Crop Straws with Contrasting C/N Ratios Affect the Organic Carbon Turnover and Its Net Sequestration Efficiency When Solely or Jointly Incorporated to a Fertilized Soil

The quality (carbon to nitrogen ratio; C/N ratio) of crop residue affects the decomposition of soil organic carbon (SOC) due to the nutrient stoichiometry, which requires well-exploration especially on the dynamics and sequestration of SOC in nutrient-sufficient soil. We investigated an 80-day incub...

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Bibliographic Details
Published in:Journal of soil science and plant nutrition 2024-06, Vol.24 (2), p.2520-2533
Main Authors: Li, Xiushuang, Shi, Jianglan, Chen, Juan, Tian, Xiaohong
Format: Article
Language:English
Subjects:
Agriculture
Biomedical and Life Sciences
Carbon
Carbon dioxide
Carbon/nitrogen ratio
Corn
Crop residues
Crops
Decomposition
Ecology
Efficiency
Environment
Fertilization
Fertilizers
Hypotheses
Incubation
Isotopes
Legumes
Life Sciences
Lignin
Mineralization
Nitrogen
Nutrient dynamics
Organic carbon
Organic soils
Original Paper
Plant Sciences
Ratios
Signal to noise ratio
Soil fertility
Soil investigations
Soil microorganisms
Soil mixtures
Soil Science & Conservation
Soils
Stoichiometry
Straw
Wheat
Wheat straw
Winter wheat
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Summary:The quality (carbon to nitrogen ratio; C/N ratio) of crop residue affects the decomposition of soil organic carbon (SOC) due to the nutrient stoichiometry, which requires well-exploration especially on the dynamics and sequestration of SOC in nutrient-sufficient soil. We investigated an 80-day incubation experiment by adding C 3 winter wheat (W) and legume (L) straws (with contrasting C/N ratios) as well as their mixture (W + L) into a C 4 soil that had experienced years of maize planting and fertilization. Either W or L increased the decomposition rate (k a ) of SOC primarily in active pool and released more CO 2 over the short-term incubation. Compared with Ct, the W slightly decreased the k a , while the L increased the k a by 49.2% than Ct, and by 75.0% than W. The L increased the straw-derived SOC by 10.6% than W, while it resulted in a higher mineralization of native SOC, which was 2.04 times that of W. The W + L yielded the largest net gain in SOC at 1.35 g kg −1 , which followed by the W (0.66 g kg −1 ) and the L (0.22 g kg −1 ). Incorporating the lower C/N ratio’s legume straw more stimulated the decomposition of both active and native SOC even in fertilized soil, which could be the most effective at sequestrating SOC when combing with wheat straw. These findings suggest the difference in crop straw should be considered for SOC sequestration potential particularly in response to the increasingly intensified agriculture.
ISSN:0718-9508
0718-9516
DOI:10.1007/s42729-024-01672-6