Effects of short-term precipitation reduction on soil organic carbon mineralization and organic carbon fractions in Hainan rubber forests
In order to investigate the effects of short-term precipitation reduction on the changes of organic carbon mineralization rate and its carbon fractions in different soil layers,parameters such as soil organic carbon mineralization rate and organic carbon fractions under different precipitation conditions were determined by building a field isolated penetrating rain control platform and combining with indoor constant temperature incubation experiments using a typical plantation type of rubber forest soils in Hainan as the research object.The results showed that the short-term precipitation decreased the cumulative mineralization of SOC,the mineralization rate and the microbial metabolic entropy(qCO2)in the soil layer from 0 to 10 cm,and the contents of easily oxidizable organic carbon(EOC),microbial biomass carbon(MBC)and inert organic carbon(NEOC)decreased with the decrease of the soil water content,but the effect was only significant on the EOC in the soil layer from 0 to 10 cm.Correlation analysis showed that the cumulative mineralization of soil SOC and the mineralization rate of SOC were both signifiicantly and positively correlated with soil carbon and nitrogen contents(SOC,TN),the contents of each carbon fraction(EOC,MBC,NEOC),and qCO2.In conclusion,short-term precipitation reduction inhibited the mineralization of SOC in rubber forest soils,and this change may be closely related to the effectiveness of soil substrate supply and changes in microbial metabolism under different moisture conditions.
Rubber forestSoil water contentSoil organic carbon fractionMicrobial metabolic entropy
NETL
NSTL
万方数据
