Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
This study presents results from continuous measurements of stem CO2 efflux carried out for seven experimental seasons (from May to October) in a young Norway spruce forest. The objectives of the study were to determine variability in the response of stem CO2 efflux to stem temperature over the season and to observe differences in the calculated relationship between stem temperature and CO2 efflux based on full growing season data or on data divided into periods according to stem growth rate. Temperature sensitivity of stem CO2 efflux (Q10) calculated for the established periods ranged between 1.61 and 3.46 and varied over the season, with the lowest values occurring in July and August. Q10 calculated using data from the full growing seasons ranged between 2.30 and 2.94 and was often significantly higher than Q10 calculated for the individual periods. Temperature-normalized stem CO2 efflux (R10) determined using Q10 from growing season data was overestimated when the temperature was below 10 °C and underestimated when the temperature was above 10 °C, compared with R10 calculated using Q10 established for the individual periods. The differences in daily mean R10 calculated by these two approaches ranged between -0.9 and 0.2 μmol CO2 m-2 s-1. The results of this study confirm that long periods for determining the temperature dependence of stem CO2 efflux encompass different statuses of the wood (especially in relation to stem growth). This may cause bias in models using this relationship for estimating stem CO2 efflux as a function of temperature.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1093/treephys/tpy006 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Apoplastic metabolomics reveals sugars as mesophyll messengers regulating guard cell ion transport under red light.
Nat Plants
August 2025
Department of Biology, Penn State University, University Park, PA, USA.
Guard cell pairs in the leaf epidermis enclose stomata, microscopic pores mediating CO uptake and water loss. Historical data suggest that signals from interior mesophyll tissue may modulate guard-cell regulation of stomatal apertures, but the molecular identity of any metabolite-based signals has remained elusive. We discovered that extracellular (apoplastic) fluid from Arabidopsis thaliana and Vicia faba enhances red-light-induced stomatal opening.
View Article and Find Full Text PDFEnhanced Rock Weathering Altered Soil Organic Carbon Fluxes in a Plant Trial.
Glob Chang Biol
August 2025
Bio-Based Sustainability Engineering Research Group, Department of Bioscience Engineering, University of Antwerp, Antwerp, Belgium.
Enhanced rock weathering (EW) is gaining attention as a promising carbon dioxide removal strategy, primarily due to its potential to sequester inorganic carbon through mineral dissolution. However, the broader biogeochemical implications of EW, particularly its effects on soil organic carbon (SOC) dynamics, as well as the role played by agriculturally relevant biota such as plants and earthworms, remain poorly understood. In a 15-month mesocosm experiment with Zea mays, we investigated how EW with basalt influences soil CO efflux (SCE; normalized for soil water content and temperature) and how this is modulated by plant and earthworm presence.
View Article and Find Full Text PDFSoil Respiration Responses to Prolonged Warming Vary Seasonally in a Subarctic Grassland.
Glob Chang Biol
August 2025
Department of Ecology, Universität Innsbruck, Innsbruck, Austria.
Northern ecosystems are warming rapidly, but the effects on soil carbon (C) dynamics are not fully understood. In particular, it is unclear whether warming effects on soil respiration (SR) -the primary source of atmospheric CO from terrestrial ecosystems- persist throughout the year or vary seasonally. While both summer and cold-season processes shape annual soil C fluxes, the long cold season, which dominates high-latitude regions, has received far less attention.
View Article and Find Full Text PDFSeasonal drought shapes the relationship between stem CO efflux and belowground respiration in an even-age rubber plantation on Hainan Island, China.
Front Plant Sci
July 2025
Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, China.
Introduction: Stem CO efflux ( ) reflects the amount of photo-assimilated carbon released back into the atmosphere and plays a critical role in the carbon balance of tree and forest ecosystems. Despite previous studies indicating that a portion of stem CO originates from root respiration ( ), the seasonal dynamics of and its relationship with belowground respiration remain poorly understood, particularly in tropical regions characterized by distinct dry and wet seasons.
Methods: To address this gap, we investigated in tapping and non-tapped rubber trees, along with environmental factors and physiological traits (sap flow flux density, root respiration, and leaf area index) from 2018 to 2021.
Spatial and temporal variation in the natural source zone depletion rates of two types of LNAPL sources.
J Contam Hydrol
July 2025
State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing, Beijing 102249, China; College of Chemical Engineering and Environment, China University of Petroleum-Beijing, Beijing 102249, China. Electronic address:
Accurate measurement of natural source zone depletion (NSZD) rates is a crucial but challenging task at a large site since NSZD rates usually have large temporal and spatial variation. Few studies focus on the spatial and temporal variability of NSZD rates of different types of light non-aqueous phase liquid (LNAPL). This study has explored the spatial and temporal variability of NSZD rates at one site with two chemically distinct LNAPL bodies (aliphatic-rich naphtha for Source Zone #1 vs aromatic-rich pyrolysis gasoline for Source Zone #2).
View Article and Find Full Text PDF