Controls on the Storage and Loss of Soil Organic Carbon with Reforestation of Abandoned Pastures

废弃牧场重新造林对土壤有机碳储存和流失的控制

• 批准号: 0129104
• 负责人: Whendee Silver
• 金额: $ 37.5万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-03-15 至 2006-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0129104&HistoricalAwards=false
• 关键词: Controls; Storage; Loss; Soil; Organic

At a global scale, soil carbon storage generally increases with clay content, and carbon loss via soil respiration can be relatively well predicted from mean annual temperature and rainfall. At an ecosystem scale, the mechanisms responsible for C retention and loss are less well understood. This study will use a long-term and well-replicated pasture-to-forest chronosequence to study the factors that contribute to soil C storage and loss. The research will follow C from plant litter inputs through decomposition to storage in soils, and loss via CO2. Chemical properties of plant tissues change during secondary succession, and thus the impact of the litter chemistry on ecosystem processes is also likely to change over time. The research will use field and laboratory experiments and stable- and radioisotopes to compare and contrast the roles of litter chemistry, above- and belowground litter inputs, and soil chemical properties in belowground C cycling over 82 yr of reforestation. This research will contribute to understanding of how plants influence soil C dynamics, and improve the ability to predict the effects of reforestation and afforestation on C sequestration.

在全球范围内，土壤碳的储存通常随粘土含量而增加，并且通过平均年温度和降雨量可以很好地预测土壤呼吸的碳丢失。 在生态系统量表上，负责C保留和损失的机制知之甚少。 这项研究将使用长期且重复良好的牧场到森林月度序列来研究有助于土壤C储存和损失的因素。 该研究将遵循C从植物垃圾输入到分解到土壤中的储存，再到二氧化碳的损失。 植物组织的化学特性在继任过程中发生变化，因此垃圾化学对生态系统过程的影响也可能随着时间而变化。 这项研究将使用现场和实验室实验以及稳定和放射性同位素来比较和对比垃圾化学，地下和下地下垃圾输入的作用，以及地下C循环中的土壤化学特性，超过82年的重新造林。 这项研究将有助于理解植物如何影响土壤C动力学，并提高预测造林和造林对C隔离的影响的能力。