摘要
1997年和 1998年夏季桥墩水库相继发生大面积蓝藻水华 .1998年 9月 1m2 水面喷洒 38 8g改性明矾浆应急除藻 ,当年蓝藻水华基本消失 .1998年底和 1999年初 ,1hm2 水面放养尾重 2 0g左右鲢、鳙鱼种 12 0 0尾 .1999年仅局部发生蓝藻水华 ,8月份水库浮游蓝藻数量比 1998年同期下降 77 7% ,透明度提高 1 5m ;2 0 0 0和 2 0 0 1年水库不再出现蓝藻水华 ,水体表观质量明显提高 ,与 1998年 8月同期比较 ,透明度提高 2 4m ,总氮下降 6 1 1% ,总磷下降 5 9.4 % ,浮游蓝藻总量由 1998年的 10 4 35 5× 10 4个细胞 L下降至 14 3 3× 10 4个细胞 L ,蓝藻个体数量比例从 1998年的 99 2 %下降至 31 5 % .水体富营养状况从治理前的中—富营养类型恢复到中—贫营养类型 .
The blue green algae bloom broke out in the summer of 1997 and 1998 in Qiaodun reservoir. The emergency dealing with the “bloom' by insufflating ameliorated alum plasm of 38.8?g each square meter of water was carried out in Sept. of 1998 and the “bloom' disappeared this year. 1200 seedlings of silver carp and bighead with individual weight of 20?g per hectare water were cultured in the waterbody during the end of 1998 to the beginning of 1999. The cell number of Cyanophyceae in Aug. of 1999 descended by 77 7 percent and the transparency heightened 1 5 meters according to the corresponding period of 1998. The blue green bloom appeared no longer in 2000 and 2001, and the sight of water meliorated apparently. Compared with the corresponding period of 1998, The transparency in Aug. of 2000 heightened 2 4 meters, of T N and T P decreased by 61 1 and 59 4 percent respectively. The cell number of Cyanophyceae dropped to 143 3×10 4 per liter from 10435 5×10 4 per liter of 1998. The number proportion of Cyanophyceae dropped to 31 5 percent from 99 2 percent of 1998. The water status of eutrophication got back to medium dystrophic type from medium eutrophic type of 1998.
出处
《环境科学学报》
CAS
CSCD
北大核心
2002年第6期732-737,共6页
Acta Scientiae Circumstantiae
基金
中科院地理科学与资源所知识创新工程领域前沿项目 (CX10G A0 0 0 6 )
浙江省自然科学基金项目 (30 0 2 80 )
关键词
治理
修复
环境生态工程
水库
富营养化
蓝藻水华
明矾浆
水体污染
reservoir
eutrophication
blue green bloom
alum plasm
Hypophthalmichthys molitrix
Aristichthys nobilis
ecological enginee ring
