中国生态农业学报2017，Vol.25Issue(9)：1254-1265,12.DOI:10.13930/j.cnki.cjea.170298
生物炭施用下中国农田土壤N2O排放的Meta分析
Meta-analysis on farmland soil N2O emissions under biochar application in China
摘要
Abstract
In this study, a Meta-analysis was conducted to make clear the effects of biochar application on soil N2O emissions and the main controlling factors in China. Based on observation data from published papers in the public domain, the effects of biochar application on soil N2O emissions were quantitatively analyzed under different climatic conditions, soil properties, field management practices and biochar properties. Then path analysis was used to determine the dominant factors influencing soil N2O emissions. The results showed that biochar application significantly decreased soil N2O emissions (P< 0.05) under annual mean precipitation more than 600 mm, and the reduction effect was strengthened with increasing annual mean precipi-tation. Also when annual mean sunshine hours was greater than 1000 h, the N2O emission-reduction effect of biochar applica-tion decreased in trend following an initial increase with increasing annual mean sunshine hours. With increasing soil pH above 6.5, soil N2O emission reduction first increased and then decreased under biochar application. Biochar application sig-nificantly decreased soil N2O emissions in loam soils (P< 0.05), whereas the effects in sandy and clay soils were not signifi-cant (P> 0.05). Moreover, the reduction in soil N2O emissions under film mulching was higher than that without film mulch-ing. The effect of biochar on soil emission decreased with increasing nitrogen application rate, but increased with increasing specific surface area of biochar. When C:N ratio of biochar was 30-500, the effects of biochar application on soil N2O emis-sions was significant at P< 0.05. When the amount of biochar was 20-160 t·hm-2, soil N2O emissions significantly decreased with increasing biochar application rate. Furthermore, significant differences in N2O emissions were observed for different regions under biochar application. For example, there was a significant reduction in N2O in South, East, Central and Northeast regions of China (P< 0.05), except Northwest China (P> 0.05). Generally, N fertilizer input, biochar application amount, annual mean temperature and annual mean precipitation were the dominant factors affecting the N2O emission-mitigation ef-fects of biochar, which was controlled by the interactions among these factors. The study provided a reference base for the promotion of biochar technology in farming in China and emission reduction of soil N2O.关键词
生物炭/氧化亚氮/减排效果/气象因素/土壤性质/田间措施Key words
Biochar/Nitrous oxide/N2O emission-mitigation effect/Meteorological factor/Soil property/Field management practice分类
农业科技引用本文复制引用
罗晓琦,冯浩,刘晶晶,张阿凤..生物炭施用下中国农田土壤N2O排放的Meta分析[J].中国生态农业学报,2017,25(9):1254-1265,12.基金项目
国家高技术研究发展计划(863计划)项目(2013AA102904)和国家自然科学基金项目(41301305)资助 This study was supported by the National High Technology Research and Development Program of China (2013AA102904), the National Natural Science Foundation of China (41301305). （863计划）
