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采用以空间代替时间的方法,对连栽杉木(Cunninghamialancelata(Lamb)Hook)人工林中采伐剩余树桩的分解过程进行了研究.根据Olson的分解模型,计算出连栽杉木纯林中树桩的分解速率为0.02695,树桩在分解过程中的前2年是一个氮素增加积累过程,当杉木树桩的C/N在463.2±27.3时开始净氮释放.树桩磷含量的变化与氮变化模式相类似,但钾的表现不同,钾的含量在树桩分解过程中一直是单调降低.利用固体高分辨核磁共振技术结合魔角旋转(MAS)和交叉极化(CP)技术,研究了杉木树桩的腐殖化过程及碳结构的变化.树桩中由纤维素和半纤维素组成的多糖碳和乙缩醛被首先分解,而由蜡质和表皮素等化合物组成的烷基碳,由酚类、木质素、单宁和石蜡等化合物组成的芳香族碳,及由酯、有机酸、酮和醛等化合物组成的羧基碳的分解速度较多糖碳和乙缩醛慢.
In this study, the decomposition process of remaining tree stumps in Cunninghamia lanceolata (Hook) Hook plantation was studied by using space instead of time.According to Olson’s decomposition model, the decomposition rate of stumps 0.02695, the first two years of stumps decomposition process is a process of nitrogen accumulation and accumulation, when the C / N of fir stumps begin to release at 463.2 ± 27.3, the change of phosphorus content in stumps is similar to the change pattern of nitrogen, Potassium performance is different, potassium content in the stump decomposition process has been a monotonous reduction.Using solid-state high-resolution nuclear magnetic resonance technology combined magic angle rotation (MAS) and cross-polarization (CP) technology, the study of the process of Chinese fir stump humification And carbon structure changes in the stump by cellulose and hemicellulose composed of polysaccharides carbon and acetal is the first decomposition, and by the wax and epidermal and other compounds composed of alkyl carbon, phenols, lignin, single Ning paraffin and other compounds composed of aromatic carbon, and esters, organic acids, ketones and aldehydes and other compounds composed of more decomposition rate of carbon-carbon and acetal slower.