Enzymatic diversity of biological nitrogen fixation in a changing world

不断变化的世界中生物固氮的酶多样性

• 批准号: RGPIN-2016-03660
• 负责人: Bellenger, JeanPhilippe
• 金额: $ 3.5万
• 依托单位: Université de Sherbrooke
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=633675
• 关键词: Enzymatic; diversity; biological; nitrogen; fixation

The boreal forest is one of the largest untouched terrestrial ecosystem in the world and supports essential economic sectors (i.e forestry, tourism) in Canada. Understanding boreal ecosystems function is thus of prime ecological and economical importance. In boreal forests, nitrogen is the nutrient that is most often reported as limiting primary productivity. While boreal forest soils are often rich in total nitrogen, this nitrogen is bound in recalcitrant forms that are not readily available to plants. Therefore, forest growth strongly relies on rapidly cycling nitrogen and new nitrogen inputs. The last arises from biological nitrogen fixation by microorganisms, especially cyanobacteria, involved in symbiotic and mutualistic associations with mosses and lichens or living freely in soil. In the next decades, the boreal forest will undergo unprecedented perturbations (e.g. increased temperature, humidity) due to global climate change. Recent studies reported that nitrogen availability to plants will likely play a critical role in the response of the boreal forest to global climate change.

北方森林是世界上最大的未被破坏的陆地生态系统之一，支持着加拿大的基本经济部门(即林业、旅游业)。因此，了解北方生态系统的功能具有重要的生态和经济意义。在北方森林中，氮是最常被报道为限制初级生产力的养分。虽然北方森林土壤通常富含全氮，但这些氮以顽强的形式结合在一起，植物不容易获得。因此，森林生长在很大程度上依赖于快速循环的氮素和新的氮素投入。后者来自微生物，特别是蓝藻的生物固氮，参与与苔藓和地衣的共生和互惠关系，或在土壤中自由生活。在接下来的几十年里，由于全球气候变化，北方森林将经历前所未有的扰动(如温度、湿度增加)。最近的研究报告称，植物的氮素有效性很可能在北方森林对全球气候变化的反应中发挥关键作用。