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| Diurnal Variation of Soil Respiration in a Typical Plant Community in the Ebinur Lake Wetland During Beginning Winter |
| Received:May 10, 2015 |
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| KeyWord:soil respiration;wetland;Ebinur Lake;soil temperature;soil water content;beginning of winter |
| Author Name | Affiliation | E-mail | | ZHAO Ming-liang | Collegel of Geographic Science and Tourism, Xinjiang Normal University, Urumqi 830054, China
Key Laboratory of Xinjiang Uygur Autonomous Region, Xinjiang Laboratory of Lake Environment and Resources in Arid Area, Urumqi 830054, China | | | LI Yan-hong | Collegel of Geographic Science and Tourism, Xinjiang Normal University, Urumqi 830054, China
Key Laboratory of Xinjiang Uygur Autonomous Region, Xinjiang Laboratory of Lake Environment and Resources in Arid Area, Urumqi 830054, China | lyh0704@126.com | | LI Fa-dong | Collegel of Geographic Science and Tourism, Xinjiang Normal University, Urumqi 830054, China
Key Laboratory of Xinjiang Uygur Autonomous Region, Xinjiang Laboratory of Lake Environment and Resources in Arid Area, Urumqi 830054, China
Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | |
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| Abstract: |
| Soil respiration from the surrounding wetland of a lake is a vital component of soil carbon cycle for inland water ecosystems. To date, however, there have been fewer studies on the soil respiration around high salt lakes during beginning of cold winter because of difficulties in field observations. In this study, two intensive field measurements were conducted at a wetland by the Ebinur Lake(82°36'~82°50'E, 44°30'~45°09'N), located at the Xinjiang Uygur Autonomous Region in the Western China, in the early winter of 2014. A soil carbon flux automatic analyzer(LI-840A) was used to measure soil respiration in two typical plant communities, reed(Phragmites australis) and tamarisk(Tamarix ramosissima), in an interval of 2 hours for two whole days. At the same time, soil moisture, soil temperature, air humidity, and air temperature were also observed to understand the controlling factors of soil respiration of local ecosystem. Results showed that the peak of soil respiration occurred at 11:00 and 13:00 for tamarisk and reed, respectively, but the minimum value observed at 6:00 for both plants. The daily average of soil respiration rate was lower for the reed community(0.162 μmol·m-2·s-1) than for the tamarisk community(0.364 μmol·m-2·s-1). However, the soil respiration rate for the reed was greater than that for the tamarisk between 13:00-17:00. Negative soil respiration rates were observed for reed between 22:00-10:00 and for tamarisk between 4:00-9:00, implying carbon sinks during these specific periods. Soil respiration rate was significantly linearly correlated with soil temperature at 5 cm depth and air temperature at 5 cm above ground for both reed and tamarisk. The Q10 values for soil and air temperature were 2.69 and 1.89 for reed and 2.04 and 1.64 for tamarisk, respectively, suggesting that the soil respiration for the reed community had a stronger response to soil temperature change than that for the tamarisk community by the Ebinur Lake in the early winter. Soil respiration rate had no linear correlation with soil water content at 5 cm for reed and tamarisk. |
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