An Experimental Test of the Impacts of Rising Temperature on Carbon Input, Allocation, and Loss in Model Forests

温度升高对模型森林碳输入、分配和损失影响的实验测试

• 批准号: 0816486
• 负责人: Creighton Litton
• 金额: --
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-01 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0816486&HistoricalAwards=false
• 关键词: Experimental; Test; Impacts; Rising; Temperature

Carbon storage in the terrestrial biosphere exceeds that in the atmosphere by a factor of four, and represents a dynamic balance between carbon inputs and losses. This balance is being altered by climate change and land-use, with important impacts on terrestrial carbon storage and, hence, atmospheric CO2 levels. However, the response of terrestrial carbon cycling to warming and interactions with land-use remain poorly quantified. This study will examine how rising temperature and land-use interact to regulate carbon input, allocation, and loss in a model study system, thereby enhancing capacity to predict how terrestrial ecosystems will respond to the interactive effects of warming and land-use. To do this, we will measure aboveground and belowground carbon storage and exchange across a 6°C temperature gradient within the Hawaii Experimental Tropical Forest. At each of four temperature regimes, paired and replicated plots will be established in degraded pasture, secondary native forest, and intact native forest to examine how mean annual temperature and land-use interact to affect carbon input, allocation and loss in forest ecosystems. In addition to examining how rising temperature and land-use interact to impact terrestrial carbon balance, this study will also: (i) build a model global change research platform that can be used by other scientists; (ii) provide critical data on terrestrial carbon storage to the global change community, including scientists, policy makers, and land managers; (iii) enhance graduate and postdoctoral training and undergraduate science education at a Native Hawaiian serving institution; and (iv) foster collaboration between the University of Hawaii and the USDA Forest Service on the newly established Hawaii Experimental Tropical Forest.

陆地生物圈中的碳储存量是大气中碳损失的四倍，代表了碳输入和土地利用之间的动态平衡，这种平衡正在因气候变化和土地利用而改变，对陆地碳产生重要影响。然而，陆地碳循环对变暖的响应以及与土地利用的相互作用仍然缺乏量化。这项研究将如何通过升高的温度和土地利用的相互作用来调节碳的输入、分配和损失。模型研究系统，增强预测陆地生态系统如何应对变暖和土地利用的相互作用影响的能力为此，我们将测量夏威夷境内 6°C 温度梯度的地上和地下碳储存和交换。实验热带森林在四种温度状况下，将在退化牧场、次生原生林和完整的原生林中建立配对和复制样地，以研究年平均温度和土地利用如何相互作用影响碳输入、分配和损失。森林除了研究气温上升和土地利用如何相互作用影响陆地碳平衡外，这项研究还将：（i）建立一个可供其他科学家使用的模型全球变化研究平台；（ii）提供有关生态系统的关键数据。陆地碳储存向全球变化界，包括科学家、政策制定者和土地管理者提供帮助；(iii) 加强夏威夷原住民服务机构的研究生和博士后培训以及本科生科学教育；(iv) 促进夏威夷大学和美国农业部林务局新建立的夏威夷实验热带森林。