Environmental Drivers and Age Trends in Site Productivity for Oak in Southern Poland

编号 010028101

推送时间 20210308

研究领域 森林生态 

年份 2021 

类型 期刊 

语种 英语

标题 Environmental Drivers and Age Trends in Site Productivity for Oak in Southern Poland

来源期刊 Forest

期 第281期

发表时间 20210210

关键词 site index;  geocentric model;  soil nitrogen and carbon content;  age trend; 

摘要 Site productivity provides critical information for forest management practices and is a fundamental measure in forestry. It is determined using site index (SI) models, which are developed using two primary groups of methods, namely, phytocentric (plant-based) or geocentric (earth-based). Geocentric methods allow for direct site growth modelling, in which the SI is predicted using multiple environmental indicators. However, changes in non-static site factors—particularly nitrogen deposition and rising CO2 concentration—lead to an increase in site productivity, which may be visible as an age trend in the SI. In this study, we developed a geocentric SI model for oak. For the development of the SI model, we used data from 150 sample plots, representing a wide range of local topographic and site conditions. A generalized additive model was used to model site productivity. We found that the oak SI depended predominantly on physicochemical soil properties—mainly nitrogen, carbon, sand, and clay content. Additionally, the oak SI value was found to be slightly shaped by the topography, especially by altitude above sea level, and topographic position. We also detected a significant relationship between the SI and the age of oak stands, indicating the long-term increasing site productivity for oak, most likely caused by nitrogen deposition and changes in climatic conditions. The developed geocentric site productivity model for oak explained 77.2% of the SI variation. View Full-Text

服务人员 王璐

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