以5年生白皮松苗木为材料，研究了不同施肥处理下白皮松在一个生长周期内不同生长阶段叶片N、P、K元素含量的变化。结果表明，在不同施肥处理下，白皮松生长期叶片N、P、K元素含量随着施肥次数和施肥量的增加以及生育进程推移总体呈S型变化趋势，但在不同施肥条件下同一种元素含量存在一定差异，植株生长旺盛期合理施肥对白皮松叶片营养元素含量的影响明显。

This experiment selected five years Pinus bungeana Zuuc ex Endl seedlings as test materials to study the content variations and distribution rules of three nutrient elements (N， P， K) in a growth period . The results showed that the growing leaf N， P， K content of Pinus bungeana Zuuc ex Endl had S shape trend with increase of fertilization Frequency and and amount of fertilizer as well as growth process goes on， but there are some differences in the content of the same element in different fertilization conditions， the rational fertilization have significant influence on nutrient contents of Pinus bungeana Zuuc ex Endl during plant growing .

Q945.15