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用等容燃烧热(热值)表征植物残体腐解产物的能态,对大豆、玉米、油菜秸杆和小麦根茬腐解不同时期的腐解产物进行测定结果表明:(一)各植物残体腐解过程的能态在试验期间内都呈现出平缓变化和剧烈起伏变化两个阶段的共同动态变化规律。(二)各植物残体腐解产物能态水平高低的总趋势为大豆>玉米>油菜>小麦。(三)各植物残体腐解过程中,大豆秸杆有积能趋势,小麦根茬出现耗能趋势,玉米、油菜秸杆积能与耗能差异不明显。(四)植物残体腐解产物能态高低特征与产物的全氮量、木质素含量呈正相关。
The isothermal combustion heat (calorific value) was used to characterize the energy state of the decomposed products of plant residues. The determination of the decomposed products of soybean stalks, corn, rape straw and wheat stubble during different stages showed that: (1) During the experiment period, the energy state of the decay process showed a common dynamic change pattern between the two stages of gentle change and violent fluctuation. (2) The general tendency of the level of energy content of decomposed products of various plant residues is soybean> corn> rape> wheat. (III) During the decomposing process of various plant residues, the trend of accumulated energy of soybean straws and the trend of energy consumption of stubble in wheat showed that there was no obvious difference between energy accumulation and energy consumption of corn and rape straw. (4) The characteristics of the energy level of decomposed products of plant residues are positively correlated with the total nitrogen content and lignin content of the products.