Effects of enclosure and long-term mowing on vegetative reproduction characteristics of Leymus chinensis and Arundinella hirta populations in the Songnen Grassland， China

doi:10.11686/cyxb2022203

Abstract

Abstract:

Vegetative reproduction is one of the main ways in which clonal grasses regenerate their populations. It is useful to determine the potential population that can be regenerated to predict the spatial structure and dynamics of the population. Enclosure and long-term mowing can directly or indirectly affect plant growth and reproductive strategies. In this study， we compared and analyzed the composition， size， and vegetative propagation capacity of potential populations generated by tillers and rhizomes of the common dominant species Leymus chinensis and the accompanying species Arundinella hirta under enclosure and long-term mowing treatments in the Songnen Grassland. It was found that the potential populations of the two grasses under enclosure and long-term mowing were composed of buds and juvenile tillers derived from tillers and rhizomes. The potential populations of L. chinensis and A. hirta were composed of three and two age classes， respectively. The first age class accounted for the highest proportion of the potential population. Compared with enclosure， long-term mowing significantly promoted the output of buds from tillers and rhizomes of both grasses， and this promotion effect was stronger for L. chinensis than for A. hirta. The number of juvenile tillers produced by tillers and rhizomes of L. chinensis was significantly higher than in A. hirta under both enclosure and long-term mowing. Long-term mowing significantly promoted the potential population increase of L. chinensis， but was not conducive to the formation of an A. hirta potential population. Long-term mowing promoted the vegetative propagation capacity， but not to a significant level. The vegetative reproduction strategy of L. chinensis under enclosure was to produce a large number of buds and some juvenile tillers to enhance the potential population. Its vegetative reproductive strategy under long-term mowing was to produce a large number of juvenile tillers to grow into tillers after successfully overwintering. The vegetative reproduction strategy of A. hirta under enclosure was to produce buds only， while that under long-term mowing was to produce a similar proportion of buds and juvenile tillers. Overall， L. chinensis and A. hirta populations had the same adaptive characteristics， in that young age-class tillers and rhizomes had a high vegetative propagation capacity under enclosure and long-term mowing， and the formation of juvenile tillers was promoted under long-term mowing. At the same time， differences in the vegetative propagation strategies of L. chinensis and A. hirta appear to explain why L. chinensis is the dominant species and A. hirta is the accompanying species in this study area.

Key words: utilization types, potential populations, Leymus chinensis, Arundinella hirta, vegetative propagation capacity

Ji FENG, Zhi-kuo LIU, Hai-yan LI, Yun-fei YANG, Jian GUO. Effects of enclosure and long-term mowing on vegetative reproduction characteristics of Leymus chinensis and Arundinella hirta populations in the Songnen Grassland， China[J]. Acta Prataculturae Sinica, 2023, 32(5): 50-60.

Figures/Tables 9

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因素Factor	U	S	A	U×S	U×A	S×A	U×S×A
芽数Bud number	6.89*	14.44*	61.90*	0.89	3.89*	24.00*	0.77
苗数Juvenile tiller number	94.54*	74.16*	60.61*	37.81*	44.68*	11.22*	6.87*

因素Factor	U	S	A	U×S	U×A	S×A	U×S×A
芽数Bud number	6.89*	14.44*	61.90*	0.89	3.89*	24.00*	0.77
苗数Juvenile tiller number	94.54*	74.16*	60.61*	37.81*	44.68*	11.22*	6.87*

数量 Number （ind·m^-2）	分株龄级 Tiller age class （a）	围栏封育Enclosure		长期刈割Long-term mowing
数量 Number （ind·m^-2）	分株龄级 Tiller age class （a）	羊草L. chinensis	野古草A. hirta	羊草L. chinensis	野古草A. hirta
分蘖节芽Tiller buds	1	218.6±31.9a，#，##	578.6±89.0a	64.0±13.7a	416.0±105.0a，##
	2	149.3±16.3b，#，##	40.0±10.7b	45.3±19.5ab	56.0±29.7b
	3	32.0±5.8c，##	0c	16.0±10.1b	0b
分蘖节苗Juvenile tillers	1	58.6±20.9a，#，##	0	517.3±51.3a	208.0±52.7a，#，##
	2	40.0±11.5a，#，##	0	264.0±38.9b	34.6±25.6ab，##
	3	16.0±5.8a，#，##	0	98.6±19.5c	0b，##

数量 Number （ind·m^-2）	分株龄级 Tiller age class （a）	围栏封育Enclosure		长期刈割Long-term mowing
数量 Number （ind·m^-2）	分株龄级 Tiller age class （a）	羊草L. chinensis	野古草A. hirta	羊草L. chinensis	野古草A. hirta
分蘖节芽Tiller buds	1	218.6±31.9a，#，##	578.6±89.0a	64.0±13.7a	416.0±105.0a，##
	2	149.3±16.3b，#，##	40.0±10.7b	45.3±19.5ab	56.0±29.7b
	3	32.0±5.8c，##	0c	16.0±10.1b	0b
分蘖节苗Juvenile tillers	1	58.6±20.9a，#，##	0	517.3±51.3a	208.0±52.7a，#，##
	2	40.0±11.5a，#，##	0	264.0±38.9b	34.6±25.6ab，##
	3	16.0±5.8a，#，##	0	98.6±19.5c	0b，##

因素Factor	U	S	A	U×S	U×A	S×A	U×S×A
芽数Bud number	22.93*	7.76*	91.08*	64.76*	45.80*	90.65*	28.97*
苗数Juvenile tiller number	50.26*	11.89*	49.88*	6.96*	39.80*	4.19*	2.55