区域农田畜禽承载量预测模型构建与应用:以赤峰市为例

为对区域现有生猪养殖数量的合理性进行评价及对生猪养殖承载量进行预测,从畜禽养殖-耕地-作物系统出发,基于农田养分平衡理论及有机和无机肥合理配施方法,构建区域农田畜禽承载量预测模型。以赤峰市为例,设定有机和无机肥配施比例为5∶5,并保持现有农田N或P2O5养分盈余量不变,分别基于N和P2O5养分盈余量不变实地应用该模型。结果表明,基于N时可新增生猪养殖数量43.6万头,承载量为630.8万头;基于P2O5时可新增生猪养殖数量369.3万头,承载量为1 041.3万头。位于西拉木伦河南岸的松山区、翁牛特旗、喀喇沁旗、宁城县和敖汉旗是可新增生猪养殖的主要区域。从环境压力角度考虑,推荐基于N的预测值作为计算赤峰市可新增生猪养殖量和承载量的依据。     

Ecological accounting: new tools for a sustainable culture

Ecological accounting is concerned with providing information to assist managers with performance appraisal, control, decision-making and reporting for an organisation or region. It is based on ecological concepts and on ecological measures and values in addition to the familiar economics ones. The implementation of sustainable development requires a cultural change and ecological accounting would represent a part of this change within both organisations and wider society. In many ways, ecological accounting could help bring sustainable development into common sense and give it a place as a day-to-day business goal.     

食品应急储备配置比例及方法研究

为提升食品应急储备的科学性、合理性,在总结分析食品应急储备的种类、形式与影响因素的基础上,以我国官方发布的食物与营养发展目标为依据,确定了八大类应急储备食品的基础配置比例,并提出了食品大类配置比例的修正方法,随后综合考虑生产周期、保质期、易储性和储备成本,给出实物储备和产能储备的配置方法,最后提出了单类食品实物储备模式下单品的配置原则和方法,并以单价修正为例对单品选择性修正方法进行了说明,对不断提高突发事件应急保障工作的水平,提升应对突发事件的保障能力,实现受灾群众更科学合理的饮食结构有重要意义。     

劳动负荷与作业能力研究

劳动负荷的提高会导致作业疲劳,但适当的劳动负荷对作业能力的提高可能有一定促进作用。设计实验,分析了RPE值和相对心率的相关性,并以相对心率和RPE值为解释变量,分析了它们和反应时、两点阈之间的关系,发现反应时和两点阈在负荷增加过程中存在一个最小值点,而导致这个点出现的劳动负荷即为最佳负荷。以此最佳负荷量安排作业对合理利用劳动力,提高劳动效率,保护劳动者有一定的意义。     

中国环渤海地区县域土地适度非农化研究

基于土地非农化与经济发展阶段耦合规律的理论分析,应用承载力模型,开展了2008年环渤海地区县域土地非农化适度性的评价和土地适度非农化阈值的界定。结果表明:①受区域土地资源禀赋与经济社会需求的影响,经济社会发展对非农建设用地的需求与建设用地供给之间呈现为正反双向的"S"型曲线,两者之间的耦合变化规律以工业化完成阶段最为显著;②工业化初期至后期阶段土地非农化趋势表现为缓慢增长,土地适度非农化阈值为10.0%~17.5%;③工业化与城镇化驱动作用强度决定着土地非农化规模的区域差异。因地制宜、科学调控土地非农化进程是区域可持续发展的重要保障。     

Resilience to natural hazards: How useful is this concept?

Resilience is widely seen as a desirable system property in environmental management. This paper explores the concept of resilience to natural hazards, using weather-related hazards in coastal megacities as an example. The paper draws on the wide literature on megacities, coastal hazards, hazard risk reduction strategies, and resilience within environmental management. Some analysts define resilience as a system attribute, whilst others use it as an umbrella concept for a range of system attributes deemed desirable. These umbrella concepts have not been made operational to support planning or management. It is recommended that resilience only be used in a restricted sense to describe specific system attributes concerning (i) the amount of disturbance a system can absorb and still remain within the same state or domain of attraction and (ii) the degree to which the system is capable of self-organisation. The concept of adaptive capacity, which has emerged in the context of climate change, can then be adopted as the umbrella concept, where resilience will be one factor influencing adaptive capacity. This improvement to conceptual clarity would foster much-needed communication between the natural hazards and the climate change communities and, more importantly, offers greater potential in application, especially when attempting to move away from disaster recovery to hazard prediction, disaster prevention, and preparedness.     

