Effects of bamboo charcoal on the growth and nutrient status of Zelkova schneideriana container seedlings

doi:10.12302/j.issn.1000-2006.202102009

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (2): 111-118.doi: 10.12302/j.issn.1000-2006.202102009

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Effects of bamboo charcoal on the growth and nutrient status of Zelkova schneideriana container seedlings

LIU Zemao¹(), YAN Xin², WU Wen³, ZHANG Yuhui³, YU Fangyuan¹^,^*()

1. Co-Innovation Center for the Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China
2. Gaoyou Forestry Technical Instructor Station, Gaoyou 225600, China
3. Shanghai Forestry Station, Shanghai 200040, China

Received:2021-02-03 Accepted:2021-05-09 Online:2022-03-30 Published:2022-04-08
Contact: YU Fangyuan E-mail:727046890@qq.com;fyyu@njfu.edu.cn

Abstract

Abstract:

【Objective】To study the effects of bamboo charcoal on the growth and nutrient status of Zelkova schneideriana container seedlings, and to provide a theoretical basis for determining the most suitable amount of bamboo charcoal for the growth of Z. schneideriana container seedlings.【Method】Using Z. schneideriana container seedlings as the research object, a single-factor randomized block test was conducted and four bamboo charcoal concentration levels (0%, 1%, 3%, and 5%) were used in this experiment. After the test, the seedling growth and nutritional status were measured. Growth indicators included the seedling height, ground diameter, aboveground biomass, underground biomass, total root length, root surface area, total root volume, number of primary lateral roots, and root length of different diameters; nutritional indicators included soluble sugar, starch, soluble protein, nitrogen, and carbon content in stems and roots.【Result】Compared to the control, the height, ground diameter, aboveground biomass, underground biomass, and fine root biomass of Z. schneideriana container seedlings under the other three treatments increased significantly. At the same time, the addition of bamboo charcoal promoted the growth of the aboveground parts of Z. schneideriana container seedlings more effectively than the underground part, which was reflected in the decrease in the root-to-shoot ratio. Under the other three treatments, the number of primary lateral roots, total root length, root surface area, root volume, and fine root length (diameter ≤1 mm) increased significantly compared to the control. The addition of bamboo charcoal significantly reduced the content of soluble sugar and starch in root of Z. schneideriana container seedlings, but had no siginificant effect on soluble protein in root. The addition of bamboo charcoal also promoted the absorption of nitrogen in the medium by the roots of Z. schneideriana container seedlings and accelerated the metabolism of nitrogen in the stems, but had no siginificant effect on the carbon content in the root and seem. The growth promotion and nutrient status improvement of Z. schneideriana container seedlings were enhanced by the increase in bamboo charcoal content. Overall, the addition of 5% bamboo charcoal was the most conducive to the growth of Z. schneideriana container seedlings. Compared to the control, its seedling height increased by 37.84%, ground diameter increased by 17.67%, aboveground biomass increased by 69.56%, underground biomass increased by 63.48%, fine root biomass increased by 49.17%, and fine root length had an increase of 62.38%.【Conclusion】The addition of bamboo charcoal was beneficial to the growth, root establishment, root morphology optimization, and nitrogen absorption and utilization in Z. schneideriana container seedlings. When cultivating Z. schneideriana container seedlings, adding 5% bamboo charcoal to the medium could improve the seedling cultivation.

Key words: bamboo charcoal, Zelkova schneideriana, container seeding, seedling quality, root morphology, nutrient status

CLC Number:

S725

LIU Zemao, YAN Xin, WU Wen, ZHANG Yuhui, YU Fangyuan. Effects of bamboo charcoal on the growth and nutrient status of Zelkova schneideriana container seedlings[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2022, 46(2): 111-118.

Figures/Tables 6

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处理 treatment	苗高/cm seedling height	地径/mm ground diameter	高径比 height-to- diameter ratio
CK	61.04±3.71 b	6.96±0.37 b	87.82±3.24 b
T₁	81.04±2.48 a	7.85±0.27 ab	103.24±2.91 a
T₂	74.55±2.93 ab	7.18±0.26 ab	101.13±2.94 a
T₃	84.14±2.31 a	8.19±0.24 a	102.81±2.88 a

处理 treatment	地上部分/g ground zone	地下部分/g underground zone	细根/g fine root	根茎比 root-to-shoot ratio
CK	6.34±0.16 c	4.08±0.57 b	0.48±0.12 c	0.94±0.08 a
T₁	10.22±0.64 ab	5.85±0.61 ab	0.68±0.18 ab	0.56±0.05 b
T₂	9.44±0.18 b	5.43±0.49 ab	0.62±0.16 ab	0.57±0.06 b
T₃	10.75±0.24 a	6.67±0.62 a	0.72±0.09 a	0.62±0.06 b

