Exploring the black box: coupling above- and belowground plant traits to understand disturbance effects on soil carbon storage in a temperature plantation

探索黑匣子：耦合地上和地下植物性状，以了解温度种植园中土壤碳储存的干扰影响

• 批准号: 121569-2011
• 负责人: Munson, AlisonDale
• 金额: $ 2.91万
• 依托单位: Université Laval
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=545337
• 关键词: Exploring; black; box; coupling; above

The recent IPCC science meetings clearly underline the need for fundamental science to support understanding of ecosystem feedback to climate change and consequent important policy decisions in the next decades. A key element of this fundamental science program relates to understanding biogeochemical cycles of carbon and nitrogen, as well as how changes in land use and vegetation response may modify these cycles. The current proposal continues 20 years of fundamental research on nutrient cycles in temperate plantation ecosystems, with an emphasis on feedbacks of vegetation changes to these cycles, and the resulting forms and relative stability of carbon in the soil. The present five-year program will integrate the approach of functional plant traits in order to interpret the effects of different plant communities created by intensive silviculture on nutrient cycling and specifically, carbon accumulation and stability in the soil. Specific objectives include: 1) characterize age-related change in plant traits (both green foliage and litter) of dominant tree species (specific leaf area, foliar C and N) ; 2) characterize above- and belowground traits (roots) of dominant tree and understory species to interpret differences in soil carbon accumulation and stability in humus and mineral soil ; 3) further investigate potential soil carbon losses (potential priming effect) in deeper mineral horizons associated with plantation establishment and intensive soil disturbance. Newly accessible methods of mid- and near infrared spectroscopy will be applied to investigate their potential to evaluate both plant tissue chemistry and soil carbon stability more efficiently than current techniques. These next five years of a long term program will simultaneously probe deeper questions of plant feedback on carbon sequestration while synthesizing what will be a 25-year program (in 2011) of research on the same site. To culminate this program I will write a major synthesis paper with previous collaborators and students. These studies are important in order to understand and manage soil carbon accrual in forests, and will also contribute important information to improve current models for predicting carbon dynamics in ecosystems.

最近的IPCC科学会议清楚地表明，基本科学的需求支持对生态系统反馈对气候变化的了解以及未来几十年中随之而来的重要政策决策。该基本科学计划的一个关键要素涉及了解碳和氮的生物地球化学周期，以及土地利用和植被反应的变化如何改变这些周期。当前的提案持续了20年的温带种植生态系统中营养周期的基本研究，重点是对这些周期的植被变化的反馈以及土壤中碳的结果形式和相对稳定性。目前的五年计划将整合功能性植物特征的方法，以解释由密集型造林培养对养分循环的不同植物群落的影响，具体来说是碳积累和土壤中的稳定性。具体目标包括：1）表征主要的树种物种（特定叶子面积，叶面C和N）的植物特征（绿叶和垃圾）的年龄相关变化； 2）表征主要树和地下物种的地下和下面的特征（根），以解释腐殖质和矿物土壤中土壤碳积累和稳定性的差异； 3）进一步研究与种植园建立和强化土壤干扰有关的更深层矿物层中潜在的土壤碳损失（潜在的启动效应）。与当前技术相比，将采用新近可访问的中高红外光谱法的方法来调查其潜力，以更有效地评估植物组织化学和土壤碳稳定性。在接下来的长期计划的接下来的五年中，将同时探讨植物反馈对碳固存的更深入的问题，同时综合同一站点研究的25年计划（2011年）。为了达到该程序，我将与以前的合作者和学生一起撰写一份主要的合成论文。这些研究对于了解和管理森林中的土壤碳的应计非常重要，还将为改善当前模型来预测生态系统中的碳动态。