黑龙江建三江地区地下水动态趋势突变点分析

农业区地下水动态规律是农业水资源管理的重要依据。采用双向回归突变分析方法研究黑龙江建三江地区(19922011)地下水埋深序列的趋势突变点,结合水稻面积增长数据进行对比分析,找出地下水动态趋势突变与灌溉面积的响应关系,同时运用标准化降水指数(SPI)方法来分析研究地下水动态趋势突变与降水之间的响应关系。结果表明:建三江地区地下水水位的下降趋势具有明显的突变特征,整体上呈"快慢快"的特点,趋势突变时间多发生在20002001年间和20062007年间;在第一阶段和第二阶段,地下水水位下降趋势受水稻种植面积与降水影响,第三阶段主要受水稻种植面积增长的控制。

Trends Mutation Nodes of Groundwater Dynamic in Jiansanjiang Area of Heilongjiang Province

Groundwater dynamic law is an important basis for agricultural water management in agricultural regions.Two-dimensional regression mutation analysis method was used to find the trend mutation of groundwater depth series of 15 farms in Jiansanjiang area,and comparative analysis of the annual growth data of rice cultivation area was performed to find out the response-ralationship between the groundwater dynamic trends mutation and the rice irrigation area.Simultaneously,the method of standardized precipitation index was used to study the impact of precipitation on groundwater dynamic trends mutation.It is showed that the groundwater drawdown trends have time-segment character with declining quickly in initial and last stage while relatively more slowly in intermediate stage and the downward trend mutation of groundwater levels of the most farms occurred from 2000 to 2001 and from 2006 to 2007.The groundwater drawdown trends were controled both by the annual growth data of rice cultivation area and precipition in the first and second stages,while mainly controlled by the former in the last stage.