基于DRASTIC的山东省丘陵山区地下水防污性能评价

地下水防污性能评价是研究和预防地下水污染的一种有效途径。在分析山东省丘陵山区地质、水文地质条件的基础上,选用DRASTIC评价方法,评价了其地下水防污性能,获得了山东省丘陵山区地下水防污性能分区图,其成果可为水行政主管部门对含水层保护和水资源配置提供科学参考。     

改进土地整治技术、推进丘陵山区农业机械化

通过对丘陵山区土地整治技术与农业机械化现状的思考,分析了当前丘陵山区土地整治技术不利于推进农业机械化的一些因素,即水平梯田田面宽度确定、田间道路的平纵线型设计、机械下田与田间转移设施设置等,之后提出了有针对性的建议。     

莱芜市土地复垦现状与对策

临沂市位于山东省南部，现辖3区9县，180个乡镇、办事处，1018万人，总面积1．72万km^2，山区、丘陵、平原各占1／3，面积、人口各占山东省的1／9。临沂市把开展土地开发整理，提高农业综合生产能力作为落实土地基本国策，实现全市耕地总量动态平衡的重要措施来抓，坚持保护与开发并重，开源与节流并举，在严格控制非农建设占用耕地的同时，努力搞好土地后备资源的开发利用。开展山、水、林、     

滑坡的危害和分布

<正>滑坡(土体和岩体滑动、也包括泥石流和崩塌等)是丘陵和山区经常发生的地质灾害。在我国的大多数山区几乎每年都会发生大大小小的滑坡,在有些地方一年可以发生几次,甚至几十次。滑坡灾害的特点是:发生     

汝阳县地质灾害防治不留死角

<正>进入汛期,汝阳县政府多措并举,标本兼治,扎实做好地质灾害防治工作,"不留死角",确保地质灾害防治工作有效开展,切实保障人民群众生命财产安全。汝阳县位于豫西伏牛山区,北汝河上游,地形复杂。南部崇山峻岭连绵不断,北部为平原丘陵。全县山地面积900余平方千米,占总面积的70.2%,丘陵占总面积的19.6%,平川仅占10.2%。地貌基本上分为南部深山区、中南部浅山区、平川区和丘陵区。平川区主要在汝河等河流两岸,进入     

济宁南部优质大米产地土壤地球化学特征

对济宁南部优质大米产地的不同层位土壤样品的分析结果进行统计，分析了土壤元素的分布特征，证实除P的含量稍低于山东省平均值外，其他元素含量均高于山东省平均值，土壤质量良好，营养水平较高。但Cu，F，As，cd，Pb，Hg，cr在土壤中原始含量偏高，是潜在污染源和引发地方病的隐患。通过土壤环境质量评价和土壤肥力评价，结果表明该区土壤环境质量较好，大部分地区肥力优良或尚可，但个别地段因重金属污染超标成为质量较差区，应引起人们的重视，以确保粮食生产安全。     

平邑县DEM模型的建立及其三维可视化

平邑县境内属于丘陵山区,进行地形三维显示不仅便于用户直观地了解平邑的地形地貌,而且便于用户查询相关信息进行土地利用分析。该文主要介绍利用ArcView3.2进行数字高程模型(DEM)的建立及其三维显示,以及道路、水系等各主要要素的三维显示。     

我省对降雨引发滑坡泥石流预报研究取得重要突破

2015年3月19日,浙江省国土2资源厅科技与教育处和地质环境处组织专家对浙江省国土资源厅信息中心完成的"浙江省丘陵山区县(市、区)级区域引发滑坡(泥石流)的降雨阈值研究"成果进行了评审,评审专家委员会一致认为该项成果在同类研究中处于国际领先水平。浙江陆域面积的70%为丘陵山区,具有复杂的地质、地形和独特     

枣庄市山亭区如何进行土地利用现状更新调查

枣庄市山亭区位于枣庄市东北部，泰沂山区西南部，属低山丘陵区，全区大小山头1000多座，地形条件复杂，土地总面积1018．64km^2，山地丘陵占全区总面积的80％以上。山亭区的土地利用现状更新调查工作始于2004年，经过1年多的艰苦调查，查清了全区各类土地利用的现状，绘制了山亭区土地利用现状图，建成了山亭区土地利用数据库。2007年7月，山东省国土资源厅对山亭区的土地利用调查更新工作进行了验收。经验收，山亭区土地利用更新调查技术路线正确、方法先进，各项成果符合土地更新调查技术要求。     

