杉木初级种子园合理疏伐对种子产量的影响

Effect of thinning rationally of Cunninghamia lanceolata primary seed orchards on the output of seed

对杉木初级种子园进行适时合理疏伐，可使种子园种子产量大幅度增加。按照无性系生长的差异，每公顷保留２４０～３００株、３００～３６０株对种子增产效果显著。疏伐后种子产量年均每公顷达１１４．２ｋｇ。

If Cunninghamia lanceolata primary seed orchards are thinned rationally and timely, the output of the seeds will increase greatly. According to the difference of the clones growth, when 240～300 or 300～360 stems are kept per hm 2 in orchards, the seed production is on the steady increase. The per hm 2 annual output of seeds will take average of 114 2 kg. Author’s address Linduo Forest Farm of Tiane County, Guangxi 547300 PRC