POPULATION QUANTITATIVE CHARACTERISTICS AND DYNAMICS OF RARE AND ENDANGERED TSUGA TCHEKIANGENSIS IN JIULONGSHAN NATURE RESERVE OF CHINA

doi:10.3773/j.issn.1005-264x.2008.05.019

Abstract

Abstract:

Aims Our objective was to investigate population quantitative characteristics and dynamics of Tsuga tchekiangensis, which is listed as a Chinese national third protective plant with a small geographic distribution in subtropical forests of Jiulongshan Nature Reserve, Zhejiang Province, China.

Methods Ten plots (20 m × 20 m) were investigated along different ridges from low to high altitude. We developed a static life table of T. tchekiangensis population based on the population life table and theory of survival analysis. Survivorship curves, mortality rate, killing power, survival rate, cumulative mortality rate, mortality density and hazard rate were determined, and population dynamics were analyzed using spectral analysis.

Important findings There were abundant young but fewer old individuals. Population structure fluctuated. The survival curve of the population was Deevey type Ⅱ. Two peaks of mortality rate and killing power existed in the lifespan: the 5th and 15th age class periods. The population survival rate of T. tchekiangensis decreased monotonically, whereas the cumulative mortality rate increased monotonically. Meanwhile, the cumulative mortality rate significantly increased during the 13th age class period, up to 98%. Four survival functional curves showed that the T. tchekiangensis population grew stably at young age, decreased very quickly in middle age and declined in old age. Spectral analysis of the population showed that there was a marked periodic fluctuation in the process of natural regeneration.

Key words: population life table, survival curve, survival analysis, spectral analysis, population quantitative dynamics, Tsuga tchekiangensis

ZHANG Zhi-Xiang, LIU Peng, CAI Miao-Zhen, KANG Hua-Jing, LIAO Cheng-Chuan, LIU Chun-Sheng, LOU Zhong-Hua. POPULATION QUANTITATIVE CHARACTERISTICS AND DYNAMICS OF RARE AND ENDANGERED TSUGA TCHEKIANGENSIS IN JIULONGSHAN NATURE RESERVE OF CHINA[J]. Chin J Plant Ecol, 2008, 32(5): 1146-1156.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2008.05.019

https://www.plant-ecology.com/EN/Y2008/V32/I5/1146

Figures/Tables 9

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样地号 No. of plots	海拔 Altitude (m)	坡度 Slope	坡向 Aspect	岩石裸露率 Bareness of rock (%)	郁闭度 Canopy coverage (%)	群落类型 Community type
Q1	1 350	60°	10°NE	30	95	南方铁杉、猴头杜鹃和柳杉林 The mixed stands of Tsuga tchekiangensis, Rhododendron simiarum and Cryptomeria fortunei
Q2	1 410	45°	15°NW	10	85	南方铁杉林 The pure stands of Tsuga tchekiangensis
Q3	1 300	70°	20°NE	50	70	南方铁杉林 The pure stands of Tsuga tchekiangensis
Q4	1 620	60°	10°NW	15	90	南方铁杉和猴头杜鹃林 The mixed stands of Tsuga tchekiangensis and Rhododendron simiarum
Q5	1 550	70°	10°NW	35	90	南方铁杉、猴头杜鹃和木荷林 The mixed stands of Tsuga tchekiangensis, Rhododendron simiarum and Schima superba
Q6	1 400	30°	90°SE	40	70	南方铁杉林 The pure stands of Tsuga tchekiangensis
Q7	1 520	60°	10°SW	10	90	南方铁杉和猴头杜鹃林 The mixed stands of Tsuga tchekiangensis and Rhododendron simiarum
Q8	1 450	65°	20°SW	15	97	南方铁杉、猴头杜鹃和多脉青冈林 The mixed stands of Tsuga tchekiangensis, Rhododendron simiarum and Cyclobalanopsis multiervis
Q9	1 550	55°	20°SW	20	85	南方铁杉和猴头杜鹃林 The mixed stands of Tsuga tchekiangensis and Rhododendron simiarum
Q10	1 340	60°	40°SW	30	85	南方铁杉和猴头杜鹃林 The mixed stands of Tsuga tchekiangensis and Rhododendron simiarum

样地号 No. of plots	海拔 Altitude (m)	坡度 Slope	坡向 Aspect	岩石裸露率 Bareness of rock (%)	郁闭度 Canopy coverage (%)	群落类型 Community type
Q1	1 350	60°	10°NE	30	95	南方铁杉、猴头杜鹃和柳杉林 The mixed stands of Tsuga tchekiangensis, Rhododendron simiarum and Cryptomeria fortunei
Q2	1 410	45°	15°NW	10	85	南方铁杉林 The pure stands of Tsuga tchekiangensis
Q3	1 300	70°	20°NE	50	70	南方铁杉林 The pure stands of Tsuga tchekiangensis
Q4	1 620	60°	10°NW	15	90	南方铁杉和猴头杜鹃林 The mixed stands of Tsuga tchekiangensis and Rhododendron simiarum
Q5	1 550	70°	10°NW	35	90	南方铁杉、猴头杜鹃和木荷林 The mixed stands of Tsuga tchekiangensis, Rhododendron simiarum and Schima superba
Q6	1 400	30°	90°SE	40	70	南方铁杉林 The pure stands of Tsuga tchekiangensis
Q7	1 520	60°	10°SW	10	90	南方铁杉和猴头杜鹃林 The mixed stands of Tsuga tchekiangensis and Rhododendron simiarum
Q8	1 450	65°	20°SW	15	97	南方铁杉、猴头杜鹃和多脉青冈林 The mixed stands of Tsuga tchekiangensis, Rhododendron simiarum and Cyclobalanopsis multiervis
Q9	1 550	55°	20°SW	20	85	南方铁杉和猴头杜鹃林 The mixed stands of Tsuga tchekiangensis and Rhododendron simiarum
Q10	1 340	60°	40°SW	30	85	南方铁杉和猴头杜鹃林 The mixed stands of Tsuga tchekiangensis and Rhododendron simiarum

