What tree species are there in Horqin, Inner Mongolia?

Most of the Horqin grassland has become agricultural land and some sandy land, also known as Horqin sandy land. Named after the ancient Mongolian Horqin tribe. It is located at 42 5' ~ 43 5' north latitude and117 30' ~123 30' east longitude. It is 250 ~ 650 meters above sea level and located in the triangle between the west bank of Xilamulun River and Laoha River. It is high in the west and low in the east, stretching for more than 400 kilometers and covering an area of about 42,300 square kilometers. It belongs to Kailu County, Horqin Left-wing Middle Banner, Horqin Left-wing Rear Banner, Naiman Banner, Hure Banner, Horqin Right-wing Middle Banner, Horqin Right-front Banner, Onniute Banner, Chifeng City, Aohan Banner and Fuxin Mongolian Autonomous County of Liaoning Province in China.

Geologically, it belongs to Songliao platform syncline, Jilin quasi-fold belt and Inner Mongolia fold belt. Since the Quaternary, the western part of the grassland has risen slowly and the eastern part has sunk slightly. From the Lower Pleistocene to the Holocene, loose rock series with a thickness of more than 200 meters were successively deposited, which constituted the material basis of Tuo and Dian.

The climate of spring breeze is cold in winter and hot in summer. The average annual precipitation is 360mm, which varies greatly and is unevenly distributed during the year. Mainly concentrated in June-August, northwest wind in winter and southwest wind in spring and autumn. The annual average wind speed is 3.5m/s, the maximum wind speed can reach 2 1.7m/s, and the number of windy days often reaches about 30 days. Strong wind is an important factor in the formation and development of sandy land. The sunshine hours in the whole region are 2900 hours, and the sunshine rate is 67%. The active accumulated temperature above 10℃ is 3 160℃, and the frost-free period is 140 ~ 150 days. Tuo and Dian coexist in Horqin grassland. Tuozidi refers to mobile, semi-mobile and semi-fixed sand dunes with a relative height of more than 2 meters. The soil is white sandy soil and yellow sandy soil, and the vegetation mainly includes Cryptomeria fortunei, reed, yellow willow and elm. ? Point refers to a relatively flat sandy land with a relative height of less than 2 meters. The soil is yellow sandy soil and chestnut sandy soil, and the vegetation mainly includes cryptospermum, Leymus chinensis and Agropyron cristatum. Dianzi land refers to the low-lying wetland distributed between Tuodi and Dianzi land, which is mostly composed of various meadow soils. The vegetation is mainly composed of Leymus chinensis, inch grass moss, Sanguisorba officinalis, tiger grass and iris.