两次种源试验结果表明：火炬松种源间生长、干形、结实等性状变异显著，变异属地理渐变型；影响生长的主导因子是原产地的热量和生长期的降水量，生长量随种源原产地气温升高、无霜期长。６—９月降水量增加而增加，随纬度增高而下降。佛罗里达的马里斯、纳索、利维，佐治亚的埃文斯、格林，南卡的乔治城，路易斯安娜的利文斯通等种源，为本次试验评选出的优良种源 The results of two provenance experiments showed that the characters of growth, dryness and fruiting of Pinus taeda were significant, and the variation was geographically gradual. The dominant factor affecting the growth was the caloric of origin and the amount of precipitation in growing season Provenance of origin temperature, long frost-free period. From June to September, the precipitation increased with the increase and decreased with the increase of latitude. Florida, Marius, Nassau, Levi, Georgia, Evans, Greene, Georgetown in South Carolina, Louisiana Livingston and other provenances for the pilot selected excellent provenance