火烧对北亚热带天然次生林土壤有机碳的影响

发布时间：2018-05-31 17:27

本文选题：天然次生林 + 火烧迹地　；参考：《南京林业大学学报(自然科学版)》2017年06期

【摘要】：【目的】研究火烧对北亚热带天然次生林土壤有机碳的影响,为火后森林生态系统恢复提供参考。【方法】以北亚热带天然次生林火烧迹地为研究对象,灾后1 a在火烧迹地和对照林地上分别设置20 m×20 m样地各5块,分层采集0~50 cm土层的土壤样品,测定各层土壤有机碳和土壤养分含量。【结果】火烧迹地土壤里含有的轻组有机质、易氧化碳、有机碳均比对照区域高,上升的幅度分别为1.2%~61.5%、9.6%~47.4%、3.9%~35.1%,且在0~10 cm土层的差异极显著(P0.01)。次生林火灾之后,轻组有机质、易氧化碳、总有机碳基本都存储于土壤表层,深度为0~20 cm。火烧迹地土壤0~50 cm的剖面中,含有的有机碳比对照区域高,上升的幅度约18.8%且差异显著。过火后土壤总有机碳、易氧化碳和轻组有机质与土壤养分(全氮、水解氮、速效钾)的相关性均达到极显著水平。【结论】天然次生林发生火灾1 a后,火烧迹地土壤总有机碳、土壤养分的增加主要集中在表层土壤中。
[Abstract]:[objective] to study the effect of burning on soil organic carbon in natural secondary forest of North subtropics, so as to provide a reference for the restoration of forest ecosystem after fire. [methods] the burning area of natural secondary forest in north subtropics was used as the research object. One year after the disaster, 5 plots of 20 m 脳 20 m sample land were set on the fire burning land and 5 plots of the control forest land respectively, and the soil samples of 0 ~ 50 cm soil layer were collected by stratification. The contents of organic carbon and soil nutrients in each layer of soil were determined. [results] the light organic matter, easily oxidized carbon and organic carbon contained in the burning soil were all higher than those in the control area, and the rising range was 1.2% 61.5% 9.610%, respectively. The difference was significant in the 0 ~ 10 cm soil layer (P _ (0.01). After secondary forest fire, light organic matter, easy carbon oxide and total organic carbon were stored in the surface layer of soil, with a depth of 0 ~ 20 cm. The content of organic carbon in the 0 ~ (50 cm) section of the soil in the burning area was higher than that in the control area, and the increase rate was about 18.8% and the difference was significant. The correlation between soil total organic carbon, easily oxidized carbon and light group organic matter and soil nutrients (total nitrogen, hydrolyzed nitrogen, available potassium) reached a very significant level after overfire. [conclusion] after 1 year of fire in natural secondary forest, the correlation between total nitrogen, hydrolyzed nitrogen and available potassium was very significant. The soil total organic carbon (TOC) and the increase of soil nutrient were mainly concentrated in the surface soil.
【作者单位】：杭州市富阳区万市镇林业站;中国林业科学研究院亚热带林业研究所;杭州市富阳区农林局;
【基金】：浙江省重点科技创新团队项目(2010R50030) 浙江省自然科学基金项目(LY12C03012) “十二五”国家科技支撑计划(2012BAC13B02)
【分类号】：S714.2

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