配方施肥对华北落叶松各器官非结构性碳水化合物特征的影响OA北大核心CSTPCD

The objective of this study was to investigate the effect of formula fertilization on non-structural carbohydrates(NSC)of the leaves,branches,roots of Larix principis-rupprechtii to provide a reference basis for efficient fertilization technology of L.principis-rupprechtii.Trees of 32-year-old L.principis-rupprechtii were taken as the research objects,using a three-factor,three-level orthogonal design L9(34)with no fertilization as the control to investigate the monthly dynamic effects of formula fertilization on the NSC and component contents of the leaves,branches and roots,and to analyze the correlations of NSC and component contents of different organs.The results showed that 1)the content of non-structural carbohy-drates in the leaves,branches and roots changed significantly among different months,and the peak values were mostly found in October,and soluble sugars were the main component of NSC in all the three organs.2)The fertilization treatments differed in their performance on NSC and fraction content of the leaves,branches,roots.The NSC contents of the leaves and roots increased most significantly in treatments T4 and T8,with the average promotion of 29.65％and 23％,respectively,compared to the control.The soluble sugar and NSC contents of the branches,by contrast,showed a decrease trend when compared with the av-erage increase of the control.3)Correlation analysis showed that there was a highly significant and positive correlation between NSC and fraction content in the three organs(P＜0.01);the NSC content of root was negatively correlated to the soluble sugar content of both leaves and branches(P＜0.05).4)Nitrogen,phosphorus and potassium fertilizers exhibited certain effects on the NSC and component content;nitrogen fertilization had significant effect on the increase of NSC and component content of roots,while phosphorus and potassium fertilization had different effects on the significance of each index;the best fertilization treatment was N3P3K2(N 528.78,P 1621.58,K 172.98 g·plant-1).Appropriate N,P,K fertilization can effectively improve the NSC and component content of the leaves,branches and roots of L.principis-rup-prechtii,and there was a close relationship between mutual balance and dynamic allocation of different or-gans during the tree growth.