Photon flux density

The photon flux density is usually expressed in μmol/m 2 ·s or μE/m 2 ·s. The conversion between them is 1μE=1μmol/m 2 ·s. Among them, 1 μmol/m2·s=6.022*1023*10-6 photons pass through an area of ​​1 square meter per second.

In the following, we will analyze the changes of transpiration rate and stomatal conductance of American ginseng under different photon flux densities.

Table 1 Diurnal changes of transpiration rate, stomatal conductance and influencing factors of leaves of ginseng

Table 2 Diurnal changes in transpiration rate, stomatal conductance and influencing factors of leaves of Ginseng

From Table 1, it can be seen that on sunny days, the stomatal conductance and transpiration rate of the leaves of the sturdy plants showed double peaks at different light flux densities of one day, and the corresponding conditions were at 10:00 am and 4:00 pm A peak occurs. In the morning, with the continuous increase of the photon flux density, the stomatal conductance and transpiration rate of the leaves of the participating plants also increased, reaching the maximum at 10:00. When approaching 12:00 noon, the differential pressure of water vapor saturation vapor of the American ginseng leaves is further expanded, and the leaf temperature difference is positive and maximum. At this time, the leaves will close the pores in order to protect themselves, so that the transpiration is significantly weakened and the evaporation of water is effectively reduced. In the afternoon, the photon flux density began to decline, leaf temperature began to decline, and the temperature slightly lags behind. The temperature difference between the leaves began to be negative, and the pores of the participating strains began to open. The second peak of stomatal conductance and transpiration rate followed by a slow decline.

However, the stomatal conductance and transpiration rate of the lean strains showed inconsistent states. The stomatal conductance decreases with the increase of the photon flux density, and it slightly rises in the afternoon, but it is not obvious, and then continues to decline. This is because the temperature difference between the leaves in the morning is almost 0, causing the stomata of the leaves to close, and the leaf temperature in the afternoon is higher than the temperature and the stomata is completely closed. The leaf transpiration rate rises with the increase of the photon flux density before 10:00 AM, and then the closing rate of leaf stomata decreases.

According to Table 2, low light intensity in cloudy weather leads to smaller stomatal conductance values, lower vapor pressure and transpiration rate inside and outside stomata, and reduced self-regulatory capacity of stomatal stomata, whether it is a strong or weak strain, Both stomatal conductance and transpiration rate peaked in the afternoon, and the appearance time was 2 hours behind the highest value of the photon flux density.

From the above two tables, it can also be seen indirectly that the strong resistance strains are stronger than the weak strains, and the strong strains can adjust their own stomatal conductance and transpiration rate by opening and closing the stomata to adjust their own water content. Enhance their ability to adapt to the outside world.

Cooling Equipment Series

The Cooling Equipment Series is a range of products designed to keep you cool and comfortable in any environment. Whether you're looking for a portable air conditioner for your home or office, a powerful industrial fan for your warehouse or factory, or a high-tech cooling system for your data center, we have the perfect solution for you.

Our products are designed with the latest technology to provide you with the most efficient and effective cooling possible. We use only the highest quality materials and components to ensure that our products are reliable and long-lasting. Our team of experts is dedicated to providing you with the best possible service and support, so you can be confident that you're getting the best possible product.

Our portable air conditioners are perfect for cooling small spaces such as bedrooms, living rooms, and offices. They are easy to install and operate, and they come in a variety of sizes and styles to suit your needs. Our industrial fans are designed to provide powerful cooling for large spaces such as warehouses, factories, and workshops. They are built to withstand harsh environments and heavy use, and they come in a range of sizes and styles to suit your specific needs.

For more specialized cooling needs, we offer a range of high-tech cooling systems designed specifically for data centers. These systems are designed to provide efficient and effective cooling for your servers and other equipment, ensuring that they operate at peak performance at all times.

At Cooling Equipment Series, we are committed to providing you with the best possible cooling solutions for your home, office, or business. Contact us today to learn more about our products and services, and to find the perfect cooling solution for your needs.

Cooling Equipment Series,Meal Cooler Mechanical,Meal Coolers,Spiral Coolers

Jiangsu Stord Works Ltd. , https://www.stordworks.cn