西南桦配比施肥试验

[Objective]In order to explore the best growth rate for the pure plantation of Betula alnoides,the fertilization experiment was carried out in Wanshiqing area of Fujian Hua'an Jinshan National Forest Farm.[Result]There were no significant differences in tree height,DBH and individual volume of Clone No.1,No.2 and No.3 among different treatments of nitrogen fertilizer experiment.However,there were significant or highly significant differences in tree height,DBH and individual volume of Clone No.4 of nitrogen fertilizer experiment,and treatment No.5 was the optimal choice.For the nitrogen fertilizer experiment,there was significant difference among different treatments in the variation of pH value,organic matter or available K.There was no significant difference among different treatments in the variation of total N,total P,total K,alkali-N,olsen P,available Mg or activated Al.In terms of the variation pH value and available Mg,only the treatment No.4 was significant difference from other treatments,and treatment No.4 was superior to treatment No.7,among which there was significant or highly significant difference between treatment No.4 and treatment No.7.There was no significant difference in tree height,DBH and individual volume among all treatments in the phosphate fertilizer experiment.Applying 500g per hole(tree)and 1000g per hole(tree)with phosphate fertilizer as the base fertilizer caused damage to B.alnoides plantlets at the early stage,and the leaves turned yellow,but gradually recovered in the later stage.For phosphate fertilizer experiment,the variation of pH value,organic matter,total N,total P,total K,alkali-N,olsen P,available K,available Mg and activated Al were significantly different among different treatments,and the variation of pH value of treatment No.1 was superior to treatment No.7.There was significant difference in organic matter,and the variation of treatment No.7 was superior to that of treatment No.5.There was significant difference in available K,and the variation of treatment No.7 was superior to that of treatment No.6.There was no highly significant difference among all treatments in all aspects.In the nitrogen fertilizer experiment,treatment No.5 was the best of all,i.e.500g calcium superphosphate was applied to each hole as the base fertilizer,and 50g urea and 30g potassium chloride were applied for the first time in the first year.For the second time,100g urea and 60g potassium chloride were used.In the second year,100g urea and 60g potassium chloride were used for the first time,and 150g urea and 90g potassium chloride were used for the second time.In the third year,0g urea and 90g potassium chloride were used for the first time,and no fertilizer was used for the second time.In the nitrogen fertilizer experiment,treatment No.5 was the best of all,i.e.250g of calcium superphosphate as the base fertilizer,and 50g urea and 30g potassium chloride was applied for the first time in the first year;For the second time,100g urea and 60g potassium chloride were used.In the second year,100g urea and 60g potassium chloride were used for the first time,and 150g urea and 90g potassium chloride were used as top dressing for the second time.In the third year,150g urea and 90g potassium chloride were used for the first time,and no fertilizer was used for the second time.[Conclusion]The experimental results showed that 250g Calcium Superphosphate was optimal to use as basal fertilizer for B.alnoides reafforestation,and urea and Potassium Chloride were used as topdressing,namely 50g urea and 30g Potassium Chloride were used as topdressing for first time of the first year,for the second time,100g urea and 60g Potassium Chloride were applied.In the second year,100g urea and 60g Potassium Chloride were used as top dressing for the first time,and 150g urea and 90g Potassium Chloride were for the second time.In the third year,0g urea and 90g Potassium Chloride were used as topdressing for the first time,and 0g urea and 0g Potassium Chloride were for the second time.38 months after reafforestation,the individual average height,DBH and volume reached 6.76 m,10.02 cm and 25.63 dm3,respectively.