中国三疣梭子蟹Portunus trituberculatus Miers的研究

本文概述了国内有关三疣梭子蟹形态、习性、繁殖、发育、生长、种群、生理、成分和养殖等方面的研究现状，探讨了关于三疣梭子蟹研究的发展方向。     

A model study of influence of circulation on the pollutant transport in the Zhujiang River Estuary and adjacent coastal waters

A tracer model with random diffusion coupled to the hydrodynamic model for the Zhujiang River Estuary (Pearl River Estuary, PRE) is to examine the effect of circulations on the transport of completely conservative pollutants. It is focused on answering the following questions: (1) What role does the estuarine plume front in the winter play in affecting the pollutants transport and its distribution in the PRE? (2) What effect do the coastal currents driven by the monsoon have on the pollutants transport? The tracer experiment results show that: (1) the pollutant transport paths strongly depend on the circulation structures and plume frontal dynamics of the PRE and coastal waters; (2) during the summer when a southwesterly monsoon prevails, the pollutants from the four easterly river inlets and those from the bottom layer of offshore stations will greatly influence the water quality in Hong Kong waters, however, the pollutants released from the four westerly river-inlets will seldom affect the water quality of Hong Kong waters due to their transport away from Hong Kong; (3) during the winter when a northeasterly monsoon prevails, all pollutants released from the eight river gates will be laterally transported seaward inside the estuary and transport westward in the coastal waters along the river plume frontal zone. However, pollutants released from the surface layer of offshore stations near or east of the Dangan Channel will be carried into the coastal waters of Hong Kong by the landward component of the westward coastal current driven by the winter northeasterly monsoon. But the pollutants from the bottom layer of the offshore stations will be carried away from the offshore by the bottom flow driven by the northeasterly monsoon. This implies that only surface-released matter from offshore stations will affect the water quality of the coastal waters around Hong Kong during the winter when a northeasterly monsoon prevails.     

杜氏藻与大肠杆菌跨界融合初探

以链霉蛋白酶制得了杜氏藻(嗜盐单胞绿藻)的原生质体。采用聚乙二醇(PEG)-钙离子法将它们与大肠杆菌(含氯霉素乙酰转移酶基因质粒)的球1,20,1状体进行融合。“融合子”酷似杜氏藻。它们对氯霉素抗性的显著提高寓示了大肠杆菌的质粒已转移到“融合子”细胞中;而且,“融合子”的蛋白质组分与杜氏藻和大肠杆菌相比已发生了较明显的变化。     

应用底栖动物监测长江口南岸污染的研究

作者提出1985.8—1986.7月长江口南岸底栖动物种类组成、污生生态、群落特征和长江口南岸水、底泥和生物中重金属含量,并以污生生态特征和重金属分布特征对该区污染状况作出评价。本文还就各断面的优势类群、多样性指数、生物重金属含量与污染源的关系及长江口南岸底栖动物的污生生态指标种和重金属污染指标种进行了讨论。     

Climate extremes: an observation and projection of its impacts on food production in ASEAN

Climate change alters global food systems, especially agriculture and fisheries—significant aspects of the livelihoods and food security of populations. The 2014 IPCC Fifth Assessment Report identified Southeast Asia as the most vulnerable coastal region in the world, and highlighted the potential distribution of impacts and risks of climate change in the region. While climate hazards may differ across geographical regions, the impact of climate extremes on food production will affect marginal farmers, fishers and poor urban consumers disproportionately, as they have limited capacities to adapt to and recover from extreme weather events. Governments and other stakeholders need to respond to climate extremes and incorporate adaptation into national development plans. Unfortunately, there is still limited peer-review publication on the subject matter. This paper presents some findings from research on observed and projected loss and damage inflicted by climate extremes on agricultural crops in Southeast Asia.     

Zircon LA-ICP MS U-Pb Dating of the Longkang Andesitic Ignimbrites from Jiuzhaigou： Evidence of the Mianlue Suture Westward Extension

Genesis of metasedimentary-volcanics outcroped in Kangxian-Pipasi-Nanping (康县-琵琶寺-南坪) tectonic zone is closely related with tectonic evolution of the Mianlue (勉略) Ocean. In the west end of Kangxian-Pipasi-Nanping tectonic zone, there are hundred meters of andesitic ignimbrites and tuffites. Zircon U-Ph dating on these volcanies has great significance to the tectonic implication of zircons from Longkang andesitic ignimbrites are magmatic genesis with oscillatory zoning and high U ((35-750) ppm), Th ((311-717) ppm) contents with high Th/U (0.44-1.30) ratios. The measured 206pb/238U ratios are in good analytical precision, yielding a weighted mean age of (246±3) Ma (MSWD=2.6, n=12, 2σ). Some detrital zircons have also been observed, they have maximal concordia area. Combined with regional geology and the volcanic rocks in the studied area, the (246±3) Ma zircon U-Pb age suggests a Late Permian orogenic volcanism and provides important geochronology evidence for the Mianlue suture westward extension.     

