| Characteristics of diurnal variation of soil respiration and its relationship with soil temperature of cotton fields in arid irrigated regions |
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| DOI：10.7606/j.issn.1000-7601.2012.03.21 |
| Key Words: soil respiration rhizosphere respiration soil microbial respiration soil temperature irrigated cotton field arid area |
| Author Name | Affiliation | | LAI Dongmei | Xinjiang lnstiruae of Ecology and Geography, Chinese Acodemy of Sciences, Urumqi 830011, China
State Key Laboratory of Desert and Oasis Ecology, Urumqi 830011, China
Graduate University of Chinese Academy of Sciences, Beijing 100049, China | | LIZhiguo | Wuhan Botanical Garden
Chinese Academy of Sciences,
Wuhan 430074, China | | TIAN Changyan | Xinjiang lnstiruae of Ecology and Geography, Chinese Acodemy of Sciences, Urumqi 830011, China
State Key Laboratory of Desert and Oasis Ecology, Urumqi 830011, China | | HUANG Wei | College of Plan Seience， Tarim Uniuersity, Alar, Xinjiang
843300, China | | WANG Huaijun | College of Plan Seience， Tarim Uniuersity, Alar, Xinjiang
843300, China | | SONG Weil | College of Plan Seience， Tarim Uniuersity, Alar, Xinjiang
843300, China |
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| Abstract: |
| With bare land as CK, a field experiment was conducted to investigate the characteristics of diurnal vari-ation of soil respiration and its relationship with soil temperature of cotton fields in arid irrigated regions by monitoring CO2 content of soil profile. The results indicated that(1)Soil and rhizosphere respiration showed a “V”-type feature of diurnal variation, the minimum value occurred between 16:00~17:00, while the trend of soil microbial respiration was opposite; (2)Soil microbial respiration at the period of soil temperature increasing was higher than that at the period of soil temperatures
decreasing. However, rhizosphere respiration displayed an opposite result which formed an obvious counterclockwise hysteresis loop; (3)The contribution percentage of rhizosphere respiration to soil respiration was 47%. The results suggested that differentiating between rhizosphere respiration and soil microbial respiration was a very impor-tant step to establish the model of soil respiration and soil temperature corrclation, and the differences of the impaots of soil temperature on soil respiration should be considered. |
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