Is a subtropical climate zone on earth. Generally located in the temperate zone near the tropical subtropical area (approximately 23.5 degrees N-40 degrees N, 23.5 degrees S-40 near S). Is the summer climate characteristics of subtropical and tropical similar, but winter is more obvious than tropical cold; the coldest month in more than 0 degrees celsius.
Subtropical area brief introduction
The subtropical world is an important Climatic zone
. Zhu Kezhen
That Mr. Subtropical climate
The main feature is the "winter cold, the temperate tropical crops can not grow well. The other feature for every winter is ice and snow, but the frost free period of 8 months or more, so that the parties can have crops a year of harvest". Subtropical cold and hot two season, cold season for thecryophilic crops, a warm hot season crop
Hi, cool and temperate crops of different ecotypes of two crops a year or three crops, is the basic characteristics of subtropical agriculture.
Subtropical area The subtropical distribution in China
Our country is located in the subtropical zone Qinling Mountains
To the south, Huaihe, Leizhou
To the north of the peninsula, transection
The mountains east (22 ~ 34 degrees N, 98 degrees east of the vast area of E). Involving 16 provinces (including Taiwan province), an area of about 2.4 x 106km2, accounting for about 1/4 of the land, known as "seven mountains of water two minutes of cropland" or "eight mountains of water a sub field", population accounts for about half of the total population. China Eastern humid subtropical genera Monsoon region
That position than the West Bank Climate type
South 5 ~ 8 latitude than continental climate type 6 to 7 North latitude. With the same latitude, except the desert areas, is the most warm area, rainfall than the same latitude is abundant, rich biological resources, evergreen, fertile soil, Biological productivity
High, high yield and quality of crops, is China's major agricultural production areas.
Subtropical area Soil and vegetation
The soil acidity distribution of large scale red soil and loess. The soil due to rain leaching
The microbial decomposition and perennial, most areas relative to other areas with poor soil.
Is the root characteristics of vegetation, whether in humid areas or in arid areas. The main vegetation types Subtropical Evergreen Broad-leaved Forest
, Subtropical evergreen sclerophyllous forest
Subtropical area Climatic characteristics
The hot Subtropical Mountainous and hilly regions of our country basic light rain season, hot water is rich in resources. year Total radiation
The amount in 38 * 108 ~ 54 * 108 joule
2 meters / year, more than 10 DEG C accumulated temperature
Between 4250 to 8000 DEG C, the duration of more than 10 DEG C, in 220 to 350 days. The annual precipitation is 1000 ~ 2000 mm, most precipitation in warm season crops need more water. In the growth season of major agricultural crops (4 ~ October). solar radiation
And the accumulated temperature and precipitation can be accounted for 70 of the total to 85%, with light, heat and water, is conducive to a variety of Subtropical Crop, fruit and shrub growth, with favorable conditions for the development of agriculture.
The undulating hills and valleys. Due to the impact of mountain to light, heat and water, in the vertical direction to form a clear Climatic zone
(layer), there is a transitional climate of Zhongshan obvious layer. The layer of the many phenomena of Atmospheric Physics and climate characteristics are unique to this area. along with To the mountains
The different slope, azimuth and the terrain, in the same area or the same height on the sunny slope and shady slope, slope and basin Valley, can appear totally different climate, there are ten different days ".
Subtropical area The characteristics of precipitation
But the area is also China's most precipitation, heavy rains are the most frequent, the largest area of strength. The torrential rain
The appearance, not only greatly reduces the effectiveness of precipitation, but also seriously harms the mountainous areas and the downstream areas of agricultural production. In addition, freezing, chilling injury, hail
And the mountain area Snow disaster
Also It is often seen. in this area, resulting in varying degrees of harm to agricultural production.
Subtropical area improve environment
A mountain country climatic resources
The exploitation and protection of this area should be combined with Agricultural natural resources
The reasonable utilization, vigorously develop commodity production in forestry, farming comprehensive management. In the hilly area of the forest is a place to live, and rational development and utilization of governance in the hilly and mountainous area, improve the ecological environment, reduce flood disaster, prompting Ecosystem
The virtuous cycle. Specific comments are as follows:
Increase investment in development Stereoscopic Agriculture
The hilly area of the agricultural production is still in the extensive cultivation condition, low yield, low yield orchard (such as citrus, tea, etc.) of low yield forest (such as Camellia forest, Tungoiltree
Forest、 Chinese fir forest
Etc.) accounted for a large proportion, not only a waste of valuable light, heat, water and land resources, but also cause Soil erosion
The ecological. environmental deterioration
. Reasons of extensive management is the economic and cultural backwardness, lack of materials (such as chemical fertilizers, pesticides, machinery, energy, science and technology investment introduction). Therefore, the substantial increase in investment in the hilly area of the material, promote science and technology into the mountains, gradually realize Intensive management
The necessary condition.
In mountainous and hilly areas Geomorphic features
Is a mountain of farmland. A few current cultivated land in mountainous and hilly areas of agriculture mainly concentrated in the mountain valley on the hillside, and many have not been reasonable use, especially good conditions of slope is 25 degrees with the gentle slope of economic forest development, development should focus on the use and should be based on a variety of conditions, the development of fruit, tea, mulberry and Timber forest
Etc.. According to the characteristics of mountain climate, mountain multi-level layout Stereoscopic Agriculture
And develop a variety of business, maintain and improve the ecological environment of the mountain area, in order to obtain better economic benefits and ecological benefits.
The lower (altitude below 300 ~ 400m) is mainly dominated by farming, to ensure grain self-sufficiency in the premise of steady growth, expanding economic crop area, the appropriate development of economic development of subtropical fruit. Fuel forest
And actively develop grazing livestock and aquaculture, improve Agricultural Climate Resources
The utilization rate of.
The middle (elevation 400 ~ 800m) in the premise of ensuring food self-sufficiency or self-sufficiency under the development of economic forest and commercial forest vigorously, developing famous, special and excellent agricultural products, with hills and grass development of herbivores. Traffic is convenient, away from the city closer to the mountain, the cool summer climate of tomatoes, peppers, carrots and other vegetables, give full play to the mountain climatic resources
The upper layer (above 800 ~ 1000m) in developing forest. Timber forest
, Water conservation forest
And medicine, the appropriate development of edible fungi, the protective development, enhance the ecological benefits of forest vegetation on the mountain must protect, gradually develop tourism conditions in mountainous areas.
The mountain height is about 1000 ~ 1500m, human activities mainly below 1000m. The above basic is 800 ~ 1000M Farmers Humidicold
The climate in the south, layer, North Asia
The difference of tropical. The height limit in subtropical rice planting, up to 1200 ~ 1400m, Tropical North
About 900m. North subtropical maize height limit of about 1500m. Take the small scattered grazing way can use grass mountain cattle and sheep industry development.