火烧对北亚热带杉木林土壤有机碳的影响  

Effects of Fire on Soil Organic Carbon of Cunninghamia lanceolata Stands in North Subtropical Area

作　　者：赵志霞[1] 李正才[1] 周君刚 程彩芳[1] 赵睿宇 孙娇娇 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江杭州311400 [2]浙江省杭州市富阳区农林局,浙江杭州311400

出　　处：《林业科学研究》2016年第2期301-305,共5页Forest Research

基　　金：浙江省重点科技创新团队项目(2010R50030);浙江省自然科学基金项目(LY12C03012);"十二五"国家科技支撑计划项目(2012BAC13B02)

摘　　要：林火作为森林生态系统中最活跃的因子之一,通过直接燃烧损失、有机质高温变性、继发性侵蚀作用,以及改变碳的输入、输出过程而改变土壤碳库[1],进而影响和改变整个系统的碳循环和碳分布格局[2]。据统计,森林火灾每年向大气中释放的碳量相当于化石燃料燃烧的70%[3]。[Objective]To study the effect of burning on soil organic carbon and to provide references for post-fire vegetation regeneration. [Method]The changes of organic carbon and nutrient contents in post-fire Cunninghamia lanceolata stand with the soil depth of 0 50 cm in north subtropical areas were analyzed. [Result]The contents of soil total organic carbon（ TOC）,easily-oxidized carbon（ EOC） and light fraction organic carbon（ LFOM） were higher than those of contrast sample area,which increased by 1. 7% 38. 0% 、6. 6% 33. 2% and 3. 1%45. 7%,respectively. Significant differences were found in the soil layer with depth of 0 10 cm and 10 20 cm（ P 0. 01）. Compared with the contrast sample area,the soil carbon storage in the layer with depth of 0 50 cm increased by 19. 1% one year after burning. The TOC,EOC and LFOM were all significantly related to the soil nutrients（ total N,hydrolyzable N and available K）. After burning,the increase of TOC,EOC and LFOM were mainly concentrated on the surface of soil and the organic carbon contents increased by 9. 22 g·kg- 1in 0 10 cm layer. [Conclusion]Moderate intensity burning has a significant impact on organic carbon in the soil of C. lanceolata stand in the north subtropical area. Moderate burning can increase the soil organic carbon because the soil can mix the organic residues caused by incomplete combustion of vegetation layer. Replanting in the burned area could be adopted to promote the vegetation restoration.

关 键 词：杉木 火烧 土壤有机碳储量 土壤活性有机碳 土壤养分 

分 类 号：S791.27[农业科学—林木遗传育种]