A study of diffusion models applied to dust emissions from industrial complexes

Industrial complexes may release dust emissions through several to up to tens of stacks, as well as via fugitive area sources. Several diffusion models for small-scale fugitive dust sources have been developed and combined with a point source model to form a series of models for industrial complexes. The applicable area of these models and the methods for obtaining the main parameters in the models have been tested and verified using measurement data gained from several field experiments. The models developed in this paper can give quite satisfactory results when compared to other current models.     

响应面法优化养殖水体中炔雌醇的固相萃取条件

在单因素试验、Plackett-Burman设计试验基础上,采用Box-Behnken响应面法对养殖水体中炔雌醇(EE2)的固相萃取条件进行优化。结果表明,洗脱液体积、洗脱液组成和淋洗液体积是影响EE2固相萃取回收率的3个主要因素;EE2的最佳固相萃取条件为:水样pH值为3,进样流量为3.0 mL/min,淋洗液为体积分数为10%的甲醇水溶液,淋洗液体积7.0 mL,洗脱液为乙酸乙酯-正己烷混合溶液(体积比为9∶1),洗脱液体积12.0 mL。该条件下养殖水样中EE2固相萃取回收率为81.6%～86.7%。     

毛竹在绥江竹海生态环境中的作用

毛竹是一种速生竹种.竹材产量高、质量优、经济效益好,其生长气候、环境又为绥江竹海规划区的大部分地区适应.所以在竹海营造过程中,选择毛竹为骨干竹种,有利于维护竹海生态平衡和实现竹海生态经济的持续发展.     

基于社会网络分析的江西各地市公路行业碳排放的关联与分异特征研究

针对各地公路碳排放的空间差异与关联特征，制定合理的低碳策略，实现各地协同碳减排，是行业可持续发展的热点问题。以江西省为研究对象，采用空间自相关、社会网络分析和引力模型等分析11地市公路行业碳排放的空间差异与关联，识别社会网络的结构特征及其演变趋势，明确不同地市在网络中的地位和作用，结果显示：（1）公路货运是公路行业碳排放的最主要来源；（2）江西省公路行业碳排放整体上呈现空间随机分布，不存在全局的空间聚集性，且局部空间聚集特征不断变化；（3）公路行业碳排放网络逐渐从南昌、新余双中心结构演变为南昌为主的单中心结构，网络的协同作用整体呈减弱趋势，核心地市对外围地市的影响力和带动作用不足。     

青藏高原湖泊细菌种群结构的研究综述

青藏高原东北地区位于我国东部季风区、西北干旱区和青藏高原高寒区的交汇地带，人为影响较少，是研究人为影响与生物种群组成的理想场所。随着分子生物学技术的迅速发展，高原湖泊菌种群结构多样性研究越来越受到人们的重视并取得了重要成果。本文从青藏高原上应用的技术方法、细菌种群结构研究成果以及区域性的重要影响因素3个方面概述了湖泊细菌种群结构多样性研究在青藏高原上取得的进展。简单地讨论了种群多样性和影响因素的关系，对比发现，微生物种群结构的主要限制性因素会随着环境的变化发生改变。同时，微生物种群结构随着环境的变化实际上是其生理结构适应的结果。     

农用地资源修正法定级之技术路线探讨——以佛山市高明区为例

目前我国农用地资源定级很少运用修正法,少数学者对修正法定级做过尝试性的实证研究工作,以期探讨修正法定级技术路线的科学性与可行性.在前人研究的基础上,以佛山高明区为例,探讨了修正法定级之修正基础的确定、修正因素的选择、修正系数的计算、定级指数的确定等几个关键技术步骤,提出了以农用地自然质量等指数作为修正基础,采用标准化方法对修正因素分值进行订正,用连乘法计算农用地质量定级指数来划分农用地级别的修正法定级的技术路线,并与因素法定级的成果进行对比分析与验证.     

Ecological Function Zoning for Environmental Planning at Different Levels

Environmental planning at different levels has been called for by environmental departments in China during last years to integrate environment consideration to economic development. Based on the accomplished environmental planning practice in Xiamen China, the paper suggests a general environmental planning process with ecological function zoning as its key steps, at the same time an effective method for ecological function zoning was formulated. The case studies of Dongfu suburban town environmental planning and Xiamen eco-city conceptual planning indicate that scientifically sound results of ecological function zoning can contribute to improving not only the adaptability and acceptability of environmental planning, also the environmental management and the decision-making. The experience shows that the ecological function zoning methods should be applied according to the principles of adaptive management, resource-based and community-based, so that it can integrate science into decision-making process, avoiding both narrow-minded viewpoints of planners and natural resource use conflicts among variety of stakeholders. Problems to be resolved in the future are also pointed out in the ending part.