黑龙江省伏旱评估

根据水分平衡原理,利用旱涝系数对黑龙江省1961～2009年伏旱进行了评估。结果表明:1961～2009年黑龙江省伏旱年共10 a,其中6 a为重伏旱年,3 a为特重伏旱年,最重的是1982年,其次是2007年,再次是2000年;1961～1999年伏旱年和重伏旱年有明显的周期变化,伏旱年每10 a中出现1～2 a,重伏旱年为39 a中出现1 a,即每10 a出现0～1 a;从年代变化分析,自2000年以来伏旱发生频率明显增多,范围明显扩大,灾情加重;伏旱存在明显的地域分布,松嫩平原西部为黑龙江省的伏旱易发区,松嫩平原中部、黑河大部分地区、三江平原北部为黑龙江省的伏旱次易发区,其它地区为伏旱不易发生区。

Evaluation of Summer Drought in Heilongjiang Province

According to the water balance principle,using the drought-waterlogging index,the summer drought between 1961 to 2007 was evaluated.The result indicated that there were nine summer drought years during 1961～2007 in Heilongjiang province,and five years were more badly drought years,three years were the most.The heaviest drought disaster in the history was in 1982,next was in 2007,then was in 2000.Summer drought years and badly summer drought years present obvious periodic changes in 1961～1999.Summer drought years happened once to twice every ten years.Badly summer drought years happened once in thirty-nine years,namely zero to one time every ten years.Analysis of age changed showed that summer drought occurred frequency increased clearly from 2000,and the range expanded clearly,economy lost in a big way.The summer drought has the obvious region distribution.West Songnen Plain in Heilongjiang province was the frequency region for the summer drought happening,followed by middle Songnen Plain,greater part of Heihe city,North Three-River Plain,others were infrequent happening area.