Effects of different habitats on the diversity and biomass of ground moss in the southeast Xizang, China

doi:10.17521/cjpe.2021.0114

Abstract

Abstract:

Aims In order to explore the important ecological function of moss in forest ecosystems in the southeast Xizang and provide a theoretical basis for the influence of forest disturbance on forest surface vegetation, the diversity and biomass characteristics of ground moss per unit area in different habitats in the Sygera Mountain of southeast Xizang.

Methods We collected the surface moss in the Sygera Mountain of the southeast Xizang as the investigation object, and selected 7 sample plots with similar forest stand, slope direction, slope and terrain composition, with each plot size of 100 m × 100 m. We took canopy gap of each sample plot as the center, and three different habitats (canopy gap, forest edge and understory) were selected in four directions to set 50 cm × 50 cm quadrats, with 12 quadrats for each sample plot and 168 quadrats in total. Moss survey and collection were carried out in each quadrat.

Important findings (1) 24 families, 63 genera and 110 species of moss were found in the study area, in which there were 8 dominant families, which were Pottiaceae, Dicranaceae, Polytrichaceae, Mniaceae, Bryaceae, Grimmiaceae, Brachytheciaceae and Hypnaceae. There were obvious distribution rules of different moss families, such as Dicranaceae and Bryaceae were widely distributed at all elevations, and Polytrichaceae, Bryaceae and Mniaceae were distributed at altitudes from 3 700 to 4 300 m. Most of Pottiaceae were distributed over 4 300 m. (2) The habitat of canopy gap was more complex than those of forest edge and understory and it interfered with moss composition and community structure, in which the moss community had the most species and the most complex structure. However, the moss community in understory had the least species and the simplest structure. The biomass of ground moss was the highest in the gap, followed by the edge and the lowest in the understory. (3) The biomass of ground moss was not only affected by species composition, coverage, body shape and community structure, but also resulted from the interaction of many factors rather than any one single factor.

Key words: canopy gap, biomass, biodiversity, ground mosses, Xizang

MA He-Ping, WANG Rui-Hong, QU Xing-Le, YUAN Min, MU Jin-Yong, LI Jin-Hang. Effects of different habitats on the diversity and biomass of ground moss in the southeast Xizang, China[J]. Chin J Plant Ecol, 2022, 46(5): 552-560.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2021.0114

https://www.plant-ecology.com/EN/Y2022/V46/I5/552

Figures/Tables 6

References 30

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样地 Sampling site	海拔 Altitude (m)	群落类型 Community type	林窗 Forest gap		物种组成 Species composition
样地 Sampling site	海拔 Altitude (m)	群落类型 Community type	面积 Area (m²)	年龄 Age (a)	乔木层 Overstory	下木层 Understory
A₁	4 400	高山灌丛 Alpine shrub	10	>40	1	8, 9, 10, 11, 12, 13, 37, 38, 39, 41, 43
A₂	4 370	高山灌丛 Alpine shrub	14	>40	1, 2, 3, 4, 5, 6, 7	8, 10, 12, 14, 11, 8, 13, 38, 39, 41, 43
A₃	4 212	方枝柏-杜鹃 Sabina saltuarica-Rhododendron sp.	40	>40	1, 2, 3, 4, 5, 6, 7	6, 9, 12, 13, 15, 20, 28, 29, 39, 40, 42, 43
A₄	4 120	杜鹃 Rhododendron sp.	60	>30	1, 2, 3, 4, 5, 6, 7	9, 12, 13, 14, 15, 16, 17, 22, 24, 27, 32, 33, 39, 40, 42, 43, 45
A₅	4 014	急尖长苞冷杉 Abies georgei var. smithii	120	>30	1, 2, 3, 4, 5, 6, 7	12, 13, 14, 19, 20, 21, 23, 24, 28, 29, 33, 34, 35, 36, 39, 40, 42, 43
A₆	3 880	急尖长苞冷杉 Abies georgei var. smithii	300	>60	3, 5, 15, 16, 17	18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 31, 32, 39, 40, 42, 43, 44
A₇	3 740	急尖长苞冷杉 Abies georgei var. smithii	50	>40	3, 5, 6, 16, 17	9, 19, 20, 26, 29, 33, 36, 39, 40, 42, 43, 44, 45

