Composition and spatio-temporal distribution of tree seedlings in an evergreen broad-leaved forest in the Ailao Mountains, Yunnan

doi:10.3724/SP.J.1003.2011.07010

Abstract

Abstract:

Ailao Mountain National Nature Reserve covers 504 km² and is one of the largest tracts of evergreen broad-leaved forests in China. A 6-ha plot was established in the reserve in 2008 by Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, for the purpose of monitoring long-term dynamics of the forest. Tree seedlings were sampled in this plot to understand their composition and spatio-temporal distribution. Five of the top 10 seedling species in terms of importance values were the same as 5 of the top 10 adult tree species with the highest importance values. Both abundance and species richness of tree seedlings dropped between the end of the rainy season and the end of dry season, likely due to drought stress. Seedlings in canopy gaps were richer in species, more abundant in terms of density, and experienced lower mortality compared with those under the forest canopy, suggesting that forest gaps facilitate the recruitment of seedlings in the forest.

Key words: drought stress, forest gap, survival, regeneration

Hede Gong, Guoping Yang, Zhiyun Lu, Yuhong Liu, Min Cao. Composition and spatio-temporal distribution of tree seedlings in an evergreen broad-leaved forest in the Ailao Mountains, Yunnan[J]. Biodiv Sci, 2011, 19(2): 151-157.

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URL: https://www.biodiversity-science.net/EN/10.3724/SP.J.1003.2011.07010

https://www.biodiversity-science.net/EN/Y2011/V19/I2/151

Figures/Tables 4

References 23

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序号 Rank	种名 Species	幼苗个体数 No. of seedlings		出现样方数 No. of quadrats present		相对频度 Relative frequency		相对多度 Relative density		重要值 Importance value		死亡率 Mortality rate (%)
序号 Rank	种名 Species	初查 First survey	复查Second survey	初查 First survey	复查Second survey	初查 First survey	复查Second survey	初查 First survey	复查Second survey	初查 First survey	复查 Second survey	死亡率 Mortality rate (%)
1	多花山矾 Symplocos ramosissima	861	730	445	398	26.96	26.31	24.65	23.89	51.61	50.20	15.21
2	黄心树 Machilus gamblei	1,195	1,055	196	183	11.87	12.10	34.21	34.52	46.08	46.62	11.72
3	硬壳柯 Lithocarpus hancei	161	136	125	113	7.57	7.47	4.61	4.45	12.18	11.92	15.53
4	云南连蕊茶 Camellia forrestii	163	145	124	118	7.51	7.80	4.67	4.74	12.18	12.54	11.04
5	瑞丽鹅掌柴 Schefflera shweliensis	188	185	112	108	6.78	6.05	5.38	7.14	12.16	13.19	1.60
6	珊瑚冬青 Ilex corallina	148	167	108	122	6.54	5.46	4.24	8.06	10.78	13.52	-12.84
7	多果新木姜子 Neolitsea polycarpa	120	101	91	86	5.51	3.31	3.44	5.68	8.95	8.99	15.83
8	黄丹木姜子 Litsea elongata	117	98	57	55	3.45	3.21	3.35	3.64	6.80	6.85	16.24
9	南洋木荷 Schima noronhae	66	55	43	38	2.60	1.80	1.89	2.51	4.49	4.31	16.67
10	中缅八角 Illicium burmanicum	43	35	32	27	1.94	1.15	1.23	1.78	3.17	2.93	18.60

