Fine root distribution and turnover in a broad-leaved and Korean pine climax forest of the Changbai Mountain in China
-
摘要: 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827.8g/m2；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0～10cm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（P＜0.01）.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912.4g/m2，周转率为每年1.6次。Abstract: This study is focused on the vertical distributionproduction and turnover of the fine roots in a broadleaved and Korean pine climax forest of the Changbai Mountain Reserve．The results show that the average biomass of fine roots is 827∙8g / m2．The vertical distribution of fine roots accords with exponential regression curve and abundant fine roots are concentrated in the 0～1 0cm top soil．Soil bulk densitytemperatureand C and N content affect the fine root depth distribution significantly （ P＜0∙01）．In the broad- leaved Korean pine climax forestthe fine root climax production of the community occurs in July and Octoberbut the dominant arboreal speciesunderstory 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 speciesunderstory arboreal species and fine roots of grass dynamicthe annual production of community’ s fine roots is 912·4g / m2．
-
计量
- 文章访问数: 5462
- HTML全文浏览量: 117
- PDF下载量: 80
下载:
