冻融期去根处理对小兴安岭6种林型土壤微生物量的影响

发布时间：2018-05-01 17:39

本文选题：冻融循环 + 土壤微生物量碳氮　；参考：《生态学报》2016年19期

【摘要】：春季冻融期,在小兴安岭的阔叶红松(Pinus koraiensis)林、谷地云冷杉(Picea koraiensis-Abies nephrolepis)林、阔叶红松择伐林、白桦(Betula platyphylla)次生林、红松人工林、兴安落叶松(Larix gmelinii)人工林的去根处理样地和对照样地进行野外取土实验,分析了根去除对上述林型土壤微生物量的影响以及与土壤环境因子的关系。结果表明:冻融循环期间对照样地和去根处理样地的林型、土壤层次、取样时间均显著地影响土壤微生物量碳(MBC)(P0.05),对照样地中各林型的土壤微生物量氮(MBN)差异显著,而去根处理样地中各林型的MBN没有显著差异(P0.05);冻融循环期间去根处理显著地减少了大部分林型及土层(谷地云冷杉林0—10 cm及择伐林外)的MBC,而去根处理对大部分林型及土层(阔叶红松林0—10 cm,谷地云冷杉林和择伐林的10—20 cm除外)的MBN没有显著影响。说明在小兴安岭春季冻融期根系对土壤微生物量的影响不可忽视。
[Abstract]:During the freezing and thawing period in spring, in Pinus koraiensis forest, Picea koraiensis-Abies forest, selective cutting forest, Bai Hua Betula platyphylla secondary forest, Pinus koraiensis plantation, Pinus koraiensis plantation, The rooting treatment plots of Larix gmelinii (Larix gmelinii) plantation and field soil sampling experiments were carried out to analyze the effect of root removal on soil microbial biomass and the relationship between root removal and soil environmental factors. The results showed that during the freeze-thaw cycle, the forest type, soil level and sampling time significantly affected the soil microbial biomass (MBC) P 0.05 and the soil microbial biomass N (MBN) of different forest types in the same land. However, there was no significant difference in MBN of different forest types in root removal treatment, while root removal significantly reduced the MBN of most forest types and soil layers (0-10 cm and outside selective cutting forest) during freeze-thaw cycle, while root removal significantly reduced the effect of root removal on large forest types and soil layers. The MBN of some forest types and soil layers (0-10 cm in broad-leaved Korean pine forest, 10-20 cm in spruce fir forest and 10-20 cm in selective cutting forest) had no significant effect. The results showed that the effect of root system on soil microbial biomass could not be ignored during the spring freezing and thawing period in Xiaoxinganling.
【作者单位】：东北林业大学生态研究中心;
【基金】：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(IRT_15R09)
【分类号】：S714.3

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