树轮密度是林木质量的重要指标，它受到间伐和气候的影响。但间伐和气候对树轮密度的交互作用影响尚不清晰。项目拟以长白落叶松人工林为对象，基于长期连续观测的间伐实验固定样地及临时样地优势木、亚优势木和被压木三类树木的树芯、气象数据，通过研建气候敏感的包含间伐效应的树轮密度模型，揭示间伐和气候对树轮密度的交互影响，并模拟和预测未来气候变化情景下的树轮密度指标的变化和间伐效应。由于年轮生长数据的重复观测和层次性，拟采用混合效应模型进行参数估计。研究结果将为适应气候变化的落叶松林经营决策提供理论基础。

Wood density is one of the most important and useful wood quality indicators and is significantly affected by potentially confounding factors, such as thinning and climate. To date, these effects have not been comprehensively quantified in Larix olgensis. Dominant, co-dominant and intermediate trees were sampled from long-term fixed and temporary experimental stands along with the related climatic data. The aim of this study was to describe the variation in annual ring density in managed larch plantations as a function of cambial age, growth rate, climatic and thinning factors. The established relationships will be used for quantifying radial density patterns, including the density variation under climate change, will also help further our understanding of the links between ring density and thinning effects. Due to repeated observation and the hierarchical structure of the data, with observations on annual rings nested within trees, themselves clustered within sites, nonlinear mixed-effects modelling techniques will be applied for parameters estimation. Eventually, models will provide predictions to assist forest planner managing larch adapted to climate change in the future.