Morphological characteristics and influencing mechanisms of Nitraria tangutorum nebkhas at different sandy land types in desert oasis ecotone of Jilantai

doi:10.12302/j.issn.1000-2006.202108028

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (5): 172-180.doi: 10.12302/j.issn.1000-2006.202108028

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Morphological characteristics and influencing mechanisms of Nitraria tangutorum nebkhas at different sandy land types in desert oasis ecotone of Jilantai

WEI Yajuan¹^,²(), GUO Jing³, DANG Xiaohong²^,⁴^,^*(), Xie Yunhu¹, WANG Ji², LI Xiaole², WU Huimin²

1. Department of Resource and Environment,Baotou Teachers’ College, Baotou 014030, China
2. College of Desert Control Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
3. Inner Mongolia Baotou Steel Rare Earth Steel Plate Co., Ltd.,Baotou 014010, China
4. Baotou Forestry and Grassland Bureau, Baotou 014010, China

Received:2021-08-15 Revised:2022-11-27 Online:2023-09-30 Published:2023-10-10

Abstract

Abstract:

【Objective】 Nitraria tangutorum nebkhas are the first ecological line of defense in the desert-oasis ecotone of Jilantai. The formation and evolution of these nebkhas are important for oasis wind prevention and sand fixation. 【Method】In this study, the morphological and growth characteristics of N. tangutorum nebkhas in different sand types (shifting sandy land, semi-fixed sandy land and fixed sandy land) were systematically determined using typical quadrat sampling methods. 【Result】The morphology of N. tangutorum nebkhas was mainly elliptical. The length (L), width (W), height (h), horizontal scale (D), bottom area (A) and volume (V) of N. tangutorum nebkhas were significantly higher in semi-fixed and fixed sandy lands than in shifting sandy land (P<0.05). For the morphological parameters of N. tangutorum nebkhas, there was a highly significant linear relationship between L and W in the three sandy lands. However, quadratic functional relationships were observed between D and H, A and H, V and H, and A and V in N. tangutorum. Vegetation coverage (C), shrub height (h), and branch density (M) of N. tangutorum nebkhas in semi-fixed and fixed sandy lands were significantly higher than those in shifting sandy lands (P<0.05). Compared to shifting sandy lands, C of N. tangutorum nebkhas in semi-fixed and fixed sandy lands increased by 62.35% and 51.08% (P<0.05), shrub height (h) increased by 35.84% and 38.51% (P<0.05), and M increased by 61.58% and 72.77% (P<0.05), respectively. 【Conclusion】The sand fixation capacity of N. tangutorum nebkhas was higher with the fixation of sandy lands. N. tangutorum shrubs grew well and the regeneration ability increased gradually with the fixation of sandy lands.

Key words: Nitraria tangutorum nebkha, morphological characteristics, growth characteristics, desert-oasis ecotone, Jilantai

CLC Number:

Q948

WEI Yajuan, GUO Jing, DANG Xiaohong, Xie Yunhu, WANG Ji, LI Xiaole, WU Huimin. Morphological characteristics and influencing mechanisms of Nitraria tangutorum nebkhas at different sandy land types in desert oasis ecotone of Jilantai[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2023, 47(5): 172-180.

Figures/Tables 7

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沙地类型 sandy land type	经纬度 latitude and longitude	海拔/m altitude	植被盖度/% vegetation coverage	土壤类型 soil type	伴生种 associated species
流动沙地 shifting sandy land	105°43'12″E, 39°48'48″N	999	9.83	风沙土、硬质钙积层	沙蓬(Agriophyllum squarrosum)、猪毛菜(Kali collinum)
半固定沙地 semi-fixed sandy land	105°43'17″E, 39°48'40″N	983	21.15	风沙土、硬质钙基层	沙拐枣(Calligonum mongolicum)、梭梭(Haloxylon ammodendron)、沙蒿(Artemisia desertorum)、沙米
固定沙地 fixed sandy land	105°43'28″E, 39°48'21″N	972	55.43	风沙土	芨芨草(Neotrinia splendens)、芦苇(Phragmites australlis)、苦豆子(Sophora alopecuroides)

