Controls of Structure and Function of Aquatic Ecosystems in the Arctic

9400722霍比淡水系统是北极景观的一个主要特征，尽管降水量低，因为永久冻土层阻止排水和蒸发量低。 它们相对简单的生物学特性为研究人员试图理清北极湖泊和河流的各种控制和相互作用提供了优势。 对生态过程的理解是该项目长期目标的必要组成部分：预测土地利用和气候变化对北极河流和湖泊生态系统的影响。 该项目将设在阿拉斯加北坡的Toolik湖的LTER站点，并将利用河流和湖泊施肥的长期实验以及对湖泊中主要捕食者湖鳟的操纵。 这些操作由LTER小组维持。 该项目还将使用LTER产生的关于基本环境条件的数据，包括气候、湖泊物理和化学、河流和湖泊中的营养物浓度以及河流流量。 该项目将大力综合和使用来自所有过去研究的数据，以及最近对河流和湖泊的操作数据。 合成和建模的长期目标是了解高北极地区整个流域的水，营养物质和有机物质的运动和转化。 ***

9400722 Hobbie Freshwater systems are a major feature of the arctic landscape, despite the low precipitation, because permafrost prevents drainage and evaporation is low. Their relative biotic simplicity offers advantages to researchers attempting to sort out the various controls and interactions of arctic lakes and streams. An understanding of the ecological processes is a necessary part of the long-term goal of this project: prediction of the effect of changes in land use and climate on arctic stream and lake ecosystems. This project will be based at an LTER site, Toolik Lake, on the North Slope of Alaska, and will make use of long-term experiments of stream and lake fertilization and manipulations of the dominant predator in lakes, the lake trout. These manipulations are maintained by the LTER group. The project will also use LTER-produced data on basic environmental conditions including climate, lake physics and chemistry, nutrient concentrations in streams and lakes, and stream flow. The project will move strongly towards synthesis and use data derived from all the past studies plus data from recent manipulations on streams and lakes. The long-term goal of the synthesis and modeling is to understand the movements and transformations of water, nutrients, and organic matter through an entire watershed in the high Arctic. ***