小兴安岭6种森林类型土壤微生物量的季节变化特征

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 小兴安岭6种森林类型土壤微生物量的季节变化特征 DOI: 10.5846/stxb201304050608 作者: 作者单位: 东北林业大学,东北林业大学生态研究中心;黑龙江省森林工程与环境研究所,东北林业大学 作者简介: 通讯作者: 中图分类号: 基金项目: 林业公益性行业科研专项资助项目（201204320）；长江学者和创新团队发展计划资助项目（IRT1054） Seasonal dynamics of soil microbial biomass in six forest types in Xiaoxing’an Mountains, China Author: Affiliation: Center for Ecological Research, Northeast Forestry University,,Center for Ecological Research, Northeast Forestry University Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:土壤微生物是森林生态系统的重要调节者和分解者，其微生物量是陆地生态系统碳氮循环的重要组成部分。采用氯仿熏蒸浸提法测定了小兴安岭6种森林类型不同季节的土壤微生物量碳（MBC）和氮（MBN），并分析了其与土壤环境因子的关系，探讨根系去除对土壤微生物量的影响。结果表明：MBC和MBN的季节变化因森林类型的差异而有所不同，但最高值多发生在8月中旬；MBC和MBN在根系去除后均有不同程度的减少；MBC和MBN分别与土壤有机碳、全氮及含水量呈显著正相关（P < 0.05）；MBN与土壤温度呈极显著正相关（P < 0.01）。显然，研究区的土壤微生物量受土壤温度、湿度及土壤有效养分综合作用的影响。 Abstract:Soil microbes are the most important regulator and decomposer in the forest ecosystem. Soil microbial biomass is an important component of the carbon and nitrogen cycles in the terrestrial ecosystem. The Heilongjiang Liangshui Nature Reserve has full gradient interference, which includes virgin forests, secondary forests, and plantation forests. The reserve provides a good platform to explore soil microbial biomass and to determine the factors influencing soil microbial biomass in the Xiaoxing'an Mountains. We used the chloroform fumigation extraction method to measure and compare the microbial biomass carbon (MBC), the microbial biomass nitrogen (MBN), and the influencing factors (i.e., soil organic carbon, soil total nitrogen, soil water content and soil temperature) throughout the growing season. We also explored the effect of root removal on soil microbial biomass. The experiment included six typical forest types, namely, virgin mixed broadleaved-Korean pine (Pinus koraiensis) forest, selectively cut mixed broadleaved-Korean pine forest, secondary birch (Betula platyphylla) forest, artificial larch (Larix gmelinii) plantation, artificial Korean pine forest, and valley spruce-fir (Picea-Abies) forest. Each forest type consists of three 20 m × 30 m plots, and four 2 m × 2 m root trenching subplots and four 2 m × 2 m control subplots were randomly chosen in each plot. Soil samples from 0 cm to 10 cm soil layers were randomly selected monthly from the six forest types from June 2010 to October 2010. The samples in each plot were mixed as one sample to determine MBC and MBN. Results show that the seasonal changes in the soil microbial biomass of the six forest types were different during the study period. The maximum soil microbial biomass was mostly obtained in mid-August. The MBC and MBN generally showed similar seasonal dynamics in the control and root removal plots. The average values of MBC and MBN for the six forest types varied from 383.5 mg/kg to 1633.6 mg/kg and 47.6 mg/kg to 231.0 mg/kg, respectively, accounting for 1% to 2% and 2% to 4% of the soil organic carbon and nitrogen content. The average soil microbial biomass (MBC and MBN, respectively) of each forest type was recorded as follows: secondary birch forest (1318.8 and 215.5 mg/kg) > artificial Korean pine forest (1137.3 and 169.1 mg/kg) > selectively cut mixed broadleaved-Korean pine forest (980.3 and 153.4 mg/kg) > virgin mixed broadleaved-Korean pine forest (948.9 and 143.6 mg/kg) > artificial larch forest (927.2 and 131.0 mg/kg) > valley spruce-fir forest (606.2 and 95.0 mg/kg). Root removal significantly decreased soil microbial biomass (P < 0.01). The maximum MBC (44%) and MBN (34%) reductions were found in the valley spruce-fir forest and the artificial larch forest, respectively. The minimum MBC (12%) and MBN (11%) reductions were found in the selectively cut mixed broadleaved-Korean pine forest. MBC and MBN were significantly positively correlated with soil organic carbon, soil total nitrogen, and soil water content (P < 0.05), and MBN was significantly positively correlated with soil temperature (P < 0.01). We concluded that the combined effects of soil temperature, soil water content, and soil nutrients contributed to the differences in the soil microbial biomass found across the six forest types. 参考文献 相似文献 引证文献