Distribution characteristics of historical earthquake classes in Jiangsu Province and South Huanghai Sea region

According to the analysis on the characteristics of historic earthquakes in Jiangsu Province and South Huanghai Sea region, the historical earthquakes in the studied area are divided into two kinds of comparatively safe class and comparatively dangerous class. Then the statistical result of earthquake class, the characteristics of geo-graphical distribution and geological structures are studied. The study shows: a) In Jiangsu Province and South Huanghai Sea region, the majority of historical strong earthquakes belong to comparatively safe class, only 13.8% belong to comparatively dangerous class; b) Most historical earthquakes belong to comparatively safe class in the land area of Jiangsu, eastern sea area of Yangtze River mouth and northern depression of South Huanghai Sea region. However, along the coast of middle Jiangsu Province and in the sea area of South Huanghai Sea, the distribution of historical earthquake classes is complex and the earthquake series of comparatively dan-gerous class and comparatively safe class are equivalent in number; c) In the studied area, the statistical results of historical earthquake classes and the characteristics of spatial distribution accord very well with the real case of present-day earthquake series. It shows that the seismic activity in the region has the characteristic of succession, and the result from this study can be used as a reference for early postseismic judgment in the earthquake emer-gency work in Jiangsu Province.

Distribution characteristics of historical earthquake classes in Jiangsu Province and South Huanghai Sea region

According to the analysis on the characteristics of historic earthquakes in Jiangsu Province and South Huanghai Sea region, the historical earthquakes in the studied area are divided into two kinds of comparatively safe class and comparatively dangerous class. Then the statistical result of earthquake class, the characteristics of geo-graphical distribution and geological structures are studied. The study shows: a) In Jiangsu Province and South Huanghai Sea region, the majority of historical strong earthquakes belong to comparatively safe class, only 13.8% belong to comparatively dangerous class; b) Most historical earthquakes belong to comparatively safe class in the land area of Jiangsu, eastern sea area of Yangtze River mouth and northern depression of South Huanghai Sea region. However, along the coast of middle Jiangsu Province and in the sea area of South Huanghai Sea, the distribution of historical earthquake classes is complex and the earthquake series of comparatively dan-gerous class and comparatively safe class are equivalent in number; c) In the studied area, the statistical results of historical earthquake classes and the characteristics of spatial distribution accord very well with the real case of present-day earthquake series. It shows that the seismic activity in the region has the characteristic of succession, and the result from this study can be used as a reference for early postseismic judgment in the earthquake emer-gency work in Jiangsu Province.

苏南经济快速发展区土壤重金属含量的空间变化研究

文章以经济快速发展的江苏省昆山市为研究区,研究了该区土壤重金属含量的空间变化。结果表明:土壤重金属平均污染指数大于1的有镍、锌、汞,其中汞的污染指数最大,是主要污染物。土壤重金属复合污染严重,综合污染指数达1.52,变异系数以汞、镉、铅、铜较大。不同功能区土壤重金属元素全量综合污染指数按以下顺序递降:化工区(1.84)>养殖区(1.54)>大棚菜地区(1.22)>印染造纸区(0.99)。不同地貌区土壤重金属元素全量综合污染指数按以下顺序递降:中部平原区(1.71)>北部洼区(1.57)>南部湖荡区(0.99)。测定的剖面样品中各重金属元素在剖面上一般都有表聚、亚表聚特征,总体上是上层含量高于下层,增加了环境风险。

苏南经济快速发展区土壤Cu、Ni、Pb、Zn形态及其有效性定量分析——以昆山市为例

研究了江苏省昆山市农田土壤有效态Cu、Ni、Pb、Zn各形态含量及其有效性。结果表明,土壤重金属Cu、Ni、Pb、Zn各形态含量以残渣态>有机质结合态>铁锰氧化物结合态>碳酸盐结合态、可交换态,残渣态含量明显高于其他形态。Cu和Pb有机质结合态所占比例相对也较高,分别达36.09%和28.30%。土壤可交换态含量、碳酸盐结合态含量、Fe-Mn氧化物结合态含量及残渣态含量均以Zn最高;土壤有机质结合态含量以Cu最高;土壤可交换态含量变异系数、土壤碳酸盐结合态含量变异系数及土壤Fe-Mn氧化物结合态含量变异系数以Ni为最大;土壤有机质结合态含量变异系数以Zn最大;土壤残渣态含量变异系数以Pb最大。土壤铁锰氧化物结合态铜和可交换态铜对土壤有效态铜含量影响最大;土壤可交换态镍含量对土壤有效态镍含量最大;土壤铁锰氧化物结合态铅和有机质结合态铅对土壤有效态铅含量影响最大;土壤可交换态锌和碳酸盐结合态锌对土壤有效态锌含量影响最大。

