R K Varner

Dados Biográficos

ID6821994
NOMER K Varner
PRENOMESR K
SOBRENOMEVarner
ASSINATURAVARNER R K
AFILIAÇÕESUniversity of New Hampshire
ORCID0000-0002-3571-6629
VERIFICADOSim
TOTAL DE OBRAS5
TOTAL DE CITAÇÕES0
TOTAL COMO AUTOR5
TOTAL COMO EDITOR0
PRIMEIRO ANO DE PUBLICAÇÃO2014
ANO MAIS RECENTE DE PUBLICAÇÃO2025
ÍNDICE H0

  • Unraveling the depth-dependent causal dynamics of methanogenesis and methanotrophy in a high-latitude fen peatland

    Open AccessShuai Yang, Jinyun Tang et al.ARTICLEEnvironmental Research Letters2025

    The dynamics of methane (CH 4 ) cycling in high-latitude peatlands through different pathways of methanogenesis and methanotrophy are still poorly understood due to the spatiotemporal complexity of microbial activities and biogeochemical processes. Additionally, long-term in situ measurements within soil columns are limited and associated with large uncertainties in microbial substrates (e.g. dissolved organic carbon, acetate, hydrogen). To bette…

  • Soil incubation methods lead to large differences in inferred methane production temperature sensitivity

    Open AccessZhen Li, R F Grant et al.ARTICLEEnvironmental Research Letters2024

    Quantifying the temperature sensitivity of methane (CH 4 ) production is crucial for predicting how wetland ecosystems will respond to climate warming. Typically, the temperature sensitivity (often quantified as a Q 10 value) is derived from laboratory incubation studies and then used in biogeochemical models. However, studies report wide variation in incubation-inferred Q 10 values, with a large portion of this variation remaining unexplained. H…

  • Biogeochemical and socioeconomic drivers of above- and below-ground carbon stocks in urban residential yards of a small city

    Open AccessAlexandra R Contosta, Susannah B Lerman et al.ARTICLELandscape and Urban Planning2020

    Research on patterns of below-ground carbon (C) storage in urban lawns has focused on biogeochemical mechanisms, with human activities playing an important but somewhat secondary role. By contrast, studies of above-ground vegetation in urban areas have emphasized socioeconomic factors that influence greenness, abundance, and diversity, without explicitly considering biogeochemical mechanisms. Here we examine how both biogeochemical and socioecono…

  • Longer thaw seasons increase nitrogen availability for leaching during fall in tundra soils

    Open AccessClaire C Treat, W M Wollheim et al.ARTICLEEnvironmental Research Letters2016

    Climate change has resulted in warmer soil temperatures, earlier spring thaw and later fall freeze-up, resulting in warmer soil temperatures and thawing of permafrost in tundra regions. While these changes in temperature metrics tend to lengthen the growing season for plants, light levels, especially in the fall, will continue to limit plant growth and nutrient uptake. We conducted a laboratory experiment using intact soil cores with and without …

  • Effect of permafrost thaw on CO 2 and CH 4 exchange in a western Alaska peatland chronosequence

    Open AccessCarmel E Johnston, S A Ewing et al.ARTICLEEnvironmental Research Letters2014

    Permafrost soils store over half of global soil carbon (C), and northern frozen peatlands store about 10% of global permafrost C. With thaw, inundation of high latitude lowland peatlands typically increases the surface-atmosphere flux of methane (CH _4 ), a potent greenhouse gas. To examine the effects of lowland permafrost thaw over millennial timescales, we measured carbon dioxide (CO _2 ) and CH _4 exchange along sites that constitute a ∼1000 …