JPH0131589B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plant physiological measuring device, and more particularly to a plant physiological measuring device that can be set directly on the leaves of a plant to be measured to measure the physiological state of the plant.

Conventional plant physiological measurement devices that measure the amount of photosynthesis, transpiration, etc. of plants are equipped with a separately formed assimilation box that accommodates one or more leaves of the plant to be measured. This is a method in which carbon dioxide, etc., absorbed or generated by the leaves in the assimilation box are measured by communicating the assimilation box with the measuring section through appropriate piping.

The above-mentioned assimilation box is somewhat large, and piping and wiring must be appropriately attached to control the dew point inside the assimilation box, making the entire device large-scale. The problem was that it could not be used easily.

Furthermore, since the assimilation box and the measuring section are connected to each other through piping, etc. as described above, the total volume of the assimilation box and piping is large, which slows down the detection speed when detecting carbon dioxide, etc. The problem was that the detection sensitivity was poor.

The present invention has been made in view of the above circumstances, and provides a plant physiological measuring device having a measurement function that has a fast detection speed and high detection sensitivity when detecting carbon dioxide, etc. in plant leaves. The purpose is to

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the plant physiological measuring instrument according to the present invention shown in the drawings will be described.

FIG. 1 is a block diagram showing an example of a plant physiological measuring device equipped with a plant physiological measuring device according to the present invention. In the figure, reference numeral 1 denotes a plant physiological measuring device (hereinafter referred to as the measuring device) according to the present invention, and a carbon dioxide detection sensor 12 and an oxygen detection sensor 13, which are electrochemical sensors using Voltammetry, are attached as sensors for plant physiological measurement. It is being This carbon dioxide detection sensor 12 and oxygen detection sensor 13
A leaf LF of the plant to be measured is attached to the clamping member 11 of the measurement unit as described later (see Fig. 4).
The carbon dioxide released by the clamping member 11 and the oxygen inside the clamping member 11 are detected. This detected data is then A/D converted by the analog/digital converter 2 and input to a predetermined input terminal of the microcomputer 3. Then, the microcomputer 3 performs predetermined arithmetic processing to calculate, for example, the amount of photosynthesis (instantaneous value and integrated value) of the plant, and this calculated data is displayed on the display 4, while the recorder 5 For example, information is now being recorded on graph paper.

FIG. 2 is a perspective view showing the external appearance of the measuring device 1, FIG. 3 is a partial plan view of the main parts of the measuring device 1, and FIG. 4 is a partially cutaway side view of the measuring device 1. 11,1
Reference numeral 1 denotes a holding member formed, for example, in the shape of a wide-mouthed container and having an opening that is surface-connected to the object to be measured.
Consisting of a circumferential side part 11a and a bottom part 11b, the circumferential side part 1
1a is formed, for example, in the shape of a circular ring with an appropriate wall thickness, and a flat bottom portion 11b formed in a circular shape is appropriately fixed to one end of the opening of the circumferential side portion 11a. The bottom portion 11b is made entirely or partially of a transparent material, such as glass, transparent plastic, transparent acrylic resin, or the like. Note that when measuring the amount of transpiration, respiration, assimilation, etc. in the absence of light, the bottom portion 11b does not need to be transparent, and the bottom portion 11b may be made of an opaque material, or a transparent portion of the bottom portion 11b may be used. An optical shutter that can be opened and closed may be provided. Appropriate sensor mounting holes 11c are formed in the side wall of the peripheral side portion 11a, and a carbon dioxide detection sensor 12 and an oxygen detection sensor 13 are installed in the sensor mounting holes 11c with their detection surfaces facing inside the holding member 11. It is installed in an airtight condition. That is, since there are two holding members 11, upper and lower, the oxygen detection sensor and carbon dioxide detection sensor are attached to each of the upper and lower two, so a total of four sensors are attached, as shown in FIG. It is being Two approximately square rod-shaped support rods 1
41, 141 and a substantially U-shaped arm 142 attached to one longitudinal end of the support rods 141, 141,
142, and the other longitudinal ends of the support rods 141, 141 are rotatably connected by a pin 141a. As a result, the arm portions 142, 142 and the support rods 141, 141 rotate around the pin 141a, so that the arm portions 142, 142 can freely approach and separate from each other. Both radial end portions of the circumferential side portion 11a are rotatably attached between both ends of the arm portion 142 by pins 142a. This results in
The two holding members 11, 11 can be freely moved toward and away from each other with their openings facing each other. Also arm part 1
Relay connectors 15, 1 at required locations of 42, 142
Lead wires 12a, 13a from the sensors 12, 13 are connected to the inner terminals, and electric wires 21, 22 connected to predetermined input terminals of the A/D converter 2 are connected to the outer terminals. One end of is connected. Further, a suitable narrow groove 11d is formed all around the edge of the opening of the holding members 11, 11, and an O-ring 11e is fitted into this narrow groove 11d. Note that instead of the O-ring 11e, a suitable gasket may be fitted into the narrow groove 11d.