苏南水网地区农田钾素资源概况及潜力

苏南水网地区,土壤供钾潜力较低,加之复种指数较高,雨水过多,土壤钾素匮缺严重,其中因径流和渗漏损失的钾素养分占钾肥施入量的54.4%。而我国钾矿资源贫乏,钾肥的生产量还不到需要量的1/10,随着作物产量的提高和农产品品质的改善,作物的需钾量将逐渐增大,因此,单纯依靠钾肥来满足作物对钾素日益增长的需要是远远不够的,迫切需要开发利用富钾资源以缓解钾素的供需矛盾。苏南水网地区的水资源、秸秆、绿肥、塘泥等均为丰富的钾素资源,其中平原地区通过水分循环可补充14.5kg/hm2的钾素;秸秆若以2250kg/hm2的数量归还,则稻秆、麦秆和油菜秆钾素的归还量分别达45kg/hm2、31.4kg/hm2和26.1kg/hm2;水网地区还具有丰富的水生绿肥资源,这些水生绿肥具有较强的吸收和富集水域钾素的能力,若能对其进行充分合理的开发利用,不但使农田流失到水域的钾素及其它养分重新回归农田,而且还可以对富营养水体进行生物修复,达到净化水域的目的;另外,水网地区水网纵横,河泥、湖泥、塘泥等钾素贮量丰富。本文通过对钾素资源的利用现状及其潜力进行分析,找出钾素资源利用中存在的问题及其相应的对策,为缓解钾素供需矛盾、促进农业持续稳定的发展提供依据。

江苏省中北部区域发展战略研究——兼论江苏省的南北差异

不平衡战略的实施使江苏的南北差异迅速扩大，苏北发展严重滞后，本文首先分析了江苏省南北区域差异的特征和成因；在透视国内外产业结构演进趋势的基础上，论证了苏中苏北的相对优势；最后，提出了苏中苏北区域发展的若干战略。

论苏南经济发展模式与吴文化之关系

"苏南模式"的形成和演变与吴文化的影响具有直接关系。吴文化自身的优势和局限成为促进和制约苏南经济社会发展的文化动因。充分发挥文化对地区经济的支撑力,促进地域文化与区域经济的良性互动无疑颇具现实意义。

信息化中的区域问题:对苏南的实证分析

信息化进程中的区域问题是信息经济学研究中不可忽视的重要课题。中国的信息化建设既要整体推进,又要区域重点突破。根据这一设想,本文对全国经济发达地区之一的苏南信息化问题进行了较全面的分析。文章总结论述了苏南在全国率先实现信息化的优势条件、苏南率先实现信息化的外在压力与内在动力,并对苏南实现信息化的指导思想、战略模式等问题进行了深入的分析。文章最后研究了苏南信息产业布局中的相关问题。

南北朝扬、徐等州的行政区划与“苏北落后于苏南”的历史成因

与东晋十六国时期相比,南北朝的对峙争战态势实已发生根本性转折,由大致上相持平衡逐渐变为南弱北强,双方在边界东段亦即今属江苏地域的扬、徐等州发生多次大规模激烈的争战,导致行政区划和建置变动频繁,十分紊乱。本文尝试分三个阶段对此进行复原,同时也对"苏北落后于苏南"现象的历史成因问题重新进行探讨。

宁苏锡常经济增长因素实证分析

采用经济增长理论中著名的"柯布—道格拉斯生产函数模型",通过1994—2003南京、苏州、无锡、常州的GDP、从业人员、固定资产投资增长数据构建回归方程,并在比对全国同期发展状况的基础上,对经济增长的三因素(人力投资、资本投资、技术进步)的贡献率进行了实证分析,最后提出实现经济集约型增长的初步建议。

苏南地区地热资源研究

在充分收集区域地质、水文地质、物化探及地热资料的基础上，分析了苏南地区地下热水的形成和赋存的背景、条件、规律及特征，并进行地下热水的划分与预测，为进一步的研究、勘探、开发提供了依据。

施用肥料添加剂对太湖地区水稻产量、氮素吸收利用及氮平衡的影响

通过田间试验研究三个供氮水平下(施氮50 kg/hm2、150 kg/hm2、250 kg/hm2)施用肥料添加剂对苏南太湖地区水稻产量、氮素吸收利用及土壤氮平衡的影响。结果表明,施氮和肥料添加剂对水稻产量、氮肥吸收利用及表观损失氮均有显著影响,但只有在水稻产量和氮肥农学利用率指标上二者表现出显著的交互作用(P<0.05);随施氮量增加,水稻产量、累积吸氮量、土壤残留无机氮(Nmin)、表观损失氮增加,氮肥吸收利用率和农学利用率降低;与单施尿素相比,尿素配施肥料添加剂可进一步增加水稻产量、累积吸氮量,并能提升氮肥利用率和降低表观损失氮量,且该效应总体上随施氮量增加而愈趋明显;施用肥料添加剂对水稻营养生长期的氮素积累影响要明显强于生殖生长期。在本研究条件下,综合分析水稻产量、氮肥利用及氮平衡指标,不施用肥料添加剂时,施氮150 kg/hm2可获得较好的农学和环境效应。