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首页> 外文期刊>Journal of plant nutrition and soil science >Flooding effects on soil phenol oxidase activity and phenol release during rice straw decomposition
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Flooding effects on soil phenol oxidase activity and phenol release during rice straw decomposition

机译：淹水对稻草分解过程中土壤酚氧化酶活性和酚释放的影响

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摘要

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, Fe~(2+), 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 Fe~(2+), while negatively related to AEP, which itself was positively correlated with C mineralization (i.e., CO_2 emission rates). Also, all relationships between soil Pox, AEP, Fe~(2+), 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.
机译：酚氧化酶（Pox）在土壤碳循环中起关键作用，其存在可能影响作物残渣分解过程中土壤碳的矿化作用。为了研究土壤动力学及其与Pox，酚，Fe〜（2+）和C矿化之间的关系，我们设计了一个53天的实验室实验，该实验在无水和无水条件下添加和不添加稻草。结果表明，稻草在淹水条件下确实可以更快地分解。稻草的添加显着增加了土壤痘病毒的活性（高达15倍），但仅在水淹条件下才有效。施用稻草在第4天可使碱提取酚（AEP）浓度增加129％。但是，在有和不使用稻草的情况下，淹水条件在第53天分别使土壤AEP降低61％和49％。苯酚氧化酶的活性与溶解的有机碳和Fe〜（2+）呈正相关，而与AEP则呈负相关，而AEP本身与C的矿化（即CO_2排放速率）呈正相关。此外，在淹水条件下，土壤中的Pox，AEP，Fe〜（2+）和C之间的所有关系都更强。因此，我们得出结论，稻田土壤中的水淹条件可能会由于Pox活性和苯酚分解的刺激而促进稻草分解。

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