施肥模式对收获后稻田CO2释放的影响

Effects of fertilizer-modes on soil CO2 emission in post-harvest paddy

摘要:

为探讨施肥模式对收割后稻田CO₂垂直释放特征的影响,利用CIRAS-2便携式光合测定仪对施加氮肥、磷肥和菌肥的水稻土CO₂释放速率及其影响因素进行测定,并对二者的相关性进行分析．结果表明: 施加氮肥后,收割后稻田0 cm界面土壤CO₂的释放速率提高97.73％,10 cm界面和20 cm界面分别降低39.93％和31.36％．施加磷肥后, 收割后稻田0 cm界面CO₂的释放速率与对照(CK)差异无统计学意义,10 cm界面降低33.84％,20 cm界面提高48.03％．施加菌肥对收割后稻田3个界面CO₂的释放速率都无显著影响．收割后稻田CO₂释放速率与该界面土壤含水率的相关性受施肥模式的影响,其影响程度随着土层的加深依次减轻．与氮肥和磷肥相比,菌根菌肥对土壤CO₂释放影响不显著．

Abstract:

The release rate of soil CO₂ and its factors were measured with CIRAS-2 portable photosynthesis system, then their relationship was analyzed to investigate the influences of the additional nitrogen fertilizer, phosphate fertilizer and arbuscular fertilizer on characteristics of soil CO₂ release in paddy. The results showed that: (1) The addition of nitrogen fertilizer resulted in soil CO_2release rate rising by 97.73％ in 0 cm layer, and dropped by 39.93％ and 31.36％ in 10 cm and 20 cm layer, respectively. (2) While there was no significant difference between soil CO₂ release rates after the addition of phosphate fertilizer and of CK in 0 cm layer, the rate dropped 33.84％ in 10 cm layer and rose 48.03％ in 20 cm layer. (3) The additional arbuscular fertilizer had no significant influence on all three layers. (4) The related coefficients of soil CO₂ releasing rates and their factors in the same layers were affected by the fertilizer-modes, and its impact became lighter with the increasing of depth. Compared with nitrogen fertilizer and phosphate fertilizer, mycorrhizal fertilizer had no significant influence on the soil CO₂ release.