Development Mode of Mid-small Cities in Northern Jiangsu Based on the Growth Pole Theory

The development mode of mid-small cities in northern Jiangsu is analyzed on the Growth Pole theory.Depending on scales,endowment of resources,geographical positions,and industrial advantages of mil-small cities,we can divide the development mode of those mid-small cities within this context into five types:development through integration into big cities;independent development;resource-dependent development;single industry development;and mixed industry development.

Modern changes of tidal troughs among the radial sand ridges in northern Jiangsu coastal zone

Using satellite images taken on different dates,GIS analysis of aerial photos,bathymetric maps and other field survey data,tidal troughs and major sand ridges in the northern Jiangsu coastal area were contrasted.The results show that there have been three types of movement or migration of tidal trough in this area:(1) Periodic and restricted,this type of trough usually developed along the beaches with immobile gully head as a result of the artificial dams and the swing range increased from gully head to the low reaches,so they have been obviously impacted by human activity and have longer swing periods;(2) Periodic and actively,this kind of trough,which swung with a fast rate and moved periodically on sand ridges,were mainly controlled by the swings of the host tidal troughs and hydrodynamic forces upon tidal sand ridge and influenced slightly by human constructions;(3) Steadily and slowly,they are the main tidal troughs with large scale and a steady orientation in this area and have slow lateral movement.The differences in migration mode of tidal trough shift result in different rates of migration and impact upon tidal sand ridges.Lateral accumulation on current tidal trough and deposition on abandoned tidal troughs are the two types of sedimentation of the tidal sand ridges formation.The whole radial sand ridge was generally prone to division and retreat although sand ridges fluctuated by the analysis of changes in talwegs of tidal troughs and shorelines of sand ridges.

Formation Laws of Inorganic Gas Pools in the Northern Jiangsu Basin

In the Northern Jiangsu basin there are high pure CO2 gas pools, low condensed oil-containing CO2 gas pools, high condensed oil-containing CO2 gas pools and He-containing natural gas pools, with the δ13Cco2 (PDB) values ranging from ?2.87%o to ?6.50%o, 3He/4He 3.71 × 10?6 to 6.42 × 10?6, R/Ra 2.64 to 4.5, 40Ar/36Ar 705 to 734, belonging to typical mantle source inorganic gas pools which are related to young magmatic activity. The gas layers occur in two major reservoir-caprock systems, the terrestrial Meso-Cenozoic clastic rock system and the marine Meso-Palaeozoic carbonate rock-clastic rock system. Controlled by the difference in the scale of traps in the two reservoir-caprock systems, large and medium-scale inorganic gas pools are formed in the marine Meso-Palaeozoic Group and only small ones are formed in the terrestrial Meso-Cenozoic strata. Inorganic gas pools in this basin are distributed along the two deep lithospheric faults on the west and south boundaries of the basin. Gas pools are developed at the intersected part of the ENE-trending faults that control the half graben and the E-W tenso-shear faults, mainly distributed near the Es1, Ny1 and Ny2-Q basalt eruption centres.

Analysis on Peasants' Diet Condition and Food Safety Awareness in Northern Jiangsu——From the Perspective of Economics

Taking three counties in northern Jiangsu (Suining,Ganyu and Sihong) as the respondents,the economic principles of food safety issues of rural areas in northern Jiangsu are described from three aspects which are information asymmetry,food supply and food safety issue and food consumption and food safety issue.From the two aspects-adverse selection of consumers and opportunistic behavior of producers,the paper introduces the influence of food safety issues of rural areas in northern Jiangsu.Based on the above analysis,economic theories for solving food safety issues of rural areas in northern Jiangsu are put forward:First,improve consumers' knowledge of food safety;Second,normalize the behavior of main bodies of production and management;Third,improve the current situation of information asymmetry of food safety;Fourth,accelerate economic construction of rural areas in northern Jiangsu,practically increase peasant income and living standard.

