营造生态型的河道景观

城市河岸连通城市水陆生态系统。河道已不仅仅具有泄洪、排涝、蓄水、引清、航运等水道的基本功能,而且具有景观、旅游、生态、与周边环境互动等功能。杂草丛生的河岸看上去不那么整齐、弯弯曲曲,泥泞的河滩似乎让人难以亲近,然而就是这样“貌不惊人”的小河流,正是理想的生态河道。在许多城市,这样的河道正在逐渐增多：河道两岸的乔灌木及地被,保护着河道两则不受太阳直射,降低岸边污染物对水体的影响;河边和水面上种着千屈菜、黄菖蒲、芦苇、水葱等水生植物;在河底放养了蚌、小鱼等来修复生态链。     

48项林业行业标准5月1日起实施

国家林业局近日批准并发布《森林生态系统服务功能评估规范》等48项林业行业标准,这些标准自5月1日起实施.     

Effects of nutrition spatial heterogeneity on root traits and carbon usage by roots of Cercis chinensis seedlings in split root rooms

In natural ecosystems, nutrition available for plants shows great spatial heterogeneity. Much is known about plant root responses to the spatial heterogeneity of nutrition, but little is known about carbon usage in roots in nutrition-deficient patches and its effect on root longevity. In this study, split-room boxes were used for culture of Cercis chinensis seedlings, and the small rooms were supplied with different nutrition levels. The number of the first-order roots in the rooms with nutrition supply was significantly higher than that in the rooms with deficient nutrition. Specific root length (SRL) of the first-order roots in the rooms with deficient nutrition reached its peak at day 64 after nutrition treatment. There was no significant SRL differences between the two order roots during the experiment. Biomass of the first-order roots in the rooms without nutrition supply was significantly less than that of the first-order roots in the rooms with nutrition supply from day 64 to 96. The total biomass of the lateral roots in the rooms without nu-trition supply decreased from day 64 to 96. The activities of the enzymes in roots in the rooms without nutrition supply increased and the activities of alkaline invertases in roots in the two sides of split box did not change significantly. The activities of the enzymes in roots in the rooms without nutrition supply increased gradually. These results suggest that nutrition spatial heterogeneity induced the changes in root traits and plants actively controlled carbon usage in roots in nutrition-deficient patches by regulating the activities of invertases and sucrose synthases, resulting in the reduction in carbon usage in the roots in nutrition-deficient patches.     

北京市市级森林生态系统自然保护区现状及发展对策

自1985～2000年,北京市建立市级森林生态系统类型自然保护区7个,总面积75 862 hm2.它们在开展保护监测、科学研究、教育培训、生态旅游等方面做了大量工作.目前还存在着权属不统一、人员无编制、经费投入不足、科技力量薄弱、法规不完备等问题,据此提出了若干发展对策.     

云帆破浪——长风破浪会有时，直挂云帆济沧海

公园的建设以植物造景为主,冲破常规,再现和谐,发掘滨水空间有利的自然和人文资源,从而创造出多功能、多内涵、多层次的现代滨水区域,形成新时代的文化、休闲中心。     

马关古林箐自然保护区森林生态系统服务功能价值评估

采用替代工程法、市场价值法等方法,从直接和间接价值2个方面评价了马关古林箐自然保护区森林生态系统生态服务功能的价值.结果表明,马关古林箐自然保护区森林生态系统的生态服务功能总价值每年为5.62×108元,其中涵养水源价值为3.29×108元,净化水质价值为5.69×107元,保持水土价值为5.64×107元,固碳制氧价值为6.11×107元,净化环境价值为4.13×107元,林果产品等直接经济价值为1.75×107元.     

中方县:强化生态系统多样性保护

近年来,中方县多措并举强化生态保护,维护生物多样性,生物物种种类更加丰富,生态环境不断改善。截至目前,全县境内有维管束植物217科857属2193种,其中蕨类植物39科87属231种,裸子植物6科9属13种,被子植物173科763属1949种;国家重点保护野生植物27种,其中一级保护4种,二级保护23种;编入中国“红皮书”的珍稀濒危植物29种;国家一级保护、中国特有的稀有残遗植物钟蕚木在康龙省级自然保护区内存在4个小群,分布面积40公顷;国家一级保护植物红豆杉形成群落,散生株分布面积大60多公顷。     

保护修复让湿地生机永驻

2021年2月2日是第25届世界湿地日,主题是“湿地与水”,旨在强调湿地对维持全球淡水储量和水质的重要贡献,突出水和湿地之间“同生命、互相依”的关系,鼓励公众共同行动,为保护修复湿地作出努力。湿地是与森林、海洋并称的全球三大生态系统之一,具有涵养水源、净化水质、维护生物多样性、降污固碳、调节气候等重要生态功能,被誉为“地球之肾”。     

选对机具才赚钱

我是多年农机生产专业户,沈阳市农业机械化研究所设计的120型和180型多功能耕播联合作业机在他们搞试验时我就相中了,2007年在全市召开的春耕现场会上,我就把120型机器买了回来,这种机     

棉田生态带比较试验

2008年随着垦区种植业结构的调整,棉花面积由原来的0．8万公顷调整到0．6万公顷。适当增加了小麦、玉米、油葵、牧草、油菜、打瓜、辣椒等作物的种植面积,缓解了垦区棉花因超长连作而造成的土壤残膜污染,有效减轻了棉花各种病害的流行,使棉田生态系统逐步走向良性循环发展的轨道。