Effects of decay class and diameter class on moisture content and wood density in a typical mixed broadleaf-Korean pine forest

doi:10.3969/j.issn.1000-2006.201812016

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (2): 133-140.doi: 10.3969/j.issn.1000-2006.201812016

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Effects of decay class and diameter class on moisture content and wood density in a typical mixed broadleaf-Korean pine forest

HAN Yuna¹(), ZHANG Yu¹, JIN Guangze¹^,²^,^*()

1. Center for Ecological Research, Northeast Forestry University, Harbin 150040, China
2. Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education, Northeast Forestry University, Harbin 150040, China

Received:2018-12-08 Revised:2019-04-20 Online:2020-03-30 Published:2020-04-01
Contact: JIN Guangze E-mail:nmghanyn@163.com;taxus@126.com

Abstract

Abstract:

【Objective】Moisture content and wood density are important physical properties of woody debris. However, the effects of decay class and diameter class on the wood density and moisture content of the main species in a typical mixed broadleaf-Korean pine (Pinus koraiensis) forest remain unclear. This study provides basic data on the moisture content and wood density of sapwood and heartwood of the main tree species in a typical mixed broadleaf-Korean pine forest and examines the variation patterns of moisture content and wood density with decay class and diameter class. 【Method】 The main tree species,Pinus koraiensis, Abies nephrolepis, Betula costata, Acer spp., Tilia spp., Fraxinus mandshurica and Ulmus spp. in the mixed forest were chosen for this study. The study samples were divided into five decay classes (Ⅰ-Ⅴ), and three diameter classes (ⅰ-ⅲ) were sampled for each decay class. The study aimed to explore the effects of decay class and diameter class on the moisture content and wood density of the different structural components (sapwood and heartwood) of the main tree species. 【Result】The moisture content increased with increasing decay class, but the wood density decreased significantly. The wood density of sapwood was significantly higher than that of the heartwood in decay class Ⅲ and overall; however, in the other decay classes, the wood density did not significantly differ between sapwood and heartwood. The moisture content and wood density of sapwood and heartwood were significantly different among some tree species in most decay classes. There was no significant difference in moisture content and wood density among the diameter classes. The moisture content of sapwood and heartwood was significantly different among some tree species in diameter class ⅰ, and the wood density of sapwood and heartwood was significantly different among some tree species in diameter class ⅰ and ⅲ. 【Conclusion】Therefore, influenced by different factors, the moisture content and wood density of woody debris exhibited unique patterns, and decay class and interspecies difference were important factors affecting the variations in the moisture content and wood density.

Key words: woody debris, moisture content, wood density, decay classes, diameter classes, mixed broadleaved-Korean pine forest

CLC Number:

S791.247

HAN Yuna, ZHANG Yu, JIN Guangze. Effects of decay class and diameter class on moisture content and wood density in a typical mixed broadleaf-Korean pine forest[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2020, 44(2): 133-140.

Figures/Tables 5

Fig.1

Table 1

Table 2

Table 4

References 37

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自变量 independent variable	边材含水率 moisture content of sapwood										心材密度 density of heartwood
自变量 independent variable	回归系数 RC		P	回归系数 RC		P	回归系数 RC		P	回归系数 RC		P
腐烂等级 decay class	7.468		0.003	-0.062		< 0.001	8.987		< 0.001	-0.068		< 0.001
径级 diameter class	1.062		0.742	-0.036		> 0.05	2.761		> 0.05	-0.020		> 0.05
腐烂等级×径级 decay class×diameter class	0.855		0.466	0.006		> 0.05	-0.006		> 0.05	0.007		> 0.05
决定系数 R²		0.268			0.187			0.239			0.230

因子 factor	含水率moisture content		木材密度wood density
因子 factor	F	P	F	P
树种 tree species	15.729	<0.05	15.713	<0.001
腐烂等级 decay class	61.391	<0.001	26.349	<0.001
径级 diameter class	4.020	0.019	1.135	>0.05
结构组分 structural component	0.913	<0.05	6.948	0.009
树种×腐烂等级 species×decay class	3.908	<0.001	3.686	<0.001
树种×径级 species×diameter class	4.783	<0.001	3.332	<0.001
腐烂等级×径级 decay class×diameter class	0.442	>0.05	3.725	0.006
树种×结构组分 species×structural component	1.400	>0.05	0.663	>0.05
腐烂等级×结构组分 decay class ×structural component	0.298	>0.05	1.463	>0.05
径级×结构组分 diameter class×structural component	0.056	>0.05	1.207	>0.05
树种×腐烂等级×径级 species×decay class×diameter class	2.223	0.001	2.690	<0.001
树种×腐烂等级×结构组分 species×decay class ×structural component	0.557	>0.05	0.564	>0.05
树种×径级×结构组分 species×diameter class×structural component	0.562	>0.05	0.486	>0.05
腐烂等级×径级×结构组分 decay class×diameter class×structural component	0.319	>0.05	0.795	>0.05
树种×腐烂等级×径级×结构组分 species×decay class×diameter class×structural component	0.581	>0.05	0.414	>0.05