样地 Sampling site	海拔 Altitude (m)	群落类型 Community type	林窗 Forest gap		物种组成 Species composition
样地 Sampling site	海拔 Altitude (m)	群落类型 Community type	面积 Area (m²)	年龄 Age (a)	乔木层 Overstory	下木层 Understory
A₁	4 400	高山灌丛 Alpine shrub	10	>40	1	8, 9, 10, 11, 12, 13, 37, 38, 39, 41, 43
A₂	4 370	高山灌丛 Alpine shrub	14	>40	1, 2, 3, 4, 5, 6, 7	8, 10, 12, 14, 11, 8, 13, 38, 39, 41, 43
A₃	4 212	方枝柏-杜鹃 Sabina saltuarica-Rhododendron sp.	40	>40	1, 2, 3, 4, 5, 6, 7	6, 9, 12, 13, 15, 20, 28, 29, 39, 40, 42, 43
A₄	4 120	杜鹃 Rhododendron sp.	60	>30	1, 2, 3, 4, 5, 6, 7	9, 12, 13, 14, 15, 16, 17, 22, 24, 27, 32, 33, 39, 40, 42, 43, 45
A₅	4 014	急尖长苞冷杉 Abies georgei var. smithii	120	>30	1, 2, 3, 4, 5, 6, 7	12, 13, 14, 19, 20, 21, 23, 24, 28, 29, 33, 34, 35, 36, 39, 40, 42, 43
A₆	3 880	急尖长苞冷杉 Abies georgei var. smithii	300	>60	3, 5, 15, 16, 17	18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 31, 32, 39, 40, 42, 43, 44
A₇	3 740	急尖长苞冷杉 Abies georgei var. smithii	50	>40	3, 5, 6, 16, 17	9, 19, 20, 26, 29, 33, 36, 39, 40, 42, 43, 44, 45

编号 No.	科 Family	属数 Genus number	种数 Species number
1	真藓科 Bryaceae	5	19
2	提灯藓科 Mniaceae	3	12
3	曲尾藓科 Dicranaceae	7	10
4	青藓科 Brachytheciaceae	4	10
5	丛藓科 Pottiaceae	8	8
6	金发藓科 Polytrichaceae	4	8
7	紫萼藓科 Grimmiaceae	3	8
8	灰藓科 Hypnaceae	5	6
总计 Total		39	81

编号 No.	科 Family	属数 Genus number	种数 Species number
1	真藓科 Bryaceae	5	19
2	提灯藓科 Mniaceae	3	12
3	曲尾藓科 Dicranaceae	7	10
4	青藓科 Brachytheciaceae	4	10
5	丛藓科 Pottiaceae	8	8
6	金发藓科 Polytrichaceae	4	8
7	紫萼藓科 Grimmiaceae	3	8
8	灰藓科 Hypnaceae	5	6
总计 Total		39	81

样地 Sample plot	特征 Characteristic	林窗 Canopy gap (g·m^-2)	林缘 Forest edge (g·m^-2)	林下 Understory (g·m^-2)
A1	变幅 Amplitude	6.61-32.59	29.5-245.61	32.62-187.98
	平均值 Average	26.44	118.00	130.48
	中位值 Median value	23.58	104.75	120.61
	标准差 Standard deviation	9.05	43.56	44.63
	变异系数 Coefficient of variation	34.22	36.92	34.20
A2	变幅 Amplitude	43.62-216.06	16.63-93.84	13.16-111.24
	平均值 Average	174.48	66.52	52.64
	中位值 Median value	140.53	52.87	46.63
	标准差 Standard deviation	62.37	19.48	22.88
	变异系数 Coefficient of variation	35.74	29.28	43.47
A3	变幅 Amplitude	49.49-276.15	72.34-384.38	48.15-313.4
	平均值 Average	197.96	289.36	192.69
	中位值 Median value	178.32	264.38	167.63
	标准差 Standard deviation	71.35	97.07	54.29
	变异系数 Coefficient of variation	36.04	33.54	28.17
A4	变幅 Amplitude	30.62-184.43	98.72-486.91	29.93-197.85
	平均值 Average	122.48	394.88	119.72
	中位值 Median value	101.33	378.42	102.59
	标准差 Standard deviation	42.59	162.21	55.69
	变异系数 Coefficient of variation	34.77	41.07	46.51
A5	变幅 Amplitude	174.21-864.75	37.53-218.89	35.38-210.34
	平均值 Average	696.84	150.12	141.52
	中位值 Median value	637.39	139.84	132.47
	标准差 Standard deviation	275.08	63.51	72.23
	变异系数 Coefficient of variation	39.48	42.30	51.04
A6	变幅 Amplitude	59.33-328.73	202.28-354.87	40.61-287.98
	平均值 Average	237.32	202.28	162.44
	中位值 Median value	223.47	197.38	153.77
	标准差 Standard deviation	76.56	74.68	87.57
	变异系数 Coefficient of variation	32.26	36.91	53.91
A7	变幅 Amplitude	60.37-364.23	61.49-386.88	155.25-887.53
	平均值 Average	241.48	247.76	621.00
	中位值 Median value	234.23	235.11	594.55
	标准差 Standard deviation	79.75	102.58	284.44
	变异系数 Coefficient of variation	33.03	41.40	45.80