Respiration Characteristics of Different Sized Soil Aggregates and Their Contribution to Carbon Emissions

WANG Jing; CHEN Fang; LIU Yi

doi:10.11913/PSJ.2095-0837.2014.60586

Plant Science Journal > 2014 > 32(6): 586-593. > DOI: 10.11913/PSJ.2095-0837.2014.60586 CSTR: 32231.14.PSJ.2095-0837.2014.60586

WANG Jing, CHEN Fang, LIU Yi. Respiration Characteristics of Different Sized Soil Aggregates and Their Contribution to Carbon Emissions[J]. Plant Science Journal, 2014, 32(6): 586-593. DOI: 10.11913/PSJ.2095-0837.2014.60586

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Respiration Characteristics of Different Sized Soil Aggregates and Their Contribution to Carbon Emissions

WANG Jing^1,3,
CHEN Fang¹,
LIU Yi^1,2, ,

1. Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China;
2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Water and Soil Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China

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Received Date: April 22, 2014
Available Online: October 31, 2022
Published Date: December 29, 2014

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Abstract

Abstract

The respiration characteristics of different sized yellow brown soil aggregates and their contribution to carbon emissions were assessed by soil pot experiment. Results showed that the respiration rates of aggregates and homogenized soil were highest at the beginning of the incubation, and then showed a descending tendency during the period of incubation. During the incubation time, the homogenized soil had the highest respiration rate. The respiration rates varied with aggregate size: (>5 mm)>(<1 mm)≈(1~5 mm). This indicated that the largest macroaggregates (>5 mm) had the highest contribution to carbon emissions. Correlation analysis showed that the respiration rates of different sized soil aggregates were significantly and exponentially correlated with soil temperature. The Q₁₀ values ranged from 2.53 to 5.11 and had the same variation tendency in different aggregates with soil organic carbon (SOC) and total nitrogen (TN). The <1 mm aggregates had the highest Q₁₀ value and SOC and TN contents, while>5mm and 1~5 mm aggregates had lower Q₁₀ values and SOC and TN contents. Our results suggested that both the contents of SOC and TN and the soil structure affected temperature sensitivity of soil respiration.
- Soil aggregate,
- Soil respiration,
- Carbon emission,
- Temperature sensitivity (Q₁₀)

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References

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