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Using machine learning algorithms to estimate stand volume growth of Larix and Quercus forests based on national-scale Forest Inventory data in China

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Forest Ecosystems 2022年第3期9卷 396-406页

作者： Huiling Tian Jianhua Zhu Xiao He Xinyun Chen Zunji Jian chenyu li Qiangxin Ou Qi li Guosheng Huang Changfu liu Wenfa Xiao Ecology and Nature Conservation Institute Chinese Academy of ForestryKey Laboratory of Forest Ecology and Environment of National Forestry and Grassland AdministrationBeijing100091China Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing210037China Institute of Forest Resource Information Techniques Chinese Academy of ForestryKey Laboratory of Forest Management and Growth ModelingNational Forestry and Grassland AdministrationBeijing100091China Academy of Forest Inventory and Planning National Forestry and Grassland AdministrationBeijing100714China School of Forestry and Landscape Architecture Anhui Agricultural UniversityHefei230036AnhuiChina

Estimating the volume growth of forest ecosystems accurately is important for understanding carbon sequestration and achieving carbon neutrality ***,the key environmental factors affecting volume growth differ across various scales and plant functional *** study was,therefore,conducted to estimate the volume growth of Larix and Quercus forests based on national-scale forestry inventory data in China and its influencing factors using random forest *** results showed that the model performances of volume growth in natural forests(R^(2)=0.65 for Larix and 0.66 for Quercus,respectively)were better than those in planted forests(R^(2)=0.44 for Larix and 0.40 for Quercus,respectively).In both natural and planted forests,the stand age showed a strong relative importance for volume growth(8.6%–66.2%),while the edaphic and climatic variables had a limited relative importance(linear increase in planted Quercus *** the specific locations(i.e.,altitude and aspect)of sampling plots exhibited high relative importance for volume growth in planted forests(4.1%–18.2%).Altitude positively affected volume growth in planted Larix forests but controlled volume growth negatively in planted Quercus ***,the effects of other environmental factors on volume growth also differed in both stand origins(planted versus natural)and plant functional types(Larix versus Quercus).These results highlighted that the stand age was the most important predictor for volume growth and there were diverse effects of environmental factors on volume growth among stand origins and plant functional *** findings will provide a good framework for site-specific recommendations regarding the management practices necessary to maintain the volume growth in China's forest ecosystems.

关键词： Stand volume growth Stand origin Plant functional type National forest inventory data Random forest algorithms

Holder Regularity for Abstract Fractional Cauchy Problems with Order in(0,1)

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Journal of Applied Mathematics and Physics 2018年第1期6卷 310-319页

作者： chenyu li Miao li Department of Mathematics Sichuan University Chengdu China

In this paper, we study the regularity of mild solution for the following fractional abstract Cauchy problem Dt αu(t)=Au(t)+f(t), t ∈ (0,T] u(0)= x0 on a Banach space X with order α ∈ (0,1), where the fractional derivative is understood in the sense of Caputo fractional derivatives. We show that if A generates an analytic α-times resolvent family on X and f ∈ Lp ([0,T];X) for some p > 1/α, then the mild solution to the above equation is in Cα-1/p[ò,T] for every ò > 0. Moreover, if f is H?lder continuous, then so are the Dt αu(t) and Au(t).

关键词： Fractional Cauchy Problem Fractional Resolvent Family Generator Regularity Holder Continuity

Axon-like aligned conductive CNT/GelMA hydrogel fibers combined with electrical stimulation for spinal cord injury recovery

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Bioactive Materials 2024年第5期35卷 534-548页

作者： Shenglian Yao Yongdong Yang chenyu li Kaitan Yang Xin Song Chuanhong li Zheng Cao He Zhao Xing Yu Xiumei Wang Lu-Ning Wang School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China Key Laboratory of Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Department of Orthopedics Dongzhimen HospitalBeijing University of Chinese Medicine5 Hai Yun CangBeijing100700China

Rehabilitation and regenerative medicine are two promising approaches for spinal cord injury(SCI)recovery,but their combination has been *** biomaterials could bridge regenerative scaffolds with electrical stimulation by inducing axon regeneration and supporting physiological electrical signal ***,we developed aligned conductive hydrogel fibers by incorporating carbon nanotubes(CNTs)into methacrylate acylated gelatin(GelMA)hydrogel via rotating liquid bath *** electrospun CNT/GelMA hydrogel fibers mimicked the micro-scale aligned structure,conductivity,and soft mechanical properties of neural *** in vitro studies,CNT/GelMA hydrogel fibers supported PC12 cell proliferation and aligned adhesion,which was enhanced by electrical stimulation(ES).Similarly,the combination of aligned CNT/GelMA hydrogel fibers and ES promoted neuronal differentiation and axon-like neurite sprouting in neural stem cells(NSCs).Furthermore,CNT/GelMA hydrogel fibers were transplanted into a T9 transection rat spinal cord injury model for in vivo *** results showed that the incorporating CNTs could remain at the injury site with the GelMA fibers biodegraded and improve the conductivity of regenerative *** aligned structure of the hydrogel could induce the neural fibers regeneration,and the ES enhanced the remyelination and axonal *** assessments and electrophysiological results suggest that the combination of aligned CNT/GelMA hydrogel fibers and ES could significantly restore motor function in *** study demonstrates that conductive aligned CNT/GelMA hydrogel fibers can not only induce neural regeneration as a scaffold but also support ESto promote spinal cord injury *** conductive hydrogel fibers enable merging regenerative medicine and rehabilitation,showing great potential for satisfactory locomotor recovery after SCI.

