Dissertation Research: Is Decomposition in Moist Tropical Forests Phosphorus Limited?

论文研究：潮湿热带森林中磷的分解有限吗？

• 批准号: 0104819
• 负责人: Alan Townsend
• 金额: $ 0.88万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-06-01 至 2002-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0104819&HistoricalAwards=false
• 关键词: Dissertation; Research; Decomposition; Moist; Tropical

Despite a widespread belief that phosphorus (P) availability poses a strong constraint on ecosystem dynamics in tropical forests, direct tests of this belief are rare. Furthermore, most studies that have addressed this issue have focused on P limitation to the plant community; virtually none have addressed the possibility that the microbial community is P limited. Mr. Cleveland's dissertation research to date suggests that decomposition of carbon in a lowland tropical rainforest in southwestern Costa Rica is P limited, although the extent of this limitation is still unknown. Early findings have revealed that in spite of the apparent P limitation to microbial processes at this site, the production and activity of phosphatases, enzymes responsible for the mineralization of organic P, are relatively low. This Doctoral Dissertation Improvement Grant will support experiments that address the following two basic questions: 1. Does phosphorus availability limit the decomposition of native carbon in moist tropical forests? and 2. At a site where the mineralization of organic P should be important in offsetting deficiencies in available inorganic P, is phosphatase activity directly limited by the availability of another element?

尽管人们普遍认为，磷（P）的可用性对热带森林中的生态系统动态构成了强烈限制，但这种信念的直接测试很少。此外，大多数解决此问题的研究都集中在对植物社区的限制上。几乎没有一个人解决了微生物社区受到限制的可能性。克利夫兰先生迄今为止的论文研究表明，在哥斯达黎加西南部的低地热带雨林中，碳的分解是有限的，尽管这种限制的程度仍然未知。早期发现表明，尽管明显的P限制了该部位的微生物过程，但负责有机P矿化的磷酸酶的产生和活性相对较低。该博士学位论文的改进赠款将支持解决以下两个基本问题的实验：1。磷的可用性是否限制了潮湿的热带森林中天然碳的分解？ 2。在一个在可用无机P中抵消缺乏的地方，有机P的矿化应该很重要，磷酸酶活性是否直接受到另一个元素的可用性的限制？