长白山原始阔叶红松林细根分布及其周转的研究

采用连续土钻分层取样法，对长白山自然保护区中原始阔叶红松林细根的垂直分布、生长和周转进行了研究. 结果表明，在原始阔叶红松林中，细根的平均生物量为827.8 g/m[[sup]]2[[/sup]]；细根在不同土层中的垂直分布符合指数曲线回归方程，大量的细根集中在0～10 cm土层. 通过回归分析发现，细根的垂直分布与土层容重、温度和碳、氮含量存在显著的回归关系（P0.01）. 在原始阔叶红松林中，群落细根的生长高峰发生在7月和10月，但其中主要树种、其他木本和草本的细根有着不同的生长动态，所以在计算细根生产量时应该分类计算，才会得出较为准确的结果. 通过对主要树种、其他木本和草本细根的分类计算，得出原始阔叶红松林中细根年生产量为912.4 g/m2，周转率为每年1.6次. 

Fine root distribution and turnover in a broad-leaved and Korean pine climax forest of the Changbai Mountain in China

This study is focused on the vertical distribution, production and turnover of the fine roots in a broad-leaved and Korean pine climax forest of the Changbai Mountain Reserve. The results show that the average biomass of fine roots is 827.8 g/m²The vertical distribution of fine roots accords with exponential regression curve and abundant fine roots are concentrated in the 0～10 cm top soil. Soil bulk density, temperature, and C and N content affect the fine root depth distribution significantly (P<0.01). In the broad-leaved Korean pine climax forest, the fine root climax production of the community occurs in July and October, but the dominant arboreal species, understory arboreal species and fine roots of grass have a different production dynamics. It is important to sort the fine root species because accurate fine root production sources have a different fine root dynamics. Based on the dominant arboreal species, understory arboreal species and fine roots of grass dynamic, the annual production of community’s fine roots is 912.4 g/m²