关键词： Conductive hydrogel fibers CNT/GelMA Electrical stimulation NSCs differentiation Spinal cord injury

Development of Oligo-GISH kits for efficient detection of chromosomal variants in peanut

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The Crop Journal 2023年第1期11卷 238-246页

作者： Pei Du liuyang Fu Qian Wang Tao Lang Hua liu Suoyi Han chenyu li Bingyan Huang li Qin Xiaodong Dai Wenzhao Dong Xinyou Zhang Henan Academy of Crop Molecular Breeding/State Industrial Innovation Center of Biological Breeding/The Shennong Laboratory/Key Laboratory of Oil Crops in Huang-Huai-Hai Plains Ministry of Agriculture/Henan Provincial Key Laboratory for Oil Crops ImprovementHenan Academy of Agricultural SciencesGraduate T&R Base of Zhengzhou UniversityZhengzhou 450002HenanChina Institute of Biotechnology and Nuclear Technology Sichuan Academy of Agricultural SciencesChengdu 610061SichuanChina

Oligo probe staining is a low-cost and efficient chromosome identification *** this study,oligo genomic in situ hybridization(Oligo-GISH)technology was established in *** A and B subgenome-specific interspersed repeat(IR)oligo probe sets were developed based on clustering and electronic localization of tandem repeat sequences in the reference genome of *** OligoGISH kit was then used to perform staining of 15 Arachis *** A-subgenome probe set stained the chromosomes of A-and E-genome Arachis species,the B-subgenome probe set stained those of B-,F-,K-,and E-genome species,and neither set stained those of H-genome *** results indicate the relationships among the genomes of these Arachis *** Oligo-GISH kit was also used for batch staining of the chromosomes of 389 seedlings from the irradiated M1generation,allowing 67 translocation and deletion lines to be *** Oligo-FISH karyotyping,FISH using single-copy probe libraries,and trait investigation identified seven homozygous chromosomal variants from the M3generation and suggested that there may be genes on chromosome 4B controlling seed number per *** findings demonstrate that the IR probe sets and method developed in this study can facilitate research on distant hybridization and genetic improvement in peanut.

关键词： Peanut Oligo-GISH Genomic relationship Variants Chromosome identification

Metal-organic frameworks for nonlinear optics and lasing

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Information ＆ Functional Materials 2024年第2期1卷 125-159页

作者： chenyu li Guodong Qian Yuanjing Cui State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science&EngineeringZhejiang UniversityHangzhouChina ZJU‐Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhouChina

Nonlinear optics(NLO)is a crucial branch of photonics that greatly facilitates the transmission,processing,and storage of photonic *** meets the needs of the rapidly growing information demands of modern *** with NLO properties and laser capabilities have a wide range of applications in fields such as optical communication,optical information storage,biomedical imaging,laser technology,and quantum information ***-organic frameworks(MOFs)have emerged as particularly exciting hybrid inorganic-organic porous materials that can be easily self‐assembled from corresponding inorganic metal ions/clusters and organic *** structural diversity and flexibility of MOFs offer ample opportunities for the orderly or-ganization of highly hyperpolarizable chromophore molecules within confined *** makes it ideal for NLO signal and laser *** this review,we provide a comprehensive overview of strategies to construct MOFs with NLO and laser properties,as well as recent research developments for enhancing and adjusting these *** analysis of chromophore arrangement and various interactions within the framework,we aim to gain insight into the correlation between MOF structures and optical *** will facilitate the design and synthesis of MOFs with excellent NLO and laser capabilities through the judicious selection of metal ions and organic ***,we outline the future challenges and potential research directions for MOFs in NLO and laser fields.

