Response of soil carbon dioxide fluxes, soil organic carbon and microbial biomass carbon to biochar amendment: a meta-analysis

被引：323

作者：

Liu, Shuwei ^{[1
,2
]}

Zhang, Yaojun ^{[1
,2
]}

Zong, Yajie ^{[1
,2
]}

Hu, Zhiqiang ^{[1
,2
]}

Wu, Shuang ^{[1
,2
]}

Zhou, Jie ^{[1
,2
]}

Jin, Yaguo ^{[1
,2
]}

Zou, Jianwen ^{[1
,2
]}

机构：

[1] Nanjing Agr Univ, Jiangsu Key Lab Low Carbon Agr & GHGs Mitigat, Nanjing 210095, Jiangsu, Peoples R China

[2] Nanjing Agr Univ, Jiangsu Collaborat Innovat Ctr Solid Organ Waste, Nanjing 210095, Jiangsu, Peoples R China

来源：

GLOBAL CHANGE BIOLOGY BIOENERGY | 2016年 / 8卷 / 02期

基金：

中国国家自然科学基金;

关键词：

biochar; carbon dioxide; climate change; microbial biomass carbon; soil organic carbon; NITROUS-OXIDE EMISSIONS; GREENHOUSE-GAS EMISSIONS; SANDY LOAM SOIL; BLACK CARBON; FERTILIZER APPLICATION; CHEMICAL-PROPERTIES; CROPPING SYSTEMS; PADDY SOILS; CHARCOAL; DECOMPOSITION;

D O I：

10.1111/gcbb.12265

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Biochar as a carbon-rich coproduct of pyrolyzing biomass, its amendment has been advocated as a potential strategy to soil carbon (C) sequestration. Updated data derived from 50 papers with 395 paired observations were reviewed using meta-analysis procedures to examine responses of soil carbon dioxide (CO2) fluxes, soil organic C (SOC), and soil microbial biomass C (MBC) contents to biochar amendment. When averaged across all studies, biochar amendment had no significant effect on soil CO2 fluxes, but it significantly enhanced SOC content by 40% and MBC content by 18%. A positive response of soil CO2 fluxes to biochar amendment was found in rice paddies, laboratory incubation studies, soils without vegetation, and unfertilized soils. Biochar amendment significantly increased soil MBC content in field studies, N-fertilized soils, and soils with vegetation. Enhancement of SOC content following biochar amendment was the greatest in rice paddies among different land-use types. Responses of soil CO2 fluxes and MBC to biochar amendment varied with soil texture and pH. The use of biochar in combination with synthetic N fertilizer and waste compost fertilizer led to the greatest increases in soil CO2 fluxes and MBC content, respectively. Both soil CO2 fluxes and MBC responses to biochar amendment decreased with biochar application rate, pyrolysis temperature, or C/N ratio of biochar, while each increased SOC content enhancement. Among different biochar feedstock sources, positive responses of soil CO2 fluxes and MBC were the highest for manure and crop residue feedstock sources, respectively. Soil CO2 flux responses to biochar amendment decreased with pH of biochar, while biochars with pH of 8.1-9.0 had the greatest enhancement of SOC and MBC contents. Therefore, soil properties, land-use type, agricultural practice, and biochar characteristics should be taken into account to assess the practical potential of biochar for mitigating climate change.

引用

页码：392 / 406

页数：15

共 103 条

[1] Greenhouse gas emissions from a wastewater sludge-amended soil cultivated with wheat (Triticum spp. L.) as affected by different application rates of charcoal [J].