河北昌黎典型海岸沙丘的沉积构造及其发育模式

采用探地雷达探测了昌黎海岸沙丘区典型横向沙脊和新月形沙丘的沉积构造,据此初步揭示了研究区海岸沙丘的沉积序列特征和发育过程。结果表明,昌黎海岸带在2 000 a BP波浪作用下发育滨岸沙坝,沙坝主要以向海向陆缓倾斜的沉积构造为主,现今的风成沉积发育于滨海相沙坝之上。海岸带向海一侧经历了潮上带前丘到横向沙脊的过程,横向沙脊在东北风的作用下主要发育向陆倾斜的高角度交错层理,同时由于向岸合成风力的阶段性变化,这些层理的倾角略有差异,记录了海岸带风沙活动的周期性变化;内侧新月形沙丘由4组倾角不同的层理组成,被较大规模的二级界面分隔,复合新月形沙丘(链)经历了由盾状沙堆到典型新月形沙丘的加积发育并遭受风蚀的过程。     

Indium Mineralization in Copper–Tin Stratiform Skarn Ores at the Saishitang–Rilonggou Ore Field,Qinghai, Northwest China

The Saishitang–Rilonggou Ore Field (SROF), which includes the Saishitang, Tongyugou, and Rilonggou ore deposits as well as other scattered occurrences, is located in the Elashan region in Qinghai Province, and is a significant Cu–Sn ore field in NW China. These ores are hosted in stratiform skarn deposits with the main metals being Cu and Sn, as well as Zn, Pb, Au, Ag, and trace elements (e.g. Ga, Ge, Se, and In). Bulk‐rock geochemical analyses of 50 ore samples from the three deposits show that In contents in the Saishitang deposit range from 0.03 to 39 ppm (average 12.7 ppm, n = 19), with 1000 In/Zn values that vary from >0.01 to 29.83 (average 4.29). Indium contents in the Tongyugou deposit vary from 7.51 to 131 ppm (average 28.37 ppm, n = 13), with 1000 In/Zn values from 0.74 to 48 (average 17.55). Finally, indium contents in the Rilonggou deposit vary from 0.73 to 120 ppm (average 36.15 ppm, n = 18), with 1000 In/Zn values from 0.33 to 47 (average 8.52). Indium is hosted mainly in sphalerite, while some other In‐bearing minerals (e.g., roquesite, stannoidite, and stannite) are present locally within the ore field. Roquesite, which replace or fill bornite, occurs in bornite‐rich ores in the Saishitang deposit. This is the first reported Chinese locality of roquesite. Based on previously reported Zn resources, a total of 136 tons of In is calculated to be hosted in the SROF, with 30, 66, and 40 tons of In attributed to the Saishitang, Tongyugou, and Rilonggou deposits, respectively. The differences in indium contents among the deposits and their respective geological histories and characteristics suggest that the origin of indium relates to volcanogenic metallogenesis in an early Permian volcano‐sedimentary basin. Based on the evaluation of In resources, future mining operations should include the recovery of indium in the Tongyugou and Rilonggou deposits.     

High‐Precision Mass‐Dependent Molybdenum Isotope Variations in Magmatic Rocks Determined by Double‐Spike MC‐ICP‐MS

Small mass‐dependent variations of molybdenum isotope ratios in oceanic and island arc rocks are expected as a result of recycling altered oceanic crust and sediments into the mantle at convergent plate margins over geological timescales. However, the determination of molybdenum isotope data precise and accurate enough to identify these subtle isotopic differences remains challenging. Large sample sizes – in excess of 200 mg – need to be chemically processed to isolate enough molybdenum in order to allow sufficiently high‐precision isotope analyses using double‐spike MC‐ICP‐MS techniques. Established methods are either unable to process such large amounts of silicate material or require several distinct chemical processing steps, making the analyses very time‐consuming. Here, we present a new and efficient single‐pass chromatographic exchange technique for the chemical isolation of molybdenum from silicate and metal matrices. To test our new method, we analysed USGS reference materials BHVO‐2 and BIR‐1. Our new data are consistent with those derived from more involved and time‐consuming methods for these two reference materials previously published. We also provide the first molybdenum isotope data for USGS reference materials AGV‐2, the GSJ reference material JB‐2 as well as metal NIST SRM 361.