Diurnal and seasonal dynamics of soil respiration at temperate Leymus chinensis meadow steppes in western Songnen Plain, China
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- 作者：Ming Wang (1) (2)
Xingtu Liu (1)
Jitao Zhang (1)
Xiujun Li (1)
Guodong Wang (1) (2)
Xiaoyu Li (1)
Xinrui Lu (1) - 关键词：soil respiration ; Leymus chinensis ; temperature sensitivity of soil respiration (Q 10) ; soil temperature ; soil water content
- 刊名：Chinese Geographical Science
- 出版年：2014
- 出版时间：June 2014
- 年：2014
- 卷：24
- 期：3
- 页码：287-296
- 全文大小：
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Xingtu Liu (1)
Jitao Zhang (1)
Xiujun Li (1)
Guodong Wang (1) (2)
Xiaoyu Li (1)
Xinrui Lu (1)
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 - ISSN：1993-064X
文摘
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 11:00-5:00 and falling to the minimum at 21:00-3:00 (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-.51 μmol/(m2·s) in May), increased sharply and presented a peak in summer (2.95-.94 μmol/(m2·s) in July), and then decreased in autumn (0.74-.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 (Q 10) 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).