In some places, cold waves that damage rubber trees are often divided into three types: advection, radiation, and mixed types. In essence, it is the first two. Because some places (such as the northern mountains of Wuzhishan in Hainan Province) often radiate frost immediately after the advection, it is often referred to as a mixed cold wave with advection and radiation. The so-called adversary cold wave is the cold air from the north to the south, often accompanied by cold wind and rain, resulting in substantial cooling, although the absolute temperature is not very low (Hainan is often above 3 °C), but it can make plastic seedlings victims. If the duration is longer, cold-resistant tapping trees have also appeared in Hainan as contiguous whole plants withering. For such cold wave defense measures, Daejeon is mainly planting cold-tolerant varieties to its counterparts, keeping a good shelter belt, and using a cold wind barrier on the north side of the nursery. The so-called radiation cold wave is a hot day during the winter and the ground absorbs heat quickly, often reaching more than 30 degrees Celsius in the afternoon. At night, the calm winds are cloudless and the radiation emits heat rapidly. Even before midnight, even at the low latitudes of Wuzhi Mountain and north of Limu Ridge, temperatures often drop below 2 degrees Celsius, and the most severe falls below zero. The temperature of the leaves is 2 degrees Celsius lower than the temperature, forming different degrees of frost, or even freezing, causing damage to the gum trees. For this cold-tempered Daejeon, the main purpose is to remove the cover grass, grow cold-tolerant varieties on low-lying land, or pack grass on the seedlings, cover the nursery with a frost-proof shed, or wash the sun before the sun goes out. As for the method of defense against mixed cold waves, it is necessary to use the above-mentioned two kinds of comprehensive measures in the cold wave defense to effectively avoid the cold damage of rubber trees. However, it should be noted here that due to the different types and intensity of cold waves, due diligence must be taken. There are measures to be effective. Do not avoid the harm caused by non-impermissible measures. (Guangdong Land Reclamation Bureau Li Daohe)
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