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Hyperspectral imaging technology to detect the vigor of thermal-damaged quercus variabilis seeds

Journal of Forestry Research 2021年第2期32卷 461-469页

作者： Lei Pang Jiang Xiao Jingjing Ma Lei Yan School of Technology Beijing Forestry UniversityBeijing 100083People’s Republic of China

This study investigated the feasibility of hyperspectral imaging techniques to estimate the vigor of heatdamaged quercus variabilis *** thermal damage grades were classified according to heat treatment duration(0,2,5,and 10 h).After obtaining hyperspectral images with a 370–1042 nm hyperspectral imager that included visible and near infrared light,germination was tested to confirm *** Savitzky–Golay(SG)second derivative was used to preprocess the spectrum to reduce any noise *** successive projections algorithm(SPA),principal component analysis,and local linear embedding algorithm were used to extract the characteristic spectral bands related to seed ***,a model for seed vigor classifi-cation of *** s based on partial least squares support vector machine(LS-SVM)with different spectral data sets was *** results show that the spectrum after SG second derivative preprocessing was better for developing the model,and SPA performed the best among the three feature band selection *** combination SG second derivative-LS-SVM provided the best classification model for *** seed vigor,with the prediction set reaching 98.81%.This study provides an important basis for rapid and nondestructive assessment of the vigor of heat-damaged seeds using hyperspectral imaging techniques.

关键词： Seed vigor level quercus variabilis Heat damage Hyperspectral Least squares support vector machine

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Infl uence of the slope aspect on the ectomycorrhizal fungal community of quercus variabilis Blume in the middle part of the Taihang Mountains,North China

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Journal of Forestry Research 2021年第1期32卷 385-400页

作者： Songpo Wei Yijing Song Liming Jia College of Forestry Beijing Forestry UniversityBeijing 100083People’s Republic of China

The slope aspect is one of the most critical topographic factors in mountainous *** is known,however,about the eff ect of the aspect on the ectomycorrhizal(ECM)fungal ***,we know very little about the composition of ECM fungal communities associated with quercus variabilis,which is widely distributed in East *** this study,we compared the richness,community composition,and exploration types of ECM fungi associated with *** between predominantly south-and north-facing slopes in the Taihang Mountain,North China for the fi rst *** was extracted from the root tips of ***,and Illumina MiSeq sequencing was used to identify ECM *** total,168 operational taxonomic units belonging to 28 genera were detected,and the ECM community was found to be dominated by Russula,Inocybe,Tomentella,Scleroderma,and *** with the north-facing slopes,the ECM communities on the south-facing slopes had higher *** community composition and exploration types were directly aff ected by the slope ***,the aspect-induced edaphic variables,such as total phosphorus,total nitrogen,total potassium,pH,and soil water content,were important sources of variation in ECM fungal richness and distributions of exploration *** erent genera tended to be distributed in various slope ***,Genea,and Clavulina were signifi cantly enriched in north-facing slopes,while Geopora,Helvelosebacina,Scleroderma,Gyroporus,Astraeus,Boletus,Tricholoma,Hebeloma,Cortinarius and unclassifi ed Thelephoraceae were more abundant in south-facing *** ECM fungi were obviously enriched in the south-facing slope,but there was no statistical diff erence between hydrophilic among the south-and north-facing *** study deepened our knowledge of the aspect-driven variation in ECM fungal communities associated with ***.

关键词： Ectomycorrhizal community Illumina sequencing quercus variabilis Slope aspect Edaphic factors

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Effects of Root Cutting on Morphological Characteristics and Endogenous Hormone Levels of quercus variabilis Seedlings

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Phyton-International Journal of Experimental Botany 2023年第10期92卷 2907-2920页

作者： Ruoyi Ni Hao Dou Shuwen Bi Tiantian Wang Jin’e Quan Xitian Yang College of Forest Henan Agricultural UniversityZhengzhou450002China

The objective of this study was to investigate the effects of root cutting stress on the dynamic changes of endogenous hormone content and growth characteristics of quercus variabilis roots,and to explore the physiological role of endogenous hormones in regulating root-crown interactions in the short *** morphological characteristics and endogenous hormone contents of normal roots(no root cutting,CK)and cut roots(cut by 1/3 of the length of the main root,RP)were determined by liquid chromatography,which was combined with mass spectrometry at different levels of different developmental *** results showed that the root growth indexes and root endogenous hormones in the RP group were superior to those in the CK *** comprehensive analysis of endogenous hormones,it was found that the crosstalk of IAA,JA,ABA and SA could activate the root growth *** the root cutting treatment,the root growth of quercus variabilis seedlings could compensate for the inhibition of taproot growth by promoting lateral root *** growth and development of compensatory lateral roots contribute to the increase the total root length of plants,thus promoting the absorption of water and *** is speculated that plant hormones may be the key factors affecting their development,but this is not only related to the content of a single hormone,but more importantly,it is the interaction between various hormones.

关键词： quercus variabilis root cutting injury endogenous hormones root morphology

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Classification of Natural Types of quercus variabilis

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Plant Diseases and Pests 2023年第2期14卷 23-26页

作者： Jianyun ZHOU College of Forestry Northwest A&F UniversityYangling 712100China

[Objectives]The paper was to classify natural types of quercus variabilis and to study its regularity of variation.[Methods]Through the analysis of correlation coefficient matrix of tree age,DBH,tree height,breast height and bark thickness,petiole length,leaf width and leaf length,the breast height and bark thickness and petiole length were chosen as the main indices for classifying natural types of ***.[Results]There were 4 natural types of *** in Shaanxi Province,including long-petiole-thick-bark type,short-petiole-thick-bark type,long-petiole-thin-bark type and short-petiole-thin-bark *** short-petiole-thick-bark type accounted for the largest proportion in *** population(34.44%).On the northern slope of Bashan Mountains and the Huanglong Mountains,the short-petiole-thick-bark type was the dominant type,while on the northern slope of Qinling Mountains the long-petiole-thick-bark type accounted for a larger proportion.[Conclusions]This study will provide a basic foundation for making full use of excellent types of *** natural resources.

关键词： quercus variabilis Natural type Classification Shaanxi Province

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