Measuring method and device for determining relationship between plant transpiration and leaf area

Abstract

The invention relates to a measuring method for determining the relationship between plant transpiration and leaf area, comprising the following steps of: sowing a plant inside an inner cylinder with the plant being corresponding to a seedling emergence hole and a seedling emergence slit, and adjusting moisture to a soil water content until there is no stress for the plant growth; providing an outer cylinder with soil and moisture which are consistent with those in the inner cylinder, and measuring the quality difference of the inner cylinder and the variation of the plant leaf area so as to obtain the relationship between the plant transpiration amount and the plant leaf area. According to the method, a device which can be used comprises the inner cylinder, the outer cylinder and a feed pipe, wherein the inner cylinder is a cylindrical shell with a lid and with the bottom sealed; the lid is provided with the seedling emergence hole; the outer cylinder contains two internal-and-external layered spaces and the seedling emergence slit; the inner cylinder is correspondingly arranged inside the internal space; the seedling emergence slit is corresponding to the seedling emergence holeof the inner cylinder; and the feed pipe is connected to the external space of the outer cylinder. The device provided by the invention has a reasonable structure and can be used to effectively reduce or eliminate the interference of environmental conditions which influence the measuring result. The measuring device is simple and easy to operate with accurate measuring results.

Description

technical field [0001] The invention belongs to the technical field of farmland water balance observation, and in particular relates to a measuring method and device for measuring the relationship between plant transpiration and leaf area. Background technique [0002] Plant transpiration refers to the process of water loss from the surface of living plants, mainly leaves, into the atmosphere in the form of water vapor. In farmland, plant transpiration and soil evaporation together constitute farmland evapotranspiration. [0003] It is generally believed that soil evaporation belongs to ineffective evaporation, while plant transpiration is closely related to plant leaf area and affects plant biomass. Farmland evapotranspiration can be measured by lysimeter and other equipment, but it is a technical problem to distinguish soil evaporation from plant transpiration. [0004] Some scholars use potted plants or incubators to cover the soil surface with films, covers, straw or s...

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Problems solved by technology

[0004] Some scholars use potted plants or incubators to cover the soil surface with films, covers, straw or sand to inhibit soil evaporation. Since the growth quality of plants is less than five thousandths of plant transpiration, people usually use the water balance method to measure Plant transpiration, but potting and covering will cause the plant evaporation environment to be inconsistent with the actual situation in the field, especially the heating effect of direct solar radiation on the pot, or the reflection effect on the covering, and the temperature rise caused by the suppression of soil evaporation High factors will inevitably affect the measurement accuracy more or less

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