Gap between Urban and Rural Economic Development in Less Developed Areas——A Case of Northern Jiangsu Area,China

Taking northern Jiangsu area as an example,economic disparity between urban and rural areas is described according to the data in 2000-2009 Jiangsu Statistical Yearbook.Result shows that there are significant differences in the rural and urban economic development in less developed areas,which are mainly reflected in the differences in per capita income,living standard,and Engel coefficient.Reasons for urban and rural economic disparity in less developed areas are analyzed.The asymmetry and immobility of rural and urban resources have objectively caused the income gap between urban and rural residents;urban industrial development,which is faster than agricultural development,has widened the income gap between urban and rural residents;and the differences in comparative labor productivity in rural and urban areas have enlarged their income gap.Countermeasures to minimize the urban and rural economic development gap are put forward,such as deepening the reform,realizing the free flow of economic resources between urban and rural areas,developing rural areas through urban development,exerting the function of urban areas in the coordinated development of urban and rural areas,paying attention to the agriculture and rural areas,and improving the comparative labor productivity of agriculture.

Spatial and Temporal Distribution of Metal Elements in the Rivers of Northern Jiangsu Province

The concentrations of V,Cr,Mn,Fe,Co,Ni,Cu,Zn,As,Mo,Cd,and Pb were determined in Doulonggang River,Xinyanggang River,Huangshagang River,Sheyanghe River,Guangaizongqu River,and Linhonghe River at the North of Jiangsu Province in 2019.The annual average concentrations of V,Cr,Mn,Fe,Co,Ni,Cu,Zn,As,Mo,Cd and Pb in the six rivers were 2.20,1.22,4.53,21.9,0.13,2.79,1.77,4.00,2.97,3.87,0.01,0.19μg L^(-1)respectively.The highest concentration of most trace metals were found in Guangaizongqu River and Linhonghe River,and the lowest concentration were found in Xinyanggang River and Huangshagang River.The principal component analysis(PCA)resulted of two factors together explained 91.2%of the variance with>1initial eigenvalue,indicating that both natural and anthropogenic activities were contributing factors as the source of metal abundance in rivers of northern Jiangsu Province.The first major component represented the influence of anthropogenic activities,including industry and agriculture,with a contribution rate of 54.1%,affected Cr,Fe,Cu,Zn,Mo,Cd and Pb.The second(such as V,Mn,Co,Ni,As)was a mixed source,including the natural processes such as precipitation,erosion and weathering and anthropogenic action like industry and agriculture,with a contribution rate of 37.1%.Seasonal variations in trace metal concentrations were influenced by temperature,salinity,water discharge,and input of external pollutants.The highest concentrations were found in wet season and were strongly influenced by rainfall and seasonal industrial and agricultural activities.

Coastal evolution of Yancheng, northern Jiangsu, China since the mid-Holocene based on the Landsat MSS imagery

Since the 1970s, remote sensing images have provided new information for the delineation and analysis of coastline changes, especially focusing on the short timescale changes. This paper, based on the Landsat MSS imagery, focuses on the coastline evolution of Yancheng, northern Jiangsu, China since the mid-Holocene. A zebra stripe image, which could reveal the ancient coastal evolution of Yancheng, was extracted from a Landsat MSS image. Based on the extracted black-white stripes, 19 surface sediment samples were recovered and analyzed to recognize the sedimentary characteristics of these stripes. It shows that most sand and silty sand samples appear on the white stripes, while silt and silty clay samples are on the black stripes. Sandy and muddy sediments present an alternating distri- bution pattern on the Yancheng coastal plain. A historical coastline map was drawn according to the previous research achievements of the paleo-coastal sand barriers and paleo-coastlines, and was superimposed on the zebra stripe image. The trend of the extracted zebra stripes is consistent with the historical coastlines, and it should be the symbol of the Yancheng coastline evolution. On the basis of ten sets of black-white stripes and previous research results, we divided the progression of Yancheng coastal evolution into three stages （i.e., the early stable stage （6500 a BP-AD 1128）, the rapid deposition stage （AD 1128-1855） and the adjustment stage （AD 1855-present））. Ten sets of black-white stripes were identified as the characteristic pattern of the coastline evolution on the Yancheng coastal plain.

