Effects of long-term application of biochar on organic carbon and its fractions in dry red soil
This study aimed to investigate the effects of long-term application of biochar on soil organic carbon(SOC)and its active fractions.A laboratory experiment was conducted to investigate the effects of short-term(1 month)application of biochar(BF)and three-year application of biochar(BA)on SOC and its fractions.The results showed that the application of BF significantly increased SOC content,particulate organic carbon(POC),easily oxidized organic carbon(EOC),light fraction organic carbon(LFOC),and microbial biomass carbon(MBC).The POC,EOC,LFOC and MBC increased by 97.5%-241.5%,21.8%-59.4%,66.8%-202.7%,and 83.7%-199.9%,respectively,relative to those observed with no biochar addition.Compared with BF,BA significantly reduced SOC,EOC,POC,and MBC levels but significantly increased dissolved organic carbon(DOC)content.Compared with no biochar addition,the carbon pool management index(CPMI)significantly increased in response to BF and BA treatments.The CPMI showed increases of 48.81%,89.73%,54.66%,and 157.48%in response to treatments with 1%BF,2%BF,1%BA,and 2%BA,respectively.The correlation analysis showed a significant and positive correlation between SOC content and MBC,POC,LFOC,and EOC levels.Therefore,the application of biochar can achieve soil carbon sequestration.However,with the extension of application years,the CPMI was significantly reduced,which reduced the stability of SOC.
biocharsoil organic carbonactive carbon fractionsoil carbon pool
万云星、牟金霞、杨婼妍、陈云忠、王誉琴、邵晓辉、朱启林、伍延正、但小倩、汤水荣、AHMED S. Elrys、孟磊
万方数据
维普
