氮钾对慈竹纤维素和木质素动态积累的调控效应

以慈竹为材料，通过施用不同比例的氮、钾肥，研究其对慈竹木质素和纤维素分布和动态积累的调控效应，为慈竹优质栽培提供理论依据。研究结果表明，氮钾肥处理并没有改变木质素和纤维素动态积累趋势，不同处理的慈竹木质素的动态积累呈先上升后下降的趋势，而纤维素的动态积累呈上升的趋势；慈竹不同部位木质素和纤维素的分布呈下部＞中部＞上部的趋势。施用氮、钾肥可以降低慈竹木质素含量，降低幅度为1.05%~3.97%，提高纤维素含量，提高幅度为1.25%～3.36%。N、K肥和时间对慈竹木质素和纤维素含量总变异的贡献都是N×K＞N＞TIME＞K＞N×K×TIME＞N×TIME＞K×TIME。慈竹纤维素和木质素含量之间呈不明显的正相关关系（r=0.020 4）。

Effects of Nitrogen and Potassium on Dynamic Accumulation of Lignin and Cellulose in Neosinocalamus affinis

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).