Population structure and dynamics of Reevesia pubescens var. xuefengensis in the Gaowangjie National Nature Reserve of Hunan Province

doi:10.12302/j.issn.1000-2006.202105012

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (3): 57-64.doi: 10.12302/j.issn.1000-2006.202105012

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Population structure and dynamics of Reevesia pubescens var. xuefengensis in the Gaowangjie National Nature Reserve of Hunan Province

WANG Chunhui¹^,²(), CHEN Xin¹^,²^,^*(), WANG Benzhong³, XU Zhanhong¹^,⁴

1. Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China
2. College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
3. Hunan Gaowangjie National Nature Reserve Administration, Guzhang 416300, China
4. College of Forestry, Nanjing Forestry University, Nanjing 210037, China

Received:2021-05-10 Accepted:2021-09-27 Online:2022-05-30 Published:2022-06-10
Contact: CHEN Xin E-mail:307897100@qq.com;chenxinzhou@hotmail.com

Abstract

Abstract:

【Objective】Reevesia pubescens var. xuefengensis is endemic to China. The study of the population structure and dynamic characteristics, and analyses of the relationship between population and environment is examined, to provide a theoretical basis for the protection and use of R. pubescens var. xuefengensis. 【Method】A typical plot survey method was used to investigate the community of R. pubescens var. xuefengensis, and the DBH, the height and the crown width of each individual in the plot were recorded. According to data obtained from the survey, structure level division and quantity dynamic quantization were carried out. The population dynamics of R. pubescens var. xuefengensis were studied, and its static life table, survival curve, mortality and vanish rate, survival function and time series prediction were analyzed.【Result】The younger individuals in the population were dominant and many of them died while growing to middle-aged. The population had a low anti-disturbance ability and poor stability in the environment. There were three peaks of death recorded, with trends conforming to the Deevey-Ⅱ curve. The dynamic survival characteristics decreased in the early stage, became stable in the middle stage, and declined in the late stage. The result of time series analysis indicated that the number of individuals in the population will increase in the future.【Conclusion】The population in this study area is relatively stable. The population structure will change if the survival rate of the young individuals does not improve and the number of middle individuals cannot be well supplemented. Strengthening protection of the population should be combined with the environment, while reducing the human disturbance and promoting the sustainable development.

Key words: Reevesia pubescens var. xuefengensis, population structure, static life table, quantitative dynamics, survival analysis

CLC Number:

S718.3

WANG Chunhui, CHEN Xin, WANG Benzhong, XU Zhanhong. Population structure and dynamics of Reevesia pubescens var. xuefengensis in the Gaowangjie National Nature Reserve of Hunan Province[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2022, 46(3): 57-64.

Figures/Tables 10

Table 1

Fig.1

Fig.2

Fig.3

Table 2

Table 3

Fig.4

Fig.5

Fig.6

Table 4

Time series analysis of population dynamics of R. pubescens var. xuefengensis"

龄级 age class	原始数量 original quantity	$M 2 (1)$	$M 4 (1)$	$M 6 (1)$	$M 8 (1)$
Ⅰ	52
Ⅱ	46	49
Ⅲ	28	37
Ⅳ	18	23	36
Ⅴ	15	17	27
Ⅵ	6	11	17	28
Ⅶ	8	7	12	20
Ⅷ	5	7	9	13	22
Ⅸ	0	3	5	9	16
Ⅹ	4	2	4	6	11

Table 4

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分(龄)级 class	径级/cm diameter class	高度级/m height class	冠幅级/m² crown width class
Ⅰ	B_D<2(H<1)	H<1.5	C<3
Ⅱ	B_D<2(H≥1)	1.5≤H<3	3≤C<10
Ⅲ	2≤D_BH<5	3≤H<5	10≤C<20
Ⅳ	5≤D_BH<10	5≤H<7	20≤C<30
Ⅴ	10≤D_BH<15	7≤H<9	30≤C<40
Ⅵ	15≤D_BH<20	9≤H<11	40≤C<50
Ⅶ	20≤D_BH<25	11≤H<13	50≤C<60
Ⅷ	25≤D_BH<30	13≤H<15	C≥60
Ⅸ	30≤D_BH<35	H≥15
Ⅹ	D_BH≥35

种群动态指数 population dynamic index	动态指数值/% dynamic index value
V₁	46.97
V₂	54.29
V₃	50.00
V₄	-11.11
V₅	11.11
V₆	-52.94
V₇	-10.52
V₈	78.95
V_pi	37.69
V'_pi	0.52
P_max	1.39

龄级age class	A_x	a_x	l_x	ln l_x	d_x	q_x	L_x	T_x	e_x	K_x
Ⅰ	52	52	1 000	6.908	115	0.115	942	3 029	3.202	0.123
Ⅱ	46	46	885	6.785	346	0.391	712	2 087	2.359	0.496
Ⅲ	28	28	538	6.289	192	0.357	442	1 375	2.554	0.442
Ⅳ	18	18	346	5.847	58	0.167	317	933	2.694	0.182
Ⅴ	15	15	288	5.665	115	0.400	231	615	2.133	0.511
Ⅵ	6	9	173	5.154	38	0.222	154	385	2.222	0.251
Ⅶ	8	7	135	4.902	38	0.286	115	231	1.714	0.336
Ⅷ	5	5	96	4.566	38	0.400	77	115	1.200	0.511
Ⅸ	0	3	58	4.055	38	0.667	38	38	0.667	1.099
Ⅹ	4	1	19	2.957	—	—	—	—	—	—

Population structure and dynamics of Reevesia pubescens var. xuefengensis in the Gaowangjie National Nature Reserve of Hunan Province

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龄级 age class	原始数量 original quantity	$M 2 (1)$	$M 4 (1)$	$M 6 (1)$	$M 8 (1)$
Ⅰ	52
Ⅱ	46	49
Ⅲ	28	37
Ⅳ	18	23	36
Ⅴ	15	17	27
Ⅵ	6	11	17	28
Ⅶ	8	7	12	20
Ⅷ	5	7	9	13	22
Ⅸ	0	3	5	9	16
Ⅹ	4	2	4	6	11

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龄级 age class	原始数量 original quantity	$M 2 (1)$	$M 4 (1)$	$M 6 (1)$	$M 8 (1)$
Ⅰ	52
Ⅱ	46	49
Ⅲ	28	37
Ⅳ	18	23	36
Ⅴ	15	17	27
Ⅵ	6	11	17	28
Ⅶ	8	7	12	20
Ⅷ	5	7	9	13	22
Ⅸ	0	3	5	9	16
Ⅹ	4	2	4	6	11

龄级 age class	原始数量 original quantity	$M 2 (1)$	$M 4 (1)$	$M 6 (1)$	$M 8 (1)$
Ⅰ	52
Ⅱ	46	49
Ⅲ	28	37
Ⅳ	18	23	36
Ⅴ	15	17	27
Ⅵ	6	11	17	28
Ⅶ	8	7	12	20
Ⅷ	5	7	9	13	22
Ⅸ	0	3	5	9	16
Ⅹ	4	2	4	6	11