When Li Ao visited Hangzhou, he said that the "Helan Mountain" in Yue Fei's "Man Jiang Hong" was in Nanjing. Is there any basis?

Helan Mountain (Mongolian:; Ala？ An a? Ula) is located at the junction of Ningxia Hui Autonomous Region and Inner Mongolia Autonomous Region in China today, with a north-south trend, about 200 kilometers long, and the main peak of Aobaogeda is 3556 meters above sea level. The west of Helan Mountain is Tengger Desert and the east is Hetao Plain, which is an important dividing line between geography and climate.

There have been human activities in Helan Mountain area since ancient times, including the rock paintings of Helan Mountain in Paleolithic Age, the Baisikou Twin Towers in Xixia Period and other relics. In Mongolian, Helan means galloping steed, hence the name Helan Mountain (this is wrong, Wei Chan wrote a poem in the Tang Dynasty: "Helan Mountain is under the orchard").

Helan Mountain is located at the junction of temperate grassland and desert grassland. The vertical distribution of vegetation is very obvious, and the vegetation types are very complicated. There are 55 flora in Helan Mountain, 1 1 vegetation types. There are grasslands, deserts, coniferous forests, sparse grasslands, as well as various shrubs, meadows and a small number of deciduous broad-leaved forests. [5]

Mountain grassland is divided into two subcategories: typical grassland and desert grassland. Sparse grassland is distributed in the low and semi-arid zone of Helan Mountain, with an altitude of 1, 600-2000m, between the mountain grassland belt and the mountain coniferous forest belt, forming a complete mountain sparse grassland belt. Due to the drought in the low mountainous area of Helan Mountain, the evaporation is large, the temperature in the middle and sub-alpine areas is too low, and the hydrothermal conditions are not suitable. The deciduous broad-leaved forest in Helan Mountain area is small and scattered.

The vertical differentiation of vegetation in Helan Mountain area is very obvious, which is mainly divided into four vertical vegetation zones, namely, the piedmont desert and desert grassland zone below 1600 meters above sea level, and the hilly and low mountain grassland zones with relatively high coverage and good growth of herbs at 1900 ~ 3 100 meters above sea level. Among them, the pure forest belt of Picea crassifolia distributed on the shady slope at an altitude of 2400~3 100 meters is the most important forest belt in Helan Mountain area with large canopy density and good regeneration. [6] Above 3100 meters, it is mainly alpine and subalpine shrub meadow belt, which is a good summer pasture.

The distribution of vegetation on yin and yang slopes in Helan Mountain area is very different. In low mountain areas, the sunny slopes are mostly grassland plant communities, and the shady slopes are mostly shrubs. In the Zhongshan belt, Picea crassifolia forest is the main shady slope, and mesophytic shrubs such as elm and juniper sparse forest are the main sunny slopes. There is no obvious difference between the yin and yang slopes of alpine meadow above 3 100 meters. Due to its proximity to desert, the southern and northern sections of Helan Mountain have a high degree of desertification and a small forest area. The east slope of Helan Mountain is steep and steep, and its water retention capacity is poor. Compared with the gentle western slope, the forest coverage and vegetation are relatively simple.

The plant community diversity in Helan Mountain area is rich, and the forest types are mainly Picea crassifolia forest, Pinus tabulaeformis forest, Sabina vulgaris forest, Populus davidiana forest, Pinus tabulaeformis forest, Picea crassifolia forest, Populus davidiana forest, Pinus tabulaeformis forest, Sabina vulgaris forest and Sabina vulgaris forest. There are 690 species of wild vascular plants belonging to 324 genera and 80 families in the nature reserve, among which wild soybean, Tetraena mongolica, Ammopiptanthus mongolica, Prunus mongolica and Syringa mongolica are the key protected plants in the country and autonomous region. [7]

There are many kinds of wild animals in Helan Mountain area, including red deer, roe deer, argali, leopard, rock sheep, sable and blue pheasant 180. There are 0/77 species of wild animals/kloc-belonging to 20 orders and 44 families. Among them, golden eagle, black stork, bustard, vulture and white-tailed sea eagle are national first-class protected animals, and there are 13 species of national second-class protected animals such as rock sheep, red deer, blue pheasant and musk deer. [8]

From 65438 to 0988, Helan Mountain was listed as a national nature reserve.

What Li Ao said may not be right.