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利用网袋法和砂滤管法模拟田间还田方式,研究不同处理下各有机物料有机碳的腐解特征。结果表明,网袋法玉米、大豆秸秆经过150 d后,其秸秆生物量有38.9%～46.6%被分解。秸秆还田分解趋势为:土埋处理>露天处理;土埋玉米秸秆>土埋大豆秸秆;露天大豆秸秆和玉米秸秆分解规律一致。从组织结构上看,玉米秸秆随着还田时间的增加,组织结构模糊、松散,基本组织和维管束遭到破坏,大豆秸秆组织结构变化不明显。不同还田方式下秸秆有机碳的分解规律为:玉米秸秆>大豆秸秆。在砂滤管模拟条件下玉米、大豆秸秆和根茬有机碳分解趋势基本相似,均表现为埋管初期分解较快,后期分解较慢,其有机碳分解率趋势为:玉米秸秆>大豆秸秆;降低C/N后,各有机物料有机碳分解率均高于不调节C/N。
Mesh bag method and sand filter method were used to simulate the field returning to field and the organic matter decomposition characteristics of organic materials under different treatments were studied. The results showed that the net biomass of straw and soybean stalk was decomposed by 38.9% ~ 46.6% after 150 days. The trend of decomposition of straw returning to field was: buried treatment> open-air treatment; soil-covered corn stover> soil-buried soybean stalk; the decomposition rules of open-air soybean stalk and corn stalk were the same. From the organizational point of view, with the increase of maize stalks time, the organizational structure is fuzzy, loose, the basic tissue and vascular bundles were destroyed, the organizational structure of soybean stalks did not change significantly. Under different ways of returning straw organic carbon decomposition law: corn stalks> soybean straw. Under the condition of sand filter tube simulation, the decomposition trend of organic carbon in corn, soybean stover and root stubble were basically similar, both of them showed rapid decomposition in the early stage of tube embedding and slow decomposition in later period. The trend of organic carbon decomposition rate was corn stalk> soybean stalk; After reducing C / N, the organic carbon decomposition rate of all organic materials was higher than that of non-adjusting C / N.