【生物炭对堆肥的影响】Cheng Wang † Haohao Lu † Da Dong † Hui Deng † P. J. Strong ‡ Hailong Wang § and Weixiang Wu *†. Insight into the Effects of Biochar on Manure Composting: Evidence Supporting the Relationship between N2O Emission and Denitrifying Community. Environ. Sci. Technol. 2013 47 (13) pp 7341–7349
Abstract
Although nitrous oxide (N2O) emissions from composting contribute to the accelerated greenhouse effect it is difficult to implement practical methods to mitigate these emissions. In this study the effects of biochar amendment during pig manure composting were investigated to evaluate the inter-relationships between N2O emission and the abundance of denitrifying bacteria. Analytical results from two pilot composting treatments with (PWSB pig manure + wood chips + sawdust + biochar) or without (PWS pig manure + wood chips + sawdust) biochar (3% w-w) demonstrated that biochar amendment not only lowered NO2–-N concentrations but also lowered the total N2O emissions from pig manure composting especially during the later stages. Quantification of functional genes involved in denitrification and Spearman rank correlations matrix revealed that the N2O emission rates correlated with the abundance of nosZ nirK and nirS genes. Biochar-amended pig manure had a higher pH and a lower moisture content. Biochar amendment altered the abundance of denitrifying bacteria significantly; less N2O-producing and more N2O-consuming bacteria were present in the PWSB and this significantly lowered N2O emissions in the maturation phase. Together the results demonstrate that biochar amendment could be a novel greenhouse gas mitigation strategy during pig manure composting.
【土壤磷酸盐和砷酸盐】Yanshan Cui †‡ and