中文摘要：

【目的】对原生林及其皆伐后自然演替形成的次生林和造林形成的人工林的细根生物量及土壤特性进行研究,分析不同更新方式对细根动态分布的影响、了解细根与土壤特性之间的互动效应,为阐明森林生态系统中碳和养分循环以及为该地区森林恢复和森林经营提供理论依据。【方法】以小兴安岭南坡典型阔叶红松林、皆伐后天然更新的白桦次生林、皆伐后栽植的红松人工林和兴安落叶松人工林为研究对象,于2013年5—9月用连续钻取土芯法采集细根（直径≤2 mm）和土壤,测定细根生物量的垂直分布与季节动态,分析生物量与土壤特性的相关性。【结果】典型阔叶红松林、红松人工林细根生物量均显著高于白桦次生林和兴安落叶松人工林（P〈0.05）;各森林类型细根生物量的垂直分布存在显著差异（P〈0.05）,细根主要集中在0～20 cm土层中,其中白桦次生林0～20 cm土层中细根生物量占其细根总生物量的比例最高（75.81%）,典型阔叶红松林最低（62.73%）;各森林类型细根生物量存在季节性波动,各森林类型活、死细根生物量均有2个峰值;4种森林类型的细根生物量与土壤温度的相关性不显著,除典型阔叶红松林外,其他3种森林类型的细根生物量与土壤含水率极显著正相关（P〈0.01）,4种森林类型的细根生物量与土壤水解氮含量极显著正相关（P〈0.01）,白桦次生林的细根生物量与土壤有效磷含量显著负相关（P〈0.05）。【结论】本地区的顶极群落——典型阔叶红松林和以典型阔叶红松林的建群种为主要组成树种的红松人工林细根生物量显著高于以先锋树种白桦和兴安落叶松为主要组成树种的白桦次生林和兴安落叶松人工林;细根生物量在土壤中的分布具有明显的不均匀性,主要集中在养分含量较高的土壤表层,处于演替顶极阶段的森林较处于演替早期的森林?

英文摘要：

【Objective】In order to explore the effects of different regeneration pattern on the dynamic distribution of fine root biomass,and to examine the relationship between fine root biomass and soil properties,the fine root biomass and soil nutrient availability were investigated in primary forest,secondary forest and plantation,respectively. 【Method】This study was carried out in mixed broadleaved-Korean pine（ Pinus koraiensis） forest,secondary birch forest（ natural regeneration after clear cutting）,Korean pine plantation and Dahurian larch（ Larix gmelinii） plantation（ artificial planting after clear cutting）in Xiaoxing＇an Mountains. Fine roots（ ≤ 2 mm in diameter） and soil samples were collected by taking soil cores successively from May to September in 2013 for each forest type. 【Result】The results showed that fine root biomass in the mixed broadleaved-Korean pine forest and Korean pine plantation were significantly higher than that in secondary birch forest and Dahurian larch plantation. There were significant differences in the vertical distribution of fine root biomass in the four forest types. Fine root biomass was mainly distributed in 0- 20 cm soil layer,and the highest was in the secondary birch forest（ 75. 81%） and the lowest was in the mixed broadleaved-Korean pine forest（ 62. 73%）. There were seasonal fluctuations of fine root biomass in the four forest types. In each forest type,both fine root biomass and necromass showedtwo peaks. There was no significant correlation between soil temperature and fine root biomass in the four forest types,however,there was a highly significant positive correlation between soil moisture and fine root biomass in the three regenerated forest types（ except the mixed broadleaved-Korean pine forest）. The soil hydrolysis nitrogen content was highly significantly correlated with fine root biomass in all the four forest types. The available soil phosphate content was significantly negatively correlated with fine root biomass in the se