Effects of Nitrogen,Phosphorus and Potassium Fertilizer on Growth,Soil Nutrient Content and Soil Enzyme Activity of Young Plantation of Pinus Sylvestris var.mongholica Litv—Taking Shandan County as an Example
This paper studied the effects of different nitrogen,phosphorus and potassium fertilizers on the growth,soil nutrient content and soil enzyme activity of young artificial forests of Pinus sylvestris var.mongholica Litv in Shandan County,Zhangye City.Four plots were divided into plots A,B,C and D respectively,and plots A were used as the blank control group(no fertilization).The effects of different fertilization methods on the growth,soil nutrient content and soil enzyme activity of young plantation of Pinus sylvestris var.mongholica Litv were evalu-ated in plots B,C and D respectively.The results showed that the plant height,volume and DBH of young pine in plots B,C and D were higher than those in plots A,and the plant height of young pine in plots B was the highest,increasing by 29.35％,21.43％and 29.03％,respectively,compared with plots A.The contents of carbon,nitrogen,phosphorus and other nutrients in 0～10 cm surface soil and＞10～20 cm subsurface soil of young plantations in plots B,C and D were higher than those in plots A,but the pH value was lower than that in plots A.Compared with plots A,the activities of sucrase,urease and catalase in young plantations of Pinus sylvestris var.mongholica Litv in plots B,C and D were improved.Compared with phosphate and potassium fertilizers,nitrogen fertilizer has the best fertilization effect,and has a more positive effect on young artificial forests.In afforestation,nitrogen fer-tilizer can be applied reasonably according to the actual situation.
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