首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1篇
  1988年   1篇
排序方式: 共有1条查询结果,搜索用时 15 毫秒
1
1.
Phosphorus and nitrogen excretion rates by zooplankton communities from two eutrophic and shallow Dutch lakes were measured in laboratory. The variations in excretion rates in the lakes (May–October) were caused mainly by fluctuation in zooplankton biomass. Mean summer excretion rates (June–September) were 2.4 and 0.9 µg PO4P·1–1·d–1 in Lake Loosdercht and Lake Breukeleveen, respectively. This difference between the lakes was caused mainly by the lower zooplankton biomass in Lake Breukeleveen. The excretion of 2.4 µg PO4P·1–1·d compared with the calculated P-demand of phytoplankton of 8.0 µg PO4P·1–1·d–1 is substantial in the summer (June–September) and far more important than the external P-supply of 0.4 µg P·1–1·d–1 and sediment release of 0.5 µg P·1–1·d–1. Both temperature and composition of zooplankton affected the weight specific excretion rates of the zooplankton community. The weight specific community excretion rates of P and N increased with temperature (exponential model); 1–8 g PO4P·mg–1 zooplankton-C·d–1 and 5–42 µg NH3N·mg–1 zooplankton-C·d–1 (10°C–20°C).  相似文献
1
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号