Seedling quantitative characteristics and dynamics of Syzygium hancei populations in Guangxi, China

doi:10.17521/cjpe.2023.0052

Abstract

Abstract:

Aims Syzygium hancei is the dominant species in the seasonal rainforests of the coastal zone of Guangxi. It plays an important role in restoration of the coastal ecological environment. Hence, investigating the population dynamics of natural S. hancei populations in Guangxi is of significant importance.
Methods In this study we monitored seedlings of S. hancei populations in three distinct communities (A, B and C) in Fangchenggang City over a period of two-years. Data on seedling survival rates were collected, and dynamic life tables were established. Survival curves, mortality curves, and survival function curves were constructed and analyzed.
Important findings Our results showed that: (1) The survival curves of populations A and C exhibited Deevey-II type characteristics, whereas the curve for population B displayed Deevey-III type characteristics. The mortality curves experienced substantial fluctuations during the early stage, but eventually stabilized, oscillating between 0.2 and 0.4 in the later stage. (2) Survival analysis demonstrated that the survival rates of populations A, B, and C followed an initial increase followed by a decrease. The cumulative mortality rate in the later period consistently exceeded the survival rate. Survival function fluctuations of population B were more stable compared to populations A and C. (3) The comprehensive analysis showed that all the natural regeneration capacities of those three S. hancei populations were low, with population B exhibiting the most stable capacity. The low natural regeneration capacity can be attributed to a limited germination base, high mortality rate of seedlings, and insufficient light, resulting in fewer seedlings progressing to the subsequent growth stage.

Key words: Syzygium hancei, population, seedling, dynamic life table, survival curve, survival analysis, natural regeneration capacity

WANG Yan-Ling, ZHAO Li-Jun, ZHU Li-Qiong, MO Ruo-Guo, LIN Ting, ZHAO Xiao-Yu. Seedling quantitative characteristics and dynamics of Syzygium hancei populations in Guangxi, China[J]. Chin J Plant Ecol, 2023, 47(9): 1278-1286.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2023.0052

https://www.plant-ecology.com/EN/Y2023/V47/I9/1278

Figures/Tables 8

References 25

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样地编号 Sample plot No.	面积 Area	乔木层 Arbor layer			灌木层平均高度 Mean height of shrub layer (m)	草本层平均高度 Mean height of herb layer (m)	郁闭度 Canopy density (%)
样地编号 Sample plot No.	面积 Area	密度 Density (plant·hm^-2)	平均胸径 Mean DBH (cm)	平均高度 Mean height (m)	灌木层平均高度 Mean height of shrub layer (m)	草本层平均高度 Mean height of herb layer (m)	郁闭度 Canopy density (%)
A	10 m × 10 m	2 455	6.27	6.55	0.84	0.15	80
B	10 m × 10 m	1 073	6.81	6.46	1.05	0.22	35
C	10 m × 10 m	1 505	6.53	6.38	1.28	0.29	60

样地编号 Sample plot No.	面积 Area	乔木层 Arbor layer			灌木层平均高度 Mean height of shrub layer (m)	草本层平均高度 Mean height of herb layer (m)	郁闭度 Canopy density (%)
样地编号 Sample plot No.	面积 Area	密度 Density (plant·hm^-2)	平均胸径 Mean DBH (cm)	平均高度 Mean height (m)	灌木层平均高度 Mean height of shrub layer (m)	草本层平均高度 Mean height of herb layer (m)	郁闭度 Canopy density (%)
A	10 m × 10 m	2 455	6.27	6.55	0.84	0.15	80
B	10 m × 10 m	1 073	6.81	6.46	1.05	0.22	35
C	10 m × 10 m	1 505	6.53	6.38	1.28	0.29	60

变异来源 Source of variation	df	均方 Mean square	F	p
光照强度 Light intensity	2	389 435.375	20.333	0.000
地表温度 Surface temperature	2	0.229	0.030	0.970
土壤含水率 Soil water content	2	33.259	1.990	0.162

变异来源 Source of variation	df	均方 Mean square	F	p
光照强度 Light intensity	2	389 435.375	20.333	0.000
地表温度 Surface temperature	2	0.229	0.030	0.970
土壤含水率 Soil water content	2	33.259	1.990	0.162

种群 Population	时间(年-月) Time (year-month)	n_x	l_x	S_x	d_x	q_x	lnl_x	k_x
A种群 Population A	2016-03	104	1 000	1.00	-1 933	-1.93	6.91	-1.07
	2016-06	305	2 933	2.93	2 298	0.78	7.98	1.53
	2016-09	66	635	0.63	327	0.51	6.45	0.72
	2016-12	32	308	0.31	-192	-0.62	5.73	-0.48
	2017-03	52	500	0.50	279	0.56	6.21	0.81
	2017-06	23	221	0.22	86	0.39	5.40	0.49
	2017-09	14	135	0.13	29	0.21	4.91	0.25
	2017-12	11	106	0.11	-	-	4.66	-
B种群 Population B	2016-03	173	1 000	1.00	-347	-0.35	6.91	-0.30
	2016-06	233	1 347	1.35	977	0.73	7.21	1.30
	2016-09	64	370	0.27	220	0.59	5.91	0.90
	2016-12	26	150	0.15	-133	-0.89	5.01	-0.64
	2017-03	49	283	0.28	-40	-0.14	5.65	-0.13
	2017-06	56	323	0.32	86	0.27	5.78	0.31
	2017-09	41	237	0.24	75	0.32	5.47	0.38
	2017-12	28	162	0.16	-	-	5.09	-
C种群 Population C	2016-03	115	1 000	1.00	-974	-0.97	6.91	-0.68
	2016-06	227	1 974	1.97	1 687	0.85	7.59	1.93
	2016-09	33	287	0.29	148	0.52	5.66	0.73
	2016-12	16	139	0.14	-122	-0.88	4.93	-1.63
	2017-03	30	261	0.26	61	0.23	6.56	1.26
	2017-06	23	200	0.20	35	0.18	5.30	0.08
	2017-09	19	165	0.17	35	0.21	5.22	0.35
	2017-12	15	130	0.13	-	-	4.87	-