Robinia pseudoacacia L-An excellent species for afforesting the limestone hills in north Guangdong Province

Robinia pseudoacacia L is a plant which is distributed in Temperate Zone.It had been planted widely in central and north China.In 1991,we first introduced this plant into Guangdong Province on a large scale and planted for afforesting the limestone hills in north Guangdong Province.The results showed that this plant could grow well in the limestone hills in north Guangdong.This species could adapt to arid and thin soil of limestone hill.Its roots were plump and juicy.It has nodules that can fix nitrogen.Robinia pseudoacacia L gained high growth speed when it had been planted in limestone hill for three years.Six years old tree could reach 4～7 meters high.The forest of Robinia pseudoacacia L could obviously improve the environment in limestone hills through preventing soil erosion,increasing the capacity of soil to reserve water,lowering soil and air temperature,increasing air humidity especially in hot and dry season.