思茅松无性系种子园结实习性研究

对设于西双版纳普文试验林场的思茅松无性系种子园进行了其结实习性的研究。结果表明:(1)思茅松从开花授粉到球果成熟的历期近两年。(2)思茅松林木的球果主要分布于树冠中层,其分布率为65.2%。(3)思茅松无性系种子园不同无性系的结实率有很大的差异,且结实率均较低;在球果重、平均球果产种数、种子重及出种率等方面存在明显差异,而在果长、果径、种子千粒重等方面变异较小。(4)不同产地的思茅松优树结实有所差异。思茅曼歇坝产地的优树结实状况表现较好。

A Study of Fruiting Characteristics of Pinus kesiya var.langbianensis in Clonal Seed Orchard

The fruiting characteristics of Pinus kesiya var.langbianensis in Puwen experimental forest farm of Xishuangbanna in Yunnan province was studied.Four aspects of results were gotten as follows:1) Pinus kesiya var.langbianensis took almost two years from blooming to cone maturation.2) The cones of Pinus kesiya var.langbianensis mainly distributed at the middle part of crown,accounted for 62.5 % of the total amount.3) The fruiting rate varied very much with different clones,and the fruiting rate was low.There were significant variation on weight of cone,seed production of cone,seed weight and seeding rate;whereas the variation on fruit length,fruit diameter and 1 000seed weight were not significant.4) The fruiting characteristics of superior trees of different provenances were different,that of Manxieba provenance of Simao was good.