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| Diurnal dynamics of soil respiration and the influencing factors for three land-cover types in the hinterland of the Taklimakan Desert, China |
Fan YANG1,2,*( ), Mamtimin ALI1,2, Xinqian ZHENG3, Qing HE1,2, Xinghua YANG1,2, Wen HUO1,2, Fengchao LIANG4, Shaoming WANG5 |
1 Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China
2 Taklimakan Desert Atmosphere and Environment Observation Experiment Station, Tazhong 841000, China
3 Xinjiang Agro-Meteorological Observatory, Urumqi 830002, China
4 Xinjiang Climate Center, Urumqi 830002, China
5 Forestry Bureau of Bailongjiang, Lanzhou 730050, China |
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Abstract Knowledge of soil respiration and the influencing factors in desert ecosystems is essential to understanding carbon dynamics and responses of biotic and abiotic processes in soils to climate change. In this study, soil respiration rate (Rs) for three land-cover types (shifting sandy land, sandy land with straw checkerboard barriers, and shelter forest land) in the hinterland of the Taklimakan Desert was measured in May 2015 using an automated soil CO2 flux system. The effects of soil temperature (Ts) and soil water content (Ws) on Rs were also analyzed. The results showed that Rs values in shifting sandy land, sandy land with straw checkerboard barriers, and shelter forest land were all low and exhibited obvious diurnal fluctuations. The establishment of straw checkerboard barriers in sandy land had no significant effect on Rs, while the establishment of shelterbelts significantly increased Rs. Shifting sandy land and sandy land with straw checkerboard barriers were carbon sinks at night and early morning and were carbon sources in the daytime, while shelter forest land always acted as a carbon source during the whole day. The synergistic effect of Ts and Ws could better explain the diurnal dynamics in Rs than single factor. In shifting sandy land and sandy land with straw checkerboard barriers, Ws was identified as a limiting factor influencing the diurnal dynamics of Rs. Furthermore, a relatively strong hysteresis loop existed between Rs and Ts. In contrast, in shelter forest land, Rs was significantly influenced by Ts, and a relatively weaker hysteresis loop existed between Rs and Ws.
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Received: 15 June 2016
Published: 10 August 2017
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Corresponding Authors:
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| Cite this article:
Fan YANG, Mamtimin ALI, Xinqian ZHENG, Qing HE, Xinghua YANG, Wen HUO, Fengchao LIANG, Shaoming WANG. Diurnal dynamics of soil respiration and the influencing factors for three land-cover types in the hinterland of the Taklimakan Desert, China. Journal of Arid Land, 2017, 9(4): 568-579.
URL:
http://jal.xjegi.com/10.1007/s40333-017-0060-0 OR http://jal.xjegi.com/Y2017/V9/I4/568
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