农田生态条件下玉米秸杆腐解过程腐解物的热解变化特征  

Pyrolytic features of corn residues in the decaying process under field conditions

作　　者：张春慧 张一平[2] 窦连彬[3] 

机构地区：[1]天津市大港经济技术开发区管委会,天津300270 [2]西北农业大学资环系,陕西杨陵712100 [3]天津市大港区农林畜牧局,天津300270

出　　处：《生态学报》2000年第2期264-269,共6页Acta Ecologica Sinica

基　　金：国家教委高校博士点基金

摘　　要：用热分析法研究了农田生态条件下玉米秸杆腐解过程腐解物的热解变化特征 ,并探讨了腐解物中不同组分对腐解物热解特征的影响。结果表明 ,腐解物 DTA曲线的 2 80℃、3 3 0℃、4 50℃放热峰 ,DTG曲线的第二失重峰和 h330℃ /h4 50℃ 值可作为表征腐解进程的特征峰和特征值。由腐解物 DTA、DTG所得能量各参数 ( ΔH,E)与文献 [3 ]所述腐解物能态 ( Qv)呈现波动起伏 ,趋于稳定 2个阶段相符 ,二者相互印证 ,显示热分析方法用于植物残体腐解进程研究的可行性。 DTA的2 80℃放热峰主要由苯 -醇溶性物、水溶性物引起。苯 -醇溶性物、水溶性物和纤维素、半纤维素是影响腐解物热解及其能态变化特征的主要物质组分。This research proved that a thermal analysis could be used to study the plant residue decaying.Variations in pyrolytic features of corn residues in the decaying process was investigated under field conditions.The results show that 280℃,330℃,and 450℃ peaks of DTA curve and the second peak of DTG curve could be regarded as the featured peak' and the ratio of h 330℃ / h 450℃ as \'the featured index'.Energy parameters( ΔΗ,E )brought out such two stages as the fluctuating\|rolling stage and the stage which tended to be stable.The results show that 280℃ peak of DTA curve was mainly given by benzene\|alcohol soluble substances(b\|a) and water soluble substances(w);b\|a,w,cellulose,hemicellulose were the main components which affected pyrolitic feature.Lignin had a important function in the latter decaying period in which porolitic feature and energetics tended to be stable.

关 键 词：玉米秸杆 腐解物 热解 能态 

分 类 号：S154.34[农业科学—土壤学]