Doctoral Dissertation: Soil Organic Carbon Following Deforestation in a Spatially Variable Tropical Landscape

最近的研究表明，热带地区森林砍伐后土壤有机碳库的变化方向、幅度和速率取决于初始土壤条件和立地因子。然而，对土地利用变化引起的土壤有机碳氧化引起的CO2通量的大多数全球或大陆尺度评估都假定土壤有机碳衰变的平均速率。为了评估地理变化在森林砍伐后调节土壤碳动态中的作用，pi将量化碳库变化与场地因素（如土壤年龄和质地、气候、场地生产力、土地利用历史和哥斯达黎加景观的初始条件）之间的关系。这些研究将深入了解土地利用变化后影响土壤碳动态的过程、地理变异对大规模碳清单的重要性，以及将精细尺度信息纳入大规模评估的改进方法。

99-72569Schlesinger / PowersDDIG: Soil organic carbon following deforestation in a spatially variable tropical landscapeRecent studies have suggested that the direction, magnitude, and rate of change in soil organic carbon pools following deforestation in the tropics are dependent upon initial soil conditions and site factors. However, most global or continental-scale assessments of the flux of CO2 due to soil organic carbon oxidation with land-use change assume an average rate of soil organic carbon decay. To assess the role of geographic variation in mediating soil carbon dynamics following forest clearing, the PIs will quantify the relationship between changes in carbon pools and site factors such as soil age and texture, climate, site productivity, land-use history, and initial conditions for a well-studied landscape in Costa Rica. These studies will provide insights into the processes influencing soil carbon dynamics following land-use change, the importance of geographic variability to large-scale carbon inventories, and improved methods for incorporating fine-scale information into large-scale assessments.