有机质流失。这一机制可以解释免耕土壤有机质含量比常规耕作土壤高近18%的原因。土壤有机质的这些差异转化为土壤生物多样性和生态系统功能的变化。这项LTREB提案的资金将维持这些长期实验，并允许进行一些短期的机械实地实验。土壤有机质的动态和土壤群落对这些动态的响应发生在几十年的时间里。LTREB的资金将使这些调查人员有适当的时间框架来监测这些动态。