Composition and monthly dynamics of tree seedlings in a coniferous and broad-leaved mixed forest in Jiaohe, Jilin Province, China

doi:10.17521/cjpe.2015.0068

Abstract

Abstract: Aims The objective of this paper is to quantify the composition and dynamics of tree seedlings in the coniferous and broad-leaved mixed forest in north-eastern China. Methods We installed 224 sampling quadrats (1 m × 1 m) at the Jiaohe Experimental Forest in Jilin Province of northeastern China. All seedlings in the quadrats were tagged and measured by species. Based on three consecutive sampling from mid-June to mid-August in 2013, we studied the species composition and dynamics of tree seedlings by month. Multiple linear regression was used to quantify the relationship between seedlings and the neighboring trees with the diameter at breast height (DBH) of 1 cm. Important findings A total of 16 species were recorded. There was no significant difference in species composition between June and July, but a great variation in the seedling composition in August. From June to August 2013, 1214 out of 1722 individual seedlings survived. There were significant differences in the total number and the number of individual species in the quadrats. The death and recruitment pattern of newborn seedlings showed significant differences among species and by month. The mortality rate in June was 48.9%, which was significantly higher than that in August (28.3%). The mortality rate of perennial seedlings during the observation period was 7.34%, which was significantly less than the mortality rate of new seedlings (40.56%). We found that the recruitment rate of the dominant species in July was higher than that in August. The recruitment occurred mostly in June. Multiple linear regression was used to analyze the relationship between the seedling abundance of eight species and the number of conspecifics, as well as the sum of conspecific basal areas within 20 m distance from a station. Factors influencing seedling abundance differed among species. For Acer mono, Tilia amurensis and Abies holophylla, significant partial regression coefficients appeared positive (p = 0.006, 0.013, 0.037, respectively), indicating that the seedling abundance increased with basal area. Other species did not show this correlation.

Key words: coniferous and broad-leaved mixed forest, monthly dynamics, seedling regeneration, species composition

YAO Jie,YAN Yan,ZHANG Chun-Yu,PI Tian-Hui,ZHAO Xiu-Hai. Composition and monthly dynamics of tree seedlings in a coniferous and broad-leaved mixed forest in Jiaohe, Jilin Province, China[J]. Chin J Plan Ecolo, 2015, 39(7): 717-725.

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https://www.plant-ecology.com/EN/Y2015/V39/I7/717

Figures/Tables 7

References 32

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种名 Species	幼苗数量 No. of seedlings	幼苗密度 Seedling density (mean ± SE, n = 224)	幼苗密度的变异系数 CV of seedling density (%)	相对多度 Relative abundance	相对频度 Relative frequency	重要值 Important value
色木槭 Acer mono	509	2.272 ± 0.176	116.11	29.56	23.59	53.15
水曲柳 Fraxinus mandshurica	381	1.701 ± 0.177	156.05	22.13	18.84	40.97
东北槭 Acer mandshuricum	262	1.170 ± 0.103	131.25	15.21	18.40	33.61
紫椴 Tilia amurensis	299	1.335 ± 0.195	218.78	17.36	12.46	29.83
糠椴 Tilia mandshurica	65	0.290 ± 0.048	248.70	3.77	5.79	9.56
千金榆 Carpinus cordata	49	0.219 ± 0.035	241.59	2.85	5.64	8.48
青楷槭 Acer tegmentosum	44	0.196 ± 0.036	271.36	2.56	5.19	7.75
杉松 Abies holophylla	46	0.205 ± 0.064	464.10	2.67	3.12	5.79
春榆 Ulmus davidiana var. japonica	25	0.112 ± 0.030	407.87	1.45	2.37	3.83
红松 Pinus koraiensis	17	0.076 ± 0.024	480.95	0.99	1.63	2.62
髭脉槭 Acer barbinerve	12	0.054 ± 0.019	520.78	0.70	1.34	2.03
裂叶榆 Ulmus laciniata	6	0.027 ± 0.015	860.22	0.35	0.59	0.94
拧筋槭 Acer triflorum	4	0.018 ± 0.009	743.28	0.23	0.59	0.83
胡桃楸 Juglans mandshurica	1	0.004 ± 0.004	1 496.67	0.06	0.15	0.21
黄檗 Phellodendron amurense	1	0.004 ± 0.004	1 496.67	0.06	0.15	0.21
蒙古栎 Quercus mongolica	1	0.004 ± 0.004	1 496.67	0.06	0.15	0.21
合计 Total	1 722	_	_	100.00	100.00	200.00

