Effects of Nitrogen Deposition on Sequestration of Carbon in Mycorrhizal Fungi

在全球范围内，菌根真菌可能在其活组织和死组织中通过产生顽固化合物（如几丁质和球囊素）来隔离大量的碳。Treseder博士和他的同事们将验证这样一个假设，即土壤中氮含量的增加会减少菌根物质中营养物质的固定，因为添加氮可能会减少菌根的生长，但会增加死亡率和死亡组织的分解。如果是这样的话，增加氮沉降可能会减少土壤碳储量，并加速目前大气中二氧化碳水平的上升。研究人员将采用实地和实验室技术来评估氮肥对菌根碳的影响。这些发现将在氮沉降与大气二氧化碳升高之间潜在相互作用的背景下进行评估，并可能对自然和农业生态系统产生影响

Abstract 0107776 Treseder Globally, mycorrhizal fungi are likely to sequester a substantial amount of carbon in their living and dead tissues and through the production of recalcitrant compounds such as chitin and glomalin. Dr. Treseder and colleagues will test the hypothesis that increases in nitrogen availability in soils will reduce the immobilization of nutrients in this mycorrhizal material, because nitrogen additions may decrease mycorrhizal growth but increase death rates and decomposition of dead tissue. If this is the case, increasing nitrogen deposition could reduce soil carbon storage and accelerate the current rise in atmospheric CO2 levels. The investigators will employ field and laboratory techniques to assess the effects of nitrogen fertilization on mycorrhizal carbons. The findings will be evaluated in the context of potential interactions between nitrogen deposition and elevated atmospheric CO2, and with possible implications for natural and agricultural ecosystems