Study on the Change of Needle Nutrient Element of Masson Pine under atmospheric Pollution

A comparison was made between a masson pine stand under atmospheric pollution with the one in a normal area and the content of needle nutritional elements(N,P,K,Na,Ca,Mg,Mn,Zn,Cu,Fe)of masson pine.P,K deficiency in needles in air pollution area are significant,but Fe in needles in pollution area is five times as much as that in the normal area.The mean needle length of masson pine in pollution area is shorter than that in the normal area and the percentage of yellow needles is higher.The productivity loss is about 50% by preliminary assessing.