Effect of land degradation on carbon and nitrogen pools in two soil types of a semi-arid landscape in West AfricaSalifouTRAOREUniversity of Ouagadougou, UNDESERT projectOuagadougou03 BP 7021Burkina FasoSalifouTRAORESalifouTRAOREassociatedPartyNybergGertCo-owner2015-02-20To determine the resilience of soil C pools during land degradation processes, field measurements and laboratory analyses were carried out in two constrating land cover and soil types. The field measurement consisted of routine soil descriptions and soil respiration, moisture and temperature for two consecutive essay dates (19–20th September 2012 at6 h–9 h a.m.
We analyzed the following soil parameters of 27 samples: proportion of aggregates, proportion of soil particle size, CEC, Available phosphorus, C and N content, and 13C and 15N signatures of soil organic C. Obtain permission from data set owner(s)The study area is located in northern Burkina Faso and characterized by semi-arid climatic conditions with an average annual precipitation ranging between 450 and 500 mm and 8-9 consecutive dry months (October-May). -0.0392-0.118114.039214.00922012-09-182012-10-30SalifouTRAOREUniversity of Ouagadougou, UNDESERT projectOuagadougou03 BP 7021Burkina Fasosalif.traore@gmail.com
Field measurements and laboratory analysis of soil
We selected two sites characterized by specific soil type with different land covers (degraded land and native land cover).
The sampling design was based on full factorial design (2x2) with two contrasting soil types (Cambisols, Luvisols) and two contrasting land covers (degraded land cover and native land cover). Field measurements of soil respiration were done on moist soil with a non-dispersive infrared gas analyser (EGM-4 CO2 Gas Analyzer).
Fine soil particle sizes (5 fractions) were determined for all samples using the Robinson pipette . The soil pH (H2O) was measured using a combination of electrodes in a soil-water solution ratio of 1:2.5, cation exchange capacity (CEC) was determined by the silver thiourea method (Reeuwijk, 2002) and available phosphorus by the Bray I method (Reeuwijk, 2002).
Aggregate fractionation isolate by wet sieving the macroaggregates (> 250 um), microaggregates (250-53 um) and clay+silt (< 53 um) .
Bulk soil and aggregate samples were analyzed for carbon and nitrogen content (C%, N%) as well as stable isotope ratio of the two elements, (13C, 15N) on an elemental analyzer-isotope ratio mass spectrometer (EA-IRMS) that was linked to an element analyzer (Carlo Erba CHN1110). The results of the isotope analysis are expressed as a δ value (‰) relative to the VPDB scale for 13C and the atmospheric nitrogen scale for 15N.
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