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EAGER SitS:Collaborative Research:Projecting Arctic soil and ecosystem responses to warming using SCAMPS: A stoichiometrically coupled, acclimating microbe-plant-soil model

EAGER SitS：合作研究：使用 SCAMPS 预测北极土壤和生态系统对变暖的反应：化学计量耦合的适应微生物-植物-土壤模型

基本信息

批准号：
2051801
负责人：
Seeta Sistla
金额：
$ 9.64万
依托单位：
California Polytechnic State University Foundation
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-09-01 至 2021-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2051801&HistoricalAwards=false
关键词：
EAGER SitS Collaborative Research Projecting

项目摘要

Understanding future arctic terrestrial carbon balance is vital because high latitude soils contain about twice as much carbon as is in the atmosphere and its release would drive a major acceleration of atmospheric carbon dioxide accumulation. This research will advance the understanding of processes regulating the storage and release of carbon from arctic soils across biological and physical scales using a modeling approach. The study will promote both basic research into the controls on arctic soil and ecosystem processes and be applicable to management agencies by describing how linked biotic-abiotic responses to unprecedented warming may influence future carbon balance in Arctic terrestrial ecosystems. Further, this grant will help advance the career of an Assistant Professor at a primarily undergraduate institution, while enhancing gender and racial diversity in the biogeosciences. This research will also directly enhance undergraduate education in arctic biogeoscience through directed mentorship of undergraduate researchers; the research approach and findings will also be incorporated into courses and other teaching activities by the primary investigators.Field studies suggest that inconsistent responses to comparable experimental manipulations across arctic tundra ecosystems might be driven by local variation in the plant and decomposer community. However, the relative importance of, and links between, key biotic (e.g. microbial acclimation) and abiotic factors (e.g. altered snowpack, thaw depth, and nutrient availability) that govern these divergent responses of tundra to climate variation, remains unknown. This project will synthesize available data from ambient and experimental manipulations of arctic ecosystems. The investigators will then use the synthesis to refine, parameterize, and validate a changed version of the Stoichiometrically Coupled, Acclimating Microbe-Plant-Soil (SCAMPS) model. Simulations will explore how variation in seasonal warming and the acclimation potential of the soil microbial and plant community, encompassing community shifts, evolutionary adaptation, and physiological changes across tundra landscapes, affects biogeochemical feedbacks and regulates future carbon balance of arctic soils and ecosystems.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

了解未来的北极陆地碳平衡至关重要，因为高纬度土壤的碳含量约为大气中的两倍，而其释放将大大加速大气中二氧化碳的积累。这项研究将利用建模方法，促进对在生物和物理尺度上调节北极土壤碳储存和释放过程的理解。该研究将通过描述与前所未有的变暖相关的生物-非生物反应如何影响北极陆地生态系统未来的碳平衡，促进对北极土壤和生态系统过程控制的基础研究，并适用于管理机构。此外，这笔赠款将有助于推动本科院校助理教授的职业生涯，同时增强生物地球科学领域的性别和种族多样性。这项研究还将通过对本科生研究人员的直接指导，直接加强北极生物地球科学的本科生教育；研究方法和研究结果也将被主要研究人员纳入课程和其他教学活动中。实地研究表明，北极苔原生态系统对类似实验操作的不一致反应可能是由植物和分解者群落的局部差异造成的。然而，控制苔原对气候变化的不同反应的关键生物因素（例如微生物适应）和非生物因素（例如积雪改变、解冻深度和养分可用性）的相对重要性和之间的联系仍然未知。该项目将综合来自北极生态系统的环境和实验操作的可用数据。然后，研究人员将使用合成来完善、参数化和验证化学计量耦合驯化微生物-植物-土壤（SCAMPS）模型的更改版本。模拟将探索季节性变暖的变化以及土壤微生物和植物群落的适应潜力，包括整个苔原景观的群落转变、进化适应和生理变化，如何影响生物地球化学反馈并调节北极土壤和生态系统的未来碳平衡。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准。