马尾松幼林施肥后营养动态研究

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

Study on the Nutrition Dynamics of Young Forests of Pinus massoniana Treated with Fertilization

This is a relationship between the nutrition status of leaves and the growth of trees in young plantation of Pinus massoniana. Through the whole year, the curves of the content of N,P,K,Ca,Mg all show two peaks in May and {September respectively} while the physiology activity is most vigorous and the growth of the trees is the fastest. The experiment shows the nutrition content of P100 is the fastest among those treated experiment with P50, P100,P200,P50K100,P100K100,N100P100K100, which show significant fertilization effect and grow faster. The fertilizer effects reaction in the third year and the forth year are similar to the first two year.Soil fertility declining exists in Pinus massoniana plantation, but fertilization has positive effect on improvement of soil fertility and dulls the soil fertility declining.