Collaborative Research: Reorganization of Nutrient Capital in a Northern Hardwood Forest After a Whole-Tree Harvest

将研究整棵树收获后重新生长的北方阔叶林的有机质和养分动态。 将特别关注砍伐后第四年和第五年系统植被和土壤中有机质和养分库的模式和数量的变化。 由于对森林系统地下部分变化的反应知之甚少，因此将强调根部研究。 这项研究将使用许多最先进的技术。 例如，各种植物物种对土壤中有机质储量的相对贡献将使用铜氧化技术来确定。 这是确定植物组织木质素中酚类单体比例的程序。 初步证据表明单体的初始比例和比例变化是物种特异性的。 完善的森林生长和水文模型将有助于综合来自这项研究的数据。 该研究计划还包括进一步开发森林生长模型的地下部分。 这项研究将加深我们对森林如何从干扰中恢复的理解。 从这项研究中获得的知识对于为国家森林这一重要自然资源制定明智的管理计划非常重要。 宾夕法尼亚大学和康奈尔大学研究人员之间的合作研究工作将因怀俄明大学和耶鲁大学研究人员的贡献而得到加强。 所有参与这项研究的科学家都富有成效。 所有相关机构的设施都非常好。 这项研究是在新罕布什尔州中北部的哈伯德布鲁克实验森林进行的，那里的现场设施非常好。

Organic matter and nutrient dynamics in a regrowing northern hard wood forest following a whole-tree harvest will be studied. Particular attention will be paid to changes in the patterns and magnitudes of organic matter and nutrient pools in the vegetation and soils of a system in years four and five after cutting. Root studies will be emphasized since response to change of this belowground component of forest systems in very poorly known. A number of state-of-the-art techniques will be used in this study. For example, the relative contributions of various plant species to organic matter stocks in the soil will be determined using the cupric oxidation technique. This is a procedure for identifying the proportions of phenolic monomers in lignin of plant tissues. Preliminary evidence suggests that the initial proportions and changes in the proportions of the monomers are species specific. Well developed forest growth and hydrologic models will aid in the synthesis of the data derived from this research. The research plan also includes further development of the below- ground portion of the forest growth model. This research will add to our understanding of how forests recover from disturbance. The knowledge gained from this study is important for developing wise management plans for a critical natural resource, the nations forests. The collaborative research effort between researchers at the University of Pennsylvania and Cornell University will be augmented by contributions from researchers at the University of Wyoming and Yale University. All of the scientists involved in the study are productive. The facilities at all involved institutions are excellent. The research being done at the Hubbard Brook Experiment Forest in north central New Hampshire and the field facilities there are excellent.