Integrated sap flow systems to evaluate the impact of short-droughts on evapotranspiration and carbon uptake in age-sequence of planted conifer forests

综合液流系统评估短期干旱对人工针叶林年龄序列蒸散量和碳吸收的影响

• 批准号: 390481-2010
• 负责人: Arain, MuhammadAltaf
• 金额: $ 2.31万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2009
• 资助国家: 加拿大
• 起止时间: 2009-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=443201
• 关键词: Integrated; sap; flow; systems; evaluate

Forests play an integral role in the global carbon cycle by sequestering atmospheric carbon dioxide (CO2) into vegetation biomass through photosynthesis and releasing CO2 through plant and soil respiration and biomass decomposition. Plantation or afforested forests in both Canada and the United States have been a large carbon (C) sink over many of the last decades. However, recent studies indicate that their carbon sequestration capabilities are being affected by changes in regional climate. Climate warming, increasing winter/summer temperatures and heat events have increased evaporation, causing more frequent drought events. Short-term, severe drought events may significantly reduce forest photosynthetic uptake, particularly when they occur during the peak growing periods of spring and early summer. Changes in forest hydrology alters soil carbon emissions as well, which feeds-back on both carbon and water cycles.

森林在全球碳循环中发挥着不可或缺的作用，它通过光合作用将大气中的二氧化碳（CO2）吸收到植被生物量中，并通过植物和土壤呼吸作用以及生物量分解释放CO2。在过去的几十年里，加拿大和美国的种植园或绿化森林一直是一个巨大的碳（C）汇。然而，最近的研究表明，它们的固碳能力正受到区域气候变化的影响。气候变暖、冬夏气温升高和高温事件增加了蒸发，导致干旱事件更加频繁。短期的严重干旱事件可能会大大减少森林的光合吸收，特别是当它们发生在春季和初夏的生长高峰期。森林水文的变化也改变了土壤碳排放，这对碳循环和水循环都有反馈作用。