亚热带退化红壤丘陵区典型先锋树种碳吸存与水分利用耦合机制

项目名称： 亚热带退化红壤丘陵区典型先锋树种碳吸存与水分利用耦合机制

项目编号： No.31260172

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 农业科学

项目作者： 涂洁

作者单位： 南昌工程学院

项目金额： 50万元

中文摘要： 生态系统碳-水耦合机制是全球变化与可持续发展研究的主要内容之一。我国亚热带红壤丘陵区是一个特殊的生态类型区，面临着植被恢复重建与森林可持续经营的重大挑战。研究该区典型先锋树种（湿地松、马尾松）碳-水耦合机制，不仅可以为优化该区生态恢复措施、科学经营管理南方人工林提供理论依据，还可以阐明我国亚热带人工林对全球森林生态系统碳循环与水循环的贡献。研究内容包括：（1）基于森林生物量、凋落物现存量及土壤碳库的测定，估算人工林各分室碳库；（2）基于净初级生产力、凋落物量及土壤异养呼吸的测定，分析人工林碳吸存动态；（3）基于液流密度与土壤蒸发量的测定，结合空间尺度转换，推算林分耗水量（4）基于叶片气体交换的测定，探讨叶片水分利用效率；（5）分析树干液流与树干呼吸的相关性，完善树干呼吸理论；（6）基于碳吸存与水分利用动态的测定，揭示不同尺度（叶片、单木、林分）人工林生态系统碳-水耦合机制。

中文关键词： 亚热带退化红壤丘陵区；先锋树种；碳吸存；水分利用；耦合机制

英文摘要： Coupling mechanism of ecosystem carbon sequestration and water use is among the main research contents of global change and sustainable development. And it is also the important link of vegetation physiological and ecological characteristics and functions research on different scales.Subtropical red soil hilly area is a special ecological type region,once became the red desert of Southern China due to long-term man-made unreasonable use,faced with key challenges of vegetation recovery and sustainable forest management.Study on carbon and water coupling mechanism of typical pioneer species (illustrated by Pinus elliottii and Pinus manssoniana ) could not only provide the theoretical basis for ecological restoration measure optimization and scientific managenemnt, but also clarify the contribution of subtropical plantation to global forest ecosystem carbon and water cycle. The main research contents include: (1) Estimation of plantation sub-chamber carbon pool based on forest biomass, litter standing crop and soil carbon pool measurements; (2) Analysis of carbon sequestration dynamic based on plantation net primary productivity, litterfall and soil heterotrophic respiration measurements; (3) Calculation of stand water use based on sap flow density and soil evaporation measurements, combined with spatial scale conv

英文关键词： subtropical degraded red soil hilly area；pioneer tree species；carbon sequestration；water use；coupling mechanism