Effects of glucose, acetic acid and oxalic acid additions on nitrogen mineralization and denitrification in red upland soil
In order to understand the coupling mechanism between the soil carbon and nitrogen in red upland soil,the effects of three kinds of carbon sources(glucose,acetic acid,oxalic acid) additions on the nitrogen mineralization and denitrification in red upland soil in central China area were investigated by a typical static incubation experiment carried out in the laboratory under 25 ℃ for 30 days.The results showed that the different carbon sources had diverse effects on nitrogen mineralization and denitrification of upland soil.Compared to the control treatment (CK),addition of glucose (Glu)significantly accelerated the decrease of soil dissolved organic nitrogen (DON) content and Glu significantly accelerated nitrous oxide (N2O) emission and reduced nitrate nitrogen (NO3--N) content in the first one day of incubation.Addition of ace acid (Ace) also significantly promoted the processes above (p ＜ 0.05) but faded next to Glu and there was no significant effect on the processes above after addition of oxalic acid (Oxa).After 30 days,the DON content of Glu,Ace and Oxa treatments were 14.84,19.46 and 23.47 mg· kg-1,decreased by 38.68％,19.59％ and 3.02％ than that of CK treatment (24.20 mg· kg-1),respectively;the NO3--N content of Glu,Ace,Oxa treatments were 8.77,13.89 and 20.42 mg· kg-1,decreased by 49.10％,19.38％ and increased 18.51％ than that of CK treatment (17.23 mg·kg-1),respectively.The research results showed that the availability of carbon sources is a key factor of accelerating the mineralization and denitrification of soil nitrogen.
red soilupland soilcarbon sourcesnitrogen mineralizationdenitritication
NETL
NSTL
万方数据
维普
