生物耕作下不同蔬菜茎秆还田腐解特征研究

摘要

The decomposition rate of straw returning of corn,taro,sweet potato and soybean were studied in fields using the method of nylon bag cover and soil cover,and the decomposition model of different vegetables was established.The results showed that the decomposition rate shows the characteristics of fast to slow after stalk re-turning during the test period,the decomposing rates of 4 vegetables stalk were 73.8%,95.9%,99.2% and 75.4%,respectively.The decomposition rate of T2 treatment(10 cm)was significant higher than that of T1 (0 cm)(P <0.05).Different vegetable stalk residue amount of days of natural logarithm regression equation was put forward,and it could predict the decomposition period of vegetable straw returning.%采用尼龙网袋法直接覆盖及覆土还田，研究了生物耕作下不同蔬菜（玉米、芋艿、山芋以及毛豆）茎秆还田后的腐解速率，建立了不同蔬菜的腐解模型。结果表明，蔬菜茎秆还田后，腐解速率表现出先快后慢的特征；在试验期内，玉米、山芋、芋艿以及毛豆等4种蔬菜茎秆的腐解率依次达到73．8％、95．9％、99．2％和75．4％， T2处理（10 cm）显著高于 T1（0 cm）；提出了不同蔬菜茎秆残留量自然对数的天数回归方程，可以预测蔬菜茎秆还田的腐解期限。