Atmosphere-Biosphere Exchange in a Forest Ecosystem in New England

Wofsy和Bazzaz博士将决定 大气和森林生态系统之间的重要气体， 新英格兰。 目的是量化大气-生物圈 CO2、H2O、O3、NO、NO2、NOy的汇率（所有 氮氧化物）和混合硬木中的总烃 站在马萨诸塞州彼得舍姆的哈佛森林里。 的 测量将有助于阐明系统的响应， 及其主要组成部分， 和污染物输入，提供必要的数据， 生态系统对气候变化和全球污染的反应。 率 整个生态系统的气体交换将使用 涡动相关法，适用于2个或更多年周期。 土壤 排放率将受到监测， 将测量整个森林树冠的树叶。 将持续监测大气中的浓度 从地面到30米的8层。 诊断模型， 生物活性气体的交换将被开发， 生态系统，以帮助阐明调节气体的因素 交易所 该研究将确定净生态系统交换（NEE） 二氧化碳和其他气体在森林中的所有季节，将定义 土壤和树叶对NEE的贡献 冠层，并将研究可能的影响，O3，氮 氧化物和太阳辐照度、温度、湿度 二氧化碳固定和其他交换过程。 的作用 将界定森林碳预算中的气态碳氢化合物。 沃夫西博士和巴扎兹是各自领域的领导者， 对这项研究的机构支持是突出的。

Drs. Wofsy and Bazzaz will determine net exchange rates for important gases between the atmosphere and a forest ecosystem in New England. The purpose is to quantify atmosphere-biosphere exchange rates for CO2, H2O, O3, NO, NO2, NOy (sum of all oxidized nitrogen), and total hydrocarbons in a mixed hardwood stand in Harvard Forest, Petersham, Massachusetts. The measurements will help to elucidate the response of the system, and its main component parts, to natural environmental variations and pollutant inputs, providing data essential for understanding ecosystem response to climate change and global pollution. Rates of gas exchange for the whole ecosystem will be measured using eddy-correlation methods, for 2 or more annual cycles. Soil emission rates will be monitored, and exchange rates for intact leaves will be measured throughout the forest canopy. Concentrations in the atmosphere will be monitored continuously at 8 levels from the ground to 30m. A diagnostic model for exchange of biologically active gases will be developed for the ecosystem, to aid in elucidating the factors regulating gas exchange. The study will determine net ecosystem exchange (NEE) of CO2 and other gases in the forest in all seasons, will define contributions to NEE of soils and of leaves throughout the canopy, and will examine possible influence of O3, nitrogen oxides and variations in solar irradiance, temperature, humidity, on CO2 fixation and other exchange processes. The role of gaseous hydrocarbons in the forest carbon budget will be defined. Dr. Wofsy and Bazzaz are leaders in their fields, and the institutional support for this research is outstanding.