REU/LTREB: Long-term Studies of Forest Dynamics

目前关于自然的许多不确定性， 森林演替的机制是缺乏的结果， 长期数据集，特别是那些涉及 个体的建立、生长和死亡模式 植物 对杜克森林长期数据集的测量， 北卡罗来纳州将继续在长期的庇护下， 环境生物学研究（LTREB） 这些数据 包括：1.永久性样地（PSP）。 这些情节是 1931年至1947年建立的看台代表了一个阵列， 和演替阶段。 着名树木 此后，这51块永久地块已被普查和测量 大约5年的间隔。 这些数据将用于检查 树木生长和死亡率的长期变化，2。 密集 幼苗和树苗地块。 在这些图中， 代表一系列立地和演替条件的林分 1977年，每年都对绘制的幼苗进行普查。 间伐和过渡阶段集约化地块的监测 松树和硬木看台将继续。 述取样协议 将包括树苗种群。 这些数据将有助于 同龄松向速生松转变机理的研究 年龄不等的硬木林，以及长期趋势， 幼苗和幼树种群，3.森林地图。 代表过渡松树的永久性森林地图- 硬木林分和硬木林分将重新取样。 这些 数据将被用来解决各种问题， 格局和林分结构的演替变化。

Much of the current uncertainty regarding the nature and mechanisms of forest succession is a consequence of the paucity of long-term data sets, particularly those dealing with the patterns of establishment, growth, and mortality of individual plants. Measurements of long-term data sets in the Duke Forest, North Carolina will be continued under the aegis of the Long-Term Research in Environmental Biology (LTREB) program. These data sets include: 1. Permanent Sample Plots (PSPs). These plots were established between 1931 and 1947 in stands representing an array of site conditions and successional stages. Individual trees in these 51 permanent plots have since been censused and measured at roughly 5-year intervals. These data will be used to examine long-term changes in tree growth and mortality, 2. Intensive Seedling and Sapling Plots. In these plots, established in stands representing an array of site and successional conditions in 1977, mapped individual seedlings have been censused annually. Monitoring of intensive plots in thinning- and transition-stage pines, and hardwood stands will continue. The sampling protocol will include sapling populations. These data will facilitate studies of mechanisms of transition from even-aged pine to uneven-aged hardwood forests, as well as long-term trends in seedling and sapling demography, 3. Mapped Forest Plots. Permanent mapped forest plots representing transition pine- hardwood stands and hardwood stands will be resampled. These data will be used to address a variety of a questions related to successional changes in pattern and stand structure.