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| Titel |
Impact of wood pruning to greenhouse gas emissions in three orchards and a vineyard |
| VerfasserIn |
Sonja Germer, Sarah Schleicher, Wolf-Anno Bischoff, Maider Gomez Palermo, Jürgen Kern |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250101951
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| Publikation (Nr.) |
 EGU/EGU2015-1220.pdf |
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| Zusammenfassung |
| Pruning of orchards and vineyards is usually burned or left on the soil for nutrient and organic
carbon recycling. Recently the interest rose to extract pruning for energetic use. Very few
studies exist that analyzed the effects of pruning removal on soil physical and chemical
characteristics. This is linked to the fact that changes are expected rather in the long term, but
project funding is typically restricted to 2 or 3 years. Some soil characteristics, however, as
organic carbon content and greenhouse gas emissions might also change on the short term as
our literature review reveals.
The main objective of this research is to determine if pruning extraction from
orchards and vineyards impact greenhouse gas emissions (N2O, CH4, and CO2) from
soil to the atmosphere, change soil nitrogen and carbon content or effect nitrogen
leaching. Results from our study and from the literature will be compiled to formulate
best management practices for sustainable pruning utilization from orchards and
vineyards.
Here we compare four different study sites in a block design over two rows each with two
parcels where we extracted pruning and two parcels where pruning was chipped and left on
the soil (n=4). Comparisons were made for initial soil chemistry and greenhouse gas
emissions in a cherry orchard without irrigation in Germany, a vineyard without irrigation in
France, an almond orchard with drip irrigation in Spain and a peach orchard with flood
irrigation in Spain. Soil greenhouse gas emissions depend on soil chemistry and soil
moisture. These characteristics can be expected to vary between the tree rows and
inter-rows of orchards. Therefore we took soil samples from row and inter-row positions
of each study site and analyzed them for chemical parameters (pH, total C, N, S,
and H, and available PO4, NH4, NO3, K, Mg, Ca). Additionally soil moisture and
temperature data have been recorded for tree rows and inter-rows in the cherry
orchard and the vineyard. Gas samples were taken with closed chambers twice a
month in both row positions from all four study sites. Results reveal some initial
differences of soil chemical parameter, in particular for the cherry orchard. No
pruning treatment effects were found during the first growing season after treatment
installation. We found, however, differences in CO2 emissions according to the sampling
position in the orchards during the summer months. CO2 emissions were higher in the
inter-row in vineyards than in the vine rows. In the cherry and almond orchard
the opposite was found with higher CO2 emissions in tree rows than inter-rows.
This finding indicates that possible pruning effects on greenhouse gas emissions
that might get apparent in the long term can vary according to sampling position. |
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