【摘要】 利用1996-2005年平凉市冬春季人工增雪外场试验资料,通过最终作业效果降水变化的研究,提出选择作业区和影响区降水资料作为统计变量,进行人工增雪效果评估符合人工增雪实际。结果表明:陇东冬春季人工增雪在“区域对比试验”、“序列试验”中,增雪效果均显著。对比分析得出,以抗旱保墒为目的的人工增雪试验的效果检验,以“区域对比试验”较为客观实用,全市7县(区)9年共增加雪量145.1 mm,累计增加水量7 798.8×104m3,平均增雪率33.1%,显著性水平0.05。更多还原

【Abstract】 The Longdong region is located in the west Loess Plateau,where it belongs to the typical continental monsoon climate,the annual precipitation varies in a range of 470～638 mm,and 80% of it occurs during the period from May to October.In the region,soil erosion is serious,the utilization ratio of water and heat resources is low,and drought disasters occur frequently.With global climate warming,the interannual change of precipitation in the region is continuously increased,the precipitation has been in a decrease trend since the 1980s,especially in autumn,and drought occurs almost every year since the 1990s.Moreover,the temperature and evapotranspiration from farmlands are continuously increased,the contradiction between water supply and demand becomes more and more serious,and the agricultural production in the region is seriously restricted by the shortage of water resources.In this paper,the effect of artificial snowfall in Pingliang City is researched using the outfield experiment data of artificial snowfall in Pingliang City in winter and spring during the period from 1996 to 2005.It is put forward that the precipitation data in the experimental area can be regarded as the statistical variables to estimate the effect of artificial snowfall.The result shows that the effect of artificial snowfall in both the "regional comparative experiment" and the "sequential experiment" is significant.The analyzed results reveal that the effect of artificial snowfall in the "regional comparative experiment" is objective and practical,the total artificial snowfall in 7 counties and districts in Pingliang City in recent 9 years is 145.1 mm,the accumulated increased water volume is 7.798 8×10~7 m~3,the increase rate of artificial snowfall is 33.1%,and the significance level is 0.05.更多还原