冀北山区云杉林生态系统土壤有机碳矿化研究

Soil Organic Carbon Mineralization in Spruce Forest Ecosystem in Northern Hebei Mountain Area

摘要: 森林生态系统中土壤有机碳的矿化作用是陆地生态系统有机碳循环的重要组成部分，对全球气候变化也有着至关重要的影响。本研究以云杉林的土壤作为研究对象，并且对0~10 cm和10~20 cm土层深度上的土壤进行室内矿化培养实验，研究不同季节和不同土层深度对土壤有机碳的矿化影响并利用一级动力学模型对土壤有机碳矿化进程进行模拟。研究结果表明，不同季节云杉林各坡位土壤不同土层深度土壤有机碳的矿化速率呈现不同规律，但是无明显差别。土壤有机碳矿化速率和累积矿化量表现为冬季最高，夏季最低。云杉林夏季的土壤矿化潜力C₀最低，秋季的C₀/SOC最高，因此秋季对应的土壤碳库更加不稳定，表层土壤的矿化潜力高于深层土壤。

Abstract: The mineralization of soil organic carbon in forest ecosystem is an important part of the organic carbon cycle in terrestrial ecosystem and has a crucial impact on global climate change. In this study, the soil of spruce forest was taken as the research object, and the soil at 0~10 cm and 10~20 cm depth was cultured in laboratory. The effects of different seasons and depths on soil organic carbon mineralization were studied, and the process of soil organic carbon mineralization was simulated by first-order dynamic model. The results showed that different soil depths had signifi-cant differences in soil organic carbon mineralization, and the mineralization rate and cumulative amount of soil organic carbon were higher in surface soil than in deep soil. The soil organic carbon mineralization rate and cumulative amount of soil organic carbon mineralization were the highest in winter and the lowest in summer. The soil mineralization potential of spruce forest was the lowest in summer, and the corresponding soil carbon pool was more unstable in autumn. The mineralization potential of surface soil was higher than that of deep soil.