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quadrat    
n. 嵌块

嵌块

Quadrat \Quad"rat\, n. [F. quadrat, cadrat. See {Quadrate}.]
1. (Print.) A block of type metal lower than the letters, --
used in spacing and in blank lines. [Abbrev. quad.]
[1913 Webster]

2. An old instrument used for taking altitudes; -- called
also {geometrical square}, and {line of shadows}.
[1913 Webster]


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  • Quadrat - Wikipedia
    A quadrat is a frame used in ecology, geography, and biology to isolate a standard unit of area for study of the distribution of an item over a large area Quadrats typically occupy an area of 0 25 m 2 and are traditionally square, but modern quadrats can be rectangular, circular, or irregular
  • An overview of Quadrat Sampling - DataScienceCentral. com
    Quadrat sampling is a classic tool for the study of ecology, especially biodiversity It is an important method by which organisms in a certain proportion (sample) of the habitat are counted directly It is used to estimate population abundance (number), density, frequency and distributions
  • Field investigations - OCR Gateway Using quadrats in sampling - BBC
    In statistics where each item has an equal probability of being selected sampling using a quadrat involves the placing of quadrats at random coordinates Regardless of whether you are
  • Making and using a quadrat — Science Learning Hub
    Quadrats are used for sampling purposes They are squares of a set size placed in a particular habitat such as a rocky shore or forest floor Plant and or animal species within the quadrat are identif
  • QUADRAT Definition Meaning - Merriam-Webster
    For example, if the quadrat is 2 feet by 2 feet, your quadrat is 4 square feet — Avery Hurt, National Geographic , 26 June 2020 Using the magnifying glass, count every insect inside the quadrat
  • Quadrat - Required Practical - Science for Everybody
    What Is a Quadrat? A quadrat is a square frame used to sample the abundance and distribution of organisms, usually plants or slow-moving animals 💡 Key Concept: Quadrats are used to collect data from a small area, which can be used to estimate populations in a larger area When Are Quadrats Used?
  • How to use a quadrat - NHBS
    A quadrat is a square frame, usually constructed from wire or plastic-coated wire, although they can be made from any sturdy material Most commonly they measure 50cm x 50cm (i e 0 25m 2 ), and may have further internal divisions to create either 25 squares each measuring 10cm x 10cm or 100 squares measuring 5cm x 5cm
  • What Is A quadrat A level biology? - ScienceOxygen
    A quadrat is typically a square frame constructed of plastic or pvc pipe, metal rod, or wood that is placed directly on top of the vegetation Quadrats are also commonly called “plots ” Quadrats do not have to be square but their area must be known Other quadrat shapes commonly include circles and rectangles
  • What does Quadrat mean? - Definitions. net
    A quadrat is a small, typically rectangular plot used in ecology and geography to isolate a standard unit of area for study of the distribution of an item over a large area The quadrat is suitable for sampling plants, slow-moving animals, and some aquatic organisms
  • Quadrat - definition of quadrat by The Free Dictionary
    Define quadrat quadrat synonyms, quadrat pronunciation, quadrat translation, English dictionary definition of quadrat n 1 Printing A piece of type metal lower than the raised typeface, used for filling spaces and blank lines Also called quad 2 2 Any of a group of





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