Effect of Rice Vegetation and Water Management on Thrnover of Incorporated Organic Materials to Methane in a Korean Paddy Soil

논에서 시용 유기물의 메탄 전환율에 미치는 벼 식생 및 물관리의 영향

  • Received : 2003.01.20
  • Accepted : 2003.02.14
  • Published : 2003.02.28

Abstract

Turnover rate of applied rice straw and rice straw compost in a rice paddy soil under the flooding and intermittent irrigation was studied. The chambers in duplicate were either planted or unplanted with rice. For planted chambers, the turnover rate to methane under the flooding increased with freshness of organic materials applied: 14.9% for RS5 (rice straw applied in May), 9.5 % for RS2 (rice straw incorporated in February), and 4.0% for RSC (rice straw compost amended in May). Similar trend was found in turnover rate to methane under the intermittent irrigation: 9.8% for RS5, 5.5% for RS2, and 2.1% for RSC. For planted chambers, turnover rate to methane under the flooding was generally 1.64 times higher than that under the intermittent irrigation. In contrast, for unplanted chambers, the turnover rate to methane under the flooding increased with freshness of organic materials applied: 8.7% for RS5, 3.3% for RS2, and 3.0% for RSC. Similar trend was observed in chambers under the intermittent irrigation: 5.4% for RS5, 3.0% for RS2, and 1.4% for RSC. For unplanted chambers, the turnover rate to methane under the flooding was generally 1.52 times higher than that under the intermittent irrigation.

Keywords

Turnover rate;Organic material;Methane;Vegetation;Water management;Rice paddy soil

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