马尾松营养分布及与土壤养分关系

硕士毕业论文，以45年生马尾松成熟林为对象，设置20×20m的实验样地，在2018年1月份采集样马尾松各器官样品及其对应林下土样（土层深度≦80cm），测定其养分含量并估算养分储量；每月定期收集马尾松凋落物，将凋落物分类（按叶、枝、繁殖体、其他分类），计算养分归还量。明晰马尾松林下土壤养分分布特征，马尾松养分分布及归还状况，系统深入的了解马尾松养分分布的规律及其与土壤养分的关系，为马尾松林的可持续经营提供理论依据。

This master's thesis focuses on a 45-year-old mature Pinus massoniana forest, with 20×20 m experimental plots set up. In January 2018, samples of each organ of Pinus massoniana and corresponding understory soil samples (soil depth ≤ 80 cm were collected. Nutrient contents were determined and nutrient storage was estimated. Monthly regular collection of Pinus massoniana litter was conducted, which was classified into four categories: leaves, branches, propagules and others, and the nutrient return amount was calculated. This study clarifies the distribution characteristics of soil nutrients in the understory of Pinus massoniana forests, as well as the nutrient distribution and return status of Pinus massoniana itself. It systematically and in-depthly explores the patterns of nutrient distribution of Pinus massoniana and their relationship with soil nutrients, thereby providing a theoretical basis for the sustainable management of Pinus massoniana forests.