气候变化与太湖蓝藻暴发的关系

对太湖区域40多年来气温、降水量、日照时数随时间变化的特征进行了分析,并对太湖蓝藻的爆发时间、次数、等级进行了统计,采用对比分析法对气候变化与太湖蓝藻暴发的关系进行了分析。结果表明:太湖区域1961—2007年总的气候倾向率,年平均气温为0.35℃.10a-1,年累计降水量为31.33mm.10a-1,年累计日照时数为-69.00h.10a-1;而突变点,气温在1989年,降水量在1979年,日照时数在1999年,在突变点年份后,气温升高、降水量增加和日照时数减少的趋势更加明显。2000—2007年气候变得异常,主要表现为气温上升速度加快,约为1961—2007年的3.7倍,5月和10月的这种气候倾向性更明显;降水量减少,比1961—2007年减少了178.10mm.10a-1,日照时数增加,比1961—2007年增加了244.23h.10a-1。气候变暖速度加快为太湖蓝藻的生长发育提供了热量条件;降水量减少,加速了太湖水质恶化,为蓝藻暴发提供了有利的水质环境条件;日照时数增多,充足的光照为蓝藻生长发育提供了优良的光合条件;温度偏高、降水量偏少、日照时数偏多的气候变化趋势对应太湖蓝藻暴发的次数也偏多,造成了太...

Relationships between climatic change and cyanobacterial bloom in Taihu Lake

Based on the analysis of the variations in air temperature,precipitation,and sunshine hour in last 40 years in Taihu Lake region.a statistical analysis was made on the relationships between the climatic change and the occurrence time,frequency,and grade of cyanobaeterial bloom in Taihu Lake.In the study region,the overall climate change trend from 1961 to 2007 was that the mean annual air temperature increased by 0.35℃·10a~(-1),annual total precipitation increased by 31.33 mm·10 a~(-1),and annual total sunshine duration decreased by 69.00 h·10 a~(-1).The turning points of the variations in air temperature,precipitation,and sunshine hour were in 1989,1979,and 1999,respectively.In 2000-2007,the climate changed exceptionally,which was mainly manifested in the rapid increase of air temperature(about 3.7times of that in 1961-2007 and more obviously in May and October),the decrease of precipitation(about 178.10 mm·10 a~(-1) less than that in 1961-2007),and the increase of sunshine hour (244.23 h·10 a~(-1) more than that in 1961-2007).The increasing speed of climate warming provided thermal advantages for cyanobacteria growth,and the decreasing precipitation worsened the water quality and made the cyanobacterial bloom occurred more quickly.The increasing sunshine provided ample illumination to cyanobacteria growth.The climate trend of elevated air temperature,decreasing precipitation,and increasing sunshine hour was corresponded to the more frequencies of eyanobacterial bloom occurrence in Taihu Lake,leading to the appearance of cyanobacterial bloom in the Lake more and more seriously.