论文部分内容阅读
采用大田试验,对大麦掩青的矿化规律及大麦掩青量对烟草土壤养分的影响进行了较为系统的研究,研究结果表明:大麦掩埋后有机碳和氮的矿化速率的变化趋势基本一致,均分为3个阶段:快速分解期、渐缓分解期、缓慢分解期。大麦掩青量的增加能够提高土壤中速效氮含量,效果为T4>T3>T2>T1>CK。同时掩青量的增加提高了土壤中速效磷含量,T4效果最为明显。在整个生育时期,各处理土壤速效钾含量一致下降,大麦掩青提高了土壤中速效钾的含量,各处理不同时期土壤速效钾含量大小顺序为T4>T3>T2>T1>CK。大麦掩青条件下土壤中活性有机质含量变化较为明显,在移栽后75 d内,T4的土壤活性有机质含量一直增高,而其它处理则呈下降趋势。在整个生育期间,各处理土壤中活性有机质含量大小顺序均为T4>T3>T2>T1>CK。
Field experiments were conducted to study the effects of barley greening mineralization and barley green coverage on tobacco soil nutrients. The results show that the trends of mineralization rates of organic carbon and nitrogen are basically the same after barley burial , Are divided into three stages: rapid decomposition period, slow decomposition period, slow decomposition period. The increase of barley amount can increase the content of available nitrogen in soil, and the effect is T4> T3> T2> T1> CK. At the same time, the increase of the amount of cover green increased the content of available phosphorus in the soil, and the effect of T4 was the most obvious. During the whole growth period, the contents of available K in the treated soils decreased consistently, while that of barley in the blank treatments increased the content of available K in soils. The order of available K content in different treatments was T4> T3> T2> T1> CK. The content of active organic matter in soil was obviously changed under barley-covered condition. The content of active soil organic matter in T4 increased at 75 d after transplanting, while the other treatments showed a decreasing trend. During the whole growth period, the order of active organic matter content in soil was T4> T3> T2> T1> CK.