形态参数 morphological characteristics	流动沙地(n=60) shifting sandy land				半固定沙地(n=79) semi-fixed sandy land				固定沙地(n=100) fixed sandy land
形态参数 morphological characteristics	max	min	MS±SE	CV	max	min	MS±SE	CV	max	min	MS±SE	CV
L/m	7.38	3.01	4.76±1.05 b	0.22	17.07	3.76	7.78±2.42 a	0.30	16.87	4.14	7.83±2.25 a	0.29
W/m	7.16	2.11	4.01±1.00 b	0.25	11.55	2.70	5.76±1.54 a	0.28	11.83	2.86	5.64±1.43 a	0.25
H/m	0.99	0.38	0.62±0.13 b	0.20	2.40	0.47	1.23±0.42 a	0.30	2.62	0.57	1.34±0.36 a	0.27
D/m	7.27	2.56	4.39±0.99 b	0.23	11.80	3.23	6.77±1.76 a	0.27	12.62	3.98	6.73±1.66 a	0.25
A/m²	11.41	4.02	6.89±1.55 b	0.23	18.53	5.07	10.63±2.77 a	0.27	19.82	6.24	10.57±2.61a	0.25
V/m³	27.29	1.27	7.12±3.74 b	0.67	174.86	2.51	34.94±21.98 a	0.93	195.90	4.67	37.91±24.77a	0.92
L/W	1.77	1.01	1.21±0.17 a	0.14	3.09	1.01	1.38±0.38 a	0.28	3.89	1.00	1.42±0.41 a	0.29
H/L	0.15	0.11	0.13±0.01 c	0.06	0.20	0.11	0.16±0.03 b	0.16	0.21	0.11	0.17±0.02 a	0.10
H/W	0.20	0.14	0.16±0.01 c	0.08	0.40	0.14	0.21±0.05 b	0.18	0.50	0.14	0.24±0.04 a	0.18

沙地类型 sandy land types	沙堆高 height of nebkhas		沙堆底面积 bottom area of nebkhas		沙堆体积 volume of nebkhas
沙地类型 sandy land types	H/m	频率/% frequency	A/m²	频率/% frequency	V/m³	频率/% frequency
流动沙地 (n=60) shifting sandy land	<1	100	<10	100	<10	100
	[1,2)	0	[10,20)	0	[10,20)	0
	[2,3)	0	[20,30)	0	[20,30)	0
	[3,4)	0	≥30	0	≥30	0
半固定沙地 (n=79) semi-fixed sandy land	<1	30.38	<10	44.30	<10	11.39
	[1,2)	64.56	[10,20)	55.70	[10,20)	27.85
	[2,3)	5.06	[20,30)	0	[20,30)	21.52
	[3,4)	0	≥30	0	≥30	39.24
固定沙地 (n=100) fixed sandy land	<1	20.00	<10	45.00	<10	15.00
	[1,2)	76.00	[10,20)	55.00	[10,20)	20.00
	[2,3)	4.00	[20,30)	0	[20,30)	16.00
	[3,4)	0	≥30	0	≥30	49.00

沙地类型 sandy land types	形态参数 morphological parameters	L	W	L/W	H	D	A	V	H/L	H/W
流动沙地 shifting sandy land (n=60)	L	1.000
	W	0.862^**	1.000
	L/W	0.038	-0.457^**	1.000
	H	0.967^**	0.963^**	-0.211	1.000
	D	0.967^**	0.963^**	-0.210	1.000^**	1.000
	A	0.967^**	0.963^**	-0.210	1.000^**	1.000^**	1.000
	V	0.922^**	0.942^**	-0.216	0.962^**	0.966^**	0.966^**	1.000
	H/L	0.407^**	0.097	-0.917^**	-0.167	-0.167	-0.167	-0.135	1.000
	H/W	-0.205	-0.654^**	0.970^**	-0.440^**	-0.439^**	-0.439^**	-0.425^**	-0.798^**	1.000
半固定沙地 semi-fixed sandy land (n=79)	L	1.000
	W	0.584^**	1.000
	L/W	0.626^**	-0.251	1.000
	H	0.902^**	0.740^**	0.373^**	1.000
	D	0.935^**	0.834^**	0.315^*	0.937^**	1.000
	A	0.935^**	0.834^**	0.315^*	0.937^**	1.000^**	1.000
	V	0.846^**	0.809^**	0.241	0.924^**	0.929^**	0.929^**	1.000
	H/L	0.215	0.503^**	-0.206	0.598^**	0.366^**	0.366^**	0.450^**	1.000
	H/W	0.700^**	0.005	0.845^**	0.665^**	0.478^**	0.478^**	0.450^**	0.340^**	1.000
固定沙地 fixed sandy land (n=100)	L	1.000
	W	0.668^**	1.000
	L/W	0.452^**	-0.313^**	1.000
	H	0.927^**	0.838^**	0.176	1.000
	D	0.946^**	0.874^**	0.159	0.972^**	1.000
	A	0.946^**	0.874^**	0.159	0.972^**	1.000^**	1.000
	V	0.878^**	0.844^**	0.089	0.908^**	0.943^**	0.943^**	1.000
	H/L	-0.061	0.443^**	-0.571^**	0.302^**	0.154	0.154	0.124	1.000
	H/W	0.532^**	-0.145	0.893^**	0.392^**	0.284^**	0.284^**	0.185	-0.165	1.000

Morphological characteristics and influencing mechanisms of Nitraria tangutorum nebkhas at different sandy land types in desert oasis ecotone of Jilantai

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