Pedosphere 25(5): 761--769, 2015
ISSN 1002-0160/CN 32-1315/P
©2015 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Short-term response of soil respiration to addition of chars: Impact of fermentation post-processing and mineral nitrogen |
G. LANZA1 , S. WIRTH2, A.
GESSLER2,3 and J. KERN1 |
1Leibniz Institute for Agricultural Engineering,
Max-Eyth-Allee 100, Potsdam 14469 (Germany)
2Leibniz Centre for Agricultural Landscape Research
(ZALF), Eberswalder Stra\betae 84, Muncheberg 15374
(Germany)
3Swiss Federal Institute for Forest, Snow and
Landscape Research WSL, Zurcherstrasse 111, Birmensdorf
CH-8903 (Switzerland) |
| ABSTRACT |
| The biodegradability of chars derived from pyrolysis and
hydrothermal carbonisation (HTC) was studied in short-term
dynamic incubation experiments under controlled conditions.
Carbon dioxide C (CO2) emissions from soil-char mixtures in combination
with solid digestate or mineral nitrogen (N) fertiliser were measured
in dynamic chambers for 10 d. Compared to the original
material (maize straw), pyrolysis and HTC chars showed
significantly lower CO2 emissions and slower decay
dynamics; and compared to the soil control, HTC char
increased soil respiration to a significant extent, while
pyrolysis char did not. The addition of mineral N resulted
in a delayed respiration dynamics for HTC char, while the
addition of digestate resulted in an increase in the
respired CO2 for pyrolysis char and a decrease for HTC
char. For the first time, a peculiar two-stage decay
kinetics was observed for HTC char, indicating a highly
inhomogeneous substrate consisting at least of two C pools. |
| Key Words: biodegradability, CO2 emission,
decay dynamics, hydrothermal carbonisation char, pyrolysis
char |
| Citation: Lanza, G., Wirth, S., Gessler, A. and Kern, J. 2015. Short-term response of soil respiration to addition of chars: Impact of fermentation post-processing and mineral nitrogen. Pedosphere. 25(5): 761-769. |
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