tailieunhanh - ENCYCLOPEDIA OF ENVIRONMENTAL SCIENCE AND ENGINEERING - LIMNOLOGY

Sự nghiên cứu chổ nước động là nghiên cứu khoa học của các chất hóa học, vật lý, và các yếu tố sinh học có ảnh hưởng đến năng suất thuỷ sản và chất lượng nước trong hồ. Hồ là quan trọng nguồn lực nhiều hơn những nơi nước ngầm, nước mặt, và lượng mưa để thu thập. Họ kiểm soát lũ lụt, cung cấp nước cho sử dụng trong nước và nông nghiệp, và cung cấp các cơ hội giải trí như bơi lội, câu cá, chèo thuyền, và nước. Hồ cũng cung cấp môi trường sống cho loài. | LIMNOLOGY INTRODUCTION Limnology is the scientific study of the physical chemical and biological factors that affect aquatic productivity and water quality in lakes. Lakes are important resources much more than places for groundwater surface water and precipitation to collect. They control flooding provide water for domestic and agricultural uses and provide recreational opportunities such as swimming fishing boating and waterskiing. Lakes also provide habitat for insects fish and wildlife such as frogs turtles waterfowl and shorebirds. Lakes commercial value in food supply tourism and transportation is worth many billions of dollars each year. Lakes also offer opportunities for relaxation and appreciation of natural beauty. According to the North American Lake Management Society this quality is not a minor asset over 60 percent of Wisconsin lake property owners who were asked what they valued in lakes rated aesthetics as especially important. . EPA 1990 . However a lake cannot be all things to all people. Desirable uses even obtainable ones can conflict. For example swimmers may want no plants but some plants are needed in order to provide fish habitat. Lakeside property owners and lake associations often want their lake to do everything they want aesthetic pleasure great fishing clean water sandy shorelines and bottoms and a healthy wildlife population without insects or weeds. No lake can meet all of these demands. This article will provide an overview of the physical chemical and biological components of lake ecosystems. An ecosystem is a system of interrelated organisms and their physical-chemical environment. It is impossible to alter one characteristic of a lake ecosystem without affecting some other characteristic of the ecosystem. The article will also explain how lake ecosystems get out of balance and what can be also done to restore the balance. LAKE WATERSHEDS AND ZONES Lakes are receiving bodies constantly receiving water dissolved materials and .