Low-lying saline-alkali land, due to low terrain, poor drainage, strong evaporation, salt accumulation on the surface, hydrogeological conditions are deteriorating. Therefore, tree species should be carefully selected for afforestation in low-lying saline-alkali land. The following introduces the tree species suitable for planting in low-lying saline-alkali land for farmers' reference. Arbor species
Robinia pseudoacacia root system can directly fix nitrogen, which is a pioneer tree species for afforestation in sandy saline-alkali land. Be careful not to plant in low-lying areas with poor drainage.
Salix psammophila is one of the fast-growing tree species in sandy saline-alkali land. It is water-resistant and moisture-resistant, suitable for cutting propagation and growing in mild sulfate soil. It can be planted on the banks of rivers and canals and saline-alkali depressions in waterlogged alkali areas, and is suitable as a pioneer tree species, a shelter forest in front of sand dunes and a firewood forest, and also an excellent tree species for farmland shelter forests.
Weeping willows, also known as willow, are moderately salt-tolerant like wetlands and watersides, and can be used as an important shelter forest tree species in saline-alkali land. Reproduce by cutting or burying.
Ailanthus altissima grows rapidly and is easy to reproduce. It should be selected as a pioneer tree species for initial afforestation in saline-alkali land, which can prevent wind and reinforce dikes, and can be planted on both sides of canals and roads with higher terrain.
The salt tolerance of Azadirachta indica is second only to that of Robinia pseudoacacia, and it can grow in arid and barren saline-alkali land with less pests, fast growth and strong germination.
Sapium sebiferum has moderate salt tolerance and good wood.
Populus tomentosa grows well in fertile and humid places, can grow normally in mild saline-alkali land, and can withstand short-term flooding, so it is suitable as an excellent tree species for fast-growing and high-yield forests, farmland shelterbelts and surrounding greening.
Hybrid Poplar Hybrid Poplars, such as Lin Zhong Poplar 46, Poplar 72 and Touyang Poplar, grow normally when the soil water content is 0.5%, the annual groundwater level is lower than 1.0m, and there is accumulated water in rainy season. They are good fast-growing trees for timber forest, shelter forest and surrounding greening.
Elm is more salt tolerant and grows well when the soil salt content does not exceed 0.4%. It can be used as an excellent tree species for timber forest, farmland shelterbelt and surrounding greening.
Mulberry has strong salt tolerance and water resistance, and can be planted on both sides of farmland shelterbelt.
Pear pear is one of the fruit tree varieties with cold tolerance, waterlogging tolerance and moderate salt tolerance. If Lidu pear is used as the rootstock of grafted pear tree, the waterlogging resistance and alkalinity are stronger. It can grow in soil with a salt content of 0.6%.
Apricot apricot is one of the most salt-tolerant soil fruit trees.
Jujube trees have low requirements for soil, and can be cultivated in mountains, hills, valleys, even barren rocky mountains and loess mountains except marshes and saline-alkali land. The adaptability to soil pH is also very strong, and there is no strict requirement for the level of groundwater. Even if the land is flooded for 30-70 cm for 30-40 days, there is still no obvious impact on growth.
Elaeagnus angustifolia is a medium-sized tree, some of which are shrub-like. It is drought-resistant, salt-alkali resistant and can fix quicksand. It is suitable to be introduced in sandy alkali areas as a lateral planting and windbreak and sand-fixing tree species in farmland shelterbelts.
Paulownia paulownia is suitable for growing in sandy saline-alkali land. It is mainly used as farmland shelter forest, but it is afraid of flooding and not resistant to moisture.
Platycladus orientalis is an evergreen tree. Wood is excellent, drought-resistant, barren-resistant, with few pests and diseases, and can grow well in soil with salt content of about 0.2%.
Shrub tree species
Amorpha fruticosa grows rapidly and has strong adaptability. It can be used as a low-lying forest in the windbreak belt of saline-alkali sandy land, and it grows well when the soil salt content is 0.4%.
Tamarix chinensis lour, also known as red wattle and oak willow, has strong drought resistance, barren resistance and saline-alkali resistance, and can be used for wind prevention, sand fixation and bank protection. It can be planted on both sides of all levels of channels in saline-alkali land and saline-alkali land with poor vegetation.
Salix psammophila is a deciduous shrub with rapid growth, strong adaptability, light saline-alkali tolerance, sand fixation and bank protection, and is suitable for planting in lightly saline-alkali wetlands, river beaches, plain slopes and sandy alkali wasteland.
Fraxinus mandshurica can grow in low humidity soil with salt content of 0.2%-0.5%. It can be used for greening trees and cultivating gray stems beside horses. Can survive and grow after being flooded for many days.
Acid thorn acid thorn, also known as vinegar willow and sand thorn, is drought-resistant, moisture-resistant, cold-resistant, alkali-resistant and shallow-rooted, which can improve the soil and is the pioneer of afforestation in saline-alkali land. (Li)
Source of information: Farmers Daily