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

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

JOURNAL OF DESERT RESEARCH ›› 2016, Vol. 36 ›› Issue (3): 726-733.DOI: 10.7522/j.issn.1000-694X.2015.00037

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

Yang Jie^1,2, Liu Ran¹, Ma Jie¹, Tang Lisong¹, Li Yan¹

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:2015-01-08 Revised:2015-03-04 Online:2016-05-20 Published:2016-05-20

Abstract

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

CLC Number:

S154.1

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.

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

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