Effects of CO2 fumigation and nitrogen addition on soil respiration in a wetland ecosystem: experimental approach with top open chambers

• Autorzy: Wang J. , Fu X. , Wang J. , Zhong H. , Zhang R. , Ni H.
• Języki publikacji: EN

Abstrakty

EN

Soil respiration plays a crucial role in global carbon cycling of terrestrial ecosystems. Changes in atmospheric CO₂ and nitrogen (N) addition across the globe are likely to affect soil respiration. However, the effects of elevated CO₂, and N addition on soil respiration are not fully understood especially in wetland ecosystems. To evaluate the effects of atmospheric CO₂ and N availability on soil respiration, a paired, nested manipulative in situ experiment was performed, using CO₂ fumigation within Open-Top Chambers as the primary factor, and N (as NH₄NO₃) as the secondary factor in a temperate wetland in northeastern China in 2010 and 2011. CO₂ fumigation significantly enhanced soil respiration, according to repeated-measures ANOVA, and the stimulatory effect of CO₂ fumigation on soil respiration was sustained during the whole experimental period regardless of N addition. However, the positive soil respiration effect of N addition alone weakened over time. Moreover, there was a significant interaction between CO₂ fumigation and N addition. Soil temperature explained 50–66% of the variation in soil respiration. Moreover, soil respiration was positively correlated with the root N content and litter decomposition rate. The results suggested that elevated CO₂ concentrations will accelerate soil respiration and ecosystem carbon cycling, thus, limiting soil carbon sequestration, especially when coupled with increasing N deposition.

Słowa kluczowe

EN

carbon dioxide; fumigation; nitrogen addition; soil respiration; wetland ecosystem; carbon sequestration

• Wydawca: -
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2018
• Tom: 66
• Numer: 2
• Opis fizyczny: p.102-113,fig.,ref.

Twórcy

autor

Wang J.

• Northeast Forestry University, Harbin, Heilongjiang, 150040, China
• Institute of Natural Resources and Ecology, Heilongjiang Academy of Sciences, Harbin, Heilongjiang, 150040, China
• National and Provincial Joint Engineering Laboratory of Wetlands and Ecological Conservation, Harbin, Heilongjiang, 150040, China
• Key Laboratory for Wetland and Restoration Ecology in Heilongjiang Province, Harbin, Heilongjiang, 150040, China

autor

Fu X.

• Institute of Natural Resources and Ecology, Heilongjiang Academy of Sciences, Harbin, Heilongjiang, 150040, China
• National and Provincial Joint Engineering Laboratory of Wetlands and Ecological Conservation, Harbin, Heilongjiang, 150040, China
• Key Laboratory for Wetland and Restoration Ecology in Heilongjiang Province, Harbin, Heilongjiang, 150040, China

autor

Wang J.

• Institute of Natural Resources and Ecology, Heilongjiang Academy of Sciences, Harbin, Heilongjiang, 150040, China
• National and Provincial Joint Engineering Laboratory of Wetlands and Ecological Conservation, Harbin, Heilongjiang, 150040, China
• Key Laboratory for Wetland and Restoration Ecology in Heilongjiang Province, Harbin, Heilongjiang, 150040, China

autor

Zhong H.

• Institute of Natural Resources and Ecology, Heilongjiang Academy of Sciences, Harbin, Heilongjiang, 150040, China
• National and Provincial Joint Engineering Laboratory of Wetlands and Ecological Conservation, Harbin, Heilongjiang, 150040, China
• Key Laboratory for Wetland and Restoration Ecology in Heilongjiang Province, Harbin, Heilongjiang, 150040, China

autor

Zhang R.

• Institute of Natural Resources and Ecology, Heilongjiang Academy of Sciences, Harbin, Heilongjiang, 150040, China
• National and Provincial Joint Engineering Laboratory of Wetlands and Ecological Conservation, Harbin, Heilongjiang, 150040, China
• Key Laboratory for Wetland and Restoration Ecology in Heilongjiang Province, Harbin, Heilongjiang, 150040, China

autor

Ni H.

• Institute of Natural Resources and Ecology, Heilongjiang Academy of Sciences, Harbin, Heilongjiang, 150040, China
• National and Provincial Joint Engineering Laboratory of Wetlands and Ecological Conservation, Harbin, Heilongjiang, 150040, China
• Key Laboratory for Wetland and Restoration Ecology in Heilongjiang Province, Harbin, Heilongjiang, 150040, China

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Identyfikatory

DOI

10.3161/15052249PJE2018.66.2.002