苏北不同林龄杨树人工林碳储量时空分配格局

[目的]探讨不同林龄对苏北杨树人工林生产力形成及林分碳储量地上、地下空间分配格局的影响及机理,为提高杨树人工林生态系统碳汇功能以及为杨树人工林经营和管理等提供科学依据。[方法]基于江苏省宿迁市泗洪林场,选取10个不同林龄分别为2,5,6,7,8,10,14,16,17,26 a生,林分密度为6 m×6 m的杨树人工林作为试验调查样地。分析了杨树人工林乔木层、草本层及土壤层碳储量净积累随林龄的变化规律及杨树人工林不同层次碳储量变化与土壤理化性质的相关关系。[结果](1)乔木层碳储量在林分发展过程中呈现快速净积累特征,拟合其年平均积累速率、连年积累速率两条曲线,表明杨树人工林最佳轮伐期为15~20 a;(2)土壤有机碳在林分发展过程中呈现出缓慢的净积累,林下草本层碳储量随林分发展呈降低趋势;(3)杨树人工林土壤层和乔木层碳储量与土壤中SOC,TN,NO_(3)^(-)-N,N/P呈显著正相关,与AP,C/N,pH呈负相关。[结论]在杨树人工林生长过程中施N肥以及在土壤固碳水平最佳时期15~20 a进行轮作,有助于林分碳储量增加。

区域协调发展视域下苏北地区旅游产业发展探究

推动区域协调发展是中国全面建设社会主义现代化强国道路上的重要基石。江苏省作为全国经济的领头羊,省内存在苏北、苏南地区经济发展差距较大的问题,是区域发展不协调的典型案例。苏北地区拥有丰富的自然人文资源,具备发展旅游业的天然优势。在此背景下,本文基于苏北地区发展现状,深入分析居民收入、产业结构、旅游景区布局对苏北旅游发展的制约作用。认为,要通过加大金融支持力度、推动产业融合发展、加强消费引导、优化旅游发展布局来推动苏北旅游业发展,从而带动苏北经济发展,促进江苏省区域协调发展。

基于推拉理论的苏北大学生返乡就业意愿影响因素分析

切实发挥好人才在乡村振兴战略实施中的作用,是我国全面推进中国式现代化新实践的应然选择,如何更好地引导农村大学生返乡就业、投身三农已成为社会各界广泛热议的话题。以苏北地区大学生为研究对象,运用推拉理论对其返乡就业意愿及影响因素进行问卷调研与实证分析。研究结果显示,苏北地区对于乡村振兴的宣传力度不够,学校职业规划教育不足,家庭支持力度不大,个人就业择业观念尚未转变。政府加大政策宣传力度,学校加强对毕业生就业观的教育引导,家庭理性看待大学生返乡就业,以及学生自身合理规划职业生涯是促进大学生返乡就业、增强返乡就业意识的有效路径。

大运河苏北段非物质文化遗产数字化保护与传承现状——以宿迁市为例

数字化浪潮席卷全球,带动了全球产业的数字化转型。如何借力数字技术更好地实现非物质文化遗产的保护与传承成为学界热议的话题。为了更加深入地了解大运河苏北段非物质文化遗产数字化保护与传承现状,文章将研究对象聚焦于宿迁市,运用实地调研、人物访谈等方法,详细梳理了宿迁市非物质文化遗产数字化保护的现状。总体而言,大运河苏北段非物质文化遗产的数字化保护与传承尚处于起步阶段,存在工作机制不健全、专项保护资金缺乏、数字化传播手段单一等问题。

耕地利用系统脆弱性诊断与影响因素识别——以江苏北部地区为例

研究目的:基于Vulnerability Scoping Diagram(VSD)框架测算江苏北部地区耕地利用系统脆弱性,揭示其时空演变规律与影响因素,差异化提出分区降“脆”策略。研究方法:CRITIC法、综合指数法、空间自相关分析、障碍度模型。研究结果:(1)2000—2020年,江苏北部地区耕地利用系统暴露度和敏感性在时间上呈增长态势,适应能力呈先降后升;暴露度在空间上由“整体偏低、零星较高”转为“中部高,东西低”,敏感性维持“西高东低”格局,适应能力由“北高南低”转变“西北—东南沿线高、沿线两侧低”。(2)耕地利用系统脆弱性呈“先升后降”趋势,空间上由“普遍偏低,零星偏高”转为“西高东低”,研究时段内存在区域脆弱性向周边县域辐射与溢出现象。(3)暴露度主要障碍因子由城镇化率转变为化肥施用强度和人口密度;敏感性主要障碍因子始终为耕地复种指数和耕地破碎度;适应能力主要障碍因子由粮食单产和交通可达性转为交通可达性、农业总产值和农业机械化水平。适应能力制约是脆弱性形成的主要制约模式。研究结论:尽管耕地利用系统脆弱性是暴露度、敏感性和适应能力共同作用的结果,但起决定性作用的是适应能力。“提质降脆”需强化耕地资源基底建设,协同降低暴露度与敏感性;加大耕地系统修复,推进基础要素建设;补齐耕地结构短板,巩固系统抵御机制。

