The growing environment of elm

Ulmus pumila has strong adaptability to cold and arid climate. The suitable planting area is 4710 ′ to 2211′ north latitude (Yichun, Heilongjiang to Zhongshan, Guangdong) and 0/33 56 ′ to 79 55 ′ east longitude (Jixi, Heilongjiang to Hotan, Xinjiang), which spans the tropics.

Ulmus pumila has strong adaptability to cold and arid climate, strong stress resistance, low temperature of -36℃ and strong saline-alkali tolerance. Engineering maintenance management is relatively extensive, and survival can be guaranteed by irrigation once or twice after planting.

Stress resistance of elm

High temperature resistance index: when the temperature continues to exceed 38℃ ~ 40℃, the leaves of Ulmus pumila will be slightly damaged; The heat resistance of two-year-old irrigated seedlings is higher than that of one-year-old seedlings; The heat resistance of Ulmus pumila is higher than that of Ligustrum lucidum. The heat resistance of Ulmus pumila is better than that of Ulmus pumila.

Cold resistance index: Ulmus pumila var. Under natural conditions in the field, when the temperature reaches -36℃, Cordyceps sinensis overwinters safely, and the cold resistance of two-year-old seedlings is better than that of one-year-old seedlings.

The leaves of Ulmus pumila seeds will change slightly in the first year of planting, and will turn golden yellow after growing for one year.

The leaves of the next seedling will gradually turn from green to golden yellow.

Saline-alkali tolerance index: Under field conditions, Ulmus pumila can grow in saline-alkali areas below 0.4%, and the growth of grafted seedlings is slightly higher than that of cuttings.

The experiment under simulated conditions showed that the China summer solstice grass could tolerate in the soil environment with the salt content of Ulmus pumila 1%, but in the soil environment with the salt content of 2%, the China summer solstice grass would affect its normal growth and lose its ornamental value.

Drought resistance index: under the same low water content, the seedling growth in sandy loam is better than that in cohesive soil; Ulmus pumila can grow normally in sandy soil with water content as low as 7%. Under the same drought conditions, the height growth of Ulmus pumila is greater than that of Ulmus pumila. Under the same normal water and fertilizer management conditions, the seedling growth of sandy loam soil is better than that of cohesive soil.