1, light, heat and water are sufficient, and their high values are basically synchronous.
The climate changes greatly in a year. It is hot in Leng Xia in winter, changeable in spring, sudden drop in autumn, rainy in spring and summer, and drought in autumn and winter. The climate changes greatly from year to year.
3. The most obvious vertical climate change zone is the mountainous area surrounded by mountains on three sides. Especially in the mountainous area of southern Hunan.
Hunan is located in south-central China, south of the middle reaches of the Yangtze River. In the Song Dynasty, it was designated as Jinghu South Road, which began to be referred to as Hunan.
Extended data
Influence of Hunan Climate on Agricultural Production
The main disaster affecting the development of agricultural production in Hunan is drought, followed by flood, followed by low temperature chilling injury and high temperature chilling injury. Although there is little precipitation in rainy season this year, and there is a serious shortage in some places, the drought is not very serious so far because of the uniform distribution of precipitation periods. Only a few towns have floods, and there is no cold damage in spring.
The hot weather lasts from mid-July to early August, lasting for 17~ 19 days, with the longest history of more than 40 days, with the highest temperature of 39.5℃ and the highest temperature in history reaching 4 1℃.
On the whole, Hunan has been a good year. Hunan recovered quickly this spring. From mid-March to late April last year, it was a frequent period of low temperature and rainy weather or "cold in late spring", which happened to be the spring sowing and seedling raising period. If low temperature occurs during this period, seeds and seedlings will rot. If no measures are taken, it will delay the season and reduce the output of the year.
The temperature is high in May, and there is no "low temperature in May". Fortunately, the low temperature didn't happen all spring. Spring sowing crops have a bumper harvest per unit area.
reference data
Baidu Encyclopedia-Hunan