Abstract: The effects of nitrogen and potassium on the distribution and dynamic accumulation of lignin and cellulose in Neosinocalamus affinis were studied through the different combinations of nitrogen and potassium applications. It aims to provide theoretical evidence for the quality cultivation of N.affinis. The results show that the dynamic accumulation of lignin and cellulose were the same as the control. The tendency of dynamic accumulation of lignin in N.affinis was firstly raised and then declined, but that of cellulose was raised. The distribution of lignin and cellulose was different. The bottom of stem was the highest, the top was the lowest. The lignin content could decrease 1.05%~3.97% through the application of nitrogen and potassium fertilizers, but the cellulose could increase 1.25%~3.36%, when compared with control. The contribution of nitrogen, potassium and time on the total changes of lignin and cellulose contents in N.affinis was N×K＞N＞TIME＞K＞N×K×TIME＞N×TIME＞K×TIME. The positive relationship of lignin content with cellulose content was not significant (r=0.020 4).

Key words: Neosinocalamus affinis, N-fertilizer, K-fertilizer, cellulose, lignin