摘要
2009年12月份，在福建某河流发现大面积水华，河水呈深褐色．经对气温、水温、pH、溶解氧、高锰酸盐指数、氨氮、总氮、总磷以及藻细胞密度、叶绿素a等因子的监测，发现水巾有甲藻、隐藻、硅藻、绿藻、蓝藻、裸藻和其它常见种，其中优势种为佩氏拟多甲藻（Peridiniopsispenardii），细胞密度为0．1×10^5-333×10^5cells／L．水体营养盐丰富，总氮浓度为2．50—8．65mg／L、总磷浓度为0．09—115mg／L．另外，pH值、溶解氧异常升高，水华反反复复持续一个多月时间．经相关分析，拟多甲藻细胞密度与气温、pH值和总氮相关系数分别为一0．323（P=0．027）、0．327（P=0．025）和0．316（P=0．030），湿著相关，偏相关分析表明，拟多甲藻细胞密度与水温相关系数为-0．4894（P=0．008），非常显著负相关结果显示，pH值和溶解氧升高是甲藻水华产生的表征现象，总氮可能是本次甲藻水华生长的限制网子，而气温和水温的变化既是甲藻水华产生的重要原因，但超过甲藻适宜的生长温度对其也起到一定的抑制作用．由于调查区干旱、少雨、梯级电站过密等因素所导致的水流速过缓，加上足够的营养盐和合适的温度，促使本次拟多甲藻水华的发生．
A large dinoflagellate bloom were found in Fujiau Province in January and February of 2009. Water temperature, pH, dissolved oxygen, permanganate index, ammonia nitrogen, total nitrogen, total phosphorus and algal cell density, chlorophyll-a and other factors were monitored. Dominant species, Peridiniopsis penardii, cell density reached 0. 1×10^5 - 333 ×10^5 cells/L, and total nitrogen concentration was 2.50 -8.65mg/L, total phosphorus concentration 0. 09 1.15mg/L. In addition, pH, dissolved oxygen unconventionally increased in more than a month duration. By correlation analysis, cell density of P. penardii and temperature （ r = - O. 323, P = 0. 027）, pH value （ r = O. 327, P = 0. 025 ） and total nitrogen （ r = O. 316, P = 0. 030 ） were significantly correlated. Partial correlation analysis showed that cell density of P. penardii and water temperature was signifieantly negative correlation （ r = - 0. 4894, P = 0. 008）. The results showed that the increase of pH and dissoolved oxygen was the phenomenon of dinoflagellate bloom, and total nitrogen nmy be the growth linfiting faetors of dinoflagellate, and changes in air temperature and water temperature was the important reason of oceurence of dinoflagellate bloom. Other factors, drought of the investigation area, slow rearer flow dense, coupled with sufficient nutrients and suitable temperature, led to occurrenee of dinoflagellate bloom.
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2010年第3期405-410,共6页
Journal of Lake Sciences
关键词
拟多甲藻
水华
总氮
限制因子
Peridiniopsis penardii
water bloom
total nitrogen
limiting factor
