NOAA/WDS Paleoclimatology - Gaire - Langtang National Park - ABSB - ITRDB NEPA043

This paper is aimed to study the tree line dynamics of Himalayan silver fir (Abies spectabilis D. Don) based on its tree-ring data and age stand distribution at Langtang National Park, Central Nepal. Climatic response on radial growth, recruitment of A. spectabilis and its age distribution are carried out. The average tree density of the species in the study area (total 48 plots of 20 m x 20 m) was 236 no/ha while that for sapling and seedling in the study area was 255 and 350 no/ha, respectively. The stand character and age distribution of the species showed a high level of recruitment in the recent decades, with decreased in average age along with increased altitude. Tree-growth climate relationship showed negative response with temperature of March-May. Upward advancement of tree line is expected in the coming recent decades though not necessarily uniform through the line

本研究旨在基于尼泊尔中部郎塘国家公园的喜马拉雅冷杉（Abies spectabilis D. Don）树轮数据与林分年龄分布，探究其林线动态。研究分析了该物种径向生长的气候响应、喜马拉雅冷杉的更新状况及其年龄分布特征。研究区域共设置48块20 m×20 m的样地，该物种的平均成树密度为236株/公顷，幼树与幼苗密度分别为255株/公顷与350株/公顷。该物种的林分特征与年龄分布显示，近数十年间其更新水平较高，且平均林龄随海拔升高而降低。树木生长与气候的关联分析表明，其径向生长对3-5月的气温呈负响应。预计未来数十年内林线将向上推移，但林线各段的推进幅度未必均匀一致。