Long-term Ecological Research (LTER) at the Hubbard Brook Experimental Forest

该项目将继续哈伯德的研究活动 布鲁克长期生态研究项目，扩大 在最初的主题上，自然和人类活动的影响 干扰对北方阔叶树结构和功能的影响 森林生态系统 通过一项综合监测方案， 研究人员将研究四个过程级别的研究 干扰的主要类别：（1）造林和土地- （2）空气污染，（3）大气中二氧化碳的变化， 区域气候;（4）异养生物入侵。 水文气象、生态系统化学和生物监测 活动将继续并扩大。 加上详细的， 过程级研究，这将允许测试假设 关于，（1）植被，森林地面，有机 碎屑坝和土壤地球化学对皆伐采伐的影响，（2） 哈伯德布鲁克山谷和 更大的Pemigewasset-Merrimack Basion生态系统结构和 功能，（3）酸沉积负荷的变化， 地球化学循环的响应;（4） 微量金属，（5）碳收支的影响和反应 变化的大气CO2和区域气候，（6）相互作用 在繁殖的鸟类、植食性昆虫和植物中 结构与产量;（7）细粉生长与寿命 根和地下食草动物。 该研究将整合 使用几种新的和现有的生态系统模型。

This project will continue the research activities of the Hubbard Brook Long-term Ecological Research project (HBR-LTER), expanding upon the original theme, the effects of natural and anthropogenic disturbances on the structure and function of northern hardwood forest ecosystem. Through an integrated program of monitoring and process-level studies the investigators will examine four principal categories of disturbance: (1) silviculture and land- use, (2) air pollution, (3) changes in atmospheric CO2 and regional climate, and (4) irruptions of heterotrophic organisms. Monitoring of hydrometerology, ecosystem chemistry and biotic activity will be continued and expanded. Together with detailed, process-level studies this will allow the testing of hypotheses concerning, (1) responses of vegetation, forest floor, organic debris dams and biogeochemistry to clearcut harvesting, (2) effects of land-use changes in the Hubbard Brook Valley and the larger Pemigewasset-Merrimack Basion on ecosystem structure and function, (3) changes in loading of acidic deposition and responses of biogeochemical cycles, (4) ecosystem processing of trace metals, (5) carbon budget effects on and responses to changing atmospheric CO2 and regional climate, (6) interactions among breeding birds, phytophagous insects and vegetation structure and production, and (7) growth and longevity of fine roots and belowground herbivory. The research will be integrated using several new and existing ecosystem models.