Geographical environment of Lingui district

Lingui is located in the southern edge of the south, narrow from east to west and long from north to south, showing a torch shape. The mountains in the north are towering and the mountains in the south are continuous. The east is slightly lower than the west and inclines from northwest to southeast, forming the east-west watershed.

The northwest belongs to Santaishan system, which is the residual vein of Yuechengling. This mountain is very big, and its peaks are tall and straight. There are 24 seats above1000m and 64 seats above 800 ~1000m. Guangfuding, the highest peak, is1524m above sea level. Under the influence of neotectonic movement, lithology and external force, the hillside is steep and steep, the gully is cut strongly, the upper part is wide and the lower part is narrow, the cross section is V-shaped, and mountains and deep valleys can be seen everywhere. There are many rivers in the canyon, especially cliffs, terraces and pot caves along the river.

The southwest belongs to Jiaqiaoling mountain area, with 24 peaks at 800- 1 100 meters, and the highest point is vanilla rock, with an altitude of 1 176 meters. Jiaqiaoling is composed of metamorphic rocks, which are hard and not easy to be eroded by water, so the peaks are rugged, the streams are deep and the valleys are quiet, and the valleys are steep and narrow. Due to the long-term erosion by running water, the mountain is gradually broken and the valley is gradually expanded into a small ravine.

The southeast is the peak forest plain, with many limestone mountains and abrupt solitary peaks, and the elevation is mostly below 500 meters. There are many underground rivers, karst caves in this area, so the scenery is colorful and the mountains and rivers are beautiful. The middle part is hilly plain and karst mountain, and the top of the mountain is round or steamed bread-like, with a slope of 15 ~ 30, and no obvious mountain trend, with a relative height of 70 ~ 300m. Because it is located in the air taxiway and the "Gui Xiang Corridor" channel, the warm and humid air flow is difficult to stagnate, and the dry and cold air flow bears the brunt, with frequent cold current activities. Located at low latitude, it belongs to subtropical monsoon climate. Influenced by strong solar radiation and monsoon circulation, it has four distinct seasons, abundant heat, abundant rainfall and mild and humid climate. Summer is long and humid, the heat is rare, and there is occasional hail; Winter is short and dry, cold and rare, with occasional light snow; Spring and autumn are the same, the temperature in autumn is slightly higher than that in spring, and the alternating law of winter and summer monsoon is obvious. Due to the complex terrain, frequent cold air activities and more disastrous weather, the regional distribution of light, temperature and water is also quite different.

The area is located in the subtropical monsoon region, with an annual average temperature of 19. 1C, an extreme maximum temperature of 39.6℃ and an extreme minimum temperature of-1.6℃. The northeast wind is the main wind direction throughout the year, and the humidity is relatively high. But the four seasons are distinct, the rainfall is abundant, and the climate is mild and humid. Annual average precipitation 1869 mm, frost-free period of 302 days.