Phenological Observation of the Extremely Small Population Plant Styrax zhejiangensis

doi:10.7525/j.issn.1673-5102.2021.02.003

Abstract

Abstract:

Styrax zhejiangensis was a species with extremely small population， and endemic in Taohuawu， Longjiang， Jiande Forest Farm， Zhejiang Province. To clarify the reason this species endangered， phenology of S.zhejiangensis was observed， including its flowering and seed setting pattern， as well as the biological characteristics of seeds. The results showed that flowers and leaves shared the same proliferation period. The characteristics of flower organs and pollen were similar to those plants of the same genus， and the seed setting rate was 21%-32%. Seeds had high morphological variations， and their insufficient plumpness and poor water permeability caused by dense and hard seed coat may affect seed germination. Abundant rainfall， and temperature differences between day and night， were two major drivers that would aggravate the falling of flowers and fruits. More attention should be paid to their seeds， flowers and fruits if we aim to conserve this endangered species.

Key words: Styrax zhejiangensis, extremely small population of wild plant, phenological observation

CLC Number:

S567.9

Guo-Lin FU, Ting-Ting LI, Ye-Hua ZHANG, Xiang-Ying WEN, Xue-Chu MA, Chu-Ping WU. Phenological Observation of the Extremely Small Population Plant Styrax zhejiangensis[J]. Bulletin of Botanical Research, 2021, 41(2): 168-173.

Figures/Tables 7

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物候期 Phenological period		观测时间 Observation time(year/month/day)
萌动期 Embryonic stage	芽膨大期 Budding stage	2018.03.10~03.18	2019.03.08~03.20
萌动期 Embryonic stage	芽开放期 Bud opening	2018.03.18~03.25	2019.03.20~03.26
展叶期 Leaf expansion stage	展叶始期 Unfolding stage	2018.03.22~03.26	2019.03.21~03.24
展叶期 Leaf expansion stage	展叶盛期 Blooming period	2018.03.26-04.10	2019.03.25~04.08
开花期 Anthesis	始花期 Initial florescence	2018.03.24~03.28	2019.03.23~03.26
	盛花期 Blooming period	2018.03.28~04.08	2019.03.27~04.05
	落花期 Flower-falling stage	2018.04.09~04.17	2019.04.06~04.12
果期 Fruiting stage	果实生长期 Fruit growth period	2018.04.18~08.03	2019.04.13~07.30
	果实成熟期 Fruit maturation period	2018.08.03~08.15	2019.07.30~08.10
	落果始期 Initial period of fruit dropping	2018.08.16~08.22	2019.08.10~08.19
	落果末期 End-of-drop period	2018.08.22~09.05	2019.08.20~09.02

观测内容 Observation content	观察年份 Observation year
观测内容 Observation content	2018	2019
开花数（朵） Number of flowers	185±28a	134±15b
座果数（粒） Number of fruits set	60±8a	29±6b
结实率 Seed setting percentage(%)	32.7±6.5a	21.6±3.9b

形态内容 Character content	最小值 Minimum value	最大值 Maximum value	均值 Average value	标准误差 Standard error	变异系数 Coefficient of variation
花柱长度Style length(cm)	1.38	2.85	2.31	0.47	0.20
雄蕊长度Stamen length(cm)	0.85	1.91	1.44	0.32	0.22
花盘直径Disk diameter(cm)	5.72	7.25	6.47	0.55	0.09
花萼长度Calyx length(cm)	0.21	0.45	0.31	0.07	0.24
花萼宽度Calyx width(cm)	0.20	0.36	0.25	0.05	0.20
花瓣长度Petal length(cm)	3.09	3.65	3.35	0.20	0.06
花瓣宽度Petal width(cm)	1.41	1.71	1.61	0.10	0.06
子房直径Ovary diameter(mm)	2.85	4.95	3.91	0.66	0.17

性状 Character	均值 Average value	最大值 Maximum value	最小值 Minimum value	变异系数 Coefficient of variation
长度 Length(mm)	14.18±1.42	16.41	10.66	0.100
宽度 Width(mm)	8.74±1.38	11.47	5.78	0.158
长宽比 Length-width ratio	1.65±0.24	1.99	1.21	0.146
千粒重 Thousand grain weight(g)	563.48±91.31	668.50	323.50	0.162

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