The Contribution of Soil Respiration to Ecosystem Respiration of Haloxylon ammodendron Community in the South of Gurbantunggut Desert

Yang Jie; Liu Ran; Ma Jie; Tang Lisong; Li Yan

doi:10.7522/j.issn.1000-694X.2015.00037

2016 , Vol. 36 >Issue 3: 726 - 733

DOI: https://doi.org/10.7522/j.issn.1000-694X.2015.00037

The Contribution of Soil Respiration to Ecosystem Respiration of Haloxylon ammodendron Community in the South of Gurbantunggut Desert

Yang Jie ,
Liu Ran ,
Ma Jie ,
Tang Lisong ,
Li Yan

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1. State Key Laboratory of Desert and Oasis Ecology/Fukang Station of Desert Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2015-01-08

Revised date: 2015-03-04

Online published: 2016-05-20

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Abstract

Soil respiration (R_soil) typically performs as the main contributors to the annual total ecosystem respiration (R_eco) in ecosystem, but the seasonal variation of the R_soil/R_eco has not been investigated. The objective of this study was to investigate the characteristics of soil respiration and ecosystem respiration in a Haloxylon ammodendron community, located in the southern margin of Gurbantunggut Desert in western China. Special attention was paid on the seasonal variation of the R_soil/R_eco. The results showed that: (1) The R_eco was unimodal distribution during the whole growing season, the maximum R_eco was 0.75 g·m^-2·d^-1 and the minimum was 0.09 g·m^-2·d^-1. The R_soil was little changed during May to July (0.34-0.51 g·m^-2·d^-1), and began decreasing since the end of July. (2) The R_soil/R_eco ranged from 0.38 to 0.98, with an average of 0.67 across the whole growing season. On a seasonal basis, R_soil/R_eco presented an obvious "U" pattern: the value of R_soil/R_eco was 0.71 at the beginning of growing season; in the middle of growing season, the value of R_soil/R_eco reduced (about 0.43) as the plants into rapid growth period because of plants senesced; at the end of growing season, the R_soil/R_eco increased. (3) There was a significant linear correlation between the R_soil/R_eco and biomass of H.ammodendron assimilating twigs (R²=0.458, P<0.05), indicated that as the H.ammodendron growth, the contribution of H.ammodendron aboveground respiration (especially with leaf respiration) to R_eco also increased.

Key words： soil respiration; ecosystem respiration; carbon dioxide flux; eddy covariance

Cite this article

Yang Jie , Liu Ran , Ma Jie , Tang Lisong , Li Yan . The Contribution of Soil Respiration to Ecosystem Respiration of Haloxylon ammodendron Community in the South of Gurbantunggut Desert[J]. Journal of Desert Research, 2016 , 36(3) : 726 -733 . DOI: 10.7522/j.issn.1000-694X.2015.00037

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