A study on growth and aboveground biomass production of juvenile Cyclocarya paliurus plantations

doi:10.12302/j.issn.1000-2006.202010032

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (1): 138-144.doi: 10.12302/j.issn.1000-2006.202010032

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A study on growth and aboveground biomass production of juvenile Cyclocarya paliurus plantations

SUN Caowen(), ZHONG Wenwen, FU Xiangxiang, SHANG Xulan^*(), FANG Shengzuo

College of Forestry,Nanjing Forestry University,Nanjing 210037,China

Received:2020-10-21 Accepted:2021-03-02 Online:2022-01-30 Published:2022-02-09
Contact: SHANG Xulan E-mail:scw19871217@126.com;shangxulan@njfu.edu.cn

Abstract

Abstract:

【Objective】Cyclocarya paliurus is a highly valued and multiple-function tree species with high potential for the use of its leaves. The aims of this study is to investigate the aboveground biomass-growth patterns of juvenile C. paliurus. 【Method】 Six-year-old C. paliurus plantations were established to investigate the growth characteristics and biomass distribution. Thirty-seven trees were selected to analyze the correlation between aboveground biomass and tree growth factors. Based on this, the biomass estimation equation was screened using 19 equations.【Result】 There were significant correlations between biomass production and diameter at breast height (DBH), and the following four models were selected as the best equations for biomass estimation: ① for stem biomass, W=0.15 D^2.1, R²=0.982; ② for branch biomass, W=0.05 D^1.88, R²=0.864; ③ for leaf biomass, W=0.07 D^1.55, R²=0.802; ④ for aboveground biomass, W=0.28 D^1.95, R²=0.976. 【Conclusion】 At different densities, the canopy of the juvenile Cyclocarya paliurus plantations at six years was not closed yet; therefore, DBH, tree height, and volume growth per plant were less affected by the density effect. The biomass distribution patterns of individual trees were similar, and the distribution pattern of aboveground organs was as follows: stem (73%) > branch (16%) > leaf (11%) at the age of six years.

Key words: Cyclocarya paliurus plantation, tree growth, biomass model, leaf-used forest

CLC Number:

S718

SUN Caowen, ZHONG Wenwen, FU Xiangxiang, SHANG Xulan, FANG Shengzuo. A study on growth and aboveground biomass production of juvenile Cyclocarya paliurus plantations[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2022, 46(1): 138-144.

Figures/Tables 7

Table 1

Table 2

Table 3

Table 4

Table 5

Selected biomass models of C. paliurus"

干生物量stem biomass			枝生物量branch biomass			叶生物量leaf biomass			地上部分生物量up ground biomass
模型model	R²	SSR	模型model	R²	SSR	模型model	R²	SSR	模型model	R²	SSR
W=0.15 D²^.¹	0.98	0.47	W=0.56 D-0.706 H+0.72 V_C	0.92	11.46	W=0.163 D-0.182 H+0.431 V_C	0.81	8.05	W=0.28 D¹^.⁹⁵	0.98	0.54
W=0.019+0.033(D²H)- 8.501×10^-6(D²H)²	0.95	130.34	W=0.045 D¹^.⁵²⁶ $C W 0.767$	0.92	11.88	W=0.225 D⁰^.⁴⁷² $V C 0.812$	0.80	8.47	W=0.783+0.043(D²H)- 1.078×10^-5(D²H)²	0.96	198.81
W=0.097(D²H)⁰^.⁷⁹⁷	0.94	151.23	W=0.083 D¹^.³ $V C 0.572$	0.91	13.00	W=0.07 D¹^.⁵⁵	0.80	3.40	W=0.409 D¹^.⁵⁸⁸ $V C 0.282$	0.95	210.83
W=0.186 D²^.¹¹² $C W - 0.186$	0.93	168.04	W=0.025(D²H)⁰^.⁷⁸⁴	0.87	18.91	W=0.094 D⁰^.⁹¹³ $C W - 0.897$	0.80	8.82	W=0.16(D²H)⁰^.⁷⁷¹	0.95	221.94
W=0.216 D¹^.⁸⁴¹ $V C 0.124$	0.93	169.71	W=0.33+0.06(D²H)- 9.987×10^-7(D²H)²	0.87	19.10	W=0.36 $V C 1.14$	0.78	3.89	W=0.297 D¹^.⁸⁷³ $C W 0.105$	0.95	232.52
W=2.152+0.022(D²H)	0.93	176.61	W=0.05 D¹^.⁸⁸	0.86	3.18	W=0.27×1.26^D	0.76	4.08	W=3.488+0.03(D²H)	0.94	273.26
W=0.88×1.36^D	0.90	2.56	W=0.581+0.005(D²H)	0.86	19.73	W=0.06(D²H)⁰^.⁵⁷⁸	0.75	10.86	W=1.44×1.33^D	0.93	1.69

