What is transpiration, which is the process by which plants dissipate water in the form of steam. Transpiration is a simple process. However, in reality, the nature and behavior of leaves become very complex. This is a very complicated phenomenon. Obviously, certain environmental conditions must be available for water to transpiration from the leaves to the environment and turn liquid water into water vapor. Environmental factors that have an important influence on transpiration are usually considered to be solar radiation, temperature, Wind speed, relative humidity and soil water supply. The determinants of evaporation and evapotranspiration are different. Evaporation depends on the water distribution on the crown and on the exchange of energy in the wet and dry parts. The resistance of the evapotranspiration to the surface of the dried crown can be described by the Jarvis model. The plant transpiration measurement system is capable of measuring the transpiration of plants. WeChat sweep to get more professional information:
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The plant physiology method is mainly used to determine the water loss of a part or whole of a plant and can be used as an auxiliary method for analyzing the relationship between plants and water. Mainly include: rapid weighing method, stomatometry method, air chamber method, isotope tracer method and heat pulse method. In some special cases, such as the complexity of the terrain, isolated small pieces or single plants, only the physiology method can be used to estimate the amount of transpiration. At present, in China, this method is a common method for determining or calculating transpiration of trees. The main disadvantages are: due to the representativeness of the sample, it is difficult to accurately calculate the total transpiration of a large area plant using the transpiration of a single plant or several plants.
The plant transpiration measurement system needs to point out that the research object of the current evapotranspiration mode is almost limited to a single crop system or a forest system, but in the agroforestry system where two or more plants coexist, the underground part is disorderly and The unique vegetation structure formed by the overlapping and overlapping of the canopy on the ground increases the complexity of various parameter processing and the difficulty of research work, making the research progress of the evapotranspiration model of the agroforestry system slow.
In addition to the application of the plant transpiration measurement system for the determination of transpiration, there are many methods for determining the transpiration of plants, and three possible methods of calculating evapotranspiration, such as Howard's method, net radiation method and Penman's method. People have also conducted random simulations and forecasts of evapotranspiration. Many researchers at home and abroad have conducted a lot of research on stochastic simulation and forecast of evapotranspiration and achieved some results, but the current domestic model is used to simulate and predict crop evapotranspiration. The stochastic models can be classified into autoregressive moving average models, autoregressive models, multiplication models, linear decomposition models, and transfer function noise models. 