为降低香菇栽培对阔叶树资源的消耗 ,本文研究了不同栽培基质配方原始组分含量、呼吸消耗、基质失重对绝对生物学效率的影响及不同生育阶段木质纤维素的生物降解规律。结果表明 ,经优化配比的节木栽培基质 ,发菌阶段呼吸消耗失重率为 16 4 4 %～ 17 12 % ,出菇阶段木质素降解率为 73 83%～ 78 2 4 % ,整个生育过程木质纤维素降解率为 78 0 9%～ 79 77% ,绝对生物学效率为 10 2 2 %～ 11 4 1% ;节木栽培基质木质素的降解主要发生在出菇阶段 ,其降解率越高 ,绝对生物学效率越高 ,但木质素的降解率并不随木质素含量的升高而提高 ;木质素的降解尚需外源较易利用的碳源启动 In order to reduce the consumption of broad-leaved tree resources in mushroom cultivation, the effects of different components of primary culture medium, respiration and substrate weight loss on absolute biological efficiency and biodegradation of lignocellulose in different growth stages were studied. The results showed that the weight loss rate of respiration during the germination stage was 16 4 4% -17 12% and the rate of lignin degradation was 73 83% -78 2 4% The degradation rate of lignocellulose was 78 0 9% -79 77%, and the absolute biological efficiency was 10 2 2% ~ 11 4 1%. The degradation of lignin mainly took place in fruiting stage and the degradation rate was higher , The higher the absolute biological efficiency, but the degradation rate of lignin does not increase with the increase of lignin content; the degradation of lignin still need to start with a more accessible carbon source