长江口北岸土地利用空间结构分析

采用地统计学方法,进行长江口北岸土地利用样本点半变异函数拟合和结构性分析,研究表明:当样本点间距小于61km时,土地利用样点间的距离越小,空间相关性越大;当样本点间距大于61km时,区域化变量的空间相关性不存在.长江口北岸土地利用样本点半变异函数拟合的结构系数为0.7左右,表明长江口北岸土地利用样本间的变异更多是由随机因素引起的,土地利用样本间的空间依赖性较弱,但有增强的趋势.     

模糊神经网络在GPS高程转换中的应用

介绍了T-S模糊神经网络的基本原理以及如何确定GPS高程转换的模糊神经网络模型,并采用该模型对实测数据进行了计算分析。结果表明,模糊神经网络能够对小区域GPS高程做出比较准确定的拟合,从而能够为GPS高程转换提供一种较好的方法,能够满足实际工程需要。     

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野外型断层活动连续监测系统

介绍野外型断层活动连续监测系统的组成、布设及主要技术指标。     

Hypoxia in the East China Sea: one of the largest coastal low-oxygen areas in the world

Anoxia and hypoxia have been widely observed in estuarine and coastal regions over the past few decades; however, few reports have focused on the East China Sea (ECS). In June and August 2003, two cruises sampled at stations covering almost the entire shelf of the ECS to examine hypoxic events and their potential causes. In August, DO concentrations <2-3 mg l(-1) covered an area estimated at greater than 12,000 km(2) (or 432 km(3) volume). In contrast, water column DO concentrations exceeded 4 mg l(-1) throughout most of the shelf region. A sharp density gradient was observed under the mixed layer in August, restricting vertical re-aeration across this strong pycnocline. Oxygen depletion events, such as that described here for the ECS shelf, are fueled by decomposition of newly produced marine and river-borne biogenic substances (as well as older residual organic matter) deposited to the bottom waters.     

海带的病害

本文综述了养殖海带危害严重的主要疾病其防治方法。文章按海带夏苗培育中的病害及其防治，海上栽培期间发生的病害 及其防治的顺序分别叙述了各主要病害，尤其对危害严重的病害种类进行了较为详细的记述，以期对海带疾病的研究提供参考材料。     

南北半球副热带高压对赤道东太平洋海温变化的响应

本文利用1974年1月到1996年12月重分析(NOAANCEP-NCARCDAS-1)全球500hPa位势高度场资料,及同期赤道太平洋各海区SST资料,研究了南北半球副热带高压的变化特征及其对赤道东太平洋SST变化的响应。结果表明,全球副热带高压的变化及对SST的响应,在南北两个半球有很好的一致性。全球副热带高压强度的变化与超前3个月SST的正相关最为显着。对SST响应最强烈的区域主要在南北纬30°之间的低纬,低纬地区局地SST对副热带高压也有强烈的影响。从10°到30°纬度,对SST的响应分别落后于赤道2～9个月。在中、高纬大气环流的响应表现为波列特征,对暖SST及冷SST的响应波列基本相反,但对暖SST的响应更为显着。海温和副热带高压的月际持续性有明显的季节变化,副热带高压9-10月的相关障碍可能与NinoC区SST8-9月的相关障碍低点有关。     

海岸带可持续发展及其指标体系研究--以辽宁省海岸带部分城市为例

海岸带有着丰富的资源，能够为人类社会的可持续发展提供强大的物质基础，而它对外界的影响又是相当敏感的，因此海岸带自身的可持续发展理应受到人们的关注。本文根据可持续发展理论的基本原理，提出海岸带可持续发展的概念，阐述了海岸带可持续发展的基本内涵，并建立了其评价指标体系。文章最后以辽宁省海岸带部分城市为例，介绍了海岸带可持续发展的具体评价方法，为合理开发利用海岸带提供了依据。     

2001-2002年天目湖(沙河水库)浮游植物的生态学研究

2001年6月~2002年5月,对天目湖进行的浮游植物周年调查表明,天目湖共有浮游植物7门75属,其中年平均丰度为5026.20×104个/L,以蓝藻为主,占总丰度的54.45%;而年平均生物量为(15.364±9.103)mg/L,其中硅藻居首位,为6.634 mg/L,占浮游植物年平均生物量的43.18%;其周年变化是丰度和生物量最高值均出现在5月,丰度在5月和9月出现2个峰值,而生物量则在5、7、10月出现3个峰值。浮游植物丰度从大坝处1#点到河流入湖口的9#、10#点变化不明显但略有增加,而生物量则呈明显增加。通过对水温、透明度、营养盐与浮游植物丰度和生物量的线性回归分析发现,浮游植物丰度、生物量与水温、TP存在显著的正相关,而与N/P比、透明度存在显著性负相关,与TN相关性不是很明显。     

Pore-water geochemistry in methane-seep sediments of the Makran accretionary wedge off Pakistan: Possible link to subsurface methane hydrate

Cold seeps are pervasive along the continental margin worldwide,and are recognized as hotspots for elemental cycling pathway on Earth.In this study,analyses of pore water geochemical compositions of one-400 cm piston core(S3) and the application of a mass balance model are conducted to assess methane-associated biogeochemical reactions and uncover the relationship of methane in shallow sediment with gas hydrate reservoir at the Makran accretionary wedge off Pakistan.The results revealed that approximately 77% of sulfate is consumed by the predominant biogeochemical process of anaerobic oxidation of methane.However,the estimated sulfate-methane interface depth is-400 cm below sea floor with the methane diffusive flux of 0.039 mol/(m~2·a),suggesting the activity of methane seepage.Based on the δ~(13)C_(DIC) mass balance model combined with the contribution proportion of different dissolved inorganic carbon sources,this study calculated the δ~(13)C of the exogenous methane to be-57.9‰,indicating that the exogenous methane may be a mixture source,including thermogenic and biogenic methane.The study of pore water geochemistry at Makran accretionary wedge off Pakistan may have considerable implications for understanding the specific details on the dynamics of methane in cold seeps and provide important evidence for the potential occurrence of subsurface gas hydrate in this area.