处理 treatment	一级侧根数 number of primary side roots	根系总长/cm total root system length	根系表面积/ cm² root surface area	根系体积/ cm³ root volume
CK	3.18±0.17 c	245.83±28.64 b	158.84±19.61 b	6.95±0.69 c
T₁	3.83±0.17 bc	287.53±28.81 ab	219.32±15.59 a	11.90±1.06 bc
T₂	4.50±0.22 ab	336.82±28.52 ab	255.41±10.85 a	23.08±3.10 ab
T₃	5.00±0.44 a	367.11±35.62 a	268.78±20.41 a	26.39±7.01 a

根系直径/ mm root diameter	根系长度/cm root system length
根系直径/ mm root diameter	CK	T₁	T₂	T₃
0<D≤0.5	162.43±11.37 d	205.80±19.53 c	236.40±15.28 ab	258.94±13.5 a
0.5<D≤1.0	32.87±6.43 b	45.39±3.62 ab	54.36±4.81 a	58.18±5.35 a
1.0<D≤1.5	22.61±2.73 a	10.91±1.38 b	9.61±2.15 b	15.10±3.26 ab
1.5<D≤2.0	11.28±2.77 a	6.08±0.74 b	7.39±1.21 b	7.76±2.19 b
2.0<D≤2.5	7.24±1.07 ab	5.63±0.64 c	7.46±1.22 ab	8.67±1.53 a
2.5<D≤3.0	3.52±0.31 b	2.35±0.18 b	5.29±0.47 a	6.05±0.58 a
3.0<D≤3.5	3.35±0.18 ab	3.17±0.13 ab	6.73±0.29 a	4.49±0.21 ab
3.5<D≤4.0	1.77±0.08 c	4.62±0.29 b	6.79±0.41 a	2.97±0.23 bc
4.0<D≤4.5	1.32±0.15 c	1.18±0.18 c	3.87±0.27 ab	4.13±0.18 a
D>4.5	7.7±0.88 c	26.92±1.85 a	16.88±1.72 ab	17.28±2.63 ab

处理 treatment	可溶性糖含量 soluble sugar content	淀粉含量 starch content	可溶性蛋白含量 soluble protein content
CK	21.68±0.93 a	21.71±1.38 a	1.92±0.07 a
T₁	13.50±0.45 b	10.27±0.65 b	1.36±0.04 a
T₂	7.91±0.57 c	12.99±2.10 b	1.23±0.04 a
T₃	9.29±0.26 c	18.22±0.47 a	1.39±0.05 a

Effects of bamboo charcoal on the growth and nutrient status of Zelkova schneideriana container seedlings

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部位 part	月份 month	氮含量 nitrogen content				碳含量 carbon content
部位 part	月份 month	CK	T₁	T₂	T₃	CK	T₁	T₂	T₃
茎 stem	7	52.87±2.87 b	60.55±2.04 a	64.65±2.82 a	57.60±2.61 a	706.95±15.86 a	685.69±2.23 a	711.42±11.82 a	667.31±9.74 b
	8	54.69±2.49 a	47.88±2.32 ab	49.65±1.55 ab	42.79±3.62 c	705.63±16.66 a	642.78±13.26 a	653.59±11.78 a	582.46±20.67 a
	9	48.53±1.64 ab	44.93±3.76 c	53.58±1.27 a	44.17±3.32 c	733.58±21.76 a	683.49±17.88 a	723.86±32.39 a	622.67±23.53 a
	10	49.33±3.34 ab	54.76±4.76 a	51.65±1.26 a	49.84±2.77 ab	659.58±19.48 a	632.43±26.72 a	644.78±21.56 a	574.69±11.33 a
	11	67.17±3.24 ab	65.07±2.23 ab	70.68±1.76 a	63.62±1.14 b	602.61±19.19 a	668.78±5.91 a	641.03±25.59 a	659.27±14.65 a
根 root	7	81.50±2.08 b	127.15±4.30 a	132.87±3.01 a	129.07±4.53 a	603.55±7.74 b	647.71±5.91 a	625.38±4.47 ab	611.98±22.67 ab
	8	84.19±3.44 c	102.42±2.87 a	104.58±2.04 a	99.67±1.49 ab	633.65±18.56 a	621.43±15.47 a	594.47±16.55 a	608.39±19.22 a
	9	82.66±2.97 b	86.41±3.26 bc	89.97±4.28 c	80.55±2.05 a	667.21±11.34 a	606.77±10.31 a	574.82±12.56 a	589.52±10.75 a
	10	79.54±3.31 a	72.33±2.05 b	74.28±3.89 b	67.65±4.51 c	643.65±22.47 a	576.43±19.54 a	556.61±21.03 a	591.80±9.46 a
	11	73.97±2.49 a	60.18±0.94 b	62.17±1.56 b	58.08±1.20 c	577.72±9.74 a	501.38±12.63 ab	524.47±14.57 b	522.44±11.74 ab

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