| EVAPOTRANSPIRATION OF LOW-LYING PRAIRIE WETLAND IN MIDDLE REACHES OF HEIHE RIVER IN NORTHWEST CHINA |
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| 作者姓名： | Yusuke YAMAZAKI Jumpei KUBOTA |
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| 作者单位： | Research Institute for Humanity and Nature Kyoto 602-0778 Japan，Research Institute for Humanity and Nature Kyoto 602-0778 Japan |
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| 基金项目： | Under the auspices of the Sino-Japan Cooperation Project and the Special Fund of China Metrological Administration （No. CCSF-2005-2-QH39） |
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| 摘 要： | 1 IN T R O D U C T IO NW aterbalance and interactions are foundation to utilizew aterresources rationally in arid inland river basins inC hina (W U etal.,2005).W ateravailability in those ar-eas m ay be the m ain constraint to poverty alleviation,publiche…
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| 关 键 词： | 黑河 湿地 西北地区 中国 内陆盆地 水平衡 |
| 文章编号： | 1002-0063（2005）04-0325-05 |
| 收稿时间： | 2005-08-10 |
Evapotranspiration of low-lying prairie wetland in middle reaches of heihe river in northwest China |
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| Yusuke YAMAZAKI,Jumpei KUBOTA.EVAPOTRANSPIRATION OF LOW-LYING PRAIRIE WETLAND IN MIDDLE REACHES OF HEIHE RIVER IN NORTHWEST CHINA[J].Chinese Geographical Science,2005,15(4):325-329. |
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| Authors: | Wu Jin-kui Ding Yong-jian Wang Gen-xu Shen Yong-ping Yusuke Yamazaki Jumpei Kubota |
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| Institution: | WU Jin-kui1,2,DING Yong-jian1,2,WANG Gen-xu1,SHEN Yong-ping1,2,Yusuke YAMAZAKI 3,Jumpei KUBOTA3 |
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| Abstract: | Low-lying prairie wetland, which has characteristics of both grassland and wetland, has irreplaceable ecological functions
in inland river basins of Northwest China. Owing to its small-scale distribution, so far, the observation and research on
it are rare. The estimation of evapotranspiration is significant to ecological and environmental construction, scientific
management of pasture and protection of wetland. For studying the evapotranspiration (ET) of low-lying prairie wetland in
the middle reaches of the Heihe River, an inland river, in Northwest China, the automatic weather station in Linze Ecological
Experimental Station of Lanzhou University (39°15′3″N, 100°03′52″E), Linze, Gansu Province, was selected as a case study.
Based on meteorological data collected, Bowen-Ratio Energy Balance (BREB) method was used to calculate the evapotranspiration
(ET) of low-lying prairie wetland. The analysis results showed that in a whole year (September 2003–August 2004), the total
ET was 611.5 mm and mean daily 1.67mm/d. The ET varied with different growing stages. In non-growing stage (NGS), initial
growing stage (IGS), middle growing stage (MGS) and end growing stage (EGS), the ET was 0.57, 2.01, 3.82 and 1.49mm/d, with
a percentage of total ET of 18.26%, 9.20%, 61.83% and 10.71% respectively. In March, ET began to increase. But in April, the
ET increased most. After that, it increased gradually and got the maximal value in July. From then on, the ET decreased gradually.
In September, the ET decreased rapidly. With the ending of growing and the freezing of soil, the ET stopped from the middle
of November to February in next year. Hourly ET analysis showed that at 8:00 a.m. (during MGS at 7:00 a.m.), the evapotranspiration
began, at 13:00 p.m. got its maximal value and at 19:00 p.m. (during MGS at 20:00 p.m.), the evapotranspiration stopped. The
intensity of ET in sunny day was much larger than that in cloudy day in the same growing stage. |
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| Keywords: | evapotranspiration low-lying prairie wetland inland river basin |
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