考洲洋牡蛎养殖海域海-气界面CO2交换通量的时空变化

根据2018年7月、11月和2019年1月、4月对广东考洲洋牡蛎养殖海域进行4个季节调查获得的p H、溶解无机碳(DIC)、水温、盐度、溶解氧(DO)及叶绿素a(Chla)等数据,估算该区域表层海水溶解无机碳体系各分量的浓度、初级生产力(PP)、表层海水CO₂分压[p(CO₂)]和海-气界面CO₂交换通量(FCO₂),分析牡蛎养殖活动对养殖区碳循环的影响。结果表明:牡蛎养殖区表层海水中Chl a、DIC、HCO₃^–和PP显著低于非养殖区;养殖淡季表层海水中pH、DO、DIC、HCO₃^–、和CO₃^2–显著大于养殖旺季,养殖旺季的p(CO₂)和FCO₂显著大于养殖淡季。牡蛎养殖区表层海水夏季、秋季、冬季和春季的海-气界面CO₂交换通量FCO₂平均值分别是(42.04±9.56)、(276...     

长江河口淡水端溶解态无机氮磷的通量

1998年2和9月在长江河口淡水端连续观测了DIN(NO₃-,NO₂-,NH₄+),PO₄3-,流速和流向.结果表明,溶解态无机氮、磷浓度的时空变化较复杂;1998年2月NO₃-,NO₂-,NH₄+和PO₄3-的月通量分别为168241,974.4,19335和2648t,9月的月通量分别为905678,8317,5797和6281t;1998年NO₃-,NO₂-,NH₄+和PO₄3-年通量分别为497.1×104,3.911×104,10.22×104和4.155×104t.     

日本以南西北太平洋溶解态铜、镉和镍的垂直剖面的讨论

本文报道了1990年10月日本以南海水重金属垂直分布的一些结果,讨论了溶解态铜、镉和镍的浓度同生物地球化学环境的关系.表层水中溶解态铜的浓度比500m以浅层的浓度高;在4000m以深,溶解态铜达最大值8.2nmol/dm3.溶解态镍的浓度由表层的3.4nmol/dm3变化到深层的8.5nmol/dm3.最高值出现于较冷的水体中.溶解态镉的垂直剖面属良好的营养盐型分布,溶解态镉与磷酸盐呈线性相关,原子比是△Cd:△N:△P=3.5×10-4:14:1.     

活石（live rock）在珊瑚养殖体系中对NH4+、NO3-的去除作用

Maintaining stable water quality is one of the key processes for recirculating coral aquaculture. Traditional aquarium systems which mainly utilized a nitrification of nitrifying bacteria attached to the surface of massive artificial filter material are difficult to maintain the oligotrophic conditions necessary for coral aquaculture. This study investigated the removal effects of dissolved inorganic nitrogen(ammonia and nitrate) by live rock(LR), a key component in the "Berlin system" coral aquarium. The expression levels of bacterial functional genes, AOA3,amo A and nos Z, were measured on the exterior and interior of LR. The nitrifying and denitrifying bacterial abundance on LR was quantified and the nitrogen nutrient regulatory effects of LR were evaluated. The results demonstrated that LR mainly removed ammonium(NH_4~+) from the water with a mean efficiency of 0.141 mg/(kg·h), while the removal of nitrate(NO_3~–) was not significant. Bacterial diversity analysis showed that ammonia-oxidizing bacteria(AOB) were the most common bacteria on LR, which accounted for 0.5%–1.4% of the total bacterial population, followed by denitrifying bacteria, which accounted for 0.2% of the total population, and the ammonia-oxidizing archaea(AOA) were the least common type(0.01%). The low abundance of denitrifying bacteria may be responsible for the poor nitrate(NO_3~–) removal of LR. Thus, other biological filtration methods are needed in coral aquaria to control nitrates generated from nitrification or biological metabolism.     

南海北部表层沉积物中浮游有孔虫分布特征与环境意义

对南海北部12°以北海域表层沉积物中的浮游有孔虫丰度、属种数量与组合、碳酸盐含量以及硅质生物相对丰度等进行了分析和鉴定,结果表明:随水深的增加,浮游有孔虫的丰度降低、属种数量减少,碳酸盐含量降低,硅质生物相对丰度升高,浮游有孔虫优势种由易溶种转变为抗溶种。浮游有孔虫以及碳酸盐含量等的这些变化与深海碳酸盐的溶解作用密切相关,同时,浊流沉积作用和水团等环境因素也是影响浮游有孔虫丰度与组合以及碳酸盐含量变化的重要因子。     

银-二乙基二硫代氨基甲酸钠法测定铁矿石中砷溶样方式的改进

改进了铁矿石样品溶解方法，尝试用硫-磷混酸溶解铁矿石样品，缩短了分析时间，提高了分析精度。溶解后的样品以银-二乙基二硫代氨基甲酸钠法（Ag—DDTC）用于部级标准物质测定，砷的测定结果与标准值相符；用于碱性矿石如球团样品中砷的分析，多名操作者的测定结果吻合。     

量热学和热动力学研究进展概况

对量热学的发展历史作了简要介绍,并就近年来利用量热法进行各种反应的热动力学研究的进展进行了概述。根据将微量热新技术引入到地质、地球化学领域研究矿物溶解的阶段性成果,展望了地球化学反应热动力学研究的广阔前景。     

花溪河水碳同位素的季节变化及其环境意义

碳的全球生物地球化学循环是与全球变化相关的一系列重大国际合作计划的主要研究内容之一.     

Application of the Common Offset Seismic Reflection Method to Urban Active Fault Surveys

The method and principle of common offset seismic surveys as well as the field data gathering and processing technique were introduced briefly. Through two urban active fault survey examples in Fuzhou and Shenyang, the efficiency and limitation of using the common offset seismic reflection technique to carry out urban active fault surveys were probed. The results show that this technique has the properties of high resolving power, better reconstruction of subsurface structures, and real-time analyzing and interpretation of investigation results on site. This method can be used to quickly locate objects under investigation accurately in the areas with thinner Quaternary overburdens and strong bedrock interface fluctuations.