Joint Action of the EFIATLANTIC / IEFC "Soils and Water Group Ander Arias-González Nahia Gartzia-Bengoetxea Lur Moragues-Saitua Bilbao- 2014/04/29 th
Carbon equilibrium in Earth Reservoir Carbon (Pg) Land-System Biomass 550 Soils 1500 Atmosphere 750 Oceans 38000 Geologic (fossil 4000 fuel) Total 44800
Carbon equilibrium in Earth Temperate forests: net carbon sink 0.7±0.2 Pg C/yr CO 2 production: Respiration from roots and microbial decmposition of SOM. Both processes depend on temperature (also on availability of water). Rate of decomposition depends on specific factors: soil texture, ph, nutrient availability etc. influencing the quality of the organic matter and the microbial community that performs decomposition.
Temperature sensitivity of the mineralization of organic matter in soils Represented by the Q 10 parameter The increase in the rate of reaction for every 10º C increase in temperature
Hypothesis We hypothesized that the decomposition of SOM is adapted to the SOM quality and the climatic conditions under which decomposition takes place. As a result: different temperature vs. decomposition curves for northern and southern soils
Reasons (1) Northern soils have accumulated incompletely decomposed SOM (2) Plant cover and therefore the quality of organic C input to the soil varies according to prevailing climatic conditions (3) Soil microbial community structure and its ability to utilize specific carbon substrates are adapted to prevailing conditions. However, microbial communities have the ability to adapt to new conditions, and different microbial communities may function in different ways under different conditions
What are we seeking? We want to homogenize the different factors that affect SOM decomposition to study the effect of climate on it. We shall select a network of stands under the same species, with soils of similar textural classes and homogeneous phs in a latitudinal gradient from South to North. This gradient may be used as a surrogate of climate change assuming that nowadays climate in some concrete places of this gradient may be similar to the climate some other part of it will have in the future.
Objective Soils formed in different geographical locations and conditions respond to temperature changes to evaluate its implications in the Climate Change feedback Determine temperature sensitivity of SOM decomposition covering a latitudinal gradient from South to North. Characterization of SOM in a latitudinal gradient from South to North. Characterization of soil microbial communities in a latitudinal gradient from South to North.
Partners Elena Vanguelova Peter Crow
Partners Mark Bakker Laurent Augusto Anne Budynek
Partners Nahia Gartzia-Bengoetxea Lur Moragues-Saitua Ander Arias-González
Partners Nieves Barros
Partners Margarita Alonso Santos María José Rozados Lorenzo
Partners Afonso Martins
Partners Manuel Madeira
Partners
Methods: Site selection Quercus robur stands On Acidic soils With sandy texture 3 sites per Region (replicates of Climate).
Methods: Site selection Quercus robur stands On Acidic soils With sandy texture 3 sites per Region (replicates of Climate).
Methods: Site selection
Methods: Sampling 4 different mixed samples and soil cores in each stand: (i) One L+F organic layers sample (ii) One H organic layer sample (iii) One mineral soil sample (5cm) (iv)five different mineral soil cores for Bulk density determination
Methods: Sampling In each stand 5 Q. robur trees will be randomly selected DBH Total height Height where the crown begins Crown cover Maximum and minimum crown radius
Methods: Sampling At half of the maximum crown: sampling site will be selected. Samples of 2000 cm 2 Organic Horizons: All the organic material present in the sampling site gathered. L+F together. The depth will be recorded H until mineral soil. Recording also the depth The L+F samples from each horizon and from the 5 trees mixed together. Mineral soil: same pointd: A cylinder of known volume will be taken for Bulk density determination (5 cm deep; 5 cm diameter). Another 3 similar cylinders (for analytical purposes) will also be collected (collection depth: 5 cm). These samples mixed together.
Methods: Analysis Physical fractionation of SOM Chemical fractionation of SOM
Methods: Analysis Forest floor chemical analysis Forest floor polyphenols Soil Texture
Methods: Analysis Thermal analysis and calorimetric measurements of soils
Methods: Analysis Microbial CNP measurements and associated enzymatic tests
Methods: Analysis Soil chemical analysis
Methods: Analysis Fibers in forest floor Soil respirations at 5, 15, 25ºC Substrate induced respirations DGGE analysis Ergosterol content
Methods: Analysis
Previous Results
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