利用 5个马尾松优良种源 ,在肥力较低的缺磷立地上布设种源与磷肥互作试验林 ,研究优良种源对不同磷投入水平的树高生长反应。结果显示 :5个优良种源对磷肥量的反应式样差异很大 ,有的种源对磷投入非常敏感 ,有的不敏感。不同种源对磷肥量的反应以及磷的时效性也很不相同。依据各种源对磷投入的不同反应初步制定了相应的幼林施肥原则。研究发现树高生长在种源间的遗传差异与磷环境有关 ,适当施以磷肥就可显著提高马尾松种源试验效果。与种源效应和磷肥效应相比 ,虽然种源与磷肥互作效应较小 ,但不能忽略它的存在 Five provenance provenances of Pinus massoniana were used to test the tree height growth response of elite provenances to different phosphorus inputs based on the interaction between provenances and phosphate fertilizer on low phosphorus fertility sites. The results showed that there were great differences in the response patterns of five good provenances to phosphorus fertilizer. Some provenances were very sensitive to phosphorus inputs and some insensitive. The response of different provenances to the amount of phosphate fertilizer and the timeliness of phosphorus are also very different. Based on the different reactions of various sources to phosphorus inputs, the principle of fertilization for young forests was initially established. The study found that the genetic difference between tree height growth and provenance was related to the phosphorus environment. Proper application of P fertilizer could significantly improve the provenance of Pinus massoniana. Compared with the provenance effect and phosphate fertilizer effect, although the interaction effect between provenances and phosphate fertilizer is small, its existence can not be neglected