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| Variation trend and spatial distribution characteristics of precipitation in recent 50 years in Heilongjiang Province |
| Jin Chunxiang, Wang Xiuru, Wang Xi, Hou Kun, Wang Duo |
| Key Laboratory of Soil & Water Conservation and Desertification Combating,Ministry of Education, School of Soil and Water Conservation, Beijing Forestry University, 100083, Beijing, China |
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Abstract Based on the collected precipitation data from 1960 to 2012 at eight typical meteorological stations in Heilongjiang Province, namely Huma, Sunwu, Qiqihar, Fujin, Anda, Harbin, Jixi and Mudanjiang stations, the variation trend and spatial distribution characteristics of precipitation in recent 50 years in Heilongjiang province were analyzed by using the methods of linear regression, Mann-Kendall technique and spatial interpolation. The results demonstrated that: 1) The decadal variation pattern of precipitation followed “two down and one up”or “two up and one down”at a 30-year cycle and it turned into the rain-rich period from 2012. 2) The average annual precipitation was above 500 mm except for Qiqihar, Huma and Anda stations. Precipitation occured mainly in summer time, which accounted for about 64% of the annual precipitation, and changes in monthly precipitation for many years for all stations showed a single-peaked curve. 3) The inter-annual variation of precipitation at Sunwu and Jixi stations showed a slightly decreasing trend. 4) The spatial distribution of precipitation for many years showed a pattern of decreasing from Sunwu and Mudanjiang stations as the center to surrounding regions, and that in spring time was rather consistent with that for many years. 5) There were two abrupt changes of annual precipitation in the mid 1980s and early 2000s in northern and southern Heilongjiang Province while no obvious changes occurred in eastern and western parts. Our analysis of the variation of precipitation and spatial distribution in Heilongjiang Province in the recent 50 years may provide useful guidance for the research work, water resources allocation and the production practice in the area.
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Received: 07 May 2014
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