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| Titel |
Soil CO2 flux in alley-cropping systems composed of black locust and poplar trees, Germany |
| VerfasserIn |
Tetiana Medinski, Dirk Freese, Christian Boehm |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250084898
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| Zusammenfassung |
| The understanding of soil carbon dynamics after establishment of alley-cropping systems is
crucial for mitigation of greenhouse CO2 gas. This study investigates soil CO2 fluxes in
alley-cropping systems composed of strips of black locust (Robinia pseudoacacia L.) and
poplar (Max 1) trees and adjacent to them crop strips (Lupinus). Soil CO2 flux was measured
monthly over a period from March to November 2012, using a LI-COR LI-8100A automated
device. Concurrently with CO2 flux measurements, soil and air temperature and soil moisture
were recorded within 10 cm of each collar. Soil samples were collected nearby each soil
collar for microbial C and hot water-extractable C analyses. At each study plot, root
biomass was measured to a depth of 15 cm. In all vegetation types, soil CO2 flux
increased from May to August, showing a significant positive correlation with air
and soil temperature, which can be a reflection of increase in photosynthesis over
the warm summer months. CO2 flux was the highest in poplar followed by black
locust and lupines. The relationships between CO2 flux, microbial biomass and hot
water-extractable carbon were not straightforward. Among the measured parameters, root
density was found to be the main factor to explain the higher CO2 flux in tree strips. |
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