ROW: Timing of Nutrient Mineralization from Leaf Litter: Internal Cycling by Fungi

ROW：落叶中养分矿化的时间：真菌的内部循环

• 批准号: 9007897
• 负责人: D. Jean Lodge
• 金额: $ 1.79万
• 依托单位: University of Puerto Rico
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-05-15 至 1991-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9007897&HistoricalAwards=false
• 关键词: ROW; Timing; Nutrient; Mineralization; Leaf

The objective of this research project is to test whether leaf- decomposing fungi short-circuit phosphorus mineralization in a phosphorus-depauperate tropical rainforest. A microcosm experiment is planned to determine if fungi can export 32P from partially decomposed leaves into fresh litter. Fungal transport from old litter could explain previously observed increased in P above 100% of the initial amount during early stages of leaf decomposition. If mineralization of phosphorus from litter is bypassed because of internal recycling by decomposer fungi the availability of P to plant roots may be restricted. In some phosphorus and nitrogen depauperate ecosystems, nutrients sequestered in fungal biomass may become available to higher plants when fungal populations crash. Future objectives will include the determination of timing of nutrient mineralization from fungal biomass as it may be controlled by wetting and drying cycles and fungivorous microarthropods. Results of this research should have implications for the management of tropical forest ecosystems as well as for the fundamental ecological understanding of those systems. The principal investigator is well motivated and supported by knowledgeable colleagues. Institutional facilities and accommodation are adequate to the research.

本研究的目的是测试腐叶真菌是否在缺磷热带雨林中短路磷矿化。计划进行一个微观实验，以确定真菌是否能从部分腐烂的叶片中输出32P到新鲜凋落物中。旧凋落物的真菌运输可以解释先前观察到的P在叶片分解早期增加超过100%的初始量。如果由于分解真菌的内部循环而绕过了凋落物中磷的矿化，则植物根系对磷的可利用性可能受到限制。在一些磷和氮缺乏的生态系统中，当真菌种群崩溃时，真菌生物量中隔离的营养物质可能会被高等植物利用。未来的目标将包括确定真菌生物量营养矿化的时间，因为它可能由湿润和干燥循环以及食真菌的微节肢动物控制。这项研究的结果将对热带森林生态系统的管理以及对这些系统的基本生态认识产生影响。首席研究员受到知识渊博的同事的积极激励和支持。研究机构的设施和住宿是足够的。