北京林业大学学报2017，Vol.39Issue(10)：70-77,8.DOI:10.13332/j.1000-1522.20160420
火烧对河北平泉油松林土壤微生物量的影响
Impact of fire on soil microbial biomass of Pinus tabuliformis forest in Pingquan County, Hebei of northern China
摘要
Abstract
In the burned area of Pinus tabuliformis forest in Pingquan County, Hebei of northern China, we measured soil microbial biomass carbon (Cmic), nitrogen (Nmic) of different fire intensity regions with a fumigation-extraction method after burned half a year. The study area was classified into different levels according to the smoked height and tree mortality: high-severity sites, middle-severity sites, low-severity sites and nearby unaffected sites. The purpose of our research was to explore the effects of different severity fire on Cmic and Nmic . The results showed that both Cmic and Nmic decreased after different intensity burning and gradually declined with the soil depth. Cmic ranged from 34-205 mg/kg;Nmic ranged from 7-40 mg/kg;Cmic/Nmic was wholly at 5-6. Two-way ANOVA showed that fire severity, soil layer and the interaction of the two factors had significant effects on soil organic carbon ( SOC) , soil total nitrogen ( TN) , NH4+-N, NO3--N ( P <0. 05 ) . However, soil pH was only positively correlated with fire severity ( P <0. 05 ) . Meanwhile, fire severity, soil layer and the interaction of the two factors had significant effects on Cmic and Nmic(P<0. 01). Soil nutrients were distributed mainly in the 0-10 cm layer and dropped sharply after the high-severity fire. Besides, soil pH increased significantly after the high-severity fire. The correlation analysis result showed that SOC and TN influenced the Cmicand Nmic extremely significantly (P<0. 01).The soil microbial biomass was positively correlated with SOC and TN. Principal component analysis further prove that SOC and TN are the main factors affecting Cmic and Nmic .关键词
林火/火烧强度/土壤理化性质/土壤微生物量Key words
forest fire/fire intensity/soil physiochemical characteristics/soil microbial biomass分类
农业科技引用本文复制引用
李伟克,刘晓东,牛树奎,李炳怡,刘冠宏,褚艳琴..火烧对河北平泉油松林土壤微生物量的影响[J].北京林业大学学报,2017,39(10):70-77,8.基金项目
国家重点研发计划项目(2017YFD060010006)、国家自然科学基金项目(31270696). （2017YFD060010006）
