排序方式： 共有8条查询结果，搜索用时 0 毫秒
1
1.
实验在3个60m3的围隔水体中进行,除对照袋外,矿渣污染浓度分别为20ppm和130ppm(干重),细菌生物量和生产力分别用吖啶橙染色荧光计数法和氚化胸腺嘧啶核苷示踪DNA合成法进行:在16天的实验中,高浓度污染袋内细菌生物量和生产力出现两个明显的高峰值,第一个高峰值主要是由于细菌的捕食者微型鞭毛虫受到矿渣的抑制而引起的,而第二个高峰值则是浮游植物水华后释放出可溶性有机物及浮游植物细胞衰老引起的,与对照袋相比,污染袋由于矿渣在水中的消光作用,使袋内浮游植物水华期推迟两天,从而使细菌的水华也推迟两天,污染袋内总的细菌生产力比对照袋要大得多,本文对这些现象进行初步讨论. 相似文献
2.
3.
在海洋围隔生态系实验中加入迄今最低浓度的无机汞,以研究汞的迁移通量、形态分布和收支。加汞后,汞从水柱中被排除的行为可用一级反应动力学描述。在该生态系内汞被排除的半寿期,与初级生产力和浮游植物特性如个体大小、浮游能力等有关。对照围隔生态系内,0.01μg Hg/cm~2·a的汞垂直通量与海湾现场测量值一致。在自然条件下,溶解汞是水中的主要形态,占73％。加汞后,颗粒汞迅速上升,可达70％以上。浮游植物对汞的富集因子为10~5级。汞在沉积物、器壁和水体中的回收只占52.3％。 相似文献
4.
The lowest addition of mercury (0.1 ug Hg 1-1) was used in CEEs for research on mercury flux, speciation and budget. The removal behavior of mercury by phytoplankton in water columns of CEEs can be described by first order kinetic equations for total and particulate mercury in the CEE spiked by mercury. The removal rate of mercury in water columns depends on the size and productivity of phytoplanton in a water column to which mercuric ions were added. A 4.4 day half-life time and a 2.8 day half-life time for total and particulate mercury respectively was obtained in diatom bloom. During microflagellate bloom a 30 day total mercury half-life time was estimated with increase of particulate mercury in the water column. The 0.010 ug Hg cm-2y-1 mercury flux rate that was attained in the control bag agreed with the values from field measurements in Saanich Inlet where the bags Were launched.The proportion of total mercury to dissolved and particulate mercury depended also on the size, productivity, and concen 相似文献
5.
A CEE (2.5 m by 16 m) has been used to study the budget of organic production by measuring the changes in POC/N, oxygen and 14CO, uptake through three-week period. 14C primary production measurements were conducted with 4-hours and 24-hours incubation periods, and with size fractionation. Different types and sizes of bottle effects were examined. Results showed that the oxygen method production was highest, followed by the 14CO2 uptake method, and POC gain showed the lowest. The value of PQ should be more than 1.7. The ratio of 4-hour incubation to 24-hour incubation was 2.42±0.22, indicating that net daily production is equal to 9.7±0.9 h of illuminated growth. Different types and sizes of bottles had little effect on primary production. 相似文献
6.
本文介绍了在加拿大Saanich内湾进行的小型海洋生态系围隔实验中,观测了在低光照下Enersperse 700分散剂分散中国胜利原油的微生物降解及其与营养盐的关系。实验结果表明:分散原油作为微生物的基质有利于微生物生长,油浓度与菌数有正的相关性;氮和磷在微生物降解原油污染物中起着重要作用,高营养盐实验桶菌数高,分散原油降解速度也较快;在添加原油的实验桶原油降解过程,营养盐同时被消耗,而未添加原油的对照桶,营养盐保持不变。 相似文献
7.
本文描述用受控生态系实验装置(CEE),测定海水中颗粒有机碳产额,溶解氧增量和碳-14吸收率,以研究海洋生态系中生物量和初级生产力的变化。同时,比较不同的孵育时间,不同粒度藻类,不同体积和类型瓶子对碳-14示踪法测定生产力的影响。结果表明,溶解氧方法所测的生产力最高,碳-14方法次之,颗粒有机碳增量法最低,即光合作用商应高于1.7;颗粒有讥碳增量约为碳-14生产量的61%,4小时和24小时不同孵育时间所测生产力比值为2.42±0.27,不同体积和类型的瓶子所测生产力没有显著差别,本文建议用多种测定方法,以逼近海洋初级生产力的真值。 相似文献
8.
1