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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.
Taking the 23-year-old Huangpoluo artificial forest as the research object, the seasonal changes of total carbon (C), total nitrogen (N), unstructured C (TNC) Total C, total N, TNC and soluble N concentration.The results showed that TNC concentration accounted for 49% of the total C concentration and soluble N concentration of 26% of the total N concentration During the growing season, the ratio of TNC concentration to total C concentration increased from 42% of the first grade to 52% of the fifth grade, while the proportion of soluble N to total N decreased from 28% to 21% While the highest concentration of total N and the lowest concentration of TNC and soluble N were the lowest in summer.The increase of total C concentration in the first five roots reduced the concentration of TNC and soluble N and the increase of total N significantly decreased the concentration of TNC and increased the concentration of soluble N The correlation between total N and total C concentration and TNC concentration was enhanced, but the correlation with soluble N concentration was weakened.Nutritional TNC and soluble N concentration were closely related to total C and total N concentration.