Contribution of root respiration to soil respiration in a C3/C4 mixed grassland

Journal of biosciences

Wei Wang1 2¹  Kenji Ohse²  Wenhong Mo²  Jianjun Liu³  Takehisa Oikawa² 

[1] School of Urban and Environmental Sciences, Northeast Normal University, Jilin, Changchun 130024, People’s Republic of China$$;Institute of Biological Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan$$;Northwest Scientific University of Agriculture and Forestry, Yangling 712100, People’s Republic of China$$

关键词: C3/C4 mixed grassland;    microbial respiration;    root biomass;    root respiration;    soil respiration.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

The spatial and temporal variations of soil respiration were studied from May 2004 to June 2005 in a C3/C4 mixed grassland of Japan. The linear regression relationship between soil respiration and root biomass was used to determine the contribution of root respiration to soil respiration. The highest soil respiration rate of 11.54 𝜇mol m–2 s–1 was found in August 2004 and the lowest soil respiration rate of 4.99 𝜇mol m–2 s–1 was found in April 2005. Within-site variation was smaller than seasonal change in soil respiration. Root biomass varied from 0.71 kg m–2 in August 2004 to 1.02 in May 2005. Within-site variation in root biomass was larger than seasonal variation. Root respiration rate was highest in August 2004 (5.7 𝜇mol m–2 s–1) and lowest in October 2004 (1.7 𝜇mol m–2 s–1). Microbial respiration rate was highest in August 2004 (5.8 𝜇mol m–2 s–1) and lowest in April 2005 (2.59 𝜇mol m–2 s–1). We estimated that the contribution of root respiration to soil respiration ranged from 31% in October to 51% in August of 2004, and from 45% to 49% from April to June 2005.

【 授权许可】

Unknown