序号 Rank	种名 Species	幼苗个体数 No. of seedlings		出现样方数 No. of quadrats present		相对频度 Relative frequency		相对多度 Relative density		重要值 Importance value		死亡率 Mortality rate (%)
序号 Rank	种名 Species	初查 First survey	复查Second survey	初查 First survey	复查Second survey	初查 First survey	复查Second survey	初查 First survey	复查Second survey	初查 First survey	复查 Second survey	死亡率 Mortality rate (%)
1	多花山矾 Symplocos ramosissima	861	730	445	398	26.96	26.31	24.65	23.89	51.61	50.20	15.21
2	黄心树 Machilus gamblei	1,195	1,055	196	183	11.87	12.10	34.21	34.52	46.08	46.62	11.72
3	硬壳柯 Lithocarpus hancei	161	136	125	113	7.57	7.47	4.61	4.45	12.18	11.92	15.53
4	云南连蕊茶 Camellia forrestii	163	145	124	118	7.51	7.80	4.67	4.74	12.18	12.54	11.04
5	瑞丽鹅掌柴 Schefflera shweliensis	188	185	112	108	6.78	6.05	5.38	7.14	12.16	13.19	1.60
6	珊瑚冬青 Ilex corallina	148	167	108	122	6.54	5.46	4.24	8.06	10.78	13.52	-12.84
7	多果新木姜子 Neolitsea polycarpa	120	101	91	86	5.51	3.31	3.44	5.68	8.95	8.99	15.83
8	黄丹木姜子 Litsea elongata	117	98	57	55	3.45	3.21	3.35	3.64	6.80	6.85	16.24
9	南洋木荷 Schima noronhae	66	55	43	38	2.60	1.80	1.89	2.51	4.49	4.31	16.67
10	中缅八角 Illicium burmanicum	43	35	32	27	1.94	1.15	1.23	1.78	3.17	2.93	18.60

序号 Rank	种名 Species	相对密度 Relative density	相对频度 Relative frequency	相对优势度 Relative dominance	重要值 Importance value
1	硬壳柯 Lithocarpus hancei	7.86	5.01	27.48	13.45
2	变色锥 Castanopsis wattii	4.46	4.75	16.06	8.42
3	云南连蕊茶 Camellia forrestii	14.11	5.19	1.02	6.77
4	云南越桔 Vaccinium duclouxii	11.17	4.48	3.06	6.24
5	木果柯 Lithocarpus xylocarpus	1.99	3.70	12.10	5.93
6	多花山矾 Symplocos ramosissima	9.88	4.52	1.84	5.41
7	山矾 S. sumuntia	9.17	4.97	1.46	5.20
8	南洋木荷 Schima noronhae	1.48	3.29	7.31	4.03
9	滇润楠 Machilus yunnanensis	3.21	4.97	3.38	3.86
10	珊瑚冬青 Ilex corallina	3.21	3.62	3.62	3.48

序号 Rank	种名 Species	相对密度 Relative density	相对频度 Relative frequency	相对优势度 Relative dominance	重要值 Importance value
1	硬壳柯 Lithocarpus hancei	7.86	5.01	27.48	13.45
2	变色锥 Castanopsis wattii	4.46	4.75	16.06	8.42
3	云南连蕊茶 Camellia forrestii	14.11	5.19	1.02	6.77
4	云南越桔 Vaccinium duclouxii	11.17	4.48	3.06	6.24
5	木果柯 Lithocarpus xylocarpus	1.99	3.70	12.10	5.93
6	多花山矾 Symplocos ramosissima	9.88	4.52	1.84	5.41
7	山矾 S. sumuntia	9.17	4.97	1.46	5.20
8	南洋木荷 Schima noronhae	1.48	3.29	7.31	4.03
9	滇润楠 Machilus yunnanensis	3.21	4.97	3.38	3.86
10	珊瑚冬青 Ilex corallina	3.21	3.62	3.62	3.48

生境 Habitat	原幼苗 Seedlings at initial census		新增幼苗 Recruited seedlings
生境 Habitat	原数量 Numbers	死亡数量 No. of death (%)	数量 Numbers	死亡数量 No. of death (%)	种数 No. of species
林窗中心 Gap center	154	29 (18.83%)^*	71	23 (32.39%)^*	18
林窗边缘 Gap edge	166	29 (17.47%)^*	75	22 (29.33%)^*	16
林冠下 Under canopy	258	46 (17.83%)^*	59	34 (57.63%)^*	14
合计 Total	578	104	205	79	26