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前言国内外育种实践证明:大多数分布较广的树种,存在着能获得相当于一般选择育种一、二个世代所得增益的地方小种;不同种源间的生产力优劣相差很大。杉木是我国分布较广、栽培历史悠久的特有树种,在我国广阔的幅员中,地理和气候差异完全可能产生一些具较大增产潜力的群体,近年来,在生产实践中发现:不少由不同产地构成的杉
Preface The breeding practice at home and abroad proves that most of the widely distributed tree species have local races which can obtain gains equivalent to those of one or two generations of general selection breeding. The productivity of different provenances varies greatly. Cunninghamia lanceolata is widely distributed in our country and has a long history of endemic tree species. In the vast territory of our country, it is entirely possible that there will be some groups with large potentials for increasing yield due to geographical and climatic differences. In recent years, Fir composition of origin