The increase of the light intensity makes the temperature increase effectively. When the temperature increases to a certain degree, the photosynthetic rate does not increase but it decreases, indicating that Sudan grass is entering the photosynthesis/midday break 0, which also indicates that the photosynthetic rate is not synchronized with the light intensity and temperature.
The photosynthesis/midday break 0 phenomenon of Sudangrass occurs from 13:00 to 16:00, and the photosynthetic rate and photosynthetically active radiation are not synchronized. Photosynthesis is a very complex physiological process in plants. Net photosynthetic rate and self factors such as chlorophyll content and leaf thickness Leaf maturity, etc. are closely related, but also by the temperature, light intensity, stomatal conductance, transpiration rate, air relative humidity and other effects. By studying the main environmental factors affecting the photosynthetic rate of Sudan grass, it was found that the temperature was significantly positively correlated with transpiration rate and stomatal conductance, and negatively correlated with relative humidity. This was consistent with the conclusions of studies on other plants, and the light The intensity directly affects the temperature. Therefore, the most important environmental factors affecting the photosynthetic rate of Sudan grass are temperature and light.
The determination of photosynthetic apparatus found that, in addition to its excellent quality as a forage grass, existing studies have shown that Sudan grass has a certain ability to resist salt and drought, and can grow well in salinized soil in arid areas, so it is in Xinjiang. It may become a pioneer plant in ecological restoration. At present, preliminary results have been obtained in the study of fragile ecosystem restoration in the Tarim River Basin. Due to the rapid growth characteristics of Sudan grass, it also has a good application prospect in remediation of heavy metals in soil. In addition to the needs of CO2 reduction and source increase response measures due to climate warming, the high carbon-fixing efficiency of plant sudan grass will inevitably become a research. Hot spots.
Take a deep breath, close your eyes, the world has the freshest oxygen ... Yu Quan's "Deep Breath" is well known to us, but as the environmental problems become more and more serious, the haze sky also increases, PM2.5 PM10 and so on Vocabulary has also been mentioned more and more, and air purifiers have quickly become popular on the market with this "air quality" trend. Along with this, the air-clean brand has sprung up, and various technologies are dazzling. Which ones are indeed effective and which are just tasteless propaganda? How does the Air Purifier bother us to get rid of pollution? And look at the editors for you.
Analysis of air purifier
The critical value of PM2.5 content is 75 μg / m3
The pollutants in the air mainly include soot, total suspended particulates, inhalable particulates (PM2.5) and fine particulates (PM10). The smaller the diameter of the particulates, the deeper the part that can enter the respiratory tract. 10 micron diameter particles It is deposited in the upper respiratory tract, and particles below 2 microns can penetrate 100% into the bronchiole and alveoli.
1k-5k air purifier prices vary greatly
The air purifier products on the market not only have various functions, but also have prices ranging from thousand yuan to tens of thousands. The pricing of imported products is generally higher than that of domestic brands. Except for the core technology of many brands, the promotion of purification effects is similar, and consumers need to choose according to demand.
The air quality standard of 74 key cities is only 4.1%
According to the data of the press conference held by the State Council Information Office on June 4, according to the new "Ambient Air Quality Standards", the six pollutants SO2, NO2, PM10, PM2.5, CO and O3 were evaluated, 74 new standards In the first phase of monitoring and implementation, the proportion of cities that met the ambient air quality standards was only 4.1%, and the other 256 cities implemented the old air quality standards, and the proportion of cities that met the standards was 69.5%.
Air purifier sales increased by 90.5% compared with last year
According to a report recently released by the China Electronics and Information Industry Development Institute, due to the haze weather, air purifiers have become the most concerned home appliance products, with sales of nearly 2.4 million units nationwide last year, a year-on-year increase of 90.5%; retail The amount reached 5.6 billion yuan, a year-on-year increase of 105.9%.
HEPA filter needs to be replaced in March
The filter of the air purifier is the same as the filter of the water purifier, and it is not effective for a long time. After long-term use, the accumulation of dust on the surface of the filter will also cause the filter to gradually fail. Therefore, when the haze is more serious, the non-washable HEPA filter needs to be replaced every three months.
Merchants claim that the purification rate is more than 99% for the concept of stealing
99% or even 99.99% seems to have become a slogan for many air purifiers on the market. Many brands of products promote their high removal rate of PM2.5 and formaldehyde. In fact, this kind of publicity is more of a kind. The slogan of stealing the concept, the removal rate of 99% is the effect of the material itself on PM2.5 and formaldehyde, not the effect of actually running in space.
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