← Back to datasets

Total and partitioned soil respiration and below-ground carbon budget in SAFE intensive carbon plots

Open · Zenodo record 4542881 (concept 3266770) · Published Feb. 16, 2021

This dataset contains two parts: 1) 'data' worksheet: measured soil respiration, values of individual measurements across all plots. 2) 'Soil C cycle' worksheet: calculated summaries of the components of the below-ground carbon cycle, including total and component soil respiration (this study), soil carbon pools and flows of organic carbon (previous studies). These data form the basis of the below-ground carbon cycle in Riutta et al 2021 GBC. This sheet contains mean values in each 1 ha carbon plot. This worksheet include two addititional carbon plots from Lambir Hills National Park (see Kho et al. 2013 JGR), which are not part of the SAFE Project. SAFE Intensive Carbon Plots, part of the Global Ecosystem Monitoring (GEM) network, see http://gem.tropicalforests.ox.ac.uk/. Total soil respiration is measured at 25 points per plot, in the middle of each subplot (16 points per plot in OP, in subplot corners), using PVC collars of 10.65 cm internal diameter, inserted into approximately 5 cm depth. Partitioned respiration is measured at four points per plot, a using a cluster of six collars (see below). Disturbance experiment in the plot centre to assess the potential bias on fluxes caused by the collar installation. All the methods and installation is described in detail in the GEM Intensive Carbon Plots manual, available at http://gem.tropicalforests.ox.ac.uk/files/rainfor-gemmanual.v3.0.pdf. The aim is to measure monthly, but in practice the measurement interval is almost always longer (problems with access, staffing and instruments). EGM-4 infrared CO2 analyser and SRC-1 respiration chamber (PP Systems). Chamber closure time is 124 seconds, CO2 concentration inside the chamber is recorded every 5 s. Flux is calculated from the linear change in concentration in the chamber headspace. Conversion from parts per million (ppm) of total gas volume per second per unit collar area to mega grams (1 Mg = 10^6 g) of carbon per hectare per month. Idea gas law: pV=nRT --> n=pV/(RT) Mass-Mole: n=m/M --> m=n*M Combined: m=MpV/(RT) p (constant) 101,325 R (constant) 8.314472 T temperature in Kelvins --> AirT_Use + 273.15 V headspace volume M_carbon 12.01 parts per million to absolute units 10^-6 A collar area, m2 0.008825 m2 to hectare 10^4 grams to megagrams 10^-6 seconds to months 2592000 Flux_MgCha-1month-1 = Slope_ppm_s-1 * M* p* V /(R*T) * 10^-6 / A * 10^4 * 10^-6 * 2592000 Soil collar codes Partitioned respiration C1 All soil respiration components: litter, roots, mycorrhiza, soil organic matter (SOM) C2 Roots excluded (litter, mycorrhiza, SOM) C3 Roots and mycorrhiza excluded (litter, SOM) S1 Litter excluded (roots, mycorrhiza, SOM) S2 Litter and roots excluded (mycorrhiza, SOM) S3 Litter, roots and mycorrhiza excluded (only SOM) D1 Double litter, roots, mycorrhiza, soil organic matter (SOM) D2 Roots excluded (double litter, mycorrhiza, SOM) D3 Roots and mycorrhiza excluded (double litter, SOM) X Organic layer of the soil removed Disturbance The purpose of the disturbance experiment is to quantify how much disturbance the removal of the roots and mixing the soil causes, compared to just hammering in the deep collar ND1 Roots severed, not removed and soil not mixed at the installation ND2 ND1-ND5 are replicates, same treatmet ND3 ND4 ND5 D1 Roots removed, soil mixed at the installation D2 D1-D5 are replicates D3 D4 D5

2worksheets
0taxa
10/12locations resolved

Authors

Keywords

Funders

Permits

Worksheets

NameTitleFieldsRows
data Soil respiration data 21 20602
Soil C cycle Soil carbon cycle 41 11

Files

Taxa

0 GBIF taxa, 0 sequence-derived taxa.