Spatial variations in daily average CO2 concentrations above wetland surface of Xianghai National Nature Reserve, China

Horizontal and vertical variations of daily average CO2 concentration above the wetland surface were studied in Xianghai National Nature Reserve of China in August, 2000. The primary purpose was to study spatial distribution characteristics of CO2 concentration on the four levels of height(0.1 m, 0.6 m, 1.2 m and 2 m) and compare the differences of CO2 concentration under different land covers. Results showed that daily average CO2 concentration above wetland surface in Xianghai National Natural Reserve was lower than that above other wetlands in northeast China as well as the worldwide average, suggesting that Xianghai wetland absorbed CO2 in August and acted as“sink” of CO2. The horizontal variations on the four levels of height along the latitude were distinct, and had the changing tendency of“decreasing after increasing” with the increase of height. The areas with obvious variations were consistent on different levels of height,and those with the highest variations appeared above surface of shore, sloping field, Typha wetland and Phragmites wetland; the vertical variations were greatly different, with the higher variations in Phragmites wetland and Typha wetland, and the lands near the shore and the sloping field with the lower variations. Spatial variations of daily average CO2 concentrations above wet!and surface were affected by surface qualities and land covers.     

佳木斯台形变观测对东北地区几次浅震“场兆”异常的探讨

大地震在主破裂前往往行成地壳变形,高应力作用下进入峰值后的变形阶段,反映到地倾斜观测日均值曲线上,表现为固体潮形变趋势异常,这些异常能否指示远距离的地震,近年来不少研究者发现,远场前兆往往出现在对应力、应变变化反应灵敏的特殊构造部位。佳木斯台可能处于这种特殊的构造部位,对东北地区浅源地震短期前兆异常“场兆”的趋势性变化具有一定的意义。     

奥运大练兵 单双号出行

距离2008年北京奥运会仅剩不到1年的时间．奥运会的各项准备工作都在紧锣密鼓地进行。为采取有效措施保障奥运会环境质量提供科学依据．积累经验，北京市于8月17日至20日，在“好运北京”体育赛事期间，进行了空气质量测试，收集削减机动车行驶对改善空气质量的测试数据。为了保证空气质量测试工作顺利进行，北京市实行了单双号、错峰上下班等方式削减行驶车辆。     

黄淮海平原水浇地、旱地不同熟制的气候资源利用

为了合理利用气候资源,提高土地生产力,探索适合我国国情与黄淮海平原的种植制度,1980—1984年期间在平原北部(北京)水浇地上连续进行了五年田间试验,1983年和1984年两年又增加了水浇地与旱地对比,并在平原中部黑龙港地区的北京农业大学曲周试验站及平原南部属黄淮平原的河南省淮阳县增加了两个点。试验设水浇地和旱地两部分,各有一年一熟(冬小麦、春玉米和春大豆)和一年两熟(冬小麦复播玉米、冬小麦套播玉米和冬小麦复播大豆)。栽培管理按当地中上水平进行。     

“长荣”因倾倒废油污染关港口而被罚款

2005年4月4日，台湾长荣海运公司旗下在巴拿马注册的“长荣国际公司”，向美国联邦司法部认罪，承认在美国东西两岸海域倾倒5百加仑废油造成生态污染的25项罪名，被罚款2500万美元，创下美国同类案件罚款纪录。长荣同时质接受美国司法部门连续3年的“后续观察”。“后续观察”期间，有关单位将对长荣海运集团旗下三家子公司，长荣国际公司、长荣美国、Greencompass Marine S．A．的货柜轮进行监控调查，以防止再犯。