Soil greenhouse gas fluxes from 2011 to 2015 measured at the Mt. Kilimanjaro

DOI

Ten sites covering six different ecosystems were selected for detailed situ N2O and CH4 exchange measurements. The six different ecosystems represent main (semi) natural forest types along an elevational and thus climatic gradient (savanna, lower montane, Ocotea, and Podocarpus forest) as well as the main land-use gradient between 1,300–1,800 m a.s.l. (lower montane forest, homegarden, and coffee plantation). The initial sampling started in February 2011 on one transect (Machame) and included savanna, coffee plantation, homegarden, lower montane, Ocotea, and Podocarpus forest and lasted until July 2013. From September 2013 until end of 2015, we focused on additional forest sites and conducted more measurements at a lower montane, Ocotea and Podocarpus forest located at another transect (Mweka), Each site was equipped with at least 5 spatially replicated chambers (25.2 x 15.2 x 14.7 cm. Gas sampling was performed with 60 ml gas tight syringes equipped with a one-way LuerLock stop-cock (VWR International, Darmstadt, Germany). Each chamber was sampled five times during chamber closure(t0 = 0, t1 = 15, t2 = 30, t3 = 45, and t4 = 60 min). A total of 45 ml of headspace sample was taken and used to flush and finally over-pressurize(5 ml) 10 ml glass vials (SRI Instruments, Bad Honnef, Germany). The samples were shipped within 4 weeks to KIT, IMK-IFU (Garmisch- Partenkirchen, Germany) for further analysis using an auto sampler (HT200H; HTA s.r.l, Brescia, Italy) coupled to a gas chromatograph (8610 C; SRI Instruments, Torrence, USA) equipped with an electron capture detector (ECD N2O) and a flame ionization detector/methanizer (FID: CH4 and CO2). Samples were continuously calibrated with standard gas samples (N2O: 406 ppb; CH4: 2,110 ppb; CO2: 407.9 ppm, Air Liquide, Düsseldorf, Germany). Flux rates were calculated with R version 3.2.0 including HMR package 0.3.1 for calculating the GHG flux rates by linear increase or decrease in gas concentration over time (N = 5).

Soil greenhouse gases exchange is conducted to get a measure of N and C cycling between pedospher and atmoshphere. Data is combined from phase 1 and 2.Fluxes analysis = closed static chambers, manual measurements; chambers are closed for 1 h. During this time 5 single samples are taken at time 0, 15, 30 , 45, and 60. Fluxes are calculated with the concentrations from one sampling event for each chamber.

Identifier
DOI https://doi.org/10.1594/PANGAEA.912541
Related Identifier https://doi.org/10.1111/gcb.13944
Related Identifier https://doi.pangaea.de/10.1594/PANGAEA.894721
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.912541
Provenance
Creator Guetlein, Adrian; Kiese, Ralf ORCID logo; Gerschlauer, Friederike
Publisher PANGAEA
Publication Year 2020
Funding Reference German Research Foundation https://doi.org/10.13039/501100001659 Crossref Funder ID 107847609 https://gepris.dfg.de/gepris/projekt/107847609 Kilimanjaro Research Group
Rights Creative Commons Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Representation
Resource Type Dataset
Format text/tab-separated-values
Size 4689 data points
Discipline Earth System Research
Spatial Coverage (37.240W, -3.340S, 37.680E, -3.100N); Mount Kilimanjaro, Tanzania
Temporal Coverage Begin 2011-03-06T00:00:00Z
Temporal Coverage End 2015-09-21T00:00:00Z