التفاصيل البيبلوغرافية
| العنوان: |
Flooding effects on soil phenol oxidase activity and phenol release during rice straw decomposition. |
| المؤلفون: |
Liu, Shurong1,2, Hu, Ronggui1, Zhao, Jinsong1, Brüggemann, Nicolas2, Bol, Roland2, Cai, Gaochao1,2, Lin, Shan1, Shaaban, Muhammad1 |
| المصدر: |
Journal of Plant Nutrition & Soil Science. Aug2014, Vol. 177 Issue 4, p541-547. 7p. |
| مصطلحات موضوعية: |
*PHENOL oxidase, *SOIL composition, *EFFECT of floods on soils, *RICE straw, *CARBON cycle |
| مستخلص: |
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. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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