龄级 Age class	径级 DBH class	组中值 Mean value	a_x	a_x^*	l_x	lnl_x	d_x	q_x	L_x	T_x	e_x	K_x	S_x
1	0~3	1.5	214	189	1 000	6.908	185	0.185	907	3 008	3.008	0.205	0.815
2	3~10	6.5	173	154	815	6.703	185	0.227	722	2 101	2.578	0.258	0.773
3	10~20	15	5	119	630	6.445	185	0.294	537	1 378	2.189	0.348	0.706
4	20~30	25	8	84	444	6.097	185	0.417	352	841	1.893	0.539	0.583
5	30~40	35	17	49	259	5.558	185	0.714	167	496	1.915	1.253	0.286
6	40~50	45	16	14	74	4.305	26	0.357	61	351	4.735	0.442	0.643
7	50~60	55	9	9	48	3.863	0	0.000	48	308	6.466	0.000	1.000
8	60~70	65	1	9	48	3.863	5	0.111	45	261	5.487	0.118	0.889
9	70~80	75	5	8	42	3.745	5	0.125	40	217	5.134	0.134	0.875
10	80~90	85	1	7	37	3.612	5	0.143	34	180	4.850	0.154	0.857
11	90~100	95	1	6	32	3.458	5	0.167	29	145	4.575	0.182	0.833
12	100~110	105	1	5	26	3.275	5	0.200	24	117	4.428	0.223	0.800
13	110~120	115	1	4	21	3.052	5	0.250	19	93	4.410	0.288	0.750
14	120~130	125	0	3	16	2.765	5	0.333	13	75	4.713	0.405	0.667
15	130~140	135	0	2	11	2.359	5	0.500	8	62	5.820	0.693	0.500
16	140~150	145	1	1	5	1.666	-	-	3	54	10.139	1.666	-

龄级 Age class	径级 DBH class	组中值 Mean value	a_x	a_x^*	l_x	lnl_x	d_x	q_x	L_x	T_x	e_x	K_x	S_x
1	0~3	1.5	214	189	1 000	6.908	185	0.185	907	3 008	3.008	0.205	0.815
2	3~10	6.5	173	154	815	6.703	185	0.227	722	2 101	2.578	0.258	0.773
3	10~20	15	5	119	630	6.445	185	0.294	537	1 378	2.189	0.348	0.706
4	20~30	25	8	84	444	6.097	185	0.417	352	841	1.893	0.539	0.583
5	30~40	35	17	49	259	5.558	185	0.714	167	496	1.915	1.253	0.286
6	40~50	45	16	14	74	4.305	26	0.357	61	351	4.735	0.442	0.643
7	50~60	55	9	9	48	3.863	0	0.000	48	308	6.466	0.000	1.000
8	60~70	65	1	9	48	3.863	5	0.111	45	261	5.487	0.118	0.889
9	70~80	75	5	8	42	3.745	5	0.125	40	217	5.134	0.134	0.875
10	80~90	85	1	7	37	3.612	5	0.143	34	180	4.850	0.154	0.857
11	90~100	95	1	6	32	3.458	5	0.167	29	145	4.575	0.182	0.833
12	100~110	105	1	5	26	3.275	5	0.200	24	117	4.428	0.223	0.800
13	110~120	115	1	4	21	3.052	5	0.250	19	93	4.410	0.288	0.750
14	120~130	125	0	3	16	2.765	5	0.333	13	75	4.713	0.405	0.667
15	130~140	135	0	2	11	2.359	5	0.500	8	62	5.820	0.693	0.500
16	140~150	145	1	1	5	1.666	-	-	3	54	10.139	1.666	-

龄级 Age class	径级 DBH class	组中值 Mean value	S₍_i₎	F₍_i₎	f₍_ti₎	λ₍_ti₎
1	0~3	1.5	0.815	0.185	0.062	0.068
2	3~10	6.5	0.630	0.370	0.006	0.037
3	10~20	15	0.444	0.556	0.007	0.034
4	20~30	25	0.259	0.741	0.012	0.053
5	30~40	35	0.074	0.926	0.030	0.111
6	40~50	45	0.048	0.952	0.000	0.000
7	50~60	55	0.048	0.952	0.000	0.000
8	60~70	65	0.042	0.958	0.011	0.012
9	70~80	75	0.037	0.963	0.001	0.013
10	80~90	85	0.032	0.968	0.002	0.015
11	90~100	95	0.026	0.974	0.002	0.018
12	100~110	105	0.021	0.979	0.003	0.022
13	110~120	115	0.016	0.984	0.005	0.029
14	120~130	125	0.011	0.989	0.008	0.040
15	130~140	135	0.005	0.995	0.017	0.067
16	140~150	145	0.000	1.000	0.000	0.000