Dynamic Changes of Undergrowth Species Diversity and Biomass of Eucalyptus robusta Plantations at Different Ages

doi:10.7525/j.issn.1673-5102.2021.04.004

Abstract

Abstract:

By using the spatial replacement time and the typical sampling as methods， taking Eucalyptus robusta plantation in Weiyuan County， Sichuan Province as materials， we comprehensively analyzed the composition of the understory vegetation species and important value， and the aboveground， underground and whole plant biomass of the shrub and herb layers and species diversity index（Shannon-Wiener diversity index H， Simpson dominance index H′， richness index D and Pielou evenness index J_SW）， and explored the dynamic changes of species diversity and biomass of undergrowth vegetation at five different forest ages（4， 5， 6， 7， 8 years） and the correlation between them respectively. The results showed that： A total of 210 species were found， belonging to 79 families and 151 genera， with more species in the herb layer than in the shrub layer. The herb layer of Miscanthus floridulus， Dicranopteris pedata and shrub layer of Melastoma malabathricum and Rubus hastifolius all occupied the dominant position at different ages respectively. With the forest age increasing， the density canopy increased， the D value， H value and H′ value of shrub layer all increased first and then decreased respectively； The D， H and H′ values of the herb layer showed a trend of change of the bimodal curve after increased， then decreased， then increased and then decreased. The biomass of the herb layer increased first and then decreased and then increased， the biomass of shrub layer increased first and then decreased. There was a significant positive correlation between species diversity and biomass， the D and H indices of herb layer were the direct factors affecting biomass. The species distribution， composition， species diversity and biomass of undergrowth vegetation in Eucalyptus robusta plantation were different in response to changes in forest age， showing different dynamic characteristic rules， the results provided data support for Eucalyptus robusta forest management in southwest China.

Key words: forest age, Eucalyptusrobusta plantation, species diversity, biomass, dynamic change

CLC Number:

S792.39

Min WANG, Run-Hui ZHOU, Fei-Yan YU, Hong-Jun DONG, Cong-Lin CHEN, Jing YU, Jian-Feng HAO. Dynamic Changes of Undergrowth Species Diversity and Biomass of Eucalyptus robusta Plantations at Different Ages[J]. Bulletin of Botanical Research, 2021, 41(4): 496-505.

Figures/Tables 6

Table 1

Fig.1

Table 2

Important values of dominant species of shrub and herb layers in E. robusta plantation of different ages

层次 Layer	年龄 Age(a)	优势种 Dominant species
灌木层 Shrub Layer	4	油桐Vernicia fordii(0.1110)+野牡丹Melastomamalabathricum(0.1050)+地桃花Urena lobata(0.0994)+杜茎山Maesa japonica(0.0861)+毛桐Mallotus barbatus(0.0555)
	5	山茶Camellia japonica(0.2174)+戟叶悬钩子Rubus hastifolius(0.1533)+茶Camellia sinensis(0.1149)+楤木Aralia elata(0.0909)+卫矛Euonymus alatus(0.0688)
	6	野牡丹Melastoma malabathricum(0.1060)+铁仔Myrsine Africana(0.0962)+茶Camellia sinensis(0.0897)+山茶Camellia japonica(0.0772)+菝葜Smilax china(0.0561)
	7	楤木Aralia elat(0.2637)+野牡丹Melastoma malabathricum(0.0886)+戟叶悬钩子Rubus hastifolius(0.0865)+桉树E. robusta(0.0785)+铁仔Myrsine africana(0.0645)
	8	桉树E. robusta(0.2408)+野牡丹Melastoma malabathricum(0.1184)+戟叶悬钩子Rubus hastifolius(0.0751)+毛桐Mallotus barbatus(0.0643)+山茶Camellia japonica(0.0580)
草本层 Herb Layer	4	五节芒Miscanthus floridulus(0.1489)+驴蹄草Caltha palustris(0.0643)+斑茅Saccharum arundinaceum(0.0603)+金丝草Pogonatherum crinitum(0.0498)+糯米团Gonostegia hirta(0.0498)
	5	芒萁Dicranopteris pedata(0.3074)+五节芒Miscanthus floridulus(0.2341)+蕨Pteridium aquilinum(0.0744)+驴蹄草Caltha palustris(0.0661)+斑茅Saccharum arundinaceum(0.0533)
	6	芒萁Dicranopteris pedata(0.2956)+五节芒Miscanthus floridulus(0.2669)+白茅Imperata cylindrical(0.1156)+稗Echinochloa crus-galli(0.0691)+东风草Blumea megacephala(0.0463)
	7	五节芒Miscanthus floridulus(0.1819)+芒萁Dicranopteris pedata(0.1586)+白茅Imperata cylindrical(0.0796)+积雪草Centella asiatica(0.0557)+石荠苎Mosla scabra(0.0551)
	8a	五节芒Miscanthus floridulus(0.2263)+紫苏Perilla frutescens(0.1217)+芒萁Dicranopteris pedata(0.0872)+野茼蒿Crassocephalum crepidioides(0.0643)+蕨Pteridium aquilinum(0.0651)

Table 2

Fig.2

Fig.3

Table 3

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年龄 Age(a)	样地序号 Plot number	面积 Area (m2)	海拔 Altitude (m)	坡度 Slope (?)	坡向 Aspect	密度 Density (株·hm^-2)	郁闭度 Conopy density	平均树高 Average height (m)	平均胸径 Average diameter(cm)
4	1~4	20×30	733~739	23~28	西北NW	1012.0±4.00a	0.208±0.01e	7.43±0.49d	6.93±0.23e
5	5~8	20×30	666~694	9~23	正北North	970.5±10.53b	0.295±0.03d	11.35±0.49c	11.55±0.5d
6	9~12	20×30	677~717	6~10	正南South	928.8±8.14c	0.420±0.02c	16.30±0.48b	13.63±0.3c
7	13~16	20×30	564~580	21~29	正东East	900.00	0.535±0.02b	19.98±0.21a	16.30±0.2b
8	17~20	20×30	706~714	9~17	东南SW	895.8±4.25d	0.705±0.02a	20.83±0.19a	18.98±0.4a

		灌木层Shrub layer			草本层Herb layer
		地上生物量 Aboveground biomass	地下生物量 Underground biomass	地上+地下 Total biomass	地上生物量 Aboveground biomass	地下生物量 Underground biomass	地上+地下 Total biomass
灌木层 Shrub layer	D	0.53^*	0.48^*	0.52^*	0.09	0.04	0.07
	H	0.44^*	0.33	0.41	0.15	0.01	0.08
	H′	0.24	0.11	0.21	0.22	0.09	0.16
	J_sw	-0.77	-0.18	-0.10	0.07	-0.06	0
	D	0.65^**	0.63^**	0.65^**	0.42	0.46^*	0.47^*
草本层 Herb layer	H	0.42	0.42	0.42	0.35	0.45^*	0.43
	H′	0.21	0.24	0.22	0.33	0.41	0.40
	J_sw	0.05	0.12	0.07	0.09	0.25	0.19

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