九连山毛红椿种群的结实特性及其生殖力

doi:10.11707/j.1001-7488.20130725

Abstract

Abstract:

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.

Key words: Toona ciliata var. pubescens, fruiting, sexual reproduction, endangered plant, Jiulianshan

CLC Number:

S718.4

Huang Honglan, Zhang Lu, Guo Xiaoyan, Liang Yuelong, Liu Zugen. Fruiting Characteristics and Sexual Fecundity of Toona ciliata var. pubescens Populations in Jiulianshan National Nature Reserve[J]. Scientia Silvae Sinicae, 2013, 49(7): 170-174.

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Fruiting Characteristics and Sexual Fecundity of Toona ciliata var. pubescens Populations in Jiulianshan National Nature Reserve

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