Effects of Nitrogen Deposition on Sequestration of Carbon in Mycorrhizal Fungi

摘要0107776在全球范围内，菌根真菌可能会在其活的和死亡的组织中隔离大量的碳，并通过产生顽固的化合物，如甲壳素和谷氨酚。特雷塞德博士和他的同事们将检验这一假设，即土壤中氮素有效性的增加将减少这种菌根材料中营养物质的固定，因为添加氮素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，增加氮沉降量可能会减少土壤碳储量，加速目前大气二氧化碳水平的上升。研究人员将利用田间和实验室技术来评估氮肥对菌根碳的影响。这些发现将在氮沉积和大气二氧化碳升高之间的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