浅谈丘陵山区土地整治面临的问题与对策

开展农村土地整治是为了增加有效耕地面积,实现耕地占补平衡,促进新农村经济发展的有效途径。 一、当前丘陵山区土地整治面临的问题 随着城市、农村经济发展,耕地后备资源已严重不足,特别是丘陵山区耕地资源分布零散,远离居民点,开发难度大,利用条件差,垦殖成本高,经济效益低。林地、草地和坡地开荒受限制。原有耕地中,坡耕地多,水土流失严重。耕地质量下降,地力减退,进城农民房屋闲置成废弃地,这些将给农业可持续发展带来潜在危害。针对存在的问题,积极开展农村土地整治,在增加有效耕地面积的同时实现耕地占补平衡,也是加强新农村建设的有效途径。     

临沂市与江苏省四市保障用地做法对比分析

临沂市毗邻江苏省,前者是革命老区,经济欠发达城市,后者则是全国经济发展速度最快的省份之一.经济发展形势的差异使得二者在保障用地的措施做法上产生了差别.文章以江苏省徐州市、宿迁市、南通市和扬州市为例,重点分析了经济发展较快地区化解用地矛盾的做法,并与临沂市作了比较,借以提出了可供经济欠发达地区借鉴的保障发展用地的措施建议.     

北部湾海域秋、冬季甲壳类的种类组成及分布

根据 2 0 0 1年 11至 2 0 0 2年 1月间北部湾海域秋、冬季 2个航次的底拖网渔业资源调查资料 ,对北部湾海域甲壳类的种类组成及分布进行研究。本次调查共渔获虾类 2 4种 ,隶属于 6科 11属 ;蟹类 30种 ,隶属 9科 19属 ;虾蛄 9种 ,隶属 2科 6属。各种类沿水深和地理分布有明显变化 ,主要集中分布于湾中部水深 2 1～ 80m海域。     

Mollisols properties and changes in Ukraine and China

Soils are the foundation of civilizations and the basis for human food production.Mollisols in Ukraine and Northeast China are two out of the four major Mollisol regions in the world.The natural areas from which Mollisols developed are the prairies and steppes that experience temperate and freezing conditions.This review paper introduces the general climate,vegetation,and topography of Mollisols regions in Ukraine and Northeast China,analyzes their properties,including soil texture,soil organic matter content,soil bulk density,pH,cation exchange capacity and other chemical properties,and compares the property changes and management practices of Mollisols in relation to sustainable grain production.     

Turbulence and Fossil Turbulence in Oceans and Lakes

Turbulence is defined as an eddy-like state of fluid motion where the inertial-vortex forces of the eddies are larger than any of the other forces that tend to damp the eddies out. Energy cascades of irrotational flows from large scales to small are non-turbulent, even if they supply energy to turbulence. Turbulent flows are rotational and cascade from small scales to large, with feedback. Viscous forces limit the smallest turbulent eddy size to the Kolmogorov scale. In stratified fluids, buoyancy forces limit large vertical overturns to the Ozmidov scale and convert the largest turbulent eddies into a unique class of saturated, non-propagating, internal waves, termed fossil-vorticity-turbulence. These waves have the same energy but different properties and spectral forms than the original turbulence patch. The Gibson (1980, 1986) theory of fossil turbulence applies universal similarity theories of turbulence and turbulent mixing to the vertical evolution of an isolated patch of turbulence in a stratified fluid as its growth is constrained and fossilized by buoyancy forces. Quantitative hydrodynamic-phase-diagrams (HPDs) from the theory are used to classify microstructure patches according to their hydrodynamic states. When analyzed in HPD space, previously published oceanic datasets showed their dominant microstructure patches are fossilized at large scales in all layers. Laboratory and field measurements suggested phytoplankton species with different swimming abilities adjust their growth strategies by pattern recognition of tur-bulence-fossil-turbulence dissipation and persistence times that predict survival-relevant surface layer sea changes. New data collected near a Honolulu waste-water outfall showed the small-to-large evolution of oceanic turbulence microstructure from active to fossil states, and revealed the ability of fossil-density-turbulence patches to absorb, and vertically radiate, internal wave energy, information, and enhanced turbulent-mixing-rates toward the sea surface so that the submerged waste-field could be detected from a space satellite (Bondur and Filatov, 2003).     

