新疆甘家湖梭梭林国家级自然保护区植被群落多样性及空间分布格局

doi:10.12118/j.issn.1000-6060.2024.133

Abstract

Abstract:

The Ganjiahu Saxoul National Nature Reserve in Xinjiang, China, is situated in a typical oasis-desert transition zone. Clearly identifying the main vegetation types and their distribution within the reserve is essential for biodiversity protection and restoration. Based on remote sensing images from 2022, a field survey was conducted in August 2023. Vegetation samples from the Ganjiahu Saxoul National Nature Reserve were classified using the two-way indicator species analysis (TWINSPAN) method. Alpha diversity indices of each vegetation type were calculated, followed by the development of a random forest model to evaluate and visualize the clustering results of vegetation quadrats. The results are as follows: (1) In the Ganjiahu Saxoul National Nature Reserve, the dominant herbaceous plants are primarily Salsola spp., while the principal shrubs include Haloxylon ammodendron, Suaeda spp., Reaumuria songarica, and Ceratocarpus arenarius. (2) Sixty-two vegetation sample plots were categorized into 14 types in TWINSPAN. Among these, the Ass. Salsola spp.+Suaeda spp. (G5) covered the largest area and exhibited the highest vegetation diversity. The Ass. Salsola spp. + Ceratocarpus arenarius (G7) showed both high species diversity and extensive coverage. The G14 type represented a single vegetation community with the lowest Shannon-Wiener and Simpson’s diversity indices and had a Pielou’s evenness index of 1, predominantly comprising farmland and highly saline bare land in the Ganjiahu Saxoul National Nature Reserve. (3) The random forest model achieved an overall accuracy of 87.10%, with a Kappa coefficient of 0.8553, and demonstrated relatively low commission and omission errors. (4) H. ammodendron and H. persicum are mainly distributed in the core area in the northwest and the buffer zone extending from the central to southern parts of the Ganjiahu Saxoul National Nature Reserve. These findings provide a foundation for future precise management of the Ganjiahu Saxoul National Nature Reserve.

Key words: vegetation types, spatial distribution, two-way indicator species analysis method, species diversity, random forest

WANG Anqi, ZHANG Yu, LIU Jiawei, ZHAO Wei, LIU Xinyu, LI Kai. Vegetation community diversity and spatial distribution pattern in Ganjiahu Saxoul National Nature Reserve, Xinjiang[J].Arid Land Geography, 2024, 47(11): 1841-1851.

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References 39

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序号	植物种类	拉丁学名	平均高度/cm	平均盖度/%	平均重要值
1	猪毛菜属	Salsola spp.	12.49	9.80	31.02
2	梭梭	Haloxylon ammodendron	195.74	42.39	9.70
3	碱蓬属	Suaeda spp.	30.24	17.26	8.27
4	芦苇	Phragmites australis	45.59	8.29	6.68
5	红砂	Reaumuria songarica	49.53	19.66	4.88
6	角果藜	Ceratocarpus arenarius	6.66	7.80	4.67
7	多枝柽柳	Tamarix ramosissima	166.40	54.40	4.44
8	蒿属	Artemisia spp.	42.52	23.87	4.40
9	盐节木	Halocnemum strobilaceum	19.85	27.46	4.33
10	戈壁藜	Iljinia regelii	31.83	6.78	3.30
11	黑果枸杞	Lycium ruthenicum	23.13	19.88	3.23
12	白梭梭	Haloxylon persicum	131.08	25.96	2.99
13	骆驼刺	Alhagi camelorum	41.89	14.33	2.45
14	花花柴	Karelinia caspia	39.00	5.55	1.26
15	小果白刺	Nitraria sibirica	30.38	26.50	1.11
16	胡杨	Populus euphratica	235.00	45.00	0.93
17	驼绒藜	Krascheninnikovia ceratoides	53.11	13.89	0.75
18	铃铛刺	Caragana halodendron	133.00	33.40	0.73
19	沙拐枣属	Calligonum spp.	37.60	17.40	0.72
20	盐爪爪	Kalidium foliatum	29.60	9.00	0.66
21	盐穗木	Halostachys caspica	78.75	47.00	0.45
22	雾冰藜	Grubovia dasyphylla	3.00	1.67	0.44
23	抱茎独行菜	Lepidium perfoliatum	41.00	9.17	0.39
24	大叶补血草	Limonium gmelinii	51.83	9.67	0.38
25	芨芨草	Neotrinia splendens	78.75	18.25	0.36
26	甘草	Glycyrrhiza uralensis	25.00	20.00	0.28
27	白麻	Apocynum pictum	90.00	17.00	0.26
28	东方旱麦草	Eremopyrum orientale	8.00	10.00	0.24
29	沙蓬	Agriophyllum pungens	29.50	3.00	0.20
30	蓝刺头	Echinops sphaerocephalus	16.00	1.50	0.18
31	肉苁蓉	Cistanche deserticola	18.00	1.00	0.13
32	盐生假木贼	Anabasis salsa	13.50	4.00	0.13
33	荠	Capsella bursa-pastoris	6.00	1.00	0.04

群丛编号	样方数量	Shannon-Wiener 多样性指数	Simpson优势度	Pielou均匀度指数
G1	4	1.354	0.594	0.565
G2	4	1.643	0.745	0.685
G3	2	1.475	0.652	0.640
G4	5	1.661	0.774	0.668
G5	10	1.864	0.798	0.645
G6	3	1.437	0.727	0.739
G7	4	1.748	0.792	0.703
G8	1	1.304	0.700	0.810
G9	13	1.339	0.664	0.558
G10	2	1.409	0.716	0.677
G11	4	1.593	0.760	0.641
G12	4	1.782	0.775	0.658
G13	3	1.305	0.706	0.729
G14	3	0.693	0.500	1.000

群丛编号	面积/km²	面积占比/%	生产者精度/%	使用者精度/%
G1	28.50	4.64	75.00	100.00
G2	116.15	18.91	100.00	80.00
G3	18.45	3.00	100.00	100.00
G4	59.31	9.66	60.00	75.00
G5	124.87	20.33	90.00	69.23
G6	26.07	4.25	100.00	100.00
G7	83.71	13.63	100.00	100.00
G8	2.84	0.46	100.00	100.00
G9	81.26	13.23	84.62	91.67
G10	6.63	1.08	100.00	66.67
G11	17.05	2.78	100.00	100.00
G12	1.72	0.28	75.00	100.00
G13	32.28	5.26	100.00	100.00
G14	15.39	2.51	66.67	100.00

Vegetation community diversity and spatial distribution pattern in Ganjiahu Saxoul National Nature Reserve, Xinjiang

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