After Plankton are organisms that float in the water hanging due to the physical characteristics and size make the plankton can not maintain the per-stream mobile. Therefore, the direction of water flow only. Most of the small plankton that can be seen with a microscope (nuntadej na khotseni, 2554 (2011): 39) Plant plankton algae that float in a bathroom can photosynthesis. More people play an important role, regardless of whether it is direct and indirect. Many types of plants, plankton food directly to human, like algae, some types of used Hotel sapai hole as antibiotics, such as algae, chlorophyll chlorophyll substance which contains a barrel barrel Lin as antibiotics. Indirectly, of plant plankton is an important water source. There is a focus on the environment and living organisms in the plankton of water plants are living organisms that are the link between primary production (Primary Productivity) with fish and aquatic plants, plankton, thus considered as evidence in the food chain (Food chain) of natural water sources (Unity for Hsu and daughters porn clean Siri estates, 2548 (2005)) On the nature of the water source, nutrients that are essential for the growth of plankton plants buy adequate to the needs of living organisms in the water, but at present the various nutrients from sewage or waste water was released into the river. Cause that is called acidification (Eutrophication) cause a plant plankton growth occurred quickly and increase the number of Plankton blooms or Algel bloom called, which causes the water change color effect, decreased oxygen in the bacteria used in the night-time digestion causes the creature in the water to die due to lack of oxygen (Unity for Hsu and daughters porn clean Siri estates, 2548 (2005)) Factors that affect the distribution of seaweed has several factors such as temperature, season, including macronutrients in the water in the rainy season, there might be a wash, natural nutrients from the land to the water sources of plant plankton collection. When the temperature is appropriate to State, breed quickly. The study of plankton biology plant helps to get more water can indicate abundance or productivity of water bodies can be water quality indicators, as well as indicating spoilage of water. By plankton per plant resistant to a different water quality, which can be applied as an indication of water quality index. Therefore, this research studies the diversity of plankton plants in the river! Which is the most important river here in Loei province. By making use of agricultural water resources and fisheries, etc.2. the purpose of the research. 2.1 in order to study a variety of expensive plant that exploded in the river Loei province. 2.2 in order to study physical and chemical water quality in certain water bodies, which can affect the volume and type of plankton plants. 2.3 the information studies compare the distribution of the pond and the quality of the water source. 2.4. information to be used as an indicator of water quality of the river Loei province.
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