Quality of fresh organic matter affects priming of soil organic matter and substrate utilization patterns of microbes

摘要: Changes in biogeochemical cycles and the climate system due to human activities are expected change quantity quality of plant litter inputs soils. How changing fresh organic matter (FOM) might influence priming effect (PE) on soil (SOM) mineralization is still under debate. Here we determined PE induced by two 13C-labeled FOMs with contrasting nutritional (leaf vs. stalk Zea mays L.). Soils from different forest types yielded consistent results: soils amended leaf tissue switched faster negative positive greater microbial growth compared stalks. However, after 16 d incubation, stalks had a higher than those leaf. Phospholipid fatty acid (PLFA) results suggested that demand for carbon other nutrients was one major determinants observed. Therefore, consideration both demands FOM supply simultaneously essential understand underlying mechanisms PE. Our study provided evidence changes could affect utilization substrate SOM mineralization, which may exacerbate global warming problems future change.