中文摘要：

以23年生黄波罗人工林为研究对象,测定黄波罗1～5级根的全碳（C）、全氮（N）、非结构性C（TNC）和可溶性N浓度的季节变化,研究全C、全N、TNC及可溶性N浓度的相关性.结果表明：在黄波罗前5级根中,TNC浓度占全C浓度的49%,可溶性N浓度占全N浓度的26%;在生长季内,TNC浓度占全C浓度比例从1级根的42%增加到5级根的52%,而可溶性N占全N的比例从28%下降到21%;春季细根全C浓度最低而全N浓度最高,TNC和可溶性N浓度均是夏季最低.前5级根全C浓度增加降低了TNC和可溶性N浓度,全N浓度增加显著降低了TNC浓度,提高了可溶性N浓度.随着根序升高,全N和全C浓度与TNC浓度的相关性增强,而与可溶性N浓度相关性减弱.细根TNC和可溶性N浓度与全C和全N浓度关系密切.

英文摘要：

Taking a 23 years old Phellodendron amurense plantation as test object, the first five order roots of P. amurense were sampled to study the seasonal dynamics of their total carbon （TC）, total nitrogen （TN）, total non-structural carbohydrates （TNC）, and soluble N concentrations, with the correlations among these parameters analyzed. In the first five order roots, the TNC occupied 49% of TC, and the soluble N accounted for 26% of TN. Within the growth season, the rate of TNC to TC increased from 42% in the first order roots to 52% in the fifth order roots, and the rate of soluble N to TN decreased from 28% to 21% correspondingly. All the first five order roots had the lowest concentration of TC but the highest concentration of TN in spring, and the lowest concentrations of TNC and soluble N in summer. The increase of the TC concentration in the roots decreased the concentrations of TNC and soluble N, whereas the increase of the TN concentration decreased the TNC concentration significantly and increased the concentration of soluble N. From the first to the fifth order roots, the TC and TN had an increasing correlation with TNC but a decreasing correlation with soluble N, suggesting the close correlations of TNC and soluble N with TC and TN in P. amurense fine roots.