研究植物残体在田间条件下的分解速率以及土壤有机质含量的动态变化,目前最常用的方法是砂滤管法和尼龙袋法。这两种方法各有其优缺点,前者透水透气性好,不易破损,并能阻挡植物根系的进入,但因对管内外水分移动所产生滞后效应,特别是在干旱、半干 Studying the decomposition rate of plant residues under field conditions and the dynamic changes of soil organic matter content, the most commonly used methods are sand filter tube method and nylon bag method. The two methods have their own advantages and disadvantages, the former is permeable to water and breathable, not easily damaged, and can stop the entry of plant roots, but due to the hysteresis effect of water movement inside and outside the tube, especially in the arid, semi-dry