基于ENVI+HEC-RAS的苏北运河生态修复方法及改善效果研究

鉴于生态修复对维持河流健康生命十分重要,以提升植被覆盖度与水质为目标,对苏北运河进行生态修复。基于2018年研究区Landsat8遥感影像数据,运用ENVI软件对苏北运河全河段的土地利用情况进行处理分析,并在增加上游生态来水的情况下,使用HEC-RAS软件对泗阳新一水厂断面的COD水质指标浓度进行模拟。结果表明,苏北运河全河段植物覆盖度最大可提升至59.84%,且Kappa系数结果均大于0.6,精度符合要求;COD水质指标浓度在5、10、12月达到Ⅱ类水标准,其余月份较调控前均已达到Ⅲ类水标准,可见在增大生态来水作用下,运河水质得到提升。

苏北地区数字经济发展测度与驱动因素研究

数字经济的兴起使传统产业得以借助互联网、大数据和人工智能等技术工具,实现生产、流通、消费等环节的数字化、网络化和智能化。通过数字化转型,传统产业能够更高效地整合资源,提升生产效率,降低成本,提供更为个性化的产品和服务。本文选取2013—2022年苏北地区五个地级市的平衡面板数据,旨在测度这些城市数字经济的发展水平,并通过实证分析确定推动苏北地区数字经济发展的关键因素。结果显示,苏北地区五个地级市的数字经济发展水平差异较小;金融发展水平和产业升级水平是推动数字经济发展的主要因素。据此,本文提出了相应建议,以供参考。

苏北地区科技创新与经济高质量发展耦合协调度研究

科技创新为经济发展注入能量,经济发展促进科技创新,二者相辅相成、相互促进.尽管我国在科技创新领域不断探索,但科技创新和经济高质量发展两个系统不平衡、不协调地问题仍旧存在.为进一步明晰我国苏北地区科技创新与经济高质量发展耦合协调发展情况,在借鉴国内外相关研究的基础上,从科技创新和经济高质量发展两个子系统出发分别构建评价指标体系,采用熵权法和模糊综合评断方法测度分析了2012-2021年苏北地区的科技创新和经济高质量发展状况;采用耦合协调度模型统合两个子系统,评价分析了2012-2021年苏北地区科技创新与经济高质量发展的耦合协调发展水平、类型及其时空演化特征.研究发现:2012—2021年,苏北地区科技创新和经济高质量发展水平呈持续波动上升趋势,科技创新有较大的发展空间;两者的耦合协调发展水平较低,但处于持续增长状态;苏北五市科技创新与经济高质量发展耦合协调发展类型基本是由失调类型提升为协调类型,但均未达到良好协调和优质协调类型;苏北地区科技创新和经济高质量发展耦合协调度在空间上表现为“东西高、中部低”格局.基于以上研究,提出了因地制宜、实施创新发展战略,强化基础、提升科技创新水平,创新融合、促进产业经济发展的建议,以期进一步促进苏北地区科技创新与经济的高质量协调发展.

苏北沿海潜在震源区调整对地震危险性评估影响

江苏持续开展地震危险源探查,苏北沿海地区潜在震源区发生较大调整,从而对该区域的地震灾害风险评估、重大工程抗震设防要求等产生直接影响。为评估潜在震源区调整给苏北沿海地区地震危险性造成的影响,采用常规地震危险性概率分析方法,从基岩峰值加速度、场地基岩反应谱、平均场地条件下基本地震动参数分区等方面进行分析研究,研究结果表明:潜源变化区域峰值加速度值有显著增加,沿剖面最大增幅达到27%,主要有盐城潜源、东台潜源、海安潜源;各调整潜源对峰值加速度值贡献均有较大幅度的增加,呈主要贡献;而长周期部分的潜源贡献主要来自于附近高震级瑶沙潜源,没有发生显著变化;与第五代地震动参数区划图分区相比,平均场地条件下基本地震动参数分区在苏北沿海盐城地区有较大变化,主要盐城城区由原0.10 g调整到0.15 g,建湖城区由0.05 g调整到0.10 g,其余变化较小。

