TY  - JOUR
AU  - Liu, Shurong
AU  - Hu, Ronggui
AU  - Zhao, Jinsong
AU  - Brüggemann, Nicolas
AU  - Bol, Roland
AU  - Cai, Gaochao
AU  - Lin, Shan
AU  - Shaaban, Muhammad
TI  - Flooding effects on soil phenol oxidase activity and phenol release during rice straw decomposition
JO  - Journal of plant nutrition and soil science
VL  - 177
IS  - 4
SN  - 1436-8730
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2014-04528
SP  - 541 - 547
PY  - 2014
AB  - Phenol oxidase (Pox) plays a key role in soil C cycle and its presence may affect soil C mineralization during crop residue decomposition. To examine soil dynamics and relationships between Pox, phenols, Fe2+, and C mineralization, we designed a 53-d laboratory experiment conducted with and without rice straw addition and under non-flooded and flooded conditions. The results demonstrate that rice straw can indeed decompose faster under flooded conditions. The addition of rice straw significantly increased soil Pox activity (up to 15-fold), but only under flooded conditions. Rice straw application increased alkali extractable phenol (AEP) concentration by 129% at day 4. However, flooded conditions reduced soil AEP by 61% and 49% at day 53 with and without rice straw application, respectively. Phenol oxidase activity was positively correlated with dissolved organic C and Fe2+, while negatively related to AEP, which itself was positively correlated with C mineralization (i.e., CO2 emission rates). Also, all relationships between soil Pox, AEP, Fe2+, and C were stronger under flooded conditions. We therefore conclude that flooded conditions in paddy soil may promote straw decomposition as a result of the stimulation of Pox activity and phenol decomposition.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000339484300007
DO  - DOI:10.1002/jpln.201300356
UR  - https://juser.fz-juelich.de/record/155359
ER  -