This paper deals with the effects of ASU on the yield of Chinese Fir seedlings grewing on loamy yellow-red earth. The study was carried out on the basis of pot experiment by using tracer isotope ~(15)N.

• 本文系利用~(15)N示踪技术以研究ASU与氮肥配施对杉木苗的效果,氮素利用率及氮素在土壤和苗木间的平衡状况。