环境科学
土壤呼吸
土壤碳
碳循环
土壤有机质
碳汇
横断面
总有机碳
碳纤维
气候变化
地质学
生态系统
土壤水分
土壤科学
环境化学
海洋学
生态学
化学
复合数
复合材料
生物
材料科学
作者
Sebastian Doetterl,Antoine Stevens,Johan Six,Roel Merckx,Kristof Van Oost,Manuel Casanova,Angélica Casanova-Katny,Cristina Muñoz,Mathieu Boudin,Erick Zagal,Pascal Boeckx
摘要
Rising temperature can increase soil organic matter decomposition and CO2 emissions. In a 4,000 km north–south transect in Chile and Antarctica, soil geochemistry, which can be modified by climate, is the dominant direct control of carbon storage. Soils are an important site of carbon storage1. Climate is generally regarded as one of the primary controls over soil organic carbon1,2, but there is still uncertainty about the direction and magnitude of carbon responses to climate change. Here we show that geochemistry, too, is an important controlling factor for soil carbon storage. We measured a range of soil and climate variables at 24 sites along a 4,000-km-long north–south transect of natural grassland and shrubland in Chile and the Antarctic Peninsula, which spans a broad range of climatic and geochemical conditions. We find that soils with high carbon content are characterized by substantial adsorption of carbon compounds onto mineral soil and low rates of respiration per unit of soil carbon; and vice versa for soils with low carbon content. Precipitation and temperature were only secondary predictors for carbon storage, respiration, residence time and stabilization mechanisms. Correlations between climatic variables and carbon variables decreased significantly after removing relationships with geochemical predictors. We conclude that the interactions of climatic and geochemical factors control soil organic carbon storage and turnover, and must be considered for robust prediction of current and future soil carbon storage.
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