杉木初级种子园种用价值测定初步结果

GENETIC QUALITY ESTIMATION OF FIRST-GENERATION SEED ORCHARDS OF CHINESE-FIR

本文报道了我国近50个已形成商品生产力的杉木种子园,种子遗传品质的大田测验幼林结果。试验表明:①各地种子园的种子与未经改良的种子一样,均有不同的遗传品质,说明并非所有种子园种子都有同等使用价值;②不少种子园的种子比当地一般种子的遗传品质要高,说明具有一定的改良效果,但比优良种源区的种子的种用价值又低了些。可见,不经实地试验,推广杉木种子园种子,应取慎重态度。为了提高初级种子园的遗传品质,极需要做种子园的去劣淘汰。

A series of trials using bulked seeds, routinely collected from the 50 seed orchards and three kinds of commercial seedlots as controls ck1, ck2, ck3, were established at four locations in the northern part of range of Chinese-fir. The main objectives are: to identify outstanding seed orchards for plantation in that region, where the trial located; to test the effectiveness of the phenotypic plus-tree selection and also to provide information prerequisite to future management procedures of seed orchards. The early results showed that while the young trees derived from about 1/2 of the seed orchards studies grew faster than their controls which had collected from the county where the seed orchard located, the progenies of almost all seed orchards were inferior to those of the best provenance in juvenile growth. Therefore, these results also suggested that phenotypic selection without progeny test was not so effective as provenance selection. The superiority of seed orchards should be regarded cautiously as certainty and in most cases may not necessarily be better than the use of seeds of the best provenance. Roguing of first-generation seed orchards should be a critical task in future.