Interannual effects of growth, module biomass accumulation and allocation of Polygonatum cyrtonema under Phyllostachys edulis forest

doi:10.12302/j.issn.1000-2006.202201028

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (5): 121-128.doi: 10.12302/j.issn.1000-2006.202201028

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Interannual effects of growth, module biomass accumulation and allocation of Polygonatum cyrtonema under Phyllostachys edulis forest

LI Jianxin¹(), XU Sen², YANG Liting², CHEN Shuanglin², GUO Ziwu²^,^*()

1. Jiangshan Forestry Technology Promotion Station, Jiangshan 324100, China
2. Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou 311400, China

Received:2022-01-17 Revised:2022-04-16 Online:2023-09-30 Published:2023-10-10

Abstract

Abstract:

【Objective】Polygonatum cyrtonema is the main plant used in the compound management of bamboo forests and in Chinese medicine. This study examined the effects of planting years on the growth and biomass allocation characteristics of Polygonatum cyrtonema in the understory of Phyllostachys edulis forest to provide a theoretical reference for the efficient management of Phyllostachys edulis and Polygonatum cyrtonema. 【Method】Polygonatum cyrtonema plants grown in Phyllostachys edulis for one, two and three years were selected to investigate the growth characteristics and biomass of stems, leaves, roots, fruits and tubers during different planting years. Allometric growth of the module biomass was also analyzed. 【Result】With the increasing planting time, basal diameter, height, crown length, fruit number and population density increased significantly, whereas the number of leaves first decreased and then increased. The module biomass, aboveground biomass/underground biomass, the allocation proportion of stems, leaves, fruits and allometric growth index of stem, leaf and fruit-total biomass increased, whereas the allocation proportion of tuber and root biomass and the allometric growth index of tuber-total biomass decreased. Additionally, the allometric growth index of root-total biomass initially increased and then decreased. 【Conclusion】Planting year significantly affected the growth, population characteristics, biomass accumulation and allocation, and allometric growth of Polygonatum cyrtonema. Polygonatum cyrtonema could regulate its resource allocation to adapt to the resource limitations of different population densities. Tuber biomass increased the fastest for the plants grown for two years, but decreased obviously for the plants grown for three years, which could be considered the optimal harvesting time.

Key words: compound management of bamboo forests and Chinese medicine, Polygonatum cyrtonema, cultivation years, allometric growth, biomass accumulation and allocation

CLC Number:

S759

LI Jianxin, XU Sen, YANG Liting, CHEN Shuanglin, GUO Ziwu. Interannual effects of growth, module biomass accumulation and allocation of Polygonatum cyrtonema under Phyllostachys edulis forest[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2023, 47(5): 121-128.

Figures/Tables 5

Table 1

Table 2

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Table 3

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种植年限/a planting year	基径/mm basal diameter	高度/cm height	冠长/cm crown length	果粒数/粒 fruit number	叶片数量/片 leaf number	植株密度/(株·m^-2) density
1	6.68±0.55 b	52.31±2.34 c	25.86±2.85 c	2.00±1.73 c	15.62±2.00 a	8.00±1.00 c
2	6.11±0.97 b	68.59±5.30 b	31.84±2.64 b	13.89±5.51 b	11.93±1.72 b	17.33±4.73 b
3	9.31±0.31 a	103.84±2.32 a	55.67±1.35 a	22.30±6.84 a	18.52±0.87 a	32.67±1.15 a

种植年限/a planting year	秆生物量/g stem biomass	叶生物量/g leaf biomass	根生物量/g root biomass	果生物量/g fruit biomass	块茎生物量/g tuber biomass	地上/地下生物量比 ratio of above biomass to below biomass	总生物量/g total biomass
1	1.48±0.36 c	1.33±0.22 c	1.51±0.23 b	0.43±0.11 c	20.12±2.63 c	0.14±0.01 c	24.87±3.22 c
2	3.01±0.56 b	3.44±0.38 b	1.82±0.26 b	2.57±0.36 b	27.46±2.33 b	0.19±0.02 b	38.29±2.69 b
3	9.49±1.22 a	9.08±1.36 a	3.48±0.39 a	12.74±1.29 a	61.79±4.16 a	0.48±0.04 a	96.58±6.33 a

参数 parameter	种植年限/a planting year	R²	斜率 SMA slope	b的置信区间 confidence interval of slope b		P
参数 parameter	种植年限/a planting year	R²	斜率 SMA slope	下限LowCI	上限UppCI	P
秆-总生物量 stem-total biomass	1	0.402 5	0.601 1	0.840 7	0.429 8	0.003 9
	2	0.479 2	1.109 4[1.00]	1.351 7	0.910 5	0.298 8
	3	0.571 9	1.506 9	1.719 8	1.320 3	0.000 1
叶-总生物量 leaf-total biomass	1	0.403 0	0.452 0	0.632 0	0.323 2	0.000 1
	2	0.440 2	1.209 9[1.00]	1.484 8	0.985 9	0.067 7
	3	0.559 9	1.693 2	1.936 0	1.480 8	0.000 1
根-总生物量 root-total biomass	1	0.247 9	0.414 2	0.602 4	0.284 8	0.000 1
	2	0.589 5	1.003 8[1.00]	1.215 3	0.829 1	0.968 6
	3	0.509 5	0.733 4	0.885 2	0.607 6	0.001 5
果-总生物量 fruit-total biomass	1	0.071 8	0.525 8(0.572 5)	1.235 8	0.223 7	0.130 8
	2	0.302 1	0.582 7(0.572 5)	0.805 8	0.421 4	0.001 5
	3	0.103 2	0.772 8	0.943 2	0.633 2	0.011 5
块茎-总生物量 tuber-total biomass	1	0.961 3	1.013 0([1.00])	1.105 0	0.928 7	0.760 2
	2	0.970 2	1.010 6([1.00])	1.064 2	0.959 6	0.684 9
	3	0.948 4	0.887 4	0.943 1	0.835 1	0.000 2

Interannual effects of growth, module biomass accumulation and allocation of Polygonatum cyrtonema under Phyllostachys edulis forest

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