Life table and survival analysis of Loranthus tanakae population in Mount Ziwuling

doi:10.3724/SP.J.1258.2014.00064

Abstract

Abstract:

Aims Loranthus tanakae is a parasitic plant found on Quercus liaotungensis, which is a dominant and constructive tree species in forests of Mount Ziwuling. Our objective was to determine the ecological characteristics of L. tanakae in this region.
Methods In the paper, based on investigations on the age structure of a L. tanakae population, a static life table was constructed, curves of survival, mortality, disappearance rate, and survival function were established, and the dynamics of the L. tanakae population were analyzed.
Important findings The survival curve of the L. tanakae population studied is characterized as the type Deevey II, with relatively stable mortality. The pattern of the disappearance rate curve is similar to that of the morality curve; they both have two peaks: one occurring at the 5th age and the other at the 10th age. A fluctuation occurred in the risk rate curve at the 6th age. The survival curve showed a declining trend while the cumulative morality rate curve displayed an uptrend, and the L. tanakae reached the senescence after the 8th age. According to the age composition of the survival curve, the L. tanakae population studied remained stable in the early and middle stages, but declined in the late stage.

Key words: life table, Loranthus tanakae, population quantity, survival analysis, survival curve

ZHANG Liang, WANG Xiao-An, LIU Peng, WANG Xian, DENG Mei-Jiao, ZHU Yun-Yun. Life table and survival analysis of Loranthus tanakae population in Mount Ziwuling[J]. Chin J Plant Ecol, 2014, 38(7): 687-693.

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URL: https://www.plant-ecology.com/EN/10.3724/SP.J.1258.2014.00064

https://www.plant-ecology.com/EN/Y2014/V38/I7/687

Figures/Tables 7

References 36

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年龄 Age	A_x	a_x	l_x	lnl_x	d_x	q_x	L_x	T_x	e_x	K_x	S_x
1	58	58	1 000	6.908	155	0.155	922	3 862	3.862	0.169	0.845
2	44	49	845	6.739	155	0.184	767	2 940	3.480	0.203	0.816
3	44	40	690	6.536	138	0.200	621	2 172	3.150	0.223	0.800
4	32	32	552	6.313	138	0.250	483	1 552	2.813	0.288	0.750
5	21	24	414	6.025	103	0.250	362	1 069	2.583	0.288	0.750
6	13	18	310	5.738	69	0.222	276	707	2.278	0.251	0.778
7	17	14	241	5.486	69	0.286	207	431	1.786	0.336	0.714
8	3	10	172	5.150	69	0.400	138	224	1.300	0.511	0.600
9	3	6	103	4.639	69	0.667	69	86	0.833	1.099	0.333
10	2	2	34	3.540	34	1.000	17	17	0.500	3.540	0.000

年龄 Age	A_x	a_x	l_x	lnl_x	d_x	q_x	L_x	T_x	e_x	K_x	S_x
1	58	58	1 000	6.908	155	0.155	922	3 862	3.862	0.169	0.845
2	44	49	845	6.739	155	0.184	767	2 940	3.480	0.203	0.816
3	44	40	690	6.536	138	0.200	621	2 172	3.150	0.223	0.800
4	32	32	552	6.313	138	0.250	483	1 552	2.813	0.288	0.750
5	21	24	414	6.025	103	0.250	362	1 069	2.583	0.288	0.750
6	13	18	310	5.738	69	0.222	276	707	2.278	0.251	0.778
7	17	14	241	5.486	69	0.286	207	431	1.786	0.336	0.714
8	3	10	172	5.150	69	0.400	138	224	1.300	0.511	0.600
9	3	6	103	4.639	69	0.667	69	86	0.833	1.099	0.333
10	2	2	34	3.540	34	1.000	17	17	0.500	3.540	0.000

l_x	S₍_i₎	F₍_i₎	F₍_ti₎	λ₍_t₎
1 000	0.845	0.155	0.155	0.168
845	0.690	0.310	0.138	0.185
690	0.552	0.448	0.138	0.222
552	0.414	0.586	0.103	0.295
414	0.310	0.690	0.069	0.286
310	0.241	0.759	0.069	0.222
241	0.172	0.828	0.069	0.333
172	0.103	0.897	0.069	0.500
103	0.034	0.966	0.034	1.000
34	0.000	1.000	0.000	2.000

l_x	S₍_i₎	F₍_i₎	F₍_ti₎	λ₍_t₎
1 000	0.845	0.155	0.155	0.168
845	0.690	0.310	0.138	0.185
690	0.552	0.448	0.138	0.222
552	0.414	0.586	0.103	0.295
414	0.310	0.690	0.069	0.286
310	0.241	0.759	0.069	0.222
241	0.172	0.828	0.069	0.333
172	0.103	0.897	0.069	0.500
103	0.034	0.966	0.034	1.000
34	0.000	1.000	0.000	2.000