对苗圃金龟子幼虫化学防治的实验

本文表述了3%呋喃丹颗粒剂,50%辛硫磷乳油防治苗圃金龟子幼虫效果最好.     

超过法定退休年龄的工伤认定

[案情简介] 农民老赵今年65岁。2003年初，一直在家无事的老赵由于经济拮据，托人在该村附近的一家苗圃公司找了一份工作，从事苗圃的栽培和修剪等工作，月工资为600元，双方未签订劳动合同。2005年12月25日上午7时许，老赵在骑车上班途中被一肇事汽车撞伤致死，汽车逃逸。老赵的子女到劳动保障部门申请工伤认定。劳动保障部门对老赵之死不认定为工伤，老赵的子女不服向市政府提出行政复议。[编者按]     

氯盐类融雪剂对路域植物和土壤的影响研究

氯盐类融雪剂的使用对环境造成了严重危害,采用苗圃模拟法进行了氯盐类融雪剂对路域植物和土壤的影响试验研究。通过连续记录植物形态学特征以及对植物和土壤生理生化指标的测定,从而反映机体对逆境的响应与变化过程,深入了解融雪剂对植物和土壤的毒害发生机制。试验结果表明:随着氯盐类融雪剂喷洒次数的增加,植物中Cl~-含量逐渐增加,植株发展表现为形态健康、亚致死效应、致死效应;对于所选的3种供试植物,草皮受氯盐类融雪剂的影响最大,紫薇其次,刺柏最小;随着氯盐类融雪剂喷洒次数的增加,土壤中Cl~-含量、水溶性盐含量逐渐增加,pH值逐渐降低;植物和土壤中阳离子含量未呈现显著的规律性;植物形态的变化与植物和土壤中Cl-含量变化表现出一致性,结合植物生长条件和地面水环境《地表水环境质量标准》的规定,确定了植物和土壤中Cl-含量的临界值。     

Response of soil fauna to simulated nitrogen deposition： A nursery experiment in subtropical China

We studied the responses of soil fauna to a simulated nitrogen deposition in nursery experimental plots in Subtropical China. Dissolved NH4NO3 was applied to the soil by spraying twice per month for 16 months, starting January 2003 with treatments of 0, 5, 10, 15 and 30 gN/(m2·a). Soil fauna was sampled after 6, 9, 13 and 16 months of treatment in three soil depths (0-5 cm, 5-10 cm, 10-15 cm). Soil available N increased in correspondence with the increasing N treatment, whereas soil pH decreased. Bacterial and fungal densities were elevated by the N treatment. Soil fauna increased in the lower nitrogen treatments but decreased in the higher N treatments, which might indicate that there was a threshold around 10 gN/(m2·a) for the stimulating effects of N addition. The N effects were dependent on the soil depth and sampling time. The data also suggested that the effects of the different N treatments were related to the level of N saturation, especially the concentration of NO3- in the soil.     

园林苗圃业存在的隐患与发展对策

苗木是城市园林绿化建设、改善环境质量物质基础之一,为此本文分析了作为绿化材料生产部门的园林苗圃业可持续发展过程中存在的3个方面的隐患及其发展对策.