江苏新沂城岗石墨矿地质特征及找矿标志

城岗石墨矿位于华北板块东南缘,处在郯庐断裂带之间。城岗石墨矿赋存于新太古代—古元古代城岗岩群中部,呈层状、似层状产出,矿体规模较大。矿石自然类型为片麻岩型石墨矿,矿石质量良好。矿床成因为区域变质型石墨矿,系含有机质的钙质碎屑岩及碳酸盐岩经后期区域变质作用形成。城岗石墨矿找矿标志较明显,与石墨矿化密切相关的岩性主要为含石墨透辉(或透闪)斜长片麻岩、透辉斜长片麻岩、大理岩等。

合理增施有机肥减施化肥对新沂水蜜桃生产的影响

为筛选出适宜新沂地区水蜜桃的最佳有机肥替代化肥比例,研究商品有机肥45 t/hm^(2)施用量下分别减施10%、20%、30%和40%化肥的应用效果,并对水蜜桃的产量和品质进行测定,分析有机肥替代的经济效益和肥料农学效率。结果表明,增施有机肥并减施10%和20%化肥虽然成本较增施有机肥并减施30%和40%高,但产量增加较多,经济效益有所增加,总体经济效益和肥料农学效率提高。有机肥替代化肥均可改善果实品质,可潜在提高经济效益。有机肥替代化肥处理均增加了肥料农学效率,增施有机肥并减施10%和20%化肥对肥料利用效率最佳。

苏北平原区河流生态水位阈值计算方法适用性研究

针对平原区多数河流缺乏有效的流量资料的情况,研究适用于平原区河流生态水量阈值的计算方法具有重要现实意义。本文对比分析7Q10法、保证率法、湿周法、基于Tennant改进的生态水位法等4种代表性生态水量计算方法与结果,以水文节律、生态水位满足度为判别原则,评价了上述方法的适用性。分析结果显示:(1)在水文节律相应性方面,7Q10法、Q90法、湿周法计算的生态水位值为单一的特定值,无法反映水文节律的天然变化过程;(2)在生态满足度方面,7Q10法的多年平均生态水位的满足度最小;(3)基于Tennant法改进的生态水位法的水文节律模拟效果最好、生态水位满足度最高。研究表明:在选择的4种计算方法中,相较于7Q10法、Q90法及湿周法,基于Tennant法改进的生态水位法能较好地满足水文节律相应性和生态水位满足度原则,对平原区河流生态水位(阈值)计算具有一定的适用性。该研究成果可为苏北平原河网区流量资料缺乏型河流生态需水的确定和管理提供有益的参考。

苏北盆地地层岩石特性及井壁坍塌周期研究

苏北盆地高邮凹陷花庄地区激活大量页岩油资源量,但页岩容易发生水化造成岩石强度降低引起井壁坍塌等复杂情况,从而需要确定该区块的井壁坍塌周期。以花庄区块阜宁组岩石为研究对象,系统开展了岩石微观结构、地层强度特性、吸水规律等研究,在实验研究的基础上建立坍塌压力预测模型,以此模型建立了本区块X井的安全密度窗口,分析了井斜角和方位角对该窗口的影响以及井壁坍塌周期。研究结果表明:①花庄地区阜宁组岩石整体结构较疏松,地层富含黏土矿物、石英和方解石等矿物元素,脆性矿物含量较高,总含量31.8%~43.8%,发育有方解石充填的张裂缝,黏土矿物以伊蒙混层和伊利石为主,伊蒙混层含量较高,水化膨胀性能较高。②在一定井斜角下,当方位角从最大水平主地应力方位向最小水平主地应力方位变化时,地层破裂压力逐渐增大,坍塌压力逐渐减小,安全密度窗口逐渐变大,当定向井的方位与最小水平主地应力的方位一致时,不易发生坍塌和井漏,钻井风险最小。③根据本文建立的坍塌压力预测模型计算,推荐阜宁组钻进时采用1.5 g/cm^(3)的复合有机盐聚合物钻井液,坍塌周期约51 d。本文研究成果对于研究地层安全密度窗口及井眼坍塌周期具有重要的指导意义。