生物炭
壤土
肥料
浸出(土壤学)
农学
表土
野外试验
化学
环境科学
尿素
动物科学
土壤水分
热解
土壤科学
生物
有机化学
作者
Xia Liao,Deyan Liu,Yuhui Niu,Zengming Chen,Tiehu He,Weixin Ding
标识
DOI:10.1016/j.scitotenv.2021.145645
摘要
Abstract Biochar application is thought to improve crop yield and reduce N leaching and gas emissions; however, little is known about how field-aged biochar affects fertilizer N retention and N2O emissions. Here, a field microplot experiment is established in the North China Plain at maize season by applying 15N-labeled urea to the sandy loam soil both with (Biochar) and without (Control) application of 3-year field-aged biochar at 12 t ha−1. Overall, 25.6–26.2% of the urea N was taken up by maize aboveground biomass, field-aged biochar did not affect yield or fertilizer N recovery efficiency. After maize harvest, the residual ratio of applied N in the soil profile (0–40 cm) was 21.6 and 20.3% under Control and Biochar treatment, respectively, with an increase of 10.2% in the topsoil (0–20 cm) and decrease of 37.2% in the subsoil (20–40 cm) following biochar amendment, probably due to reduced NO3− leaching. Cumulative N2O emissions and urea N-induced N2O emissions under Control treatment were 2.06 and 0.78 kg N ha−1, and significantly decreased to 1.89 and 0.74 kg N ha−1 after Biochar treatment, respectively. N2O emissions derived from the applied N accounted for 38.0 and 39.4% of the total emissions under Control and Biochar treatment, respectively. N2O emissions from decomposition of soil organic N induced by the priming effect of the applied N was 0.69 and 0.56 kg N ha−1 under Control and Biochar treatment, respectively, contributing 33.7 and 29.7% of the total emissions. Overall, our results suggest that field-aged biochar increased the retention of fertilizer N in the topsoil by reducing NO3− leaching, while effectively reduced N2O emissions from fertilizer N and mineralization of organic N in the sandy loam soil.
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