种名 Species	幼苗数量 No. of seedlings	幼苗密度 Seedling density (mean ± SE, n = 224)	幼苗密度的变异系数 CV of seedling density (%)	相对多度 Relative abundance	相对频度 Relative frequency	重要值 Important value
色木槭 Acer mono	509	2.272 ± 0.176	116.11	29.56	23.59	53.15
水曲柳 Fraxinus mandshurica	381	1.701 ± 0.177	156.05	22.13	18.84	40.97
东北槭 Acer mandshuricum	262	1.170 ± 0.103	131.25	15.21	18.40	33.61
紫椴 Tilia amurensis	299	1.335 ± 0.195	218.78	17.36	12.46	29.83
糠椴 Tilia mandshurica	65	0.290 ± 0.048	248.70	3.77	5.79	9.56
千金榆 Carpinus cordata	49	0.219 ± 0.035	241.59	2.85	5.64	8.48
青楷槭 Acer tegmentosum	44	0.196 ± 0.036	271.36	2.56	5.19	7.75
杉松 Abies holophylla	46	0.205 ± 0.064	464.10	2.67	3.12	5.79
春榆 Ulmus davidiana var. japonica	25	0.112 ± 0.030	407.87	1.45	2.37	3.83
红松 Pinus koraiensis	17	0.076 ± 0.024	480.95	0.99	1.63	2.62
髭脉槭 Acer barbinerve	12	0.054 ± 0.019	520.78	0.70	1.34	2.03
裂叶榆 Ulmus laciniata	6	0.027 ± 0.015	860.22	0.35	0.59	0.94
拧筋槭 Acer triflorum	4	0.018 ± 0.009	743.28	0.23	0.59	0.83
胡桃楸 Juglans mandshurica	1	0.004 ± 0.004	1 496.67	0.06	0.15	0.21
黄檗 Phellodendron amurense	1	0.004 ± 0.004	1 496.67	0.06	0.15	0.21
蒙古栎 Quercus mongolica	1	0.004 ± 0.004	1 496.67	0.06	0.15	0.21
合计 Total	1 722	_	_	100.00	100.00	200.00

	6月 June		7月 July					8月 August
	幼苗数量 No. of seedlings		新增数 No. of recruitment	死亡数 No. of death	死亡率 Mortality rate (%)	增补率 Recruitment rate (%)		新增数 No. of recruitment	死亡数 No. of death	死亡率 Mortality rate (%)	增补率 Recruitment rate (%)
	幼苗数量 No. of seedlings	当年生幼苗 Newly-born seedlings	新增数 No. of recruitment	死亡数 No. of death	死亡率 Mortality rate (%)	增补率 Recruitment rate (%)	1 231	新增数 No. of recruitment	死亡数 No. of death	死亡率 Mortality rate (%)	增补率 Recruitment rate (%)	89	476	48.9	11.1	19	208	28.3	2.9
多年生幼苗 Perennial seedlings	491		92	26	5.4	18.1		43	41	7.6	8.0
合计 Total	1 722		181	502	34.5	13.8		62	249	19.6	5.2

	6月 June		7月 July					8月 August
	幼苗数量 No. of seedlings		新增数 No. of recruitment	死亡数 No. of death	死亡率 Mortality rate (%)	增补率 Recruitment rate (%)		新增数 No. of recruitment	死亡数 No. of death	死亡率 Mortality rate (%)	增补率 Recruitment rate (%)
	幼苗数量 No. of seedlings	当年生幼苗 Newly-born seedlings	新增数 No. of recruitment	死亡数 No. of death	死亡率 Mortality rate (%)	增补率 Recruitment rate (%)	1 231	新增数 No. of recruitment	死亡数 No. of death	死亡率 Mortality rate (%)	增补率 Recruitment rate (%)	89	476	48.9	11.1	19	208	28.3	2.9
多年生幼苗 Perennial seedlings	491		92	26	5.4	18.1		43	41	7.6	8.0
合计 Total	1 722		181	502	34.5	13.8		62	249	19.6	5.2

物种名 Species	新生幼苗数量 No. of newly-born seedlings					新生幼苗出现样方数 No. of quadrats presented with newly-born seedlings				新生幼苗死亡数 No. of death with newly-born seedlings		新生幼苗死亡率 Mortality rate of newly-born seedlings (%)		新生幼苗更新率 Recruitment rate of newly-born seedlings (%)
	6-8月 June- August	6月 June	7月 July	8月 August		6-8月 June- August	6月 June	7月 July	8月 August	7月 July	8月 August	7月 July	8月 August	7月 July	8月 August
	6-8月 June- August	6月 June	7月 July	8月 August	色木槭 Acer mono	6-8月 June- August	6月 June	7月 July	8月 August	7月 July	8月 August	7月 July	8月 August	7月 July	8月 August	493	453	30	10	154	148	28	10	131	49	34.1	15.0	8.9	3.2
紫椴 Tilia amurensis	301	291	10	_		87	84	6	_	201	59	117.4	89.2	10.5	0
东北槭 Acer mandshuricum	271	238	28	5		118	113	24	5	55	51	26.3	27.7	14.2	3.1
水曲柳 Fraxinus mandshurica	80	74	6	_		55	53	6	_	6	10	8.5	14.5	8.5	0
糠椴 Tilia mandshurica	65	63	1	1		39	38	1	1	38	15	92.4	86.0	3.9	8.7
千金榆 Carpinus cordata	49	45	4	_		36	35	3	_	20	12	58.8	53.4	14.8	0
青楷槭 Acer tegmentosum	42	41	1	_		33	32	1	_	14	7	41.8	28.8	3.6	0
红松 Pinus koraiensis	16	12	3	1		9	8	1	1	7	0	87.5	0	47.0	11.8
春榆 Ulmus davidiana var. japonica	11	8	2	1		9	8	2	1	3	2	47.0	33.6	33.6	18.2
髭脉槭 Acer barbinerve	6	4	1	1		6	4	1	1	1	0	28.8	0	28.8	22.3
胡桃楸 Juglans mandshurica	2	_	2	_		2	_	2	_	0	1	_	69.3	_	0
拧筋槭 Acer triflorum	2	2	_	_		2	2	_	_	0	2	0	_	0	_
杉松 Abies holophylla	1	_	1	_		1	_	1	_	0	0	_	0	_	0
合计 Total	1 339	1 231	89	19						476	208	48.9	28.3	11.1	2.9