Fruiting Characteristics and Sexual Fecundity of Toona ciliata var.pubescens Populations in Jiulianshan National Nature Reserve
In this paper we investigated the population fruiting characteristics and fecundity of Toona ciliata var.pubescens,an endangered plant species,in Jiulianshan National Nature Reserve in Jiangxi province.The results showed that there existed on-and off-year phenomenon in fruiting with 1 year interval.The fruit setting rate was generally low in a natural pollination.Seed yields in a given fruiting year were affected by environmental conditions and climate.During the on-year of 2010,the seed yield was about 700 g per plant,with an annual average of fruit-setting rate,number of cones per flowering branch,number of seeds per cone,and seed-setting rate for 8.91％,22.91,29.55,and 12.01％,respectively.The net reproductive rate,intrinsic increase rate,finite increase rate and generation span of T.ciliata var.pubescens population was 0.038 4,-0.078,0.854 6,and 41.74 a,respectively.The fruiting and sexual fecundity characteristics showed that the T.ciliata var.pubescens populations were subjected to reproductive constraints of the less fruit-setting with many flowers in a natural pollination and a lower environmental fit together,thus the natural population would tend to a slow negative growth.
Toona ciliata var.pubescensfruitingsexual reproductionendangered plantJiulianshan
国家科技期刊平台
NSTL
万方数据
维普
