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马尾松幼林叶的养分状况与林木生长状况密切相关 ,1 a中 ,N、P、K、Ca、Mg的含量在生理活动最旺盛、生长最快的 5月、 9月呈现高峰 ;不同的施肥处理中 ,在施肥效果理想 ,林木生长比较好的 P50、 P1 0 0、P2 0 0、P50 K1 0 0、P1 0 0 K1 0 0、N1 0 0 P1 0 0 K1 0 0 ( kg·hm-2 )处理中含量比较高 ,其中 P1 0 0 ( kg· hm-2 )最高 ,反之则较低 .外加营养的效果即施肥效果在施肥后第 3、第 4年的反应与前 3a基本一致 ,肥效反应明显 .马尾松人工林存在立地衰退现象 ,施肥可改善立地 ,缓解立地衰退
The nutrient status of P. massoniana young leaves was closely related to the tree growth status. The contents of N, P, K, Ca and Mg were the most vigorous and fastest growing in May and September in 1 a. In the treatment, P50, P1 0 0, P2 0 0, P50 K1 0 0, P1 0 0 K1 0 0, N1 0 0 P1 0 0 K1 0 0 (kg · hm-2) ), While P1 0 0 (kg · hm-2) was the highest, while the other was lower.Furthermore, the effect of applied nutrition, ie, the effect of fertilization on the 3rd and 4th years after fertilization, was basically consistent with that of the first 3 years, The reaction was obvious.The Pinus massoniana plantation site decline phenomenon, fertilization can improve the site, ease the site decline