| Study on spatial and temporal variation of arid index in Yellow River Basin |
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| DOI：10.7606/j.issn.1000-7601.2009.01.46 |
| Key Words: Yellow River Basin (YRB) arid index Penman-Monteith method spatial-temporal pattern Kriging |
| Author Name | Affiliation | | SHI Jianguo | Institute of Environment and Sustainable Development on Agriculture Chinese Academy of Agricultural Sciences,Beijing 100081,China；Baotou Light Industry ＆ Vocational Technical College, Baotou,Inner Mongolia 014045,China | | ZHANG Yanqing | Institute of Environment and Sustainable Development on Agriculture Chinese Academy of Agricultural Sciences,Beijing 100081,China | | HE Wenqing | Institute of Environment and Sustainable Development on Agriculture Chinese Academy of Agricultural Sciences,Beijing 100081,China | | LIU Qin | Institute of Environment and Sustainable Development on Agriculture Chinese Academy of Agricultural Sciences,Beijing 100081,China |
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| Abstract: |
| The arid index was calculated with Penman-Monteith method recommended by the FAO in 1990, based on climatic data of 93 meteorological stations in Yellow River Basin (YRB) authorized by the National Meteorological Bureau from 1957 to 2001, and the arid index distribution in Yellow River basin was also created through the kriging method.The result shows that the spatial distribution of arid index is strongly affected by climatic and geographical factors, and the arid index decreases from the north to the south.From 1957 to the end of 1990s, the trend of arid index was stable at first and then increased. At the same time, the seasonal variation of the arid index was obvious, which was winter >spring>autumn> summer.The maximum value of the arid index occurred in July, August and September in the upper, middle and lower reaches of the YRB respectively, and the minimum values were from November to the next March with a distinct regional variation. |
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