Beyond hypoxia：Occurrence and characteristics of black blooms due to the decomposition of the submerged plant Potamogeton crispus in a shallow lake

Organic matter-induced black blooms(hypoxia and an offensive odor) are a serious ecosystem disasters that have occurred in some large eutrophic shallow lakes in China. In this study, we investigated two separate black blooms that were induced by Potamogeton crispus in Lake Taihu, China. The main physical and chemical characteristics, including color- and odor-related substances, of the black blooms were analyzed. The black blooms were characterized by low dissolved oxygen concentration(close to 0 mg/L), low oxidation-reduction potential, and relatively low pH of overlying water. Notably higher Fe2+and∑S2-were found in the black-bloom waters than in waters not affected by black blooms. The black color of the water may be attributable to the high concentration of these elements, as black FeS was considered to be the main substance causing the black color of blooms in freshwater lakes. Volatile organic sulfur compounds, including dimethyl sulfide, dimethyl disulfide, and dimethyl trisulfide, were very abundant in the black-bloom waters. The massive anoxic degradation of dead Potamogeton crispus plants released dimethyl sulfide, dimethyl disulfide, and dimethyl trisulfide, which were the main odor-causing compounds in the black blooms. The black blooms also induced an increase in ammonium nitrogen and soluble reactive phosphorus levels in the overlying waters. This extreme phenomenon not only heavily influenced the original lake ecosystem but also greatly changed the cycling of Fe, S, and nutrients in the water column.     

稚嫩坚强的花朵

前方的记者时不时传来灾害现场和紧急救援的图片和新闻,加之报纸电视上铺天盖地报道,如此惨烈的视觉冲击中,再坚强的人也需要有足够的心理承受力。每每画面中出现瓦砾灰土掩盖下的孩子,面对那经过灾难洗礼之下满脸稚气的笑容,你还是忍不住会放声哭泣:倒塌的教室里,露出了昂扬的头颅;     

关在那不遥远的地方

我不能不凝视她。就像凝视最后一个春天,就像凝视转瞬即逝的流星,就像凝视天际唯一的一朵云彩,我如此绝望而深情地凝视着她。在那云卷云舒、花开花落的地方,在那爬满绿色藤蔓的地方,在那无处不洋溢着阳光的地方,在那神秘美丽的伊甸园,我,便是那棵见证亚当与夏娃爱情的生命树。     

当身体与自己"背道而驰"

鲜花怒放、争奇斗艳,本是惹人喜爱的风景,但有些人遇见花朵却只能绕道而行;山珍海味、稀有珍馐,本是让人垂涎的美味,但有些人在餐桌上却只能举著不前;甚至家里的洗涤剂都会让他们掩面而逃,在办公室的复印机都会令他们狂咳不止……     

当前我国道路交通安全存在五类问题

在近期多起校园案件的思考中，人们注意到，面临高度危险的突发性事件时，小学幼儿园能调动起来保护学生的力量明显缺乏，学校教育提醒、家长监护这样的小学生、幼儿人身安全保护传统模式，已经受到严峻挑战。     

中国大学生发现花朵能修复被石油污染土壤

中国大学生发现紫茉莉、凤仙花、矮牵牛适合生长在高达1%石油污染的土壤上,并对污染土壤具有较好的修复效果。该研究成果有望在修复被石油污染的土壤、沉积物、地表水以及地下水方面发挥作用。     

家庭中孩子的安全教育

最近,经常听到一些儿童意外伤亡事故的发生,花朵般的孩子就这样过早地凋零和枯萎,心里感到痛心的同时更增强了对孩子安全教育的重要性的认识,如果这些孩子有一定的安全意识,有一定的自我保护能力和求生能力,那么他们受到的伤害可能要小一点.     

让美丽与我们同住

碧绿的草,巍峨的山,秀丽的河,五颜六色的花朵,洁白的云朵。与我们同行,与我们同住。怎么才能留住身边的美丽呢?首先,我们要植树造林。现在社会经济发展起来,就开始砍伐树木,盖高大的楼房。楼房虽然高大美丽,但还是不如树木重要,树为我们遮荫,为我们净化空气,为我们绿化世界。众所周知,以前翠绿的树林是鸟儿们安心的小窝,可这几年的树木越来越少,鸟儿也越来越少,新鲜的空气一去不复返了。     

理想与现实

我是一个小女孩,是一个盲人。我从来也没有看见过外面的世界,可是我想外面的世界应该是五彩缤纷的,那里有翠绿的草坪、草坪上有五颜六色的花朵,像是在翠绿香草味蛋糕上加了许多酱汁。鱼儿在清澈见底的小河里游泳,犹如在一块碧绿的翡翠上镶了许多颗宝石。看!     

朱炳肇：咖啡渣中种出“蘑菇花朵”

咖啡渣也有出路 朱炳肇是新加坡籍华人,很早就来中国经商,同许多白领一样,平时最喜欢光顾各种个性咖啡馆。