Age structure and dynamic analysis of Amygdalus ledebouriana population in Xinjiang, China

doi:10.17521/cjpe.2022.0396

Abstract

Abstract:

Aims Taking the population of Amygdalus ledebouriana in Balruk Mountain of Xinjiang as the research object, through the investigation of the natural population of A. ledebouriana in Xinjiang, and to provide a certain theory and research basis for the conservation, management and restoration of A. ledebourianapopulation.

Methods The population of A. ledebouriana was investigated and counted by typical sample method. The static life table of A. ledebourianapopulation was compiled using “space substitution time” and uniform sliding technologies, and thus the dynamic change of the population number was analyzed.

Important findings 1) The number of individuals in the III age class of A. ledebourianapopulation in Xinjiang was the largest, accounting for 19.19% of the total individual number. The number of individual plants in the population increased first and then decreased with the increase of age class. The diameter class structure of the population was “spindle”. The age structure of A. ledebourianapopulation in Xinjiang belongs to the recession type. 2) The survival curve of A. ledebouriana was close to the distribution of Deevey-II, and the death peak of the population appeared in the VIII age class, with a mortality rate of 58%. 3) Dynamic change index (V_pi), dynamic change index under external disturbance (V′_pi) of A. ledebouriana population > 0, but V'_pi was close to 0, and the maximum risk probability in random disturbance (P_max) of the population under external environmental interference was 0.38%, indicating that the growth trend of the population was not obvious when it was randomly disturbed by the outside world. 4) After 2, 3, 4, 5, 6, 7, 8, 9 and 10 age classes in the future, the number of young and middle-aged individuals gradually decreases, and the elderly individuals dominate. The lack of seedlings in young individuals is one of the main reasons for the decline of A. ledebouriana population in Xinjiang. Therefore, in order to ensure the normal regeneration of A. ledebouriana population, it is very important to adopt some valid measures, for example, increase the research in the regeneration of A. ledebouriana seedlings in the future, including properly carrying out artificial tending, and protect the A. ledebouriana population by closing the mountains and raising forests in Xinjiang.

Key words: Amygdalus ledebouriana, population age structure, static life table, survival curve, dynamic analysis

GUAN Yue, WANG Yan-Xin, CHU Jia-Yao, FENG Lin-Jiao, SONG Xiao-Meng, ZHOU Long. Age structure and dynamic analysis of Amygdalus ledebouriana population in Xinjiang, China[J]. Chin J Plant Ecol, 2023, 47(7): 967-977.

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Figures/Tables 11

References 38

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分布区域 Distribution area	样地编号 Plot No.	经纬度 Latitude and longitude	坡度 Slope (°)	坡向 Aspect	海拔 Altitude (m)	幼苗数量 Seedling number
托里县 Tuoli County	A	46.93° N, 83.33° E	32	185°	815	3
	B	46.91° N, 83.32° E	29	28°	879	59
	C	46.95° N, 83.34° E	34	12°	867	16
	D	46.84° N, 83.32° E	38	294°	961	20
	E	46.84° N, 83.33° E	22	192°	902	5
	F	46.96° N, 83.35° E	26	123°	927	24
	G	46.97° N, 83.31° E	20	73°	881	24
	H	46.93° N, 83.37° E	0	-	820	12
	I	46.98° N, 83.36° E	20	210°	792	1
	J	46.92° N, 83.38° E	21	253°	805	0
	K	46.85° N, 83.31° E	26	135°	933	33
	L	46.84° N, 83.34° E	30	55°	979	65
	M	46.83° N, 83.39° E	14	228°	973	36
	N	46.82° N, 83.37° E	13	106°	940	70
	O	46.85° N, 83.38° E	0	-	920	63
	P	46.84° N, 83.35° E	18	355°	949	23
	Q	46.86° N, 83.36° E	19	175°	911	28
	R	46.79° N, 83.32° E	17	285°	954	95
	S	46.78° N, 83.33° E	23	311°	960	30
裕民县 Yumin County	T	45.53° N, 82.31° E	30	25°	1 270	0
裕民县 Yumin County	U	45.54° N, 82.30° E	0	-	1 230	0

