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以辽宁东部山区16年生日本落叶松人工林为对象,探讨施肥对落叶松1～5级不同根序等级细根养分浓度的变化.结果表明:不同根序等级细根全碳浓度差异不显著,施肥对各级根序全碳浓度没有显著影响;在前5级根序中,1级根非结构性碳水化合物(TNC)浓度最低,N和P浓度最高;而5级根TNC浓度最高,N和P浓度最低.TNC浓度随着根序增加而升高,N和P浓度则相应下降.施肥仅对1级根组织中N和P浓度有显著影响;不同根序根组织中C/N/P具有明显差异,1级根平均C/N/P为423∶16∶1,5级根为726∶16∶1,随着根序增加,C在3种元素中的比例显著增加,而N的比例变化不大.施N肥并没有改变C的比例;但施P肥或施N+P肥均降低了前3级根(0～10cm)或前2级根(10～20cm)C和N在3种元素中的比例.
The results showed that there was no significant difference in fine root carbon concentration of different root orders among the different root orders, with the 16-year-old Larix kaempferi plantation in eastern Liaoning as an example, There was no significant effect of fertilization on the total carbon concentration at all levels. In the first five root orders, the lowest concentration of non-structural carbohydrates (TNC) of the first root and the highest concentration of N and P were observed. And the lowest concentration of P.The concentration of TNC increased with the increasing of root length and the concentration of N and P decreased correspondingly.The fertilization had a significant effect on the concentration of N and P in the root tissue of the first grade.The C / N / P had obvious difference. The average root C / N / P of the first root was 423:16:1, the second root was 726:16:1, and the proportion of C in the three elements increased significantly with the increase of the root, while N The proportion of C fertilizer was not changed much.The application of N fertilizer did not change the proportion of C, but the application of P fertilizer or N + P fertilizer reduced the C (subscript h) and the former two (10-20 cm) N in three kinds of elements in the ratio.