6种陕北适生豆科植物生长对原油污染土壤的响应

为筛选优良的石油污染土壤修复植物,选取陕北适生的6种豆科乡土植物,对不同浓度原油污染土壤中植物的生长差异进行研究.采用混油法盆栽试验,分设0、5 000、10 000、20 000、40 000 mg·kg-1共5个不同的原油污染浓度,分析其对土壤理化性质的改变,对植物出芽时间、出芽率、株高、植物干重、叶绿素含量和枯萎率的影响.结果表明,原油污染显著改变土壤理化性质.5 000 mg·kg-1低浓度原油污染,对受试植物的发芽率和植物株高有促进作用,后随原油浓度加大植物生长受到明显抑制.原油污染浓度低时草本植物耐受力较强,其中紫花苜蓿(Medicago sativa)在出芽时间、出芽率、株高及枯萎率等方面综合表现较优.从40 000 mg·kg-1浓度时枯萎率及叶绿素含量分析,刺槐(Robinia pseudoacacia)表现较高的耐受力.相关分析表明,原油污染浓度与植物出芽时间、出芽率、株高、干重均呈显著负相关,但与叶绿素含量呈极显著正相关.     

浙江省危险废物和污泥处置现状及加强全过程监管工作的探讨

随着近几年经济发展水平的提高,浙江省的危险废物和污泥产生量呈不断增长趋势,它们的产生、贮存、转运和处置过程中的监管压力也逐年增大。总结了浙江省的危险废物产生现状,分析了存在的主要问题,对比了发达国家的相关管理经验,提出了进一步完善浙江省危险废物和污泥全过程监管工作的建议。     

浙江省沿海地区农村房屋抗风情况调研

对浙江省沿海地区的农村房屋抗风情况进行了调研,总结了被破坏房屋的主要结构特点。在对现有房屋的统计中发现相对不富裕地区高达60%以上的房屋属于抗风能力差和较差的,而一些比较富裕且受过台风袭击有过惨痛教训地区的房屋抗风能力差和较差的仅在20%以下。进一步研究发现抗风能力较好的房屋大都是建造年代不久,多为混凝土现浇板屋盖,上部多为框架或砖混结构,而抗风能力较差和差的大都为建造年代已久,多为小青瓦屋面,上部结构多为砖木结构或构造措施较差的砖混结构。同时对当地村民传统的"砖头压瓦"防护措施进行理论验算,得出当风速超过台风界限风速时,屋面上的砖头将会飞起,该措施应该避免。     

我国北方稻区稻飞虱的成灾机制：一个假说

本文通过对大量文献资料的综合分析，从飞虱的飞行特性和北迁运载气流入手，以东亚大气低层环流为背景审视飞虱在有限时间内远迁北方致灾的成因机制，提出了以北上低空急流的时空变化与南方大发生虫源迁出期（区）相吻合、其前沿所至与北方迁入区相一致作为北方稻虱成灾的启动因子的假说．并提出了验证该假说的研究方法和技术路线，为揭示北方稻虱成灾的奥秘，完善灾变监测技术和预警系统奠定了基础。     

Ecological approach to resource survey and planning for environmentally significant Areas: The ABC method

A resource survey and planning method for parks, reserves, and other environmentally significant areas (ESAs) is presented in the context of a holistic balanced approach to land use and environmental management. This method provides a framework for the acquisition, analysis, presentation, and application of diverse ecological data pertinent to land use planning and resource management within ESAs. Through the independent analysis and subsequent integration of abiotic, biotic, and cultural or ABC information, land areas within an ESA are identified in terms of their relative environmental significance and environmental constraints. The former term encompasses wildlife, historic, and other resource values, while the latter term reflects biophysical hazards and sensitivities, and land use conflicts. The method thus calls for a matching of an ESA's distinctive attributes with appropriate land use and institutional arrancements through an analysis of available acts, regulations, agencies, and other conservation and land use management mechanisms. The method culminates with a management proposal showing proposed park or reserve allocations, buffer areas, or other land use controls aimed at preserving an ESA's special ecological qualities, while providing for resource development. The authors suggest that all resource management decisions affecting ESA's should be governed by a philosophical stance that recognizes a spectrum of broad land use types, ranging from preservation to extractive use and rehabilitation.     

NUMERICAL MODELING OF SALTWATER INTRUSION IN THE NORTHERN GUAM LENS1

ABSTRACT This paper deals with the application of a two-dimensional, saltwater intrusion model to the aquifer in Northern Guam. The model used finite element theory and the Galerkin, weighted-residual technique as its basis. The Northern Guam lens was discretized into 299 linear, triangular elements and 189 nodes. The model was calibrated using 1978 hydrologic data. The output of the model was compared with measured water levels in six observation wells. The calibrated values of permeability and porosity were then used to verify the model using 1979 data. A calibrated and verified model can be used to make an infinite variety of management and planning studies. In this study, three applications are provided that would be considered typical management runs. Steady state runs were made to compare the four conditions of no pumping, 1978 pumping levels, twice 1978 pumping levels, and five times 1978 pumping levels. The water levels due to these conditions are shown in plan and in cross sections of the aquifer. The effect of zero recharge to the aquifer is next demonstrated for the pumping levels existing during 1978. The final run shows how long the aquifer takes to reach steady state when the pumping rate is increased from the 1978 pumping level to twice that value. The program can be used for numerous other studies for management and planning purposes.     

"开放型"区域资源策略探析--以浙江省为例

本文从区域资源安全的内涵出发,以浙江省为研究对象,在分析了省域资源条件及供给现状的基础上,提出了构建“开放型”区域资源安全体系的总体思路。     

“绿水青山就是金山银山”的浙江实践与转化路径

"两山"理论,即"绿水青山就是金山银山",是习近平新时代中国特色社会主义思想的重要内容。浙江是"两山"理论的发源地,思考探寻基于浙江情境的"两山"转化路径,意义重大且十分迫切。本研究从顶层设计、高质量发展、营商环境、协同治理、技术创新等方面,总结浙江"两山"转化的实践经验及其实践特征,探讨其"两山"转化路径,以期为在全国范围内推广"两山"转化与践行提供参考。     

武义萤石矿床矿物包裹体研究

矿物包裹体研究表明,武义萤石矿床是含矿地热水活动的产物。其形成温度为130°±27℃,压力为47.23-426.96×10~5帕。属于低温浅成热液矿床。冷渗流大气降水在深处受地热影响加热活化,发生水—岩化学反应和物质交换,导致含矿地热水的形成。它在构造作用和热力及压力梯度驱动下回返上升,于地表—近地表裂隙带与大气降水混合,温压骤降,加以冷的含CO_2和O_2的大气降水界入,使成矿物质自溶液中沉淀析出。     

A rate of return analysis for public forestry in Ulster

In this paper a rate of return analysis is carried out on public forestry in Northern Ireland. Analysis is based on the results obtained in two very different locations: a 100-hectare acquisition in the western part of the province where the quality of land is generally poor and a 10-hectare plantation in the east where soil and other conditions are reasonably good. The species in question is Sitka spruce, an evergreen variety which is planted for commercial purposes throughout the UK. Rate of return figures obtained here indicate that even with narrow commercial considerations, forestry in Northern Ireland is a sound venture and should expand rapidly to moderate the timber deficiency which exists in the province as well as in the UK and the EEC.