Method and device for determining plant transpiration efficiency precisely

Abstract

The invention provides a method and device for accurately measuring the transpiration efficiency of plants. The basic principle is to use a sealed cover to suppress the surface evaporation of the cultivation container (box) (to make it approach "zero") moisture, and measure the weight change of the growing plant cultivation box Obtain transpiration water consumption, take plant samples to obtain dry matter accumulation, and then calculate plant transpiration efficiency. The measuring device used in the present invention comprises a closed incubator, a closed air pressure balance box and a connecting pipe arranged between the two boxes, and a seedling hole is arranged on the upper surface of the incubator. The main advantages of the present invention are: effectively suppressing the water loss caused by soil evaporation, solving the problem of root respiration and oxygen supply under sealed conditions and the problem of pressure change regulation under sealed conditions, the quantitative addition of nutrients and water is accurate, and the water consumption and biomass of transpiration are guaranteed accurate weighing. The measuring device has the advantages of low cost, good sealing performance, short measuring time, and less root separation loss, which is beneficial to batch testing.

Description

technical field [0001] The invention relates to a method for accurately measuring the transpiration efficiency of plants and the device used, especially suitable for rapid and batch determination of the utilization of plant water in the growth process, providing a basis for water-saving agricultural research, belonging to biological physiological test methods and equipment technology field. Background technique [0002] Plant transpiration efficiency refers to the amount of dry matter formed by transpiration per unit mass of water during the growth and development of plants. There are differences between different plants and different varieties of the same plant. The commonly used unit is g kg -1 , is an important index to measure the water use of plants, and is an important physiological basis for the research of water-saving agriculture. Its measurement methods mainly include: [0003] Weighing method: within a certain period of time, transpiration water consumption / dry ...

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Problems solved by technology

There are disadvantages that the method is indirect, the location of the sample has a great influence on the measurement result, and the equipment is very expensive (millions of dollars).

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