Studies of community structure and seasonal dynamics of planktonic copepods in saline-alkaline ponds

Abstracts Species abundance and seasonal succession of copepods in saline-alkaline ponds were studied in Zhaodian Fish Farm, Gaoqing County, Shandong Province, from 5 April 1997 to 1 September 1998. The results indicated that in the conditions of salinity ranging from 1.36 to 20 g/L, total alkalinity changing from 2.4 to 7.2 mmol/L and pH 8-9, zooplankton in saline-alkaline ponds was composed of freshwater salt-tolerated species or halophile species, some of which are halobiont species and usually occurs in freshwater. In our study, copepods were predominant in many fish-culture ponds and all control ponds without fishes in spring, late autumn and early winter. Dominant species of copepods were Sinocalanus tenellus, Cyclops vicinus, Thermocyclops taihokuensis. The biomass of copepods in the control ponds without fishes was higher than that of the fish-culture ponds.     

东风盐场卤水中可溶性糖的研究Ⅱ、盐田卤水中可溶性糖的来源、消耗及其调控方法初探

本文研究了东风盐场不同盐度的卤水中可溶性糖的变化及其与微藻优势种的组成和细胞数量之间的关系，卤虫对可溶性糖的调节作用及嗜盐菌对可溶性糖的消耗。结果表明，可溶性糖在低卤区和硅藻、甲藻等微藻密切相关，在中、高卤区与蓝藻和盐藻等密切相关，卤水中的卤虫能通过滤食微藻而有效地控制卤水中可溶性糖的浓度，在结晶卤水中接种嗜盐菌能有效地降解卤水中的可溶性糖，从而达到提高盐质的目的。     

嗜盐细菌的研究进展

回顾评价了近２０年来国内外对嗜盐细胞在分类学，生理生化特征，生态学等方面的研究状况，着重分析总结了国外的研究进展，阐述了嗜盐细菌研究成果在其它科技领域，尤其是高新技术上的应用前景。     

土壤中可溶性盐类测定方法探讨

用水浸法测定土壤中的可溶性盐类,当土壤与加入水的质量之比为1∶6,水浸时间为24～42h,此时测定的可溶性盐类的量具有较好的准确性和可比性。     

氰化提金-- 锌丝置换过程中铅盐应用改进

针对龙头山金矿420坑口原工艺流程锌丝及氰化钠消耗量过大,黄金回收率低的问题,采取优化锌丝置换条件,改进铅盐的添加方式等技术措施,提高了锌丝置换效率,降低了锌丝、氰化钠消耗,同时金回收率提高了3.7%,取得了显著的经济效益。     

亳州盐渍土的分布及其工程地质特征

盐渍土是气候、地貌、地质、工程地质、水文地质等因素综合影响的工程地质灾害,本文在大量调查、分析与研究的基础上,采用了槽探、水样(水化学分析)、土样(土壤含盐量分析、土壤毛细水试验)等综合方法,分析了亳州盐渍土灾害的危害性及对农业生态系统、公路建设的影响,同时,考虑到人为和环境地质因素对盐渍土的影响,圈定了盐渍土的潜在威胁区,从而,预测了盐渍土的发展、演变趋势,因地制宜地提出了整治盐渍土的基本对策与措施。