农业环境科学学报2017，Vol.36Issue(12)：2544-2552,9.DOI:10.11654/jaes.2017-0845
不同生物质炭对酸化茶园土壤N2O和CO2排放的影响
Effects of different biochars on N2O and CO2 emission from acidified tea field soil
摘要
Abstract
An incubation experiment was conducted to determine the effects of the addition of three kinds of biochars(wheat straw, willow branches, and coconut shell)on acidified tea field soil properties and greenhouse gas emissions. In this experiment, the amount of biochar was 20 g·kg-1, whereas urea was used as an additional nitrogen source for nitrogen fertilizer treatment at the rate of 100 mg·kg-1. The results showed that biochar addition was beneficial to improve the pH value of acidified tea field soil, and the soil pH of the willow biochar addition treatment was 6.71, which was significantly higher than that of the other treatments. Significant differences were noted between the biochar treatments for soil dissolved organic carbon(DOC)content. Compared with that of the control treatment, the soil DOC content increased by 95.6％in the willow biochar treatment and decreased by 36.1％in the coconut shell biochar treatment, whereas no significant difference in DOC was noted in wheat straw biochar(P>0.05). The reduction of soil nitrification and denitrification rate caused by biochar applica-tion might have reduced soil N2O emissions, and the application of coconut shell biochar reduced N2O emissions to 91.7％, which was the most significant reduction. When combined with nitrogen application, willow biochar treatment caused significantly higher N2O emissions than those from the other biochar treatments. Compared with N2O emissions in wheat straw and coconut shell biochar treatments, the N2O e-missions in willow biochar treatment were considerably more sensitive to nitrogen addition. Biochar addition promoted CO2 emission from the soil, with the highest CO2 emissions from the willow biochar treatment and soil CO2 fluxes having significant positive correlation with pH val-ue and DOC contents. Moreover, nitrogen addition reduced the soil pH value and increased N2O emission, but had no significant effect on soil DOC content.关键词
生物质炭/N2O排放/CO2排放/pH/可溶性有机碳Key words
biochar/N2O emission/CO2 emission/pH/dissolved organic carbon分类
资源环境引用本文复制引用
孙贇,何志龙,林杉,张水清,柳维扬..不同生物质炭对酸化茶园土壤N2O和CO2排放的影响[J].农业环境科学学报,2017,36(12):2544-2552,9.基金项目
国家自然科学基金项目(41201255,41561068) （41201255,41561068）
国家重点研发计划项目(2017YFD0301103,2016YFD0200109) （2017YFD0301103,2016YFD0200109）
中央高校基本科研基金项目(2662016PY098) The National Natural Science Foundation of China(41201255,41561068) （2662016PY098）
The National Basic Research Program of China(2017YFD0-301103,2016YFD0200109) （2017YFD0-301103,2016YFD0200109）
The Fundamental Research Funds for the Central Universities(2662016PY098) （2662016PY098）