结构组分 structural component	因子 factor		树种 tree species
结构组分 structural component	因子 factor		Pk	An	Bc	Acer	Tili	Fm	Ulmu
边材 sapwood	腐烂等级 decay class	Ⅰ	14.7±1.3 bB	41.6±7.1 a	37.1±4.1 aB	31.6±3.1 aB	32.7±3.3 aB	41.1±2.9 a	27.8±4.9 b
		Ⅱ	34.3±7.7 cAB	51.0±7.6 ac	59.3±7.2 abA	61.7±5.3 aA	44.7±3.4 acB	46.9±1.7 ac	36.5±4.7 bc
		Ⅲ	46.9±6.7 abA	56.5±8.4 ab	64.8±6.4 aA	53.4±6.2 abA	65.5±4.2 aA	47.0±6.5 ab	31.4±4.3 b
	径级 diameter class	ⅰ	44.2±6.5 ac	27.5±5.3 bcB	58.4±6.3 a	49.4±6.6 ab	46.1±6.0 ac	48.9±2.9 ab	21.3±4.0 c
		ⅱ	43.7±7.4	56.6±6.9 A	50.1±6.1	48.7±6.7	47.8±4.4	44.8±3.9	36.8±3.7
		ⅲ	55.3±7.3	64.9±5.2 A	51.8±8.5	46.9±6.2	50.0±8.0	40.4±2.6	37.6±4.5
心材 heartwood	腐烂等级 decay class	Ⅰ	34.4±10.5	37.1±7.0	41.9±3.9 B	29.9±29.9 B	32.7±4.2 C	39.3±3.1	25.1±4.8
		Ⅱ	33.7±7.7 b	40.8±6.3 ab	60.2±5.7 aA	58.5±5.7 aA	55.0±5.5 abB	48.7±2.1 ab	33.8±6.3 b
		Ⅲ	58.4±7.8 a	57.2±6.0 a	62.8±5.7 aA	56.1±6.8 aA	72.7±2.9 aA	49.7±7.1 ab	28.0±5.3 b
	径级 diameter class	ⅰ	34.2±6.8 ab	33.3±5.7 ab	55.5±6.6 a	52.2±7.5 a	53.2±7.6 a	48.9±3.4 a	18.4±3.9 bB
		ⅱ	47.3±7.8	47.9±7.9	55.6±5.5	48.2±5.1	52.7±5.1	41.1±4.1	30.2±4.9 AB
		ⅲ	60.1±7.1	55.0±4.9	53.4±5.9	43.5±6.8	54.5±9.0	47.3±3.7	38.3±5.6 A

结构组分 structural component	因子 factor		树种 tree species
结构组分 structural component	因子 factor		Pk	An	Bc	Acer	Tili	Fm	Ulmu
边材 sapwood	腐烂等级 decay class	Ⅰ	0.39±0.02 abA	0.29±0.02 b	0.37±0.05 b	0.43±0.02 abA	0.31±0.03 b	0.39±0.05 ab	0.55±0.08 a
		Ⅱ	0.35±0.03 abA	0.29±0.03 ab	0.29±0.05 ab	0.23±0.03 bB	0.32±0.05 ab	0.43±0.04 a	0.42±0.03 a
		Ⅲ	0.23±0.04 bB	0.28±0.03 ab	0.25±0.03 b	0.35±0.03 abA	0.29±0.04 ab	0.35±0.05 ab	0.42±0.02 aα
	径级 diameter class	ⅰ	0.31±0.03 bA	0.31±0.02 b	0.32±0.04 b	0.34±0.03 ab	0.34±0.03 ab	0.39±0.04 ab	0.50±0.05 a
		ⅱ	0.29±0.03 AB	0.28±0.03	0.28±0.05	0.32±0.03	0.34±0.03	0.41±0.05	0.42±0.04
		ⅲ	0.18±0.03 cB	0.26±0.02 bc	0.31±0.05 ac	0.37±0.05 ab	0.22±0.06 bc	0.38±0.04 ab	0.47±0.07 a
心材 heartwood	腐烂等级 decay class	Ⅰ	0.29±0.05 bA	0.32±0.04 ab	0.39±0.05 abA	0.39±0.03 ab	0.31±0.02 bA	0.40±0.04 ab	0.51±0.06 aA
		Ⅱ	0.36±0.03 abA	0.27±0.01 ab	0.29±0.04 abAB	0.27±0.03 ab	0.26±0.05b AB	0.40±0.03 a	0.40±0.03 abAB
		Ⅲ	0.15±0.02 bB	0.28±0.02 ab	0.22±0.03 abB	0.32±0.04 a	0.20±0.02 abB	0.27±0.05 ab	0.27±0.04 abBβ
	径级 diameter class	ⅰ	0.31±0.03 abA	0.26±0.03 ab	0.30±0.04 ab	0.27±0.03 abB	0.22±0.02 bAB	0.40±0.04 a	0.44±0.06 a
		ⅱ	0.25±0.03 AB	0.31±0.03	0.27±0.05	0.30±0.03 AB	0.31±0.03 A	0.36±0.03	0.40±0.02
		ⅲ	0.17±0.03 cB	0.30±0.01 ac	0.32±0.05 ac	0.40±0.04 aA	0.20±0.04 bcB	0.35±0.05 ab	0.350.07 ac

Effects of decay class and diameter class on moisture content and wood density in a typical mixed broadleaf-Korean pine forest

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