巴丹吉林沙漠东缘天然梭梭种群结构与动态特征

doi:10.13866/j.azr.2023.06.12

Abstract

Abstract:

The purpose of this study was to analyze the population structure and dynamic characteristics of the natural Haloxylon ammodendron forest in Badain Jaran Desert, revealing the renewal process and future development trend of this Haloxylon species. This work also involved preparation of a static life table, survival rate curves, mortality and disappearing rate curves, population dynamic change index, and a time-series forecasting model. The results showed that: (1) The age structure of this species belongs to the “J” type, with abundant seedlings. (2) The survival curve belongs to the Deevey-II type, and the disappearance and mortality rates have similar trends, both with maximum and minimum values at ages X VII, and IV. (3) The number dynamic change index is greater than 0, indicating that this species has a growing population. (4) The results of time-series prediction analysis showed that the number of individuals will increase. Studies have shown that the natural H. ammodendron population is a stable growing population. In view of the low survival rate of young in this population, it is recommended to manually intervene in the growth of H. ammodendron seedlings to improve their survival rate.

Key words: Haloxylon ammodendron, population, population dynamics, time sequence, Badain Jaran Desert

MAO Mao, MENG Zhongju, DANG Xiaohong, ZHAO Feiyan, WANG Dehui, CHAI Xiangxian. Population dynamics of natural Haloxylon ammodendron in the eastern margin of Badain Jaran Desert[J].Arid Zone Research, 2023, 40(6): 971-978.

Figures/Tables 8

Fig. 1

Fig. 2

Tab. 1

Static life table of Haloxylon ammodendron population"

龄级	径级（DHB）	A_x	a_x	l_x	$l n l x$	d_x	q_x	L_x	T_x	e_x	K_x	S_x
Ⅰ	2 cm≥DHB	303	303	1000	6.91	393	0.39	804	3292	3.29	0.50	0.61
Ⅱ	4 cm≥DHB>2 cm	184	184	607	6.41	79	0.13	568	2488	4.10	0.14	0.87
Ⅲ	6 cm≥DHB>4 cm	160	160	528	6.27	201	0.38	427	1921	3.64	0.48	0.62
Ⅳ	8 cm≥DHB>6 cm	116	99	327	5.79	30	0.09	312	1493	4.57	0.10	0.91
Ⅴ	10 cm≥DHB>8 cm	112	90	297	5.69	30	0.10	282	1182	3.98	0.11	0.90
Ⅵ	12 cm≥DHB>10 cm	62	81	267	5.59	30	0.11	252	899	3.36	0.12	0.89
Ⅶ	14 cm≥DHB>12 cm	66	72	238	5.47	30	0.13	223	647	2.72	0.13	0.88
Ⅷ	16 cm≥DHB>14 cm	51	63	208	5.34	89	0.43	163	424	2.04	0.56	0.57
Ⅸ	18 cm≥DHB>16 cm	36	36	119	4.78	33	0.28	102	261	2.19	0.33	0.72
Ⅹ	20 cm≥DHB>18 cm	26	26	86	4.45	56	0.65	58	158	1.85	1.06	0.35
Ⅺ	22 cm≥DHB>20 cm	9	9	30	3.39	7	0.22	26	101	3.39	0.25	0.78
Ⅻ	24 cm≥DHB>22 cm	7	7	23	3.14	3	0.14	21	74	3.21	0.15	0.86
ⅩⅢ	26 cm≥DHB>24 cm	7	6	20	2.99	3	0.17	18	53	2.67	0.18	0.83
ⅩⅣ	28 cm≥DHB>26 cm	4	5	17	2.80	3	0.20	15	35	2.10	0.22	0.80
ⅩⅤ	30 cm≥DHB>28 cm	6	4	13	2.58	3	0.25	12	20	1.50	0.29	0.75
ⅩⅥ	32 cm≥DHB>30 cm	1	3	10	2.29	7	0.67	7	8	0.83	1.10	0.33
ⅩⅦ	DHB>32 cm	1	1	3	1.19	-	-	2	2	0.5	-

Tab. 1

Fig. 3

Tab. 2

Fig. 4

Tab. 3

Dynamic indices of Haloxylon ammodendron population"

	龄级	指数值	龄级	指数值
$V n$	V_Ⅰ	39.27	V_Ⅹ	65.38
	V_Ⅱ	13.04	V_Ⅺ	22.22
	V_Ⅲ	27.5	V_Ⅻ	0
	V_Ⅳ	3.45	V_ⅩⅢ	42.86
	V_Ⅴ	44.64	V_ⅩⅣ	-33.33
	V_Ⅵ	-6.06	V_ⅩⅤ	83.33
	V_Ⅶ	22.73	V_ⅩⅥ	0
	V_Ⅷ	29.41	V_ⅩⅦ	100
	V_Ⅸ	27.78
$V p i$		0.26
$V p i'$		0.02

Tab. 3

Tab. 4

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模型类型	方程	R²	曲线类型
指数模型	a_x=a₀e^-^bx, a_x=8.8585e^-0.087^x	0.8949	Deevey-Ⅱ型
直线模型	a_x=a₀+bx, y=-0.3342x+7.1017	0.9592
幂函数模型	a_x=a₀x^-^b, a_x=10.254x^-0.473	0.6321

Population dynamics of natural Haloxylon ammodendron in the eastern margin of Badain Jaran Desert

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龄级	初始个体数	M_n
龄级	初始个体数	M₂	M₃	M₄	M₅	M₆	M₇	M₈	M₉	M₁₀
Ⅰ	303
Ⅱ	184	244
Ⅲ	160	172	216
Ⅳ	116	138	153	191
Ⅴ	112	114	129	143	175
Ⅵ	62	87	97	113	127	156
Ⅶ	66	64	80	89	103	117	143
Ⅷ	51	59	60	73	81	95	107	132
Ⅸ	36	44	51	54	65	74	86	98	121
Ⅹ	26	31	38	45	48	59	67	79	90	112
Ⅺ	9	18	24	31	38	42	52	60	71	82
Ⅻ	7	8	14	20	26	33	37	46	54	65
ⅩⅢ	7	7	8	12	17	23	29	33	42	49
ⅩⅣ	4	6	6	7	11	15	20	26	30	38
ⅩⅤ	6	5	6	6	7	10	14	18	24	27
ⅩⅥ	1	4	4	5	5	6	9	12	16	21
ⅩⅦ	1	1	3	3	4	4	5	8	11	15

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