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为了解造林后杉木林地土壤肥力的变化情况及施肥对林地土壤肥力的影响，经对杉木中心产区土壤肥力中等的杉木林地设固定样地，进行了土壤肥力的监测研究。结果表明，杉木林地施肥后土壤的理化性质得到了明显的改善。施肥后第2年，土壤的含P量，P2和P2K1处理分别比对照提高了13％和21％．而P2K1处理的速效和缓效K比对照提高了20％和19．5％；施肥后第4年其含P量分别大25％和28％，而P2K1处理的速效和缓效K比对照提高了21％和29％；造林后．随着林龄的增加杉木林地的土壤肥力呈逐年下降的趋势。造林5年后，离树干距离40cm的土壤含N、P、K肥的下降比例较离树干距离80cm的慢。
In order to understand the change of soil fertility and the effect of fertilization on soil fertility of Cunninghamia lanceolata forest after afforestation, soil fertility monitoring was conducted on fixed-type Chinese fir land with medium fertility in the central fir producing area. The results showed that the physical and chemical properties of soil after Cunninghamia lanceolata forest fertilization has been significantly improved. In the second year after fertilization, soil P, P2 and P2K1 treatments increased by 13% and 21% respectively compared with the control. The K and K treatments of P2K1 were increased by 20% and 19.5%, respectively. Compared with the control, the content of P in P2K1 was increased by 25% and 28% at the fourth year after fertilization, respectively, while that of P2K1 increased by 21% % And 29%; after afforestation. With the increase of forest age, the soil fertility of Cunninghamia lanceolata forest decreased year by year. After 5 years of afforestation, the decline rate of N, P, K fertilizers in soils 40 cm away from the trunk was slower than that in the trunk 80 cm.