大兴安岭火后不同恢复时期土壤微生物生物量动态变化

发布时间：2018-05-22 17:36

本文选题：土壤微生物生物量氮 + 土壤微生物生物量碳　；参考：《生态学杂志》2017年11期

【摘要】：林火作为我国北方森林生态系统的重要干扰因子,随着全球气候变暖,其影响将更为严重。本文对大兴安岭地区兴安落叶松(Larix gmelinii)林重度火烧迹地3块不同恢复阶段1个生长季土壤微生物生物量氮、碳的动态变化进行了调查。结果表明:在整个生长季,土壤微生物生物量氮、碳都呈现先增加后减少的趋势,而且土壤上层微生物生物量氮、碳都高于土壤下层。火后3年和火后28年土壤上、下层微生物生物量氮高于对照样地,火干扰后9年土壤上、下层微生物生物量氮低于对照样地;火后3年土壤上、下层微生物生物量碳低于对照样地;火后9年和28年微生物生物量碳高于对照样地。火后不同恢复阶段土壤微生物生物量氮、碳在6月份达到峰值,然后在生长季中呈下降趋势。火后9年土壤上层微生物生物量碳与磷(P)含量呈显著负相关关系,火后9年土壤下层和火后28年土壤上层微生物生物量氮与土壤含水量呈正相关。本研究结果将为研究中国北方森林系统火后土壤微生物生物量氮、碳的动态变化及其火后的主要影响因子提供数据基础。
[Abstract]:Forest fire, as an important disturbance factor of forest ecosystem in northern China, will be more serious with the global warming. In this paper, the dynamic changes of soil microbial biomass nitrogen and carbon of Larix gmelinii (Larix gmelinii) forest in Daxing'anling region were investigated. The results showed that soil microbial biomass nitrogen and carbon increased first and then decreased during the whole growing season, and the biomass nitrogen and carbon of the upper soil were higher than those of the lower soil. Three years after the fire and 28 years after the fire, the microbial biomass nitrogen in the lower layer was higher than that in the same field, and in the soil nine years after the fire, the biomass nitrogen in the lower layer was lower than that in the same land; in the soil three years after the fire, The microbial biomass carbon in the lower layer was lower than that in the same field, and the microbial biomass carbon in 9 and 28 years after fire was higher than that in the same field. Soil microbial biomass nitrogen and carbon reached the peak in June and then decreased in the growing season. There was a significant negative correlation between microbial biomass carbon and P content in the upper layer of soil nine years after fire, and a positive correlation between microbial biomass nitrogen and soil moisture content in the lower soil nine years after fire and 28 years after fire. The results of this study will provide a data basis for studying the dynamic changes of soil microbial biomass nitrogen and carbon and the main influencing factors after fire in the forest system of northern China.
【作者单位】：东北林业大学林学院;
【基金】：国家自然科学基金项目(31470657)资助
【分类号】：S714.3;S762

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