Abstract:

Three consecutive years of straw decomposition test was carried out with nylon bag to study the decomposition characteristics of rice straw in Western Heilongjiang. The results showed that, the decomposition of rice straw into stagnation period between every October to May the next year; the straw was into decomposition of from June to September. The change of the decay rate of rice straw is “fast - slow -slow”. On the first anniversary of decomposition, the rate of decay was greatly improved, the rate was 44.3%; on the second anniversary of decomposition, the rate of decay was relatively slow, the rate was 19.5%; on the third anniversary of decomposition, the change of decay was tends to be stable, the decomposing rate was 5.7%.

Key words: Heilongjiang, semi-arid areas of the cold region, rice straw, decomposition rate

摘要：

采用尼龙网袋翻埋法，连续3年进行秸秆腐解试验，研究了黑龙江西部地区水稻秸秆腐解规律变化特性。结果表明，每年10月至翌年5月，秸秆腐解进入停滞期；翌年6月至9月翻埋到水田中的秸秆进入腐解期。秸秆腐解速率年际间变化整体表现为“快-慢-慢”的升高过程。秸秆还田1周年时，秸秆腐解率大幅度提高，腐解率达44.3%；秸秆还田2周年时，秸秆腐解率提高相对减慢，腐解率为63.8%；秸秆还田3周年时，秸秆腐解率变化趋近于平缓，腐解率为69.5%。

关键词: 黑龙江, 寒地半干旱地区, 稻草, 腐解率