DOI: 10.1016/j.soilbio.2020.107735
论文题名: A meta-analysis of global cropland soil carbon changes due to cover cropping
作者: Jian J. ; Du X. ; Reiter M.S. ; Stewart R.D.
刊名: Soil Biology and Biochemistry
ISSN: 380717
出版年: 2020
卷: 143 语种: 英语
英文关键词: Cover crop
; Database
; Meta-analysis
; Soil health
; Soil organic carbon
; Soil quality
Scopus关键词: Climatology
; Crops
; Database systems
; Forestry
; Fossil fuels
; Magnesium
; Nitrogen
; Organic carbon
; Quality control
; Regression analysis
; Textures
; Cover crops
; Meta analysis
; Soil health
; Soil organic carbon
; Soil quality
; Soils
; agricultural production
; agricultural soil
; biomass
; concentration (composition)
; confidence interval
; cover crop
; database
; experimental study
; global change
; meta-analysis
; soil carbon
; soil nitrogen
; soil quality
英文摘要: Including cover crops within agricultural rotations may increase soil organic carbon (SOC). However, contradictory findings generated by on-site experiments make it necessary to perform a comprehensive assessment of interactions between cover crops, environmental and management factors, and changes in SOC. In this study, we collected data from studies that compared agricultural production with and without cover crops, and then analyzed those data using meta-analysis and regression. Our results showed that including cover crops into rotations significantly increased SOC, with an overall mean change of 15.5% (95% confidence interval of 13.8%–17.3%). Whereas medium-textured soils had highest SOC stocks (overall means of 39 Mg ha−1 with and 37 Mg ha−1 without cover crops), fine-textured soils showed the greatest increase in SOC after the inclusion of cover crops (mean change of 39.5%). Coarse-textured (11.4%) and medium-textured soils (10.3%) had comparatively smaller changes in SOC, while soils in temperate climates had greater changes (18.7%) than those in tropical climates (7.2%). Cover crop mixtures resulted in greater increases in SOC compared to mono-species cover crops, and using legumes caused greater SOC increases than grass species. Cover crop biomass positively affected SOC changes while carbon:nitrogen ratio of cover crop biomass was negatively correlated with SOC changes. Cover cropping was associated with significant SOC increases in shallow soils (≤30 cm), but not in subsurface soils (>30 cm). The regression analysis revealed that SOC changes from cover cropping correlated with improvements in soil quality, specifically decreased runoff and erosion and increased mineralizable carbon, mineralizable nitrogen, and soil nitrogen. Soil carbon change was also affected by annual temperature, number of years after start of cover crop usage, latitude, and initial SOC concentrations. Finally, the mean rate of carbon sequestration from cover cropping across all studies was 0.56 Mg ha−1 yr−1. If 15% of current global cropland were to adopt cover crops, this value would translate to 0.16 ± 0.06 Pg of carbon sequestered per year, which is ~1–2% of current fossil fuels emissions. Altogether, these results indicated that the inclusion of cover crops into agricultural rotations can enhance soil carbon concentrations, improve many soil quality parameters, and serve as a potential sink for atmosphere CO2. © 2020 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158432
Appears in Collections: 气候变化与战略
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作者单位: School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA, United States; Pacific Northwest National Laboratory-University of Maryland Joint Global Change Research Institute, 5825 University Research Court, Suite, College ParkMD 3500, United States; Department of Hydraulic Engineering, Yangling Vocational & Technical College, Yang Ling, Shaanxi, China; Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA, United States
Recommended Citation:
Jian J.,Du X.,Reiter M.S.,et al. A meta-analysis of global cropland soil carbon changes due to cover cropping[J]. Soil Biology and Biochemistry,2020-01-01,143