南沙海区沉积物沉积速率的测定和沉积环境探讨

运用~(230)Th_(ex)和~(230)Th_(ex)/~(232)Th方法测定柱状样NS87—11样品的沉积速率分别为1.51cm/10~3年,1.06cm/10~3年,结合N元素的含量以及Th/U比值,氧同位素资料等讨论本沉积区的沉积环境和古气候的变化特征,认为本柱样中更新世以来经历海平面上升→下降→上升→下降→上升的格局,古气候反映暖→冷→暖→冷→暖。     

海洋对热带气旋响应的研究

建立一个二层非线性原始方程海洋模式，用以研究海洋对静止和以不同移速移动的热带气旋的响应。数值试验结果表明，海洋对静止ＴＣ的响应，具有不对移性；在ＴＣ中心处，抽吸使混合层变浅，在ＴＣ最大风速半径处，大风夹卷明显使ＭＬ加深和海表温下降；海洋对移动ＴＣ的响应，具有右偏性，且随移速加快而加剧。ＭＬ深度和ＳＳＴ的变化对ＴＣ移速十分敏感，而海流则不同。     

Sulfur isotopic composition of modern seafloor hydrothermal sediment and its geological significance

ＩＮＴＲＯＤＵＣＴＩＯＮＤｕｒｉｎｇｔｈｅｐｅｒｉｏｄｏｆｅａｒｌｙ 1 980ｓｔｏｍｉｄ 1 990ｓ ,ｗｉｔｈｔｈｅｒａｐｉｄｄｅｖｅｌｏｐｍｅｎｔｏｆｅｘｐｌｏｒａｔｉｏｎｔｏｔｈｅｓｅａｆｌｏｏｒｈｙｄｒｏｔｈｅｒｍａｌａｃｔｉｖｉｔｉｅｓ ,ｔｈｅｓｕｌｆｕｒｉｓｏｔｏｐｉｃｃｏｍｐｏｓｉｔｉｏｎｏｆｈｙｄｒｏｔｈｅｒｍａｓｅｄｉｍｅｎｔｓａｒｏｕｎｄｔｈｅｗｏｒｌｄｈａｄｂｅｅｎｃａｒｒｉｅｄｏｕｔｔｏｓｏｍｅｅｘｔｅｎｔ (ＺｉｅｒｅｎｂｅｒｇａｎｄＳｈａｎｋｓ ,1 988;ＢｌｕｍａｎｄＰｕｃｈｅｌ…     

互花米草总黄酮对小鼠免疫功能的影响

互花米草总黄酮(TFS)是从盐沼植物互花米草中分离得到的一种免疫活性物质。在研究TFS对小鼠免疫功能的影响时发现TFS156.25×10~(-6)ip qd×8导致由环磷酰胺引起的免疫抑制小鼠的胸腺重量增加。TFS154.25×10~(-6)sc qd×5还显著提高C_(57)/BL和昆明小鼠腹腔巨噬细胞的吞噬百分率和吞噬指数。TFS 3.125,12.5ug/ml在体外可明显促进由ConA诱导的~3H-TdR参入的淋巴细胞转化。     

Period components in the monthly mean sea level variations in the Pacific Ocean

ＰｅｒｉｏｄｃｏｍｐｏｎｅｎｔｓｉｎｔｈｅｍｏｎｔｈｌｙｍｅａｎｓｅａｌｅｖｅｌｖａｒｉａｔｉｏｎｓｉｎｔｈｅＰａｃｉｆｉｃＯｃｅａｎ￥ＴｉａｎＳｕｚｈｅｎ；ＭａＪｉｒｕｉ；ＺｈｅｎｇＷｅｎｚｈｅｎ；ＣｈａｉＸｉｎｍｉｎａｎｄＺｈａｎｇＱｉｎ（Ｒｅｃ...     

