%0 Journal Article
%A Liu, Shurong
%A Hu, Ronggui
%A Zhao, Jinsong
%A Brüggemann, Nicolas
%A Bol, Roland
%A Cai, Gaochao
%A Lin, Shan
%A Shaaban, Muhammad
%T Flooding effects on soil phenol oxidase activity and phenol release during rice straw decomposition
%J Journal of plant nutrition and soil science
%V 177
%N 4
%@ 1436-8730
%C Weinheim
%I Wiley-VCH
%M FZJ-2014-04528
%P 541 - 547
%D 2014
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000339484300007
%R 10.1002/jpln.201300356
%U https://juser.fz-juelich.de/record/155359