|生物炭施用下中国农田土壤N2O 排放的Meta 分析|
|罗晓琦1,2; 冯浩2,3; 刘晶晶1,2; 张阿凤2,4
为明确施加生物炭对中国农田土壤N2O 排放的影响和主要控制因素, 以公开发表的试验数据为研究
对象, 采用Meta-analysis 法定量分析了施加生物炭条件下, 气候、土壤性质、田间管理方式、生物炭性质与施
加量对土壤N2O 排放的影响, 并对各影响因素进行通径分析。结果表明, 当年降雨量≥600 mm 时, 生物炭显
著降低土壤N2O 排放量(P<0.05), 且随年降雨量的增加而增强; 当年日照时数大于1 000 h 时, 生物炭对土壤
N2O 的减排效果随年日照时数的增加而减弱。当土壤pH≥6.5 时, 生物炭对土壤N2O 的减排效果随土壤pH
的增加呈先增后减趋势; 在壤土中施加生物炭对N2O 的减排效果显著(P<0.05), 而砂土和黏土不显著
(P>0.05)。生物炭对覆膜土壤N2O 的减排效果优于不覆膜土壤; 生物炭对土壤N2O 的减排效果随施氮肥量增
加而减弱, 而随生物炭比表面积的增加而增强。当生物炭C/N 处于30~500 时, 生物炭施用下土壤N2O 排放量
显著降低(P<0.05); 当生物炭施加量处于20~160 thm2 时, 生物炭对土壤N2O 的减排效果随施加量增加而增
强。生物炭对土壤N2O 减排的影响存在显著的区域性特征, 对华南、华东、华中和东北地区影响显著(P<0.05),
因素, 这些因素的相互作用共同影响生物炭对土壤N2O 的减排效果。该研究可为生物炭在我国农区的推广应
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 ofbiochar 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 precipitation.
Also when annual mean sunshine hours was greater than 1 000 h, the N2O emission-reduction effect of biochar application
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 significantly
decreased soil N2O emissions in loam soils (P < 0.05), whereas the effects in sandy and clay soils were not significant
(P > 0.05). Moreover, the reduction in soil N2O emissions under film mulching was higher than that without film mulching.
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 30500, the effects of biochar application on soil N2O emissions
was significant at P < 0.05. When the amount of biochar was 20160 thm2, 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 effects
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
罗晓琦,冯浩,刘晶晶,等. 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.
罗晓琦,冯浩,刘晶晶,&张阿凤.(2017).生物炭施用下中国农田土壤N2O 排放的Meta 分析.中国生态农业学报,25(9),1254-1265.
罗晓琦,et al."生物炭施用下中国农田土壤N2O 排放的Meta 分析".中国生态农业学报 25.9(2017):1254-1265.
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