Long-Term Ecological Research at the H.J. Andrews Experimental Forest (LTER4)

指导HJ Andrews LTER的核心问题是：土地利用、自然干扰和气候变化如何影响三个关键的生态系统属性：碳动态、生物多样性和水文？这三种生态系统特性具有很高的科学和社会意义，它们代表了对景观格局的三种不同类型的生态响应。综合这些研究结果的主要空间尺度是安德鲁斯森林景观（6400公顷）和邻近的蓝河上游流域（9000公顷）。基于对未来各种可能条件的模型预测，感兴趣的时间尺度跨越过去500年，并延伸到未来几个世纪。LTER研究与更大空间尺度和古生态时间尺度的工作密切相关。本研究遵循一项战略计划，通过继续使用安德鲁斯LTER作为俄勒冈州安德鲁斯实验森林大型多方面研究项目的核心，来回答这个指导性问题。自1980年启动以来，安德鲁斯森林LTER项目包括长期实验、测量项目、短期研究和建模分析，研究内容包括气候、水文、干扰制度/景观动态、植被演替、生物多样性、碳和营养动态以及森林-河流相互作用。在此基础上，将从物种对生态系统功能的影响、早期演替的格局和过程、小流域分析和景观动态分析四个方面进行综合研究。在这一LTER活动的继续下进行的研究将促进对太平洋西北地区森林景观中生态系统结构和功能控制的科学认识。

Swanson 9632921 The central question guiding the HJ Andrews LTER is: How do land use, natural disturbances and climate change affect three key ecosystem properties: carbon dynamics, biodiversity, and hydrology? These three ecosystem properties are of high scientific and social interest and represent three rather different categories of ecological response to landscape patterns. The principle spatial scale for synthesizing results of these studies is the Andrews Forest landscape (6400 ha) and the adjacent upper Blue River watershed (9000 ha). The time scale of interest spans the past 500 yrs and extends several centuries into the future, based on model projections of alternative possible future conditions. LTER studies link closely with work at larger spatial scales and paleoecological time scales. This research follows a strategic plan to answer this guiding question by continuing to use the Andrews LTER as the core of the large, multi-faceted research program based at Andrews Experimental Forest in Oregon. Since its inception in 1980, the Andrews Forest LTER program has consisted of long-term experiments, measurement programs, short-term studies and modeling analyses in a series of research components: climate, hydrology, disturbance regimes/landscape dynamics, vegetation succession, biological diversity, carbon and nutrient dynamics, and forest-stream interactions. Under this renewal proposal, four related synthesis efforts will take place: effects of species on ecosystem functioning, pattern and process during early succession, analysis of small watersheds, and analysis of landscape dynamics. Research under the continuation of this LTER activity will advance scientific understanding of controls on ecosystem structure and function in the forested landscapes of the Pacific Northwest.