| Study on diurnal dynamic characteristic of soil respiration in oasis cotton field of arid area |
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| DOI：10.7606/j.issn.1000-7601.2011.05.28 |
| Key Words: arid area oasis cotton field soil respiration diurnal dynamic |
| Author Name | Affiliation | | CAO Xing | Urumqi Meteorological Administration, Urumqi 830000, China | | CHEN Rongyi | Institute of Desert Meteorology, CMA, Urumqi 830002, China | | CAI Xinting | Urumqi Meteorological Administration, Urumqi 830000, China | | WANG Simeng | Urumqi Meteorological Administration, Urumqi 830000, China | | JIANG Heng | Urumqi Meteorological Administration, Urumqi 830000, China |
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| Abstract: |
| By using the LI-8100 Automated Soil CO2 Flux System，we determined the diurnal dynamic characteristic of soil respiration in oasis cotton field. The results indicated that：The diurnal fluctuation of soil respiration is characterized by single-peaked curve, and the average rate of soil respiration of drip irrigation field, flood irrigation field and abandoned farml
and is 3.45, 3.37 μmol/(m2·s) and 1.63 μmol/(m2·s) respectively. In addition, the peak value of soil respiration occurrs at 15∶00～20∶00 (Beijing time), the valley value mainly occurrs at 4∶00～6∶00, there is a increasing tendency about the rate of soil respiration after 6∶00. The diurnal changes of soil respiration are similar in different weathers, and the average daily value in fine day is higher than that in cloudy day, which is also higher in day than that at night. The rate of soil respiration changes fiercely during the day and falls slowly during the night. The average values of soil respiration rate during the day and night in cotton field are higher than those in abandoned farmland. |
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