Diurnal and Seasonal Dynamics of Soil Respiration at Temperate <em>Leymus Chinensis</em> Meadow Steppes in Western Songnen Plain, China

WANG Ming; LIU Xingtu; ZHANG Jitao; LI Xiujun; WANG Guodong; LI Xiaoyu; LU Xinrui

doi:10.1007/s11769-014-0682-5

Diurnal and Seasonal Dynamics of Soil Respiration at Temperate Leymus Chinensis Meadow Steppes in Western Songnen Plain, China

doi: 10.1007/s11769-014-0682-5

1.
Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;
2.
University of Chinese Academy of Sciences, Beijing 100049, China

基金项目: Under the auspices of Special Fund for Agro-scientific Research in Public Interest, China (No. 201303095-8), National Natural Science Foundation of China (No. 31100403, 41101207), National Basic Research Program of China (No. 2013CB430401), Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences

详细信息

通讯作者:
LI Xiujun. E-mail: lixiujun@neigae.ac.cn

Diurnal and Seasonal Dynamics of Soil Respiration at Temperate Leymus Chinensis Meadow Steppes in Western Songnen Plain, China

1.
Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds: Under the auspices of Special Fund for Agro-scientific Research in Public Interest, China (No. 201303095-8), National Natural Science Foundation of China (No. 31100403, 41101207), National Basic Research Program of China (No. 2013CB430401), Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences

More Information

Corresponding author: LI Xiujun. E-mail: lixiujun@neigae.ac.cn

摘要: To evaluate the diurnal and seasonal variations in soil respiration (Rs) and understand the controlling factors, we measured carbon dioxide (CO₂) fluxes and their environmental variables using a LI-6400 soil CO₂ flux system at a temperate Leymus chinensis meadow steppe in the western Songnen Plain of China in the growing season (May-October) in 2011 and 2012. The diurnal patterns of soil respiration could be expressed as single peak curves, reaching to the maximum at 11:00-15:00 and falling to the minimum at 21:00-23:00 (or before dawn). The time-window between 7:00 and 9:00 could be used as the optimal measuring time to represent the daily mean soil CO₂ efflux. In the growing season, the daily value of soil CO₂ efflux was moderate in late spring (1.06-2.51 μmol/(m²·s) in May), increased sharply and presented a peak in summer (2.95-3.94 μmol/(m²·s) in July), and then decreased in autumn (0.74-0.97 μmol/(m²·s) in October). Soil temperature (Ts) exerted dominant control on the diurnal and seasonal variations of soil respiration. The temperature sensitivity of soil respiration (Q₁₀) exhibited a large seasonal variation, ranging from 1.35 to 3.32, and decreased with an increasing soil temperature. Rs gradually increased with increasing soil water content (Ws) and tended to decrease when Ws exceeded the optimum water content (27%) of Rs. The Ts and Ws had a confounding effect on Rs, and the two-variable equations could account for 72% of the variation in soil respiration (p < 0.01).
- soil respiration /
- Leymus chinensis /
- temperature sensitivity of soil respiration (Q₁₀) /
- soil temperature /
- soil water content
Abstract: To evaluate the diurnal and seasonal variations in soil respiration (Rs) and understand the controlling factors, we measured carbon dioxide (CO₂) fluxes and their environmental variables using a LI-6400 soil CO₂ flux system at a temperate Leymus chinensis meadow steppe in the western Songnen Plain of China in the growing season (May-October) in 2011 and 2012. The diurnal patterns of soil respiration could be expressed as single peak curves, reaching to the maximum at 11:00-15:00 and falling to the minimum at 21:00-23:00 (or before dawn). The time-window between 7:00 and 9:00 could be used as the optimal measuring time to represent the daily mean soil CO₂ efflux. In the growing season, the daily value of soil CO₂ efflux was moderate in late spring (1.06-2.51 μmol/(m²·s) in May), increased sharply and presented a peak in summer (2.95-3.94 μmol/(m²·s) in July), and then decreased in autumn (0.74-0.97 μmol/(m²·s) in October). Soil temperature (Ts) exerted dominant control on the diurnal and seasonal variations of soil respiration. The temperature sensitivity of soil respiration (Q₁₀) exhibited a large seasonal variation, ranging from 1.35 to 3.32, and decreased with an increasing soil temperature. Rs gradually increased with increasing soil water content (Ws) and tended to decrease when Ws exceeded the optimum water content (27%) of Rs. The Ts and Ws had a confounding effect on Rs, and the two-variable equations could account for 72% of the variation in soil respiration (p < 0.01).
- soil respiration /
- Leymus chinensis /
- temperature sensitivity of soil respiration (Q₁₀) /
- soil temperature /
- soil water content

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Diurnal and Seasonal Dynamics of Soil Respiration at Temperate Leymus Chinensis Meadow Steppes in Western Songnen Plain, China

doi: 10.1007/s11769-014-0682-5

通讯作者:
LI Xiujun. E-mail: lixiujun@neigae.ac.cn

Diurnal and Seasonal Dynamics of Soil Respiration at Temperate Leymus Chinensis Meadow Steppes in Western Songnen Plain, China

Corresponding author: LI Xiujun. E-mail: lixiujun@neigae.ac.cn

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Diurnal and Seasonal Dynamics of Soil Respiration at Temperate Leymus Chinensis Meadow Steppes in Western Songnen Plain, China

doi: 10.1007/s11769-014-0682-5

1. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;

2. University of Chinese Academy of Sciences, Beijing 100049, China

通讯作者: LI Xiujun. E-mail: lixiujun@neigae.ac.cn

English Abstract

Diurnal and Seasonal Dynamics of Soil Respiration at Temperate Leymus Chinensis Meadow Steppes in Western Songnen Plain, China

1. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;

2. University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: LI Xiujun. E-mail: lixiujun@neigae.ac.cn

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Diurnal and Seasonal Dynamics of Soil Respiration at Temperate Leymus Chinensis Meadow Steppes in Western Songnen Plain, China

doi: 10.1007/s11769-014-0682-5

通讯作者: LI Xiujun. E-mail: lixiujun@neigae.ac.cn

Diurnal and Seasonal Dynamics of Soil Respiration at Temperate Leymus Chinensis Meadow Steppes in Western Songnen Plain, China

Corresponding author: LI Xiujun. E-mail: lixiujun@neigae.ac.cn

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Diurnal and Seasonal Dynamics of Soil Respiration at Temperate Leymus Chinensis Meadow Steppes in Western Songnen Plain, China

doi: 10.1007/s11769-014-0682-5

1. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China

通讯作者: LI Xiujun. E-mail: lixiujun@neigae.ac.cn

English Abstract

Diurnal and Seasonal Dynamics of Soil Respiration at Temperate Leymus Chinensis Meadow Steppes in Western Songnen Plain, China

1. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: LI Xiujun. E-mail: lixiujun@neigae.ac.cn

全文HTML

目录

通讯作者:
LI Xiujun. E-mail: lixiujun@neigae.ac.cn

1. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;

2. University of Chinese Academy of Sciences, Beijing 100049, China

1. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;

2. University of Chinese Academy of Sciences, Beijing 100049, China