Accumulation of temperature indicators in agricultural meteorological applications
Accumulated temperature generally refers to the cumulative value of the average temperature over a certain limit temperature within a limited period of time. It is an important reference for studying the light temperature required for crops. Accumulated temperature can be used to monitor and accumulate accumulated temperature in agricultural production. In this sense, the accumulated temperature value is the "average sum," just like the total precipitation, which is the meaning of the total sum. Compared with the average temperature in the same period, it is essentially equivalent. The accumulated temperature value is the transformation form of the average value. Strictly speaking, accumulated temperature is the descriptive characteristic value in climatology.
2 What are the Limitations of Accumulated Temperature Guarantee Rate?
The commonly used cumulative temperature assurance rate refers to the cumulative climate probability above the accumulated temperature value of a certain limit. This guarantee rate is only based on the so-called lower limit value of the crop's need for heat. If it meets the minimum requirements for crops, then it is considered that the crop can be planted. In fact, it only analyzes the general possibility of crop cultivation. In other words, only analyzing the lower limit and not analyzing the upper limit value can make it impossible to solve the problem of agro-climatic regions in which crops are best cultivated. At present, some of the cultivation limits derived from the analysis of the accumulative temperature guarantee rate are basically the description of the cultivation status. Furthermore, simply relying on the analysis of the accumulated temperature guarantee rate cannot solve the relationship between various ecological factors. When solving practical agricultural climate problems, it will inevitably be greatly limited. It is necessary to overcome the limitations of the accumulated temperature indicators so as to reasonably The agro-climatic division of the crop was carried out.
2 Accumulation of temperature indicators in agricultural meteorological applications
Accumulation of temperature as a statistical measure of climate assessment on a large scale can be applied. However, when it is used in a relatively small range, it will bring about a big limitation, especially in the county area. It is not adaptable. In addition to the long-term data of county weather stations in the county, most of the information is vacant. The weather whistle and the team are basically not built, and the only information is not reliable enough. If long-period observations based on accumulated temperature theory are not easy to achieve, and the distribution of climatic factors in space is very different, the features of complicated landforms and varied climates in various regions of China make it impossible for the distribution of pure accretionary temperature lines to be comprehensive. Reflects the basic agroclimatic characteristics. Therefore, using this rough index, it is difficult to distinguish between agricultural climate and ecological differences in the middle and small scales. This is the reason why county-level agricultural climate zoning is currently quite difficult. However, county-level agricultural climate zones occupy an important position in agricultural regional planning. We must seek more scientific methods to engage in agricultural climate zones.
In summary, from the discussion of the limitations of the accumulated temperature index, it is not difficult to see that due to this limitation, the role of agricultural climate regionalization has not been fully realized, and the needs of agricultural production and agricultural zoning cannot be met. At the same time, it can also be seen that the accumulated temperature in the practical application of improper, long-term use, will inevitably hinder the advancement of agricultural meteorology disciplines, it is necessary for this in-depth study.
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