Collaborative Research: Interaction of Climate Nutrition on Forest Production: Comparison of Controlling Factors in Contrasting Environments

森林生态系统中碳收支的最大不确定性似乎在于控制碳在地上和地下生产分配的幅度和因素。高尔、朗恩和戈尔兹博士建议在四种气候差异很大的森林中测量关键的碳收支指数（每一种森林都有对照和施肥的林分）。他们的分析将集中在通过相同测量得出的不同地点的相对碳预算上，而不是一个地点的详细碳预算。他们将估算俄勒冈州、蒙大拿州、威斯康辛州和佛罗里达州针叶林的地上和地下净初级生产量、冠层光合作用生产量和茎、枝、根呼吸损失指数。一个计算森林中水、碳和氮循环的已建立的生态系统过程模型将用于整合实地数据，在测量期间进行插值，并评估他们关于不同气候下可变碳分配模式的假设。在佛罗里达州进行的一项正在进行的深入研究的详细数据将用于将他们的相关预算置于背景中。研究结果应能增进对森林生产力的环境控制的基本了解，从而更好地预测森林对空气污染和气候变化等扰动的反应。

The greatest uncertainty of carbon budgets in forest ecosystems appears to be in the magnitude and factors controlling partitioning of carbon to above- versus belowground production. Dr. Gower, Running, and Gholz propose to measure key carbon budget indices at four forests of widely contrasting climate (each with control and fertilized stands). Their analyses will concentrate on relative carbon budgets of the contrasting sites, produced by identical measurements, rather than a detailed carbon budget on one site. They will estimate above- and belowground net primary production and indices of canopy photosynthetic production and stem, branch, and root respiration losses of conifer forests in Oregon, Montana, Wisconsin and Florida. An established ecosystem process model that calculates water, carbon and nitrogen cycles in forests will be used to integrate field data, interpolate between measurement periods and evaluate their hypotheses on variable carbon partitioning patterns in diverse climates. Detailed data from an on-going intensive study at the Florida site will be used to place their relative budgets into context. Results should provide improved fundamental understanding of environmental controls on forest productivity, allowing better projections of forest responses to perturbations such as air pollution and climate change.