桃花心木木材定量解剖特征变异性及其识别

doi:10.11707/j.1001-7488.LYKX20220456

Abstract

Abstract:

Objective: Based on quantitative wood anatomy (QWA) method, the wood anatomical features of three Swietenia species were analyzed to reveal the patterns of their interspecific and intraspecific variation, and provide a scientific basis for accurate wood identification at the level of “species”. Method: The microscopic images of S. macrophylla, S. mahagoni and S. humilis were collected from transverse, radial and tangential section respectively using a microscope, and the quantitative data of seven anatomical features of wood, i.e. the vessel element length (VEL), tangential diameter of vessel lumina (TVD), vessels per square milimeter (FOV), fiber length (FL), ray width (RW), ray height (RH) and rays per millimeter (RPMM) were measured by image analysis software to investigate the interspecific and intraspecific variation of wood anatomical features. Additionally, the random forest algorithm was used to discriminate three Swietenia species at the species level, and the contributions of different quantitative anatomical features to wood identification were comparatively analyzed. Result: The wood anatomical features of the three Swietenia species were highly closed in vessel, axial parenchyma and wood rays under microscope, therefore it is difficult to distinguish them artificially. However there were significant difference among three Swietenia species in six quantitative wood anatomical features except for RW. The random forests algorithm has a discrimination accuracy of 86.67% for Swietenia mahagoni. VEL showed the highest value of the mean decrease accuracy (3.956) and the mean decrease Gini (6.311), followed by the TVD. RW exhibited the lowlest value of the mean decrease accuracy (0.797) and the mean decrease Gini (2.175). Among the seven wood anatomical features, VEL exhibit the most contribution to the wood identification accuracy, while the RW had the least contribution. Conclusion: This study reveals the interspecific and intraspecific variation of three selected Swietenia species and the key quantitative anatomical features in wood identification based on quantitative wood anatomy, which provided a scientific basis of the accurate wood identification at “species” level.

Key words: Swietenia, quantitative wood anatomy, variation pattern, random forest, wood identification

CLC Number:

S781

Shoujia Liu,Tuo He,Yang Lu,Lichao Jiao,Juan Guo,Wiedenhoeft Alex C,Yafang Yin. Quantitative Anatomy Analysis on Wood Feature Variability and Wood Identification of Swietenia Species[J]. Scientia Silvae Sinicae, 2024, 60(5): 169-176.

Figures/Tables 6

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大叶桃花心木Swietenia macrophylla		桃花心木Swietenia mahagoni		矮叶桃花心木Swietenia humilis
标本号 Specimen code	产地 Place of origin	标本号 Specimen code	产地 Place of origin	标本号 Specimen code	产地 Place of origin
RBw3805	阿根廷Argentina	MADw1203	古巴Cuba	MADw725	哥斯达黎加Costa Rica
RBw3806	美国America	MADw2671	美国America	MADw2414	美国America
RBw3809	阿根廷Argentina	MADw2676	美国America	MADw5109	萨尔瓦多El Salvador
RBw3813	阿根廷Argentina	MADw3905	波多黎各Puerto Rico	MADw8678	危地马拉Guatemala
RBw3815	阿根廷Argentina	MADw3939	美国America	MADw11879	墨西哥Mexico
RBw3821	阿根廷Argentina	MADw4780	美国America	MADw33827	危地马拉Guatemala
RBw3848	波多黎各Puerto Rico	MADw5382	菲律宾Philippines	SJRw3060	美国America
RBw4039	阿根廷Argentina	MADw7264	印尼Indonesia	SJRw4765	利比里亚Liberia
RBw4570	圭亚那Guyana	MADw8567	多米尼加Dominica	SJRw5359	菲律宾Philippines
RBw7214	菲律宾Philippines	MADw8676	美国America	SJRw5894	美国America
MADw2395	哥伦比亚Colombia	MADw8677	美国America	SJRw7484	韩国Korea
MADw3056	委内瑞拉Venezuela	MADw10139	古巴Cuba	SJRw8902	美国America
MADw3575	哥斯达黎加Costa Rica	MADw11039	海地Haiti	SJRw9630	墨西哥Mexico
MADw3576	哥斯达黎加Costa Rica	MADw13405	古巴Cuba	SJRw10364	厄瓜多尔Ecuador
MADw4039	委内瑞拉Venezuela	MADw13753	古巴Cuba	SJRw38312	印尼Indonesia

定量解剖特征 Quantitative wood anatomical features		大叶桃花心木 Swietenia macrophylla	桃花心木 Swietenia mahagoni	矮叶桃花心木 Swietenia humilis
导管分子长度 Vessel element length/μm	平均值±标准差Mean±SD	534±57a	422±53b	439±62b
	最小值Min.	426	347	324
	最大值Max.	618	524	583
管孔弦向直径 Tangential diameter of vessel lumina/μm	平均值±标准差Mean±SD	150±17a	117±15b	144±17a
	最小值Min.	121	86	106
	最大值Max.	182	141	170
管孔频率 Vessels per square milimeter/mm^?2	平均值±标准差Mean±SD	7.2±4.2b	11.3±3.5a	9.7±3.1a
	最小值Min.	5.2	5.5	5.9
	最大值Max.	9.7	19.5	16.6
木纤维长度 Fiber length/μm	平均值±标准差Mean±SD	1 295±99a	1 148±93b	1 217±119ab
	最小值Min.	1 028	993	1 023
	最大值Max.	1423	1317	1423
木射线宽度 Ray width/μm	平均值±标准差Mean±SD	50±11a	55±12a	52±10a
	最小值Min.	33	38	35
	最大值Max.	81	78	65
木射线高度 Ray height/μm	平均值±标准差Mean±SD	389±54.7a	318±42b	331±59b
	最小值Min.	274	262	244
	最大值Max.	522	397	412
木射线频率 Rays per millimeter/mm^?2	平均值±标准差Mean±SD	4.9±0.4b	5.6±0.5b	5.1±0.7a
	最小值Min.	4.0	4.8	4.1
	最大值Max.	5.6	6.5	6.5

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Quantitative Anatomy Analysis on Wood Feature Variability and Wood Identification of Swietenia Species

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