福建太平洋牡蛎种群微卫星DNA分析

本文采用Ucdcg153、157、202微卫星引物对福建两个太平洋牡蛎(学名为长牡蛎Crassostrea gigas)养殖种群进行扩增分析和序列测定.与采自漳浦旧镇的近江牡蛎(C. ariakensis)比较,前者对以上三种引物全部呈阳性反应,后者只对Ucdcg157显阳性.与Genebank提供的相关序列比较,福建太平洋牡蛎与Genebank样品应属同源,其中漳浦霞美和厦门白礁的样品则可能代表同一种群的两个衍生品系.本项调查结果同时显示,近亲繁殖的育苗方式已经导致福建太平洋牡蛎种群裂化;任其发展不利于维护良种优势.本次采集的样品中未发现显示葡萄牙牡蛎、熊本牡蛎和美洲牡蛎微卫星特征的个体.     

岩浆岩地区富水性分级与蓄水构造研究

在以往水文地质编图中,岩浆岩地区地下水富水性等级划分较为笼统,不利于找水定井工作。该文利用已开展的1∶5万水文地质调查工作,分析了颜庄幅、赵格庄幅相关基础数据资料,总结了地下水的富集规律,考虑地形地貌、岩性、构造等影响因素,以小流域单元为思路进行富水性划分,将岩浆岩区富水性等级划分为<10m^3/d,10~50m^3/d,50~300m^3/d,>300m^3/d 4个等级。分析了断裂型、岩脉型、不同期次岩体接触带型和复合型4种主要蓄水构造富水机理,为下一步水文地质编图及找水定井工作提供一定参考依据。     

Nonlinear response of runoff to atmospheric freezing level height variation based on hybrid prediction models

ABSTRACT

We use data on the freezing level height (FLH) and summer runoff in the Hotan River, China, from 1960 to 2013, to analyse the nonlinear relationships of atmospheric and hydrological factors at different time scales, by employing three nonlinear decomposition methods. Six hybrid prediction models are established by combining linear regression and back-propagation artificial neural network (BPANN) models. The decomposition results by three nonlinear methods are compared, indicating that the extreme-point symmetric mode decomposition (ESMD) method ensures the best prediction capacity. The runoff and FLH have periods of 3 and 6 years, respectively, at the inter-annual scale, which pass the significance test of 0.05 (P < 0.05) by using the Monte Carlo method, although there were slight differences in the periods at the inter-decadal scale. Among the six models, ESMD-BPANN exhibits the highest accuracy, with good reliability and resolution, according to several performance indicators. The ESMD-BPANN model is thus selected for the simulation and prediction of runoff.     

Tree‐ring‐based annual precipitation reconstruction for the Hexi Corridor,NW China: consequences for climate history on and beyond the mid‐latitude Asian continent

An annual (July to June) precipitation reconstruction for the period AD 1760–2010 was developed from a Picea crassifolia regional tree‐ring chronology from two sites in the northern mountainous region of the Hexi Corridor, NW China. This reconstruction explains 52.1% of the actual precipitation variance during the period 1951 to 2010. Spatial correlations with gridded land‐surface data reveal that our reconstruction contains a strong regional precipitation signal for the Hexi Corridor and for the southern margin of the Badain Jaran Desert. Significant spectral peaks were identified at 31.9, 11.1, 8.0, 7.0, 3.2, 2.6 and 2.2 years. A large‐scale comparison indicates that our reconstruction is more consistent with climate records of a Westerly‐dominated Central Asia, and that the Westerlies have a greater impact on the precipitation in this region than the Asian summer monsoon. Our reconstructed precipitation series is significantly correlated with sea‐surface temperature (SST) in the tropical Atlantic Ocean (positive), the tropical Indian Ocean (positive), the western tropical Pacific Ocean (positive), and the western North Pacific Ocean (negative). The spatial correlation patterns between our precipitation reconstruction and SSTs of the Atlantic and Pacific Oceans suggest a connection between regional precipitation variations and the high‐mid‐latitude northern atmospheric circulations (Westerlies and Asian summer monsoon).     

SPOT 5卫星遥感影像在土地利用数据库系统更新中的应用

随着国民经济的快速发展,土地现状变更十分频繁,如何保持数据库系统的现势性成为国土资源管理部门的一项重要工作。该文介绍了利用卫星遥感数据对土地利用数据库变更的系统设计、实现方法及结果,说明了利用遥感卫星数据对数据库进行更新的优势。