分布区域 Distribution area	样地编号 Plot No.	经纬度 Latitude and longitude	坡度 Slope (°)	坡向 Aspect	海拔 Altitude (m)	幼苗数量 Seedling number
托里县 Tuoli County	A	46.93° N, 83.33° E	32	185°	815	3
	B	46.91° N, 83.32° E	29	28°	879	59
	C	46.95° N, 83.34° E	34	12°	867	16
	D	46.84° N, 83.32° E	38	294°	961	20
	E	46.84° N, 83.33° E	22	192°	902	5
	F	46.96° N, 83.35° E	26	123°	927	24
	G	46.97° N, 83.31° E	20	73°	881	24
	H	46.93° N, 83.37° E	0	-	820	12
	I	46.98° N, 83.36° E	20	210°	792	1
	J	46.92° N, 83.38° E	21	253°	805	0
	K	46.85° N, 83.31° E	26	135°	933	33
	L	46.84° N, 83.34° E	30	55°	979	65
	M	46.83° N, 83.39° E	14	228°	973	36
	N	46.82° N, 83.37° E	13	106°	940	70
	O	46.85° N, 83.38° E	0	-	920	63
	P	46.84° N, 83.35° E	18	355°	949	23
	Q	46.86° N, 83.36° E	19	175°	911	28
	R	46.79° N, 83.32° E	17	285°	954	95
	S	46.78° N, 83.33° E	23	311°	960	30
裕民县 Yumin County	T	45.53° N, 82.31° E	30	25°	1 270	0
裕民县 Yumin County	U	45.54° N, 82.30° E	0	-	1 230	0

龄级 Age class	I	II	III	IV	V	VI	VII	VIII	IX	X	XI	XII	XIII
a_x	465	620	1 065	865	760	655	525	275	115	95	55	35	20
a_x'	965	860	794	708	622	556	450	275	115	95	55	35	20

龄级 Age class	I	II	III	IV	V	VI	VII	VIII	IX	X	XI	XII	XIII
a_x	465	620	1 065	865	760	655	525	275	115	95	55	35	20
a_x'	965	860	794	708	622	556	450	275	115	95	55	35	20

x	基径 BD (cm)	a_x	a_x'	l_x	d_x	q_x	L_x	T_x	e_x	lnl_x	lna_x	K_x	S_x
I	BD ≤ 0.3	465	965	1 000.00	108.81	0.11	945.60	5 240.93	5.24	6.91	6.87	0.12	0.89
II	0.3 < BD ≤ 0.6	620	860	891.19	68.39	0.08	856.99	4 295.34	4.82	6.79	6.76	0.08	0.92
III	0.6 < BD ≤ 0.9	1 065	794	822.80	89.12	0.11	778.24	3 438.34	4.18	6.71	6.68	0.11	0.89
IV	0.9 < BD ≤ 1.2	865	708	733.68	89.12	0.12	689.12	2 660.10	3.63	6.60	6.56	0.13	0.88
V	1.2 < BD ≤ 1.5	760	622	644.56	68.39	0.11	610.36	1 970.98	3.06	6.47	6.43	0.11	0.89
VI	1.5 < BD ≤ 1.8	655	556	576.17	109.84	0.19	521.24	1 360.62	2.36	6.36	6.32	0.21	0.81
VII	1.8 < BD ≤ 2.1	525	450	466.32	181.35	0.39	375.65	839.38	1.80	6.14	6.11	0.49	0.61
VIII	2.1 < BD ≤ 2.4	275	275	284.97	165.80	0.58	202.07	463.73	1.63	5.65	5.62	0.87	0.42
IX	2.4 < BD ≤ 2.7	115	115	119.17	20.73	0.17	108.81	261.66	2.20	4.78	4.74	0.19	0.83
X	2.7 < BD ≤ 3.0	95	95	98.45	41.45	0.42	77.72	152.85	1.55	4.59	4.55	0.55	0.58
XI	3.0 < BD ≤ 3.3	55	55	56.99	20.73	0.36	46.63	75.13	1.32	4.04	4.01	0.45	0.64
XII	3.3 < BD ≤ 3.6	35	35	36.27	15.54	0.43	28.50	28.50	0.79	3.59	3.56	0.56	0.57
XIII	BD > 3.6	20	20	20.73	-	0.00	-	-	-	3.03	3.00	-	-