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大兴安岭火后不同恢复时期土壤微生物生物量动态变化

孙龙,武广源,胡同欣   

  1. (东北林业大学林学院, 哈尔滨 150040)
  • 出版日期:2017-11-10 发布日期:2017-11-10

Dynamic changes of soil microbial biomass in different restoration periods of Daxing’anling after fire disturbance.

SUN Long, WU Guang-yuan, HU Tong-xin*   

  1. (College of Forestry, Northeast Forest University, Harbin 150040, China).
  • Online:2017-11-10 Published:2017-11-10

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。

关键词: 森林生态系统服务价值, 非货币量核算, 京津冀, 能值, 货币量核算

Abstract: Wildfire is an important disturbance factor of the boreal forest ecosystem of China. With global warming, wildfire disturbance is much more serious. In this paper, the dynamic changes of soil microbial biomass carbon and nitrogen were measured at three different restoration stages of Dahurian larch (Larix gmelinii) forests after severe fire disturbance in the Daxing’an Mountains. The results indicated that the soil microbial biomass carbon and nitrogen increased at the beginning of the growing season and then decreased until the end of the growing season, and the microbial biomass carbon and nitrogen were higher in upper layer soil than in lower layer soil. The soil microbial biomass nitrogen in the plots 3 and 28 years after fire disturbance was higher than that in control plots, and vice versa in plots 9 years after fire disturbance. The soil microbial biomass carbon in plots 3 years after fire disturbance was lower than that in control plots, and vice versa in plots 9 and 28 years after fire disturbance. The soil microbial biomass carbon and nitrogen reached the maximum value in June and then decreased until the end of the growing season. There was a significant negative correlation between the soil microbial biomass carbon and phosphorus in upper layer in plots 9 years after fire disturbance. The soil microbial biomass nitrogen was negatively correlated with the soil water content in lower layer in plots 9 years after fire disturbance. The results of this study will provide a reference for assessing soil microbial biomass nitrogen and carbon and its impact factors after fire disturbance in boreal forest of China.

Key words: emergy, monetary accoun-ting, non-monetary accounting, Beijing-Tianjin-Hebei, forest ecosystem services value