LTREB: Collaborative Research: Hydrologic-Nutrient Cycle Interactions in Small, Undisturbed and Man-Manipulated Ecosystems

9808944 Driscoll LTREB的这项研究将继续支持在新罕布什尔州哈伯德布鲁克实验森林进行的长期生态和生物地球化学研究，以评估大气沉积、溪流和湖水的化学模式和趋势，并支持对这些信息进行综合和生态整合的努力。过去34年收集并将继续收集的生物地球化学数据将用于检验以下几个关键假设：(1)大气强酸沉积和地表水酸化；(2)大气氮沉积、植被氮吸收和气候因素对生态系统氮损失的作用；(3)土地利用变化对水质的影响。我们将使用生物地球化学和水文学的长期测量、小流域生态系统方法和模拟模型来验证这些假设。在哈伯德布鲁克进行的长期研究的一个重要方面是将当地人为造成的土地利用变化和自然森林演替的影响与酸雨和气候变化等区域干扰的影响区分开来。

9808944 Driscoll This LTREB research will continue to support long-term ecological and biogeochemical studies at the Hubbard Brook Experimental Forest in New Hampshire to evaluate patterns and trends in the chemistry of atmospheric deposition, stream water and lake water, and to support efforts at synthesis and ecological integration of this information. Biogeochemical data that have been collected over the past 34 years and that will continue to be collected will be used to test critical hypotheses on (i) atmospheric deposition of strong acids and surface water acidification, (ii) the role of atmospheric deposition of nitrogen, nitrogen uptake by vegetation, and climatic factors on ecosystem nitrogen loss, and (iii) the effects of changing land-use on water quality. We will use long-term measurements of biogeochemistry and hydrology, the small watershed-ecosystem approach, and simulation models to test these hypotheses. An important aspect of the long-tern studies at Hubbard Brook is to separate the effects of local human-caused, land-use changes and natural forest succession from the impacts of regional disturbances, such as acid rain and climate changes.