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Han, Xiaoyang
- Soil Respiration and its Relationship to Environmental Factors in Three Land Uses on the Loess Tableland
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Authors
Affiliations
1 State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources/Northwest A&F University, Yangling, Shaanxi, 712100, CN
2 École de technologie supérieure, Université du Québec, 1100, rue Notre-Dame Ouest, Montreal, QC., H3C 1K3, CA
1 State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources/Northwest A&F University, Yangling, Shaanxi, 712100, CN
2 École de technologie supérieure, Université du Québec, 1100, rue Notre-Dame Ouest, Montreal, QC., H3C 1K3, CA
Source
Nature Environment and Pollution Technology, Vol 15, No 3 (2016), Pagination: 923-928Abstract
Investigating the contribution of different land use types to the carbon cycle of terrestrial ecosystems is of considerable importance in studying global climate change. The objective of this study is to determine the temporal variation of soil respiration rates in different land uses (maize, wheat stubble, and bare land) and their responses to environmental factors for the Loess Tableland, using an improved multi-channel automatic flux chamber system. Results showed that the soil respiration rate indicates a clear diurnal and seasonal variations. The mean soil carbon emission rates were 0.94, 1.94 and 2.38 gC·m-2·d-1 in bare land, wheat stubble field, and maize field, respectively. The determination coefficient of soil surface temperature on the diurnal soil respiration rate was more significant than that of deeper layers. The Q10 value was used to represent the temperature sensitivity of soil respiration in three different land uses, soil respiration in the maize field showed the largest temperature sensitivity. The soil respiration was found to increase exponentially with the increase in air temperature, whereas the relationship between soil respiration and soil moisture was quadratic. The trend of rainfall-affected soil respiration after the sudden rain and continuous light rain showed large differences, meanwhile, a clear difference in the sensitivity of soil respiration to rainfall exists for the different land uses.Keywords
Environmental Factors, Loess Tableland, Soil Respiration, Soil Temperature, Soil Moisture, Climate Change.Full Text
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