| Diurnal variation characteristics of groundwater evaporation with different underlying surfaces in Korla |
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| DOI：10.7606/j.issn.1000-7601.2013.03.13 |
| Key Words: groundwater evaporation diurnal variation characteristic underlying surface open hole ratio cotton |
| Author Name | Affiliation | | XING Xuguang | Key Laboratory for Northuest Water Resources and Ecological Environment of Ministry of Education, Xi’an University of Technology,Xi’an, Shaanxi 710048, China | | SHI Wenjuan | Key Laboratory for Northuest Water Resources and Ecological Environment of Ministry of Education, Xi’an University of Technology,Xi’an, Shaanxi 710048, China | | XU Fei | Key Laboratory for Northuest Water Resources and Ecological Environment of Ministry of Education, Xi’an University of Technology,Xi’an, Shaanxi 710048, China | | WANG Quanjiu | Key Laboratory for Northuest Water Resources and Ecological Environment of Ministry of Education, Xi’an University of Technology,Xi’an, Shaanxi 710048, China
State Key Laboraiory of Soil Erosion and Dry-land Farming on the Loess Plateau, lnstitute of Soil and Water Conservation,
Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | ZHAO Xun | Key Laboratory for Northuest Water Resources and Ecological Environment of Ministry of Education, Xi’an University of Technology,Xi’an, Shaanxi 710048, China |
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| Abstract: |
| In attempt to study diurnal variation characteristics of groundwater evaporation with different underlying
surfaces in Korla area, three kinds of underlying surfaces, bare soil(buried depths are 1.0 m, 1.5 m and 2.0 m), film mulching without crop(open hole ratios are 0.78%, 2.4% and 5.0%)and cotton(buried depths are 1.0 m,1.5 m and 2.0 m), were tested in this paper. The results showed that groundwater evaporation coefficient with crop was higher than that without crop, and differenee between them decreased gradually with increase of buried depth. All the test results indicated that groundwater evaporation was higher in nighttime than in daytime. The ratio of bare soil groundwater consumption between nighttime and daytime was reduced, but ratio for cotton was increased with increase of groundwater depth, which may have nothing to do with difference of diural variations of cotton transpiration intensity. Further study showed that without crop planted, diurnal variations range of groundwater evaporation was bigger, and major groundwater consumption periods were 8:00~10:00, 18:00~22:00 and 2:00~6:00; however, groundwater evaporation intensity for treatments with crop planted was stable and had no obvious consumption periods. It only had a significant change at about 20:00. Daily variation of groundwater evaporation showed more obvious fluctuation in the treatment without crop planted than in the treatment with crop planted. During daytime, especially in the afternoon, groundwater evaporation intensity was significantly reduced(by 0.66 mm·h-1), which was caused by less of water transport rate in soil than atmospheric evaporation capacity. In nighttime, groundwater evaporation intensity was increased by 0.26 mm·h-1, which was mainly due to the fact that watter ttransportt rate in soil was bigger than the atmospheric evaporation capacity. |
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