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ERE研究文章|基于植被生产力季节动态的环极北极冻土带生态系统功能类型

28 8月 2024 gabriels

Biodiversity, when viewed through the combined lenses of compositional, structural, and functional attributes, provides for a holistic understanding of the complexities found within community assemblages and ecosystems. However, advancement in our understanding of how ecosystem functional diversity interacts with structural and compositional diversity metrics is lacking, in part because universally applied methodologies to derive ecosystem functional classifications are still under development and vary widely across scales, extents and biomes. This study presents a methodology to construct ecosystem functional types (EFTs), or areas of the land surface that function similarly, using the MODIS NDVI record, for the terrestrial circumpolar Arctic. EFTs were derived from the seasonal dynamics of NDVI, over the Arctic tundra at 250 m resolution and compared to bioclimate subzones and to structurally and compositionally defined vegetation units of the Circumpolar Arctic Vegetation Map (CAVM). Correspondence analyses of CAVM EFTs to previously delineated CAVM bioclimatic subzones, physiognomic (vegetation) units and floristic provinces revealed a general congruence, indicating convergence across composition, structure, and function; yet also demonstrated substantial functional variability even within bioclimate subzones and vegetation units. Strong latitudinal gradients in ecosystem function are present, with EFT richness ranging from low (34) in northernmost regions to high (45) in southernmost regions. Locally, the mountainous regions of northern Alaska, and eastern and western Siberia had high spatial variability in ecosystem functioning. Aside from these generalities, we found that EFTs varied widely within individual mapped vegetation units, successfully capturing the functional dimension of biodiversity across the circumpolar Arctic tundra.

文章介绍

Ecosystem functional types of the circumpolar Arctic tundra based on the seasonal dynamics of vegetation productivity

Amanda Armstrong, Domingo Alcaraz-Segura, Martha Raynolds and Howard Epstein

通讯作者：

Amanda Armstrong，美国弗吉尼亚大学/美国马里兰大学ESSIC研究中心

期刊介绍

Environmental Research: Ecology

Environmental Research: Ecology（ERE）是一本多学科、金色开放获取的期刊，致力于以关于全球变化、弹性、减轻和适应影响的兼具科学进展和评估的方式，解决在环境科学、大尺度生态学、生物多样性和保护的交界领域的重要全球挑战。本刊为促进环境科学家、生态学家、资源管理者和政策制定者的对话提供了论坛。本刊鼓励所有的研究方法，包括定量、定性、实验、理论和应用方法。