When measuring, for example, the amount of photosynthesis of a plant using the plant physiological measuring device having the plant physiological measuring device according to the present invention configured as described above, it is carried out as follows.
That is, the leaf LF of the plant to be measured is held between the openings of the holding members 11, 11 as shown by the dashed line in FIG.
In this case, no gap should be created between the surface of the leaf LF and the O-ring 11e. In order to maintain the state in which the leaves LF are held between the openings of the holding members 11, 11, required portions of the support rods 141, 141 are fixed with appropriate elastic members (for example, rubber, etc.). Then, the O-ring 11e slightly bites into the surface of the leaf LF, and the insides of the holding members 11, 11 become substantially airtight on the front and back sides of the leaf LF.
Since light rays such as sunlight enter from the transparent bottom part 11b, photosynthesis in the portion of the leaf LF covered by the clamping members 11, 11 can be carried out without any problem. and leaves
The sensor 12 detects carbon dioxide absorbed on the front and back surfaces of the LF, and the sensor 13 detects oxygen in the clamping members 11 and 11, respectively, and these detection data are transmitted to the lead wires 12a and 13a and the electric wires 21 and 13.
22 to the A/D converter 2. The amount of photosynthesis (instantaneous value and integrated value) is displayed on the display 4 as described above, and is also recorded on, for example, graph paper by the recorder 5.

As is clear from the above description of one embodiment of the plant physiological measuring device according to the present invention, the volume of the measuring container of the measuring section is small, and various sensors for plant physiological measurement are directly attached to this measuring container. The detection speed when detecting carbon dioxide, etc. in plant leaves is fast and the detection sensitivity is high. Furthermore, the detection section is formed in a small size, and unlike conventional devices of this type, there is no need to attach piping, wiring, etc., so the entire device is simple and can be easily used outdoors. Furthermore, since the front and back sides of the leaf to be measured can be made in separate airtight conditions, it is possible to measure different items on the front and back sides of the leaf, or it is possible to measure the same items and share the measurement data. The upper and lower sides of the leaf can be compared.

In the above-mentioned embodiment, a carbon dioxide detection sensor and an oxygen detection sensor were attached to the measurement container of the detection unit as plant physiological measurement sensors, but the present invention is not limited to this, and other sensors such as a leaf temperature sensor, a solar radiation sensor, and a moisture sensor may also be used. It is also possible to install a sensor of this type.

Further, in the above embodiment, both the holding members 11, 1
1 is formed into a substantially wide-mouthed container shape, but the present invention is not limited to this. One of the holding members 11 may be formed into a substantially wide-mouthed container shape, and the other holding member 11 may be formed into, for example, a flat plate shape.

Furthermore, in the above embodiment, the bottom portions 1 of both clamping members
Although 1b is formed of a transparent material, one or both of the holding members 11 may be formed entirely of an opaque material.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a plant physiological measuring device equipped with a plant physiological measuring device according to the present invention, and FIG.
The figure is a perspective view showing the appearance of the plant physiological measuring instrument according to the present invention, and Figures 3 and 4 are a partial plan view and a partially cutaway side view of the main part. 1... Measuring section, 11... Holding member, 11a...
Circumferential side part, 11b...bottom part, 11e...O ring,
12... Carbon dioxide detection sensor, 13... Oxygen detection sensor, 14... Opening/closing member, 141... Support rod, 142... Arm, 2... Analog/digital converter, 3... Microcomputer, 4... …
Display, 5...Recorder, LF...Leaf.

Claims (1)

[Claims] 1. Two container-shaped clamping members each having an opening that is surface-connected to the plant to be measured;
An opening/closing means for opening and closing both the clamping members, an oxygen detection sensor and a carbon dioxide detection sensor airtightly attached to each of the clamping members, and an opening of the clamping member at the edge of the opening of the clamping member. 1. A plant physiological measuring device comprising an airtight means attached to an edge of a part to make the inside of the plant to be measured and the container inside the clamping member airtight when the plant to be measured is clamped.