How to find the leaf agglomeration index of plants? Thank you

HM-G10 leaf area index measuring instrument can be widely used in agricultural production and agricultural scientific research, in order to investigate canopy photoplate energy resources, measure the interception of light in the plant canopy, and study the relationship between crop growth and development, yield quality and light energy utilization, this instrument is used for photosynthetically active radiation (PAR) measurement and recording in the 400nm 700nm band, and the unit of measurement is micromoles (mol seconds) on square meters and seconds.

YMJ series foliage.

The volume meter can be used to measure the leaf area index and is a portable instrument that is easy to use and can work in the field. Can.

A: Accurate, fast and non-destructive measurement of leaf area and related parameters, as well as area measurement of picked plant leaves and other flaky objects. It is widely used in agriculture, meteorology, forestry and other departments, and can be referred to.

The optical instrument method is divided into radiometry-based methods and image-based measurements according to the measurement principle.

Radiometry-based methods. The method is to calculate the leaf area index by measuring the radiative transmittance, and the main instruments are: La I-2000, AccuPaar, Sunscan, Sunfleck Cep Tometer Demon, and Trac (Tracing Radiation and Architecture of Cano2P Ies).

These instruments are mainly composed of radiation sensors and microprocessors, which use radiation sensors to obtain parameters such as solar radiation transmittance, canopy porosity, canopy void size, or canopy void size distribution to calculate the leaf area index. The first five instruments all assume uniform canopy, random leaf distribution and elliptical leaf angle distribution, which makes it difficult to measure leaf cluster canopy. By measuring the agglomeration index, TRAC can effectively solve the problem of agglomeration effect, so that the calculation of leaf area index can be calculated without assuming that the leaves are randomly distributed in space, and the calculation error between the effective leaf area index and the actual leaf area index can be reduced.

The advantage of radiometry-based instruments is that they are easy and fast to measure, but they are easily affected by the weather and often need to work on sunny days.

Image-based measurement methods. The method is to calculate the leaf area index by acquiring and analyzing the hemispherical digital image of the plant canopy, and the instruments mainly include CI-100, W inscanopy, Hemiview, HCP (Hemispherical Canopy Photography), etc., these image analysis systems are usually composed of fisheye lenses, digital cameras, canopy image analysis software and data processors. The principle is to obtain the canopy image through a fisheye lens and a digital camera, and use the software to analyze the canopy image, calculate the solar radiation transmittance coefficient, canopy void size, gap rate parameters, etc., and then calculate the effective leaf area index.

Image-based instruments and methods have higher measurement accuracy and slower speed than radiometry-based instruments, and often require post-processing of images. In addition, a uniform light environment is required for measurements, such as dawn, dusk, cloudy days, etc., as sunny days can underestimate or overestimate solar radiation or scattering by fisheye lenses.

There are a lot of them, I don't know what kind of one you don't want specifically, you can ask if you are going to use it in **.

HM-G10 leaf area index meter is recommended.

There are mainly TOP-1300 plant canopy analyzer and leaf area index meter, which can generally measure the plant canopy, and most of them will have the determination of leaf area index, and it is recommended to use TOP-1300 plant canopy analyzer to measure leaf area index, which is very accurate.

Conduct field investigations on plant species and the number of plants in a certain area, record the data, and then use the Simpson index to calculate.

a, the planting is too thin, part of the light energy can not be utilized, the utilization rate of light energy is low, a correct b, reasonable dense planting, is conducive to making full use of light energy, improve photosynthetic efficiency, to achieve the purpose of high yield, rather than making the intensity of photosynthesis equal to the intensity of respiration, b wrong

c. If the planting is too dense and the leaf area index is too large, the respiration of the plant will consume a large amount of organic matter, and C is correct

d. The planting is too dense, the plant leaves cover each other, and only the upper leaves carry out photosynthesis

Take a few leaves, use a hole punch with a diameter of 12mm to punch 3 small discs on each leaf, take a total of 15 discs, put them into a test tube, add 10ml of deionized water, vacuum pump vacuum for 2h, and measure the pH value with an acidity meter.

Put the leaf and pH test paper together, and then squeeze it vigorously with a flat surface such as a glass slide, and squeeze out a little liquid, and you can develop color on the test paper.

Plant incidence: remorse = (number of infected plants, total number of plants surveyed) 100%.

Plant disease index = [number of diseased plants at all levels corresponding to the number of stages) total number of plants surveyed highest level value] 100%.

That is to say, the disease index (disease index) should be determined: first, the disease level standard should be determined, and the severity of the disease of each investigated plant should be accurately determined according to the disease grade index during the investigation, and finally the disease index can be calculated.

Dry matter accumulation = total photosynthesis - cellular respiration (i.e. synthesis minus consumption) Dry matter weight is related to the leaf area index of plants, and a leaf area index of about 5 is ideal. That is, the surface area of the leaf is 5 times the size of the land in which it is located. Too small to receive light adequately:

Too much respiration is too strong and not conducive to dry matter accumulation.

Usually, the equivalent substitution method is used, such as taking the dry matter per unit area of the leaf as the initial amount, and then using the same part of the same plant, the same physiological condition and other leaf experiments, and taking the same large area of dry matter as the final amount, and the difference between the two is the dry matter accumulation.

Protective tissue: cells are tightly arranged and have thick cell walls. Protective. Located on the surface of various organs.

Vegetative tissue: Thin cell walls and large vacuoles. Has the ability to store nutrients. It is located inside each organ.

Transfusion tissue: The cells are connected up and down and have ducts or sieve tubes. Mechanical tissue with the ability to transport nutrients: thickening of the cell wall. It mainly plays the role of support and protection.

a. Point A in the figure is the intersection point of the two curves representing photosynthesis and respiration, and the intensity of photosynthesis is equal to the intensity of respiration, so A is correct;

b. The accumulation of organic matter = the total amount of photosynthesis - the total amount of respiration, so the area enclosed by the two curves represents the accumulation of organic matter, so b is correct;

c. As can be seen in the figure, when the leaf area index is in the range of 4-6, the accumulation of photosynthesis (i.e., the amount of photosynthesis produced - the consumption of respiration) is larger, so it is conducive to the increase of crop yield, so C is correct;

D. When the leaf area index reaches 8, the amount of photosynthesis products still increases with the increase of the leaf area index, and when the leaf area index reaches 10, photosynthesis is equal to respiration, and after that, respiration is greater than photosynthesis, so D is wrong

Therefore, d