除草剂对植物光合作用和吸肥能力影响初探

本文应用P~(32)、C~(14)同位素示踪技术研究棉花与大豆施用三种除草剂对植物吸肥能力和光合作用的影响。结果表明,拿捕净抑制棉花对P~(32)的吸收,稳杀得反而起促进作用,禾草克影响不明显,三种除草剂对光合作用的抑制影响,稳杀得>拿捕净>禾草克。施药一周后,大豆和棉花的光合作用已恢复正常,施用拿捕净和稳杀得的两种作物对P~(32)的吸收均起促进作用,而施用禾草克的作物对P~(32)吸收已逐趋正常。     

Associations of trace elements in aerosol at the south Adriatic coast

We applied statistical methods to the data of a 5-year sampling period to characterize the features of trace elements in airborne particulate matter at the South Adriatic Coast. The analysis of surface soil samples was also performed. The data were processed by cluster analysis, enrichment factor determination and receptor rose statistics. It is shown that the principal element association consists of Fe, Mn and Ti originating from surface material resuspension. Hg and Se were shown to originate from more complex natural and anthropogenic processes. A strong emission source of Cd and Se was identified in the SSE direction.Selected article from the Regional Symposium on Chemistry and Environment Krusevac, Serbia, June 2003, organized by Dr. Branimir Jovancicevic.     

双波长标准加入法同时测定水中硝酸盐和亚硝酸盐

本文应用双波长标准加入法同时测定了硝酸盐和亚硝酸盐，在研究硝酸盐和亚硝酸盐紫外光谱的基础上，精确选择亚硝酸盐等吸收点波长２０２．５ｎｍ，２１６．５ｎｍ为测定波长。亚硝酸盐含量回归方程经推导得Ｃ＝－３．８４１＋１５６．６Ａ，相关系Ｒ＝１．０００。将该法用于合成样品及实际水样分析，所得结果较满意。     

哈尔滨市松花江段水质自然净化机理分析与水环境保护策略

河流水体受污染后，在自然环境因素的影响下由各种物理、化学及生物作用能得到一定的净化。哈尔滨市松花江段河流水质净化作用主要包括稀释、吸附、江底沉积物的机械过滤与吸附和絮凝沉淀作用。哈尔滨市松花江断面正处于河流侵蚀与堆积交替动态平衡中，可不断提供新的活性表面，使河底沉积物的净化作用持久不衰。该特殊的地质条件是本段河流保持较强净化作用的关键，妥善利用水环境净化能力是一种经济有效的水污染控制手段。     

Canopy structure versus physiology effects on net photosynthesis of mountain grasslands differing in land use

The present paper aims at investigating how changes in canopy structure and species physiology associated with the abandonment of mountain meadows and pastures affect their net photosynthesis. For this purpose, a multi-layer vegetation–atmosphere transfer (VAT) model is employed, which explicitly takes into account the structural and functional properties of the various canopy components and species. Three sites differing in land use are investigated, a meadow, a pasture and an abandoned area. Model simulations agree reasonably with measured canopy net photosynthetic rates, the meadow featuring the highest daily net photosynthesis, followed by the pasture and, finally, the abandoned area. A detailed process analysis suggests this ranking to be mainly due to bulk canopy physiology, which decreases from the meadow to the pasture and the abandoned area, reflecting species composition and species-specific photosynthetic capacities. Differences between the canopies with regard to canopy structure are found to be of minor importance. The amounts of green, photosynthetically active plant matter are too similar at the three sites to be a major source of variation in net photosynthesis. Large differences exist between the canopies with regard to the amount of photosynthetically inactive phytoelements. Even though a model analysis showed them to be potentially important, most of them are accumulated close to the ground surface, where they exert little influence on canopy net photosynthesis.     

取代芳烃对绿藻、斜生栅列藻急性毒性的自相关拓扑指数

本文提出新的原子生物活性值 (ai) ,由其建构自相关拓扑指数 ( mL) . 1 6种氯代芳烃对绿藻的急性毒性 ( -lgEC50 )与其0 L ,1L的回归方程为 :-lgEC50 =0 6 1 99+2 6 1 6 3× 1 0 - 6　1L2 5+ 0 0 0 92 0 L ,r=0 936 3. 1 8种苯酚、苯胺类化合物对斜生栅列藻的急性毒性 ( -lgEC50 )可以表示为 :-lgEC50 =1 1 374 + 0 1 4 4 71L0 6+ 0 0 0 2 70 L,r=0 95 35 .用Jackknife法检验 ,以上模型具有总体稳健性 .     

原子吸收分光光度法测定植株中钙、镁的几种样品前处理方法的比较

本文比较了原子吸收分光光度法测定植株中钙、镁的三种样品前处理方法：干友化法、１ｍｏｌ／ＬＨＣｌ振荡提取法（振荡法）和１ｍｏｌ／ＬＨＣｌ静止浸泡提取法（浸泡法）．结果表明，振荡法和浸泡法对钙的测定结果平均分别为干灰化法的１０１％和９２．０％，对镁的测定结果平均分别为１０３％和９７．６％．振荡法和浸泡法与干灰化法之间不存在显著性差异（α＝０．０５），它们之间有极显著的正相关性（相关系数在０．９９以上）．因此，在大批量样品的常规分析中，１ｍｏｌ／ＬＨＣｌ提取法可代替干灰化法．     

微孔扩散管曝气试验

本文综术字在污水处理站使用离心鼓风机穿孔管大气泡浅 支暴气所引起的溶解氧不足。     

活性炭水处理技术应用

本文综述了活性炭水处理的特点，主要影响因素，活性炭的再生及活性炭吸附法在水处理中的应用，从而论证了活性炭吸附法应用于水处理的可行性和有效性。     

吸附分离技术在大气污染防治中的应用研究

简述了硝酸尾气、黄磷尾气等污染物中NOχ、SO2、P、As、PH3、CO对生态环境产生的危害，及采用吸附分离技术在治理气体污染物中的应用。