DOI: 10.1111/gcb.12274
论文题名: Soil nitrous oxide emissions following crop residue addition: A meta-analysis
作者: Chen H. ; Li X. ; Hu F. ; Shi W.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 10 起始页码: 2956
结束页码: 2964
语种: 英语
英文关键词: Arable soil
; C : N ratio
; Crop residue
; Meta-analysis
; Nitrous oxide
; Soil CO2 respiration
; Soil pH
; Soil texture
; Water-filled pore space
Scopus关键词: anoxic conditions
; carbon dioxide
; carbon sequestration
; crop residue
; meta-analysis
; nitrous oxide
; pH
; pore space
; soil carbon
; soil emission
; soil respiration
; soil texture
; soil water
; carbon
; fertilizer
; nitrogen
; nitrous oxide
; air pollutant
; arable soil
; article
; chemistry
; crop
; C : N ratio
; meta analysis
; plant residue
; soil
; soil acidity
; soil CO2 respiration
; soil texture
; water-filled pore space
; arable soil
; crop residue
; C : N ratio
; meta-analysis
; nitrous oxide
; soil CO2 respiration
; soil pH
; soil texture
; water-filled pore space
; Air Pollutants
; Carbon
; Crops, Agricultural
; Fertilizers
; Nitrogen
; Nitrous Oxide
; Soil
英文摘要: Annual production of crop residues has reached nearly 4 billion metric tons globally. Retention of this large amount of residues on agricultural land can be beneficial to soil C sequestration. Such potential impacts, however, may be offset if residue retention substantially increases soil emissions of N2O, a potent greenhouse gas and ozone depletion substance. Residue effects on soil N2O emissions have gained considerable attention since early 1990s; yet, it is still a great challenge to predict the magnitude and direction of soil N2O emissions following residue amendment. Here, we used a meta-analysis to assess residue impacts on soil N2O emissions in relation to soil and residue attributes, i.e., soil pH, soil texture, soil water content, residue C and N input, and residue C : N ratio. Residue effects were negatively associated with C : N ratios, but generally residue amendment could not reduce soil N2O emissions, even for C : N ratios well above ca. 30, the threshold for net N immobilization. Residue effects were also comparable to, if not greater than, those of synthetic N fertilizers. In addition, residue effects on soil N2O emissions were positively related to the amounts of residue C input as well as residue effects on soil CO2 respiration. Furthermore, most significant and stimulatory effects occurred at 60-90% soil water-filled pore space and soil pH 7.1-7.8. Stimulatory effects were also present for all soil textures except sand or clay content ≤10%. However, inhibitory effects were found for soils with >90% water-filled pore space. Altogether, our meta-analysis suggests that crop residues played roles beyond N supply for N2O production. Perhaps, by stimulating microbial respiration, crop residues enhanced oxygen depletion and therefore promoted anaerobic conditions for denitrification and N2O production. Our meta-analysis highlights the necessity to connect the quantity and quality of crop residues with soil properties for predicting soil N2O emissions. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62337
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Soil Science, North Carolina State University, Raleigh, NC, 27695, United States; Laboratory of Soil Ecology, College of Resources and Environmental Sciences, Nanjing Agricultural University, Jiangsu, 210095, China; Wujiang Environmental Protection Bureau, Suzhou, Jiangsu, 215200, China
Recommended Citation:
Chen H.,Li X.,Hu F.,et al. Soil nitrous oxide emissions following crop residue addition: A meta-analysis[J]. Global Change Biology,2013-01-01,19(10)