Impact of planting trees on abandoned farmlands on diversity and carbon sequestration

在废弃农田植树对多样性和碳固存的影响

• 批准号: 566734-2021
• 负责人: DesRochers, AnnieA
• 金额: $ 6.89万
• 依托单位: Université du Québec en Abitibi-Témiscamingue
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=757540
• 关键词: Impact; planting; trees; abandoned; farmlands

The establishment of plantations on abandoned farmland offers good opportunities to sequester carbon into plant biomass and soils. Plantations established on abandoned farmlands can be beneficial to biodiversity compared to cultivated lands, by accelerating the invasion and installation of native plants where ecological barriers to plant succession can halt or slow down colonisation. The potential for plantations to fulfill ecological services typically found in the ecosystems they are replacing (fallow lands, cultivated lands or forests) is however largely unknown. This study aims to determine the effects of establishing hybrid poplar and white spruce plantations on vascular and non-vascular plant functional diversity and species composition, soil microbiome and carbon content, in relation to the previous use of the sites and in comparison with surrounding forests and unplanted abandoned farmlands. We also aim to compare biodiversity along a chronosequence of planted (white spruce) and comparable unplanted fallow lands. Finally, this study aims to identify functional root traits that increase carbon sequestration in deep soil layers and in stable forms, and how the soil microbiome interacts with these traits.Already established white spruce and hybrid poplar plantations will be samples according to their previous land use (poplar) and age (spruce), in order to characterize their plant composition and soil microbiome, in comparison with unplanted abandoned farmland and surrounding forest. Soil carbon will be measured in the hybrid poplar plantations along with root functional traits of several clones that have slow to rapid growth rates, in order to link these traits with long term carbon sequestration. In the end, this project will contribute to make informed decisions and silviculture investments into plantations, according to ecological criteria and optimize outcomes better targeted to Canada's objectives of using trees to compensate CO2 emissions and manage diversity over the landscape.

在废弃农田上建立种植园为将碳封存到植物生物质和土壤中提供了良好的机会。与耕地相比，在废弃农田上建立的种植园可以加速本地植物的入侵和种植，从而有利于生物多样性，而植物演替的生态障碍可以阻止或减缓殖民化。然而，人工林履行其所取代的生态系统（休耕地、耕地或森林）中通常存在的生态服务的潜力在很大程度上尚不清楚。本研究旨在确定建立杨树和白云杉杂交种植园对维管束和非维管束植物功能多样性和物种组成、土壤微生物组和碳含量的影响，与这些地点以前的使用有关，并与周围的森林和森林进行比较。未种植的废弃农田。我们还旨在按照种植（白云杉）和类似的未种植休耕地的时间顺序比较生物多样性。最后，本研究旨在确定能够增加深层土壤和稳定形式固碳的功能性根系性状，以及土壤微生物组如何与这些性状相互作用。已建立的白云杉和杂交杨树人工林将根据其先前的土地利用情况进行采样（杨树）和年龄（云杉），以便与未种植的废弃农田和周围森林进行比较，以表征其植物组成和土壤微生物组。将在杂交杨树种植园中测量土壤碳以及几个生长速度缓慢到快速的无性系的根功能性状，以便将这些性状与长期碳固存联系起来。最终，该项目将有助于根据生态标准做出明智的决策和对人工林的造林投资，并优化结果，更好地实现加拿大利用树木补偿二氧化碳排放和管理景观多样性的目标。