Laboratory and field evaluation of Metarhizium anisopliae for the control of Dengue vector,Aedes aegypti (Insecta: Diptera: Culicidae)

Biological control at the larval stages of development of mosquitoes is one of the techniques that afford a non-expensive, easy-to-use, and environment-friendly method for mosquito control. In this study, investigations were undertaken on microbial product to develop a strategy to control mosquito larval and pupal population in the lab and field. Highest larval mortality was evident in the lab with LC₅₀ and LC₉₀ at 0.25 and 0.5 at 24?h for Aedes aegypti. In the field study, to kill mosquito larval population resulting in 100% mortality of A. aegypti required 5 days duration. The dose-dependent mortality was calculated using a lethal time of approximately 1–5 days test period. The number of mosquito bites (%) (vectorial capacity) decreased at increasing concentration of fungal insecticide. Data indicate that the fungal pathogen interacting with mosquito larvae controlled mosquitoes in the lab and field.     

上海淀山湖水环境容量评估

淀山湖是上海市重要的饮用水源保护区和生态涵养区.近10年来水质富营养化程度急剧增加,藻类水华频发,对上海饮用水源地水质安全构成了巨大威胁.为水污染控制和水质改善提供科学依据,利用已有评估模型评估了不同水质目标情景下淀山湖对COD、TN 和TP的最大容量,结果表明,在保持现状水质条件下,COD、TN和TP的环境容量分别为47213,8337.7,476.3t/a;水质控制目标为II类时,其环境容量分别为46325,1191.1,59.5t/a;水质目标为III类时,环境容量分别为68547,2382.2,119.1t/a.为IV类水质目标时,TN、TP的环境容量分别为3573.3,238.2t/a.     

The Influence of Varying Algal Biomass On Contaminant Exposure in Benthic-Planktonic Mesocosms: Copper (Ii)

Abstract

A series of mesocosms was exposed to a suite of light treatments and nutrient enrichment in order to generate algal communities of varying biomass. the influence of this biomass on the speciation of copper (II) was studied. Distribution coefficients ( _Kd,Lkg?1) were relatively high (log _Kd = 5 to 7), indicative of robust trace metal sequestration, and were likely controlled by the particulate organic carbon content (foc). Differences in _Kd over time and among treatments were significant, as was the relationship between _Kd and foc. Fluorescence quenching was used to determine binding capacities ( _Lt , M) and their associated binding constants ( _Kcond ,M^?1) in order to model the solid phase copper speciation. the _Kcond ranged between 2.1 and 5.2 × 10¹²M^?1, indicating a very strong copper-ligand complex, and was higher in mesocosms that received more light. the light _Lt increased over time, dramatically after the nutrient enrichment, but did not vary systematically among light treatments. _Lt ranged from 7.2 × 10? 7 to 4.9 × 10? 5 M. the large magnitudes of _Kd , _Kcond and _Lt ensured that greater than 97% of total copper in the mesocosms was complexed by organic matter. the total copper concentration ([Cu]_T, M) needed to reach a target dissolved copper concentration of 10^?12.5 M (pCu = 12.5) was determined for each mesocosm over time. [Cu]_T was between 8.02 × 10^?5 and 3.41 × 10^?2 M, and increased over time. the [Cu]_T normalized to the target pCu (Effective Dose Ratio, EDR) increased directly with increases in algal biomass, indicating a direct link between system productivity and copper exposure. Approximately 45% of the variance in EDR was explained by variance in total biomass, while the residual variance in EDR was due likely to differences in the strengths of particle associations and magnitude of binding capacities.     

SO2和NO2胁迫对红花荷等植物光合生理影响及抗性评价

为探讨红花荷(Rhodoleia championii)等12种园林植物抗SO2和NO2污染能力,以1～2年生实生苗为材料,通过人工气候室的盆栽实验,研究不同SO2和NO2混合气体胁迫对园林植物苗木光合参数和相对叶绿素含量的影响,并利用隶属函数法及系统聚类分析法对其抗SO2和NO2污染能力进行了综合评价。结果表明,植物叶片净光合速率、气孔导度、蒸腾速率和相对叶绿素含量基本上随着SO2和NO2胁迫的加剧而逐渐降低,但水分利用效率受净光合速率和蒸腾速率变化的影响规律不明显。综合隶属函数和聚类分析可知,红花荷和红千层(Callistemon rigidus)抗污染能力强,杜鹃红山茶(Camellia azalea)和粉红羊蹄甲(Bauhinia blakeana)抗污染能力较强,红花银桦(Grevillea robusta)和无忧树(Saraca divespierre)抗污染能力中等,大叶紫薇(Lagerstroemia speciosa)、金花风铃木(Tabebuia chrysantha)和腊肠树(Cassia fistula)抗污染能力较弱,而本地火焰木(Spathodea nilotica)、复羽叶栾树(Koelreuteria bipinnata)和樱花(Prunus serrulata)抗污染能力弱。研究结果为火电厂、陶瓷厂、钢铁厂、石化厂等重度酸污染地区植物选择提供参考。