北京林业大学学报2019，Vol.41Issue(2)：29-40,12.DOI:10.13332/j.1000--1522.20180339
林火对北京平谷区油松林土壤化学性质的影响
Effects of forest fire on soil chemical properties of Pinus tabuliformis forest in Pinggu District of Beijing
摘要
Abstract
[Objective] Based on the analysis of nutrient content, correlation and main nutrient ratio under different fire intensities in Beijing Pinggu District, the effects of forest fire on soil chemical properties of Pinus tabuliformis forest in Pinggu District, Beijing were studied. The reconfiguration of soil nutrient resources and their spatial differences provided a theoretical reference for vegetation restoration and management in burned areas. [Method] According to the fire intensity, the forest areas with lightintensity (L) , moderate fire (M) and heavy fire (H) were divided into research sites, and adjacent unfired forest land (C) was selected as control. The soil nutrient content of 0-10 cm, 10-20 cm, 20-30 cm after 0. 5 year fire was investigated and determined. The analysis method used single factor, twoway ANOVA, correlation analysis, and LSD post-test to research soil organic carbon (SOC) , total nitrogen (TN) , available nitrogen (AN) , ammonium nitrogen (NH+4-N) , nitrate nitrogen (NO-3-N) , total potassium (TK) , available potassium (AK) , total phosphorus (TP) , available phosphorus (AP) content, carbon to nitrogen ratio (C/N) , nitrogen to phosphorus ratio (N/P) under different fire effects.[Result] (1) In the same soil layer under different fire intensities, the forest fire had no significant effect on TN (P＞ 0. 05) , and had significant effect on TP (P ＜ 0. 05) , and had extremely significant influence on all other indexes (P ＜ 0. 01) . Under varied soil layers, the impact of forest fire on TK was not significant, and the impact on all other indexes was extremely significant (P ＜ 0. 01); all the soil nutrients were vertically distributed in the soil; (2) The burned fire made the soil SOC, TN, AN content showed a significant downward trend, and the TP, AP, TK, AK content showed an overall increase trend; (3) The slight over-fire caused the soil NH+4-N and NO-3-N content to decrease; the moderate over-fire caused the soil surface NH+4-N content to increase, the NO-3-N content to decrease, the lower layer NH+4-N content to decrease, and NO-3-N content increased; severe over-fire increased the content of NH+4-N in the soil and the content of NO-3-N in the soil surface, and the content of NO-3-N in the lower layer decreased. (4) The correlations between the main elements C, N and P were extremely significant (P ＜ 0. 01) , and the correlations between TK and other soil nutrients were not obvious (P＞0. 05) . (5) The C/N ratio decreased slightly after a mild to moderate over-fire, and rised after a severe over-fire. N/P decreased after over-fire, and the depth of soil layer increased before the over-fire, and vice versa after the over-fire, with the depth of soil layer decreased. [Conclusion] Forest fire has significant effects on soil chemical properties, and same fire intensity has varied effects on the soil chemical properties in different soil layers. Different fire intensities can cause significant changes in each soil chemical properties, and have important effects on the reconfiguration of soil nutrient resource.关键词
林火/火强度/油松林/土壤化学性质Key words
forest fire/fire intensity/Pinus tabuliformis forest/soil chemical properties分类
农业科技引用本文复制引用
刘冠宏,李炳怡,宫大鹏,李伟克,刘晓东..林火对北京平谷区油松林土壤化学性质的影响[J].北京林业大学学报,2019,41(2):29-40,12.基金项目
国家自然科学基金项目(31770696) （31770696）
