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[1]FU Jianxin,CAO Guangchao,LI Lingqin,et al.Analysis of Temporal and Spatial Variation Characteristics of Precipitation in the South Slope of Qilianshan Mountains and Its Nearby Regions During 1960-2014[J].Research of Soil and Water Conservation,2018,25(04):152-161.

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Analysis of Temporal and Spatial Variation Characteristics of Precipitation in the South Slope of Qilianshan Mountains and Its Nearby Regions During 1960-2014

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 04 Page number: 152-161 Column: Public date: 2018-06-13

Title:: Analysis of Temporal and Spatial Variation Characteristics of Precipitation in the South Slope of Qilianshan Mountains and Its Nearby Regions During 1960-2014

Author(s):: FU Jianxin^1,2, CAO Guangchao^1,2, LI Lingqin^1,2, CAO Shengkui^1,2, TANG Zhongxia^1,2, YANG Xiaomin^1,2, JIANG Gang^1,2, YU Min^1,2, YUAN Jie^1,2, DIAO Erlong¹; 1. Key Laboratory of Qinghai Province Physical Geography and Environmental Process, Qinghai Normal University, Xining 810008, China;
2. College of Geography Science, Qinghai Normal University, Xining 810008, China

Keywords:: precipitation day; precipitation intensity; spatial distribution; Qilianshan Mountains

CLC:: P426.6

DOI:: -

Abstract:: Qilianshan Mountain is a national ecological reserve at present and in the future, and is an important water conservation function area of ‘Silk Road Economic Belt’, the precipitation directly affects the quality of the ecological environment, so in the new situation, it has important theoretical and practical significance to study the precipitation change in Qilianshan Mountains area. Based on precipitation day and precipitation intensity data observed by 19 meteorological stations in the south slope of Qilianshan Mountains and its nearby regions from 1960 to 2014, the methods of linear regression, correlation analysis, polynomial trend, moving mean Mann-Kendall and moving test and ArcGIS were used to analyze the temporal variability and spatial distribution of air temperature. The results are as follows. The annual precipitation days and precipitation intensity showed a slow fluctuation growth trend, and the growth rates were 0.030 d/year and 0.009 mm/year, respectively; except for winter precipitation, the trend of diurnal variation was increasing, while the rest of the seasons had little change. The summer precipitation intensity had the great contribution to the annual precipitation; the variation trend of precipitation days in 1990s was negative growth (-0.326 d/year), and the trend of precipitation intensity was the biggest (0.381 mm/decade), and the interdecadal variation fluctuated greatly. The average number of days of precipitation and precipitation were influenced by southeast monsoon and terrain, showing an overall decreasing trend from southeast to northwest. The precipitation of the southern slope was more than precipitation of the north slope；ratios of the number of meteorological stations of precipitation days to precipitation intensity increase in both positive and negative is 10∶9 and 17∶2, respectively; the positive increase of precipitation intensity in the four seasons accounted for a larger proportion than the number of precipitation days, except that autumn precipitation mutation was not obvious, the mutation occurred in spring, summer and winter; and the spatial distribution of interdecadal variation of each site was different.

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