火烧对河北平泉油松林土壤微生物量的影响
发布时间：2019-06-22 12:42
【摘要】：以河北平泉油松林近期(火后半年)火烧迹地为研究对象,根据树干熏黑高度和树木死亡率情况,划分不同火烧强度(轻度、中度、重度),并以邻近未火烧区设置对照样地,采用氯仿熏蒸浸提法测定各研究区土壤微生物量碳、氮(C_(mic)、N_(mic)),分析不同强度火烧对其土壤微生物量碳、氮(C_(mic)、N_(mic))的影响。结果表明:不同强度火烧后土壤C_(mic)、N_(mic)含量均呈下降的趋势,不同土层间土壤C_(mic)、N_(mic)含量随土层深度增加而逐渐减小,土壤C_(mic)变化在34~205 mg/kg之间,土壤N_(mic)变化在7~40 mg/kg之间;土壤微生物量碳氮比(C_(mic)/N_(mic))整体处于5~6之间。双因素方差分析表明:火烧强度、土层深度及二者的交互作用对土壤有机碳(SOC)、全氮(TN)、铵态氮(NH+4-N)、硝态氮(NO-3-N)均有显著影响(P0.05),对于土壤p H值,仅火烧强度对其影响显著(P0.05);同时,火烧强度、土层深度及二者的交互作用对土壤C_(mic)和N_(mic)的影响均达到极显著水平(P0.01)。土壤养分(SOC、TN、NH+4-N和NO-3-N)主要集中在表层(0~10 cm),重度火烧后土壤养分含量显著减少,同时,土壤p H显著升高。相关分析结果表明:土壤有机碳、全氮对土壤C_(mic)、N_(mic)有极显著影响(P0.01),土壤C_(mic)、N_(mic)含量与土壤有机碳、全氮均呈正相关。主成分分析进一步表明土壤有机碳、全氮是影响土壤C_(mic)、N_(mic)的主要因素。
[Abstract]:Taking the burning site of Pinus tabulaeformis forest in Pingquan, Hebei Province (half a year after the fire) as the research object, according to the blackening height of trunk and the mortality of trees, different burning intensities (mild, moderate, severe) were divided into different burning intensities (mild, moderate, severe). The soil microbial biomass carbon and nitrogen (C _ (mic), N _ (mic),) were determined by chloroform fumigation extraction in the adjacent unburned areas. The effects of different intensities of burning on soil microbial biomass carbon and nitrogen (C _ (mic), N _ (mic) were analyzed. The results showed that the content of soil C _ (mic), N _ (mic) decreased with the increase of soil depth, the content of soil C _ (mic), N _ (mic) decreased with the increase of soil depth, the change of soil C _ (mic) was between 34 鈮，
本文编号：2504591
[Abstract]:Taking the burning site of Pinus tabulaeformis forest in Pingquan, Hebei Province (half a year after the fire) as the research object, according to the blackening height of trunk and the mortality of trees, different burning intensities (mild, moderate, severe) were divided into different burning intensities (mild, moderate, severe). The soil microbial biomass carbon and nitrogen (C _ (mic), N _ (mic),) were determined by chloroform fumigation extraction in the adjacent unburned areas. The effects of different intensities of burning on soil microbial biomass carbon and nitrogen (C _ (mic), N _ (mic) were analyzed. The results showed that the content of soil C _ (mic), N _ (mic) decreased with the increase of soil depth, the content of soil C _ (mic), N _ (mic) decreased with the increase of soil depth, the change of soil C _ (mic) was between 34 鈮，
本文编号：2504591
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