A Synergistic Approach of Using Fluxes, Isotopes and Models to Partition Plant and Soil Contributions to Ecosystem Exchange of CO2 and H2O

使用通量、同位素和模型来划分植物和土壤对 CO2 和 H2O 生态系统交换的贡献的协同方法

• 批准号: 0317139
• 负责人: Todd Dawson
• 金额: --
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-15 至 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0317139&HistoricalAwards=false
• 关键词: Synergistic; Approach; Using; Fluxes; Isotopes

Terrestrial ecosystems play a central role in the cycling of carbon (C) and water (H2O) on Earth, yet the quantification of the biological and physical controls over the rates and magnitudes of C and H2O movement into and out of the plants and the soils within any particular ecosystem are largely unknown. The proposed research will, for the first time, combine a set of proven methods that will afford a better understanding of the biophysical controls on whole-ecosystem C and H2O exchange. These methods will permit the partitioning of the various fluxes amongst those related to plant photosynthesis, respiration, and transpiration versus soil-related fluxes from microbial and root respiration and evaporation. This information is needed for the development and validation of models aimed at extrapolating fluxes in both space and time and for predicting how ecosystems will respond to increasing atmospheric CO2 concentrations and more water limitation in the future.

陆地生态系统在地球上碳（C）和水（H2O）的循环中起着核心作用，但对任何特定生态系统中C和H2O进出植物和土壤的速率和幅度的生物和物理控制的量化在很大程度上是未知的。拟议的研究将首次联合收割机结合一套行之有效的方法，将提供一个更好地了解生物物理控制整个生态系统的C和H2O交换。这些方法将允许分区之间的各种通量与植物光合作用，呼吸作用，蒸腾作用与土壤相关的通量从微生物和根呼吸和蒸发。需要这些信息来开发和验证旨在推断空间和时间通量的模型，并预测生态系统将如何应对大气中二氧化碳浓度的增加和未来更多的水资源限制。