Spatial and temporal variations in cyanobacteria and microcystins in Aha Reservoir,Southwest China

Toxic cyanobacteria(TCB) are well-known worldwide for their adverse impacts on humans. Species compositions and seasonal variations of TCB in reservoirs depend on interactions between physical and chemical factors. This study was conducted to evaluate the water quality in the Aha Reservoir, Southwest China, focusing on cyanobacteria and cyanotoxins. Water samples were collected weekly or biweekly from May to September of 2015 and used to delineate temporal variations in density and distribution of toxic cyanobacteria and cyanotoxins in the reservoir. Toxic cyanobacteria identified consisted of Aphanizomenon flos-aquae, Pseudanabaena limnetica, Cylindrospermopsis sp., and Microcystis sp., with Aphanizomenon flos-aquae and Pseudanabaena limnetica being the most common and significant toxic genera. The total biomass of cyanobacteria was 17.0 mg/L. Identification and quantification of microcystin variants were conducted by high performance liquid chromatography(HPLC) using a system equipped with a photodiode array detector. Microcystin levels were between 0–3.0 μg/L, MC-RR was around 0–3.0 μg/L and MC-LR was approximately 0–0.9 μg/L. Overall, the results of this study indicate that the investigated reservoirs should be monitored regularly to minimize potential health risks to the human population.     

郯城县城镇变更地籍调查研究

城镇地籍调查是国土资源管理的一项重要的基础性工作,是城镇土地登记的法定程序,主要内容包括土地权属调查和地籍测量。该文分析探讨了土地权属调查政策、调查程序以及地籍测量技术的创新及应用,对城镇地籍初始和变更地籍调查具有一定的指导和借鉴作用。     

Symbiosis of Marshes and Permafrost in Da and Xiao Hinggan Mountains in Northeastern China

Recently, the degradation of permafrost and marsh environments in the Da and Xiao Hinggan Mountains has become a great concern as more human activities and pronounced climate warming were observed during the past 30 years and projected for the near future. The distr/bution patterns and development mechanisms of the permafrost and marshes have been examined both in theories and in field observations, in order to better understand the symbiosis of permafrost and marshes. The permafrost and marshes in the Da and Xiao Hinggan Mountains display discernible zonations in latitude and elevation. The marsh vegetation canopy, litter and peat soil have good thermal insulation properties for the underlying permafrost, resulting in a thermal offset of 3 ℃ to 4℃ and subsequently suppressing soil temperature. In addition, the much higher thermal conductivity of frozen and ice-rich peat in the active layer is conducive to the development or in favor of the protection of permafrost due to the semi-conductor properties of the soils overlying the permafrost. On the other hand, because permafrost is almost impervious, the osmosis of water in marsh soils can be effectively reduced, timely providing water supplies for helophytes growth or germination in spring. In the Da and Xiao Hinggan Mountains, the permafrost degradation has been accelerating due to the marked climate warming, ever increasing human activities, and the resultant eco-environmental changes. Since the permafrost and marsh environments are symbiotic and interdependent, they need to be managed or protected in a well-coordinated and integrated way.     

小城市和建制镇土地集约利用面临的挑战与对策

小城市和建制镇土地集约利用程度低 发达国家的城镇化历程表明,城镇化水平达到30％后,城镇化即驶入快车道。目前,我国城镇化水平接近40％,已进入加速发展阶段,这一过程不依人们的意志为转移,也是我国实现现代化的必经之路。同时,我国城镇化水平还     

Changes in nitrogen and phosphorus and their effects on phytoplankton in the Bohai Sea

Systematic studies of the changes in dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) and their effects on phytoplankton over the last 30 years in the Bohai Sea are presented. The amount of sewage disposal, use of fertilizer and the Huanghe River runoff were found to have a significant influence on the DIN or DIP concentrations in the Bohai Sea over the last 30 years. Moreover, the changes in DIN and DIP resulted in changes in the limiting nutrients of phytoplankton in the Bohai Sea from nitrogen in the early 1980s to nitrogen-phosphorus in the late 1980s, and then to phosphorus after the 1990s. In addition, changes in nitrogen and phosphorus had a significant effect on the phytoplankton community structure. The half saturation constant (K _s) was used to evaluate the effect of nutrients on the phytoplankton community structure in the Bohai Sea over the last 30 years. Cell abundance percentages of dominant phytoplankton species with high K _s values for phosphorus and low K _s values for nitrogen have decreased since the 1980s, while those of dominant phytoplankton species with low K _s values for phosphorus and high K _s values for nitrogen increased during this period.