Effect of soil moisture and plant density on vegetative propagation traits and biomass of Elymus nutans

doi:10.11686/cyxb2020424

Abstract

Abstract:

Elymus nutans， a good quality forage， produces daughter plants through vegetative asexual propagation in the alpine region. However， it’s unclear whether interaction between plant density and soil moisture has an influence on the subterranean vegetative propagation of E. nutans. In this study， a pot experiment was carried out to analyze the pattern of change in subterranean vegetative propagation （ramet numbers， rhizome length and underground bud number per plant） and biomass of E. nutans under different combinations of soil moisture and plant density. There were three soil moisture treatments： 30% of field capacity （W₁）； 50% of field capacity （W₂） and 80% of field capacity （W₃）， and three plant densities （4， 8， and 12 plants·pot^-1； R₁， R₂and R₃， respectively）. This study showed that with increase in soil moisture， ramets per plant at first increased and then decreased， whereas rhizome length， numbers of underground buds per plant， aboveground and belowground biomass and total biomass all increased. With increase in plant density， ramets per plant， rhizome length， numbers of underground buds per plant， aboveground and belowground biomass and total biomass all decreased. Significant interaction effects between soil moisture and plant density were observed for ramets per plant， rhizome length， numbers of underground buds per plant， aboveground and belowground biomass and total biomass. Based on the results of this study， the optimal treatment for development of rhizome length， numbers of underground buds per plant， and aboveground and total biomass was W₃R₁， while for ramets per plant and belowground biomass the optimal treatment was W₃R₁. This indicates that in management of E. nutans cultivated grassland， soil moisture should be considered when determining the ideal plant density.

Key words: ramets per plant, rhizome length, underground buds per plant, biomass

Ling-ling WANG, Kunduzay·Turgun, Guang-fei MENG, Zheng-gang GUO. Effect of soil moisture and plant density on vegetative propagation traits and biomass of Elymus nutans[J]. Acta Prataculturae Sinica, 2021, 30(11): 52-61.

Figures/Tables 9

References 40

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项目Item	处理Treatments	克隆小株数 Ramets per plant	传播距离 Spreading length （cm）
土壤水分 Soil moisture	W₁	4.44±0.53c	2.24±0.25b
	W₂	7.67±2.81a	2.73±0.90b
	W₃	6.46±1.47b	3.25±1.29a
	显著性Significant	**	**
植株密度 Plant density	R₁	7.88±2.66a	3.35±1.28a
	R₂	6.25±1.52b	2.86±0.54a
	R₃	4.44±0.55c	2.01±0.38b
	显著性Significant	**	**
土壤水分×植株密度 Soil moisture×plant density	W₁R₁	4.63±0.48d	2.19±0.19c
	W₁R₂	4.50±0.41d	2.32±0.06bc
	W₁R₃	4.21±0.71d	2.21±0.43c
	W₂R₁	10.75± 0.65a	3.43±0.61a
	W₂R₂	8.00±0.35b	3.11±0.34b
	W₂R₃	4.25±0.29d	1.64±0.22c
	W₃R₁	8.25±0.29b	4.45±1.49a
	W₃R₂	6.25±0.20c	3.14±0.62b
	W₃R₃	4.88±0.37d	2.17±0.18c
	显著性Significant	**	**

项目Item	处理Treatments	克隆小株数 Ramets per plant	传播距离 Spreading length （cm）
土壤水分 Soil moisture	W₁	4.44±0.53c	2.24±0.25b
	W₂	7.67±2.81a	2.73±0.90b
	W₃	6.46±1.47b	3.25±1.29a
	显著性Significant	**	**
植株密度 Plant density	R₁	7.88±2.66a	3.35±1.28a
	R₂	6.25±1.52b	2.86±0.54a
	R₃	4.44±0.55c	2.01±0.38b
	显著性Significant	**	**
土壤水分×植株密度 Soil moisture×plant density	W₁R₁	4.63±0.48d	2.19±0.19c
	W₁R₂	4.50±0.41d	2.32±0.06bc
	W₁R₃	4.21±0.71d	2.21±0.43c
	W₂R₁	10.75± 0.65a	3.43±0.61a
	W₂R₂	8.00±0.35b	3.11±0.34b
	W₂R₃	4.25±0.29d	1.64±0.22c
	W₃R₁	8.25±0.29b	4.45±1.49a
	W₃R₂	6.25±0.20c	3.14±0.62b
	W₃R₃	4.88±0.37d	2.17±0.18c
	显著性Significant	**	**

处理 Treatments	植株密度 Plant density			主效应土壤水分Main effect of soil moisture
处理 Treatments	R₁	R₂	R₃	主效应土壤水分Main effect of soil moisture
土壤水分Soil moisture
W₁	2.25±0.29bc	2.44±0.63bc	2.79±0.21b	2.49±0.44b
W₂	4.00±1.22a	2.00±0.84c	1.71±0.42c	2.57±1.33b
W₃	4.75±1.19a	2.44±0.88bc	4.21±2.07a	3.80±1.68a
主效应植株密度Main effect of plant density	3.67±1.42a	2.29±0.74b	2.90±1.54ab
土壤水分Soil moisture			**
植株密度Plant density			*
土壤水分×植株密度Soil moisture×plant density			*

处理 Treatments	植株密度 Plant density			主效应土壤水分Main effect of soil moisture
处理 Treatments	R₁	R₂	R₃	主效应土壤水分Main effect of soil moisture
土壤水分Soil moisture
W₁	2.25±0.29bc	2.44±0.63bc	2.79±0.21b	2.49±0.44b
W₂	4.00±1.22a	2.00±0.84c	1.71±0.42c	2.57±1.33b
W₃	4.75±1.19a	2.44±0.88bc	4.21±2.07a	3.80±1.68a
主效应植株密度Main effect of plant density	3.67±1.42a	2.29±0.74b	2.90±1.54ab
土壤水分Soil moisture			**
植株密度Plant density			*
土壤水分×植株密度Soil moisture×plant density			*

项目 Item	处理 Treatments	地上生物量 Aboveground biomass	地下生物量 Underground biomass	总生物量 Total biomass
土壤水分 Soil moisture	W₁	0.71±0.19b	0.16±0.09b	0.85±0.23b
	W₂	0.83±0.26b	0.47±0.36a	1.23±0.40a
	W₃	1.07±0.69a	0.43±0.27a	1.46±0.93a
	显著性Significant	**	**	**
植株密度 Plant density	R₁	1.25±0.56a	0.53±0.43a	1.68±0.80a
	R₂	0.82±0.21b	0.28±0.18b	1.09±0.40b
	R₃	0.54±0.05c	0.25±0.08b	0.77±0.10c
	显著性Significant	**	**	**
土壤水分×植株密度 Soil moisture×plant density	W₁R₁	0.88±0.13b	0.10±0.06c	0.97±0.20c
	W₁R₂	0.72±0.18b	0.19±0.13c	0.88±0.31c
	W₁R₃	0.52±0.04c	0.18±0.05c	0.69±0.08c
	W₂R₁	0.91±0.19b	0.75±0.49a	1.43±0.03b
	W₂R₂	1.02±0.24b	0.40±0.22b	1.46±0.48b
	W₂R₃	0.56±0.05c	0.25±0.06c	0.80±0.10c
	W₃R₁	1.96±0.28a	0.73±0.27a	2.64±0.55a
	W₃R₂	0.72±0.06b	0.25±0.14c	0.93±0.17c
	W₃R₃	0.53±0.08c	0.32±0.08b	0.82±0.09c
	显著性Significant	**	*	**