Table 5

Table 6

Table 7

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林分密度/ (株·hm^-2) stand density	树高生长量/(m·a^-1) tree height growth		胸径生长量/(cm·a^-1) DBH growth		材积生长量/(m³·a^-1) volume growth
林分密度/ (株·hm^-2) stand density	平均 average	连年 annual	平均 average	连年 annual	平均 average	连年 annual
521	0.95±0.10 a	0.63±0.43 a	1.36±0.05 a	2.00±0.23 a	0.002 9±0.000 3 a	0.008 3±0.002 3 a
694	0.95±0.07 a	0.71±0.31 a	1.33±0.07 a	2.27±0.29 a	0.002 8±0.000 1 a	0.008 7±0.000 4 a
1 041	0.93±0.11 a	0.82±0.40 a	1.31±0.41 a	2.41±0.49 a	0.002 8±0.000 1 a	0.009 9±0.000 5 a

径阶/cm diameter class	株数 number	胸径/cm DBH
径阶/cm diameter class	株数 number	均值mean	CV	均值mean	CV	均值mean	CV	均值mean	CV	均值mean	CV
2	1	1.80		2.70		2.00		1.50		0.79
4	5	4.42±0.62	0.14	4.76±0.57	0.12	3.18±0.43	0.14	2.48±0.70	0.28	2.09±0.86	0.41
6	7	6.09±0.36	0.06	5.29±0.65	0.12	3.71±0.62	0.17	2.99±0.56	0.19	2.93±0.85	0.29
8	10	7.73±0.46	0.06	6.30±0.58	0.09	4.50±0.64	0.14	3.37±0.30	0.09	3.95±0.72	0.18
10	8	9.55±0.49	0.05	7.36±0.87	0.12	5.26±0.78	0.15	4.03±0.45	0.11	5.46±0.68	0.12
12	5	11.80±0.32	0.03	7.86±0.39	0.05	5.98±0.40	0.07	4.48±0.70	0.16	6.96±0.94	0.14
14	1	13.10		8.10		6.10		4.90		7.74
合计total	37	7.90±2.65	0.34			4.51±1.17	0.26	3.46±0.88	0.26	4.26	0.44

径阶/cm diameter class	干stem			枝branch			叶leaf
径阶/cm diameter class	鲜质量/kg fresh weight	干质量/kg dry weight	含水率/% moisture content	鲜质量/kg fresh weight	干质量/kg dry weight	含水率/% moisture content	鲜质量/kg fresh weight	干质量/kg dry weight	含水率/% moisture content
4	7.7	4.5	41.6	2.8	1.4	50.0	3.1	1.5	51.6
6	12.1	7.4	38.8	6.5	2.4	63.1	4.8	2.2	54.2
8	16.5	8.7	47.3	5.4	2.3	57.4	2.8	1.4	50.0
10	20.2	10.7	47.0	7.1	3.5	50.7	4.8	2.1	56.3
12	41.8	22.3	46.7	14.7	7.1	51.7	9.5	4.4	53.7

生物量因子 biomass factor	树高 height	胸径 DBH	冠幅 crown width	树冠体积 crown volume
叶leaf	0.79^**	0.61^**	0.75^**	0.84^**
枝branch	0.98^**	0.92^**	0.85^**	0.91^**
干stem	0.98^**	0.99^**	0.93^*	0.96^*
地上部分up ground	0.98^**	0.98^**	0.94^*	0.96^**

林分密度/ (株·hm^-2) stand density	干生物量 stem biomass		枝生物量 branch biomass		叶生物量 leaf biomass		地上部分生物量 upground biomass
林分密度/ (株·hm^-2) stand density	平均木/ (kg·株^-1) single tree	林分/ (kg·hm^-2) stands	平均木/ (kg·株^-1) single tree	林分/ (kg·hm^-2) stands	平均木/ (kg·株^-1) single tree	林分/ (kg·hm^-2) stands	平均木/ (kg·株^-1) single tree	林分/ (kg·hm^-2) stands
521	11.3±2.10 a	5 889.0±1 071.8 c	2.4±0.36 a	1 246.9±205.20 c	1.7±0.26 a	882.2±120.0 c	15.5±2.60 a	8 059.9±1 366.3 c
694	11.9±1.36 a	8 228.5±964.7 b	2.5±0.23 a	1 760.5±152.26 b	1.7±0.15 a	1 221.4±105.0 b	16.2±1.78 a	11 238.2±1 225.9 b
1 041	11.4±0.76 a	11 926.4±786.2 a	2.5±0.15 a	2 552.7±147.71 a	1.7±0.10 a	1 787.1±84.1 a	15.7±0.93 a	16 336.7±1 003.2 a

A study on growth and aboveground biomass production of juvenile Cyclocarya paliurus plantations

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部位 part	生物量预估模型 equation	R²	SSR
干stem	W=0.15 D^2.1	0.98	0.47
枝branch	W=0.05 D^1.88	0.86	3.18
叶leaf	W=0.07 D^1.55	0.80	3.40
地上部分up ground	W=0.28 D^1.95	0.98	0.54

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