防冲刷基材生态护坡技术在边坡工程中的应用

为解决工程裸露边坡对环境的影响,在生态防护工程中引入防冲刷基材(PEB)生态护坡技术,并介绍其主要功能特点和详细实施过程,结合河南燕山水库植被护坡工程实施后植物生长、浅层防护和水土保持的监测结果,对该技术进行了全面评析。结果表明,该技术在经济、植被生长适应性、抗冲刷性方面均表现出独特的效果和优势,能较快地恢复边坡原有生态效果。该技术在类似边坡的处理上可以广泛应用。     

从《清史稿》看清代淮河流域的水灾——兼述1991年淮河水灾的历史原因

本文对《清史稿·河渠志》及《清史稿·灾异志》中有关淮河流域的水灾资料进行了系统的整理和分析,从中可以窥出清代淮河流域水灾规律之大概。     

基于真实进步指标对我国可持续发展的预警评估

随着可持续发展概念的提出，国内外学者对可持续发展指标体系做出了大量的研究。但是这些指标体系大多数并没有对短期内经济的高速增长是否会对可持续发展状态产生影响做出回答。针对我国近年来经济的高速增长。本文提出的一个新问题即是我国可持续发展的风险问题。选取衡量可持续发展的经济类指标——真实进步指标（GPI）刚对我国的可持续发展是否存在风险进行预警评估．通过计算我国1994—2005年间的GPI值。并将其与我国同期的GDP值进行比较。得出了我国的经济发展具有较好的可持续性的结果。以此为依据对我国可持续发展状况进行预警评估．提出了应继续提高居民收入，扩大基础设施投资。缓解城乡分配不均。进一步不断提高经济增长的质量。以提高我国的可持续发展能力。     

Dynamic Changes and Optimal Allocation of Arable Land Conversion in Transition of Jiangsu province

With the rapid development of economy and urbanization, there is more need for land, and that the arable land faces the paradox of allocation in the agricultural sector and nonagricultural sector. How to optimally allocate land in the agricultural sector and nonagricultural sector has become an important issue. This article tries to analyze the change of arable land in Jiangsu, and then uses the MAC model to get the optimal amount of arable land that can be changed, so that we can make a deadline for protecting the arable land and come up with a method for optimal allocation.     

实施ISO 9000标准是个体防护装备生产企业发展的必经之路

1 我国个体防护装备生产企业标准化管理现状 标准化法在我国已实施多年，但是为数众多的小型个体防护装备生产企业实行标准化管理的只占行业总数的9．85％，且标准化管理水平较低，尤其是基础管理标准化工作薄弱的现象非常明显，已成为影响企业发展的最大障碍。因此，企业实行标准化管理，是企业做大做强、可持续发展的必经之路。     

Chemical tracers as indicator of human fecal coliforms at storm water outfalls

Indicators to distinguish between fecal coliforms of human and animal origin were investigated in water from storm sewer outfalls to a coastal lake during wet and dry weather. The ratio of fecal coliform relative to fecal streptococci count was used as the microbiological indicator. Concentrations of human-activities originated caffeine, anionic surfactant, fluoride, and fluorescence whitening agent (FWA) were used as chemical indicators. The ratio of fecal coliform to fecal streptococci ranged from 0.2 to 3.0, during wet weather making it difficult to interpret the origin of fecal pollution. However, concentrations of caffeine, anionic surfactant, fluoride, and FWA in storm water outflow during wet weather were much higher than those in the lake water during dry weather, indicating the presence of human waste at storm water outfall. Strong correlation between fecal coliform counts and chemical parameter values further indicated the human contribution to the fecal coliform count. In addition, a strong correlation among the chemical parameters suggested that only one of them is needed as chemical tracer to detect the presence of human input.     

Movement of diuron and hexazinone in clay soil and infiltrated pond water

Pre-emergence herbicide residues were detected in domestic wells sampled near Tracy, CA. This study sought to determine the source of contamination by comparing soil distribution of diuron [N'-(3,4-dichlorophenyl)-N,N-dimethylurea] and hexazinone [3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H,3H)-dione] in an agricultural field where the soil was a cracking clay to infiltration of residues in water captured by an adjacent holding pond. Diuron and hexazinone were applied in December to a 3-yr-old alfalfa (Medicago sativa L.) crop. Water content of soil taken after major rainfall but before irrigation at 106 d after application was elevated at the lowest depth sampled centered at 953 mm, indicating water was available for percolation. Herbicide residues (reporting limit 8 microg kg(-1)) were confined above the 152 mm soil depth, even after subsequent application of two border-check surface irrigations. The pattern of distribution and concentration of residues in the soil were similar to results obtained from the LEACHM model, suggesting that macropore flow was limited to a shallow depth of soil. Herbicide residues were measured in runoff water at the first irrigation at 20 microg L(-1) for diuron and 1 microg L(-1) for hexazinone. Runoff water captured in the pond rapidly infiltrated into the subsurface soil, causing a concomitant rise in ground water elevation near the pond. Herbicide residues were also detected in the sampled ground water. We concluded that the pond was the predominant source for movement to ground water. Since addition of a surfactant to the spray mixture did not reduce concentrations in runoff water, mitigation methods will focus on minimizing infiltration of water from the pond.     

试用期可以依法延长

在上一期的文章中,笔者表达了试用期不能由单方强行延长的观点,这一立论的依据是,试用期乃是劳动合同的一部分,而劳动合同则是劳动关系当事人双方合意的产物,不能由任何一方通过单方的行为来加以改变.基于这一前提,或许有人会问,既然单方改变不合法,那么双方协商一致变更试用期总可以吧？     

Distribution and leaching of methyl iodide in soil following emulated shank and drip application

Methyl iodide (MeI) is a promising alternative to methyl bromide in soil fumigation. The pest-control efficacy and ground water contamination risks of MeI as a fumigant are highly related to its gas-phase distribution and leaching after soil application. In this study, the distribution and leaching of MeI in soil following shank injection and subsurface drip application were investigated. Methyl iodide (200 kg ha(-1)) was directly injected or drip-applied at a 20-cm depth into Arlington sandy loam (coarse-loamy, mixed, thermic Haplic Durixeralfs) columns (12-cm i.d., 70-cm height) tarped with virtually impermeable film. Concentration profiles of MeI in the soil air were monitored for 7 d. Methyl iodide diffused rapidly after soil application, and reached a 70-cm depth within 2 h. Relative to shank injection, drip application inhibited diffusion, resulting in significantly lower concentration profiles in the soil air. Seven days after MeI application, fumigated soil was uncapped, aerated for 7 d, and leached with water. Leaching of MeI was significant from the soil columns under both application methods, with concentrations of >10 mug L(-1) in the early leachate. The leaching was greater following shank injection than drip application, with an overall potential of 33 g ha(-1) for shank injection and 19 g ha(-1) for drip application. Persistent residues of MeI remaining in soils after leaching were 50 to 240 ng kg(-1), and the contents were slightly higher following shank injection than drip application. The results suggest that fumigation with MeI may pose a risk of ground water contamination in vulnerable areas.