Diurnal Changes of Soil Respiration of Populus euphratica Forest in Ejina

doi:10.7668/hbnxb.2016.S1.063

Abstract

Abstract: In order to promote the studies estimating soil CO₂ efflux in Ejina and investigate the response of soil respiration to environmental factors,soil respiration rate daily variations of populus euphratica forest was investigated in September(growing season) and November(dormant season) of 2015,in addition,daily soil CO₂ emissions were calculated using observed and estimated values based on measurements of soil respiration and environmental factors. The results showed that the observed average daily soil CO₂ emissions in September and November(171.18,37.27 mmol/m²) were slightly higher than the estimated values(168.91,37.16 mmol/m²). The daily mean soil CO₂ efflux in November(0.94 μmol/(m²·s)) was 22% of that in September(4.32 μmol/(m²·s)). Q₁₀ values for Populus euphratica forest in September and November were 1.61 and 1.99,respectively. Soil organic matter content,soil total nitrogen content and C/N ratio were correlated with the amount of soil CO₂ emission in positive trends. Application of a two-variable interactive function suggested a better representation of the dependence of soil CO₂ efflux on soil temperature and soil water content than single factor functions using either soil temperature or soil water content. It is inferred that Populus euphratica forest would be adaptive to climate change when assessing variation in carbon budget and responses to climate change combining precipitation change and global warming.

Key words: Soil respiration, Ejina, Populus euphratica forest

CLC Number:

S714

JIN Hua, SU Yonghong, MA Xiaohong, HAN Tuo, MA Zhenyong. Diurnal Changes of Soil Respiration of Populus euphratica Forest in Ejina[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2016, 31(S1): 375-380. doi: 10.7668/hbnxb.2016.S1.063.

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