关键词： lasing metal-organic frameworks multiphoton excited luminescence nonlinear optical properties second harmonic generation

Characterizing PM2.5 in Beijing and Shanxi Province using terahertz radiation

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Frontiers of Optoelectronics 2016年第4期9卷 544-548页

作者： Ning li Honglei ZHAN Kun ZHAO Zhenwei ZHANG chenyu li Cunlin ZHANG Beijing Key Laboratory of Optical Detection Technology for Oil and Gas China University of Petroleum Beijing 102249 China Department of Physics Capital Normal University Beijing 100048 China

Particles of aerodynamic diameter〈2.5 pm （PM/.5） caused extremely severe and persistent haze pollution is of concern in many cities. In this study, samples of PM2.5 were collected from atmosphere environment of Beijing and Shanxi Province, and analyzed using terahertz （THz） radiation. The transmission spectrum of PM2.5 in Shanxi Province had two distinct absorption peaks at 6.0 and 6.7 THz, and the curve was increasing on the whole. However, the transmission spectrum of PMa.5 in Beijing had obviously different variation tendency and the absorption peak was studied by monitoring PM2.5 masses in conjunction with two-dimensional correlation spectro- scopy （2DCOS）. By comparing the pollutant species and concentrations of Shanxi Province and Beijing over the time of collecting samples, the concentrations of sulfate and ammonium were similar, which contributed to emerge absorption bands in the same position. While the concentrations of organic matter （OM）, nitrate, chloride and elemental carbon （EC） were different. Furthermore, dust and some other inorganic ion are unique to Shanxi province, which lead to different variation tendency of the transmission spectrum of PM2.5. These results will be of importance for environmental monitoring and for control- ling PM emissions. According to this research, optical techniques, and especially spectral methods, should be considered for PM2.5 monitoring.

关键词： PM2.5 terahertz two dimensional correlationspectroscopy (2DCOS)

Identification of a stable major QTL for fresh-seed germination on chromosome Arahy.04 in cultivated peanut(Arachis hypogaea L.)

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The Crop Journal 2022年第6期10卷 1767-1773页

作者： Maoning Zhang Qing Zeng Hua liu Feiyan Qi Ziqi Sun lijuan Miao Xiaona li chenyu li Debing liu Junjia Guo Mengyuan Zhang Jing Xu Lei Shi Mengdi Tian Wenzhao Dong Bingyan Huang Xinyou Zhang Innovation Base of Zhengzhou University Henan Academy of Agricultural Sciences/Henan Academy of Crop Molecular Breeding/State Industrial Innovation Center of Biological Breeding/Key Laboratory of Oil Crops in Huang-Huai-Hai PlainsMinistry of Agriculture/Henan Provincial Key Laboratory for Oil Crops ImprovementZhengzhou 450002HenanChina School of Agricultural Sciences Zhengzhou UniversityZhengzhou 450002HenanChina State Key Laboratory of Cotton Biology Institute of Cotton ResearchChinese Academy of Agricultural SciencesAnyang 455000HenanChina College of Applied Science and Technology of Hainan University Danzhou 571737HainanChina College of Agriculture Henan University of Science and TechnologyLuoyang 471023HenanChina

Fresh-seed germination(FSG)impairs peanut production,especially in areas where the peanut harvest season coincides with rainy *** FSG-resistant cultivars by molecular breeding is expected to mitigate yield loss and quality impairment caused by ***,the genetic control of FSG awaits *** this study,FSG at 1,3,5,7,and 9 days post-imbibition in three environments were tested,and quantitative-trait loci(QTL)associated with FSG were mapped in a peanut recombinant inbred line population by leveraging existing high-density peanut genetic *** 24 QTL identified in 13 linkage groups,qFSGA04 was a stable major QTL on linkage group 04(LG04).It was consistently detected in five germination stages and three *** designing and validating DNA markers in the confidence interval of qFSGA04,we identified one single-nucleotide polymorphism and one In Del closely associated with FSG that could be used as linked markers for FSG resistance in peanut breeding.

关键词： Peanut QTL mapping Fresh-seed germination(FSG) Dynamic germination KASP

Interpretable foundation models as decryptors peering into the Earth system

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The Innovation 2024年第5期5卷 21-22页

作者： chenyu li Danfeng Hong Bing Zhang Tianjun liao Naoto Yokoya Pedram Ghamisi Min Chen lizhe Wang Jon Atli Benediktsson Jocelyn Chanussot Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094China School of Electronic Electricaland Communication EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China Academy of Military Sciences Beijing 100000China Graduate School of Frontier Sciences The University of TokyoChiba 277-8561Japan Helmholtz-Zentrum Dresden-Rossendorf Helmholtz Institute Freiberg for Resource Technology09599 FreibergGermany Key Laboratory of Virtual Geographic Environment(Ministry of Education of PRC) Nanjing Normal UniversityNanjing 210023China School of Computer Science China University of GeosciencesWuhan 430078China Faculty of Electrical and Computer Engineering University of Iceland102 ReykjavikIceland University Grenoble Alpes InriaCNRSGrenoble INPLJK38000 GrenobleFrance

THE EARTH SYSTEM AMID THE BIG DATA *** processes of the Earth system drive interactions between energy,matter,and life,and a comprehensive understanding of their full evolutionary trajectory is critical for sustainable human *** modeling primarily relies on a set of theoretical equations to simulate dynamic process such as the carbon-nitrogen cycle,solar radiation dynamics,and terrestrial ecosystem dynamics.1 Despite the extensive modeling experience of Earth scientists,the rapid advancement of Earth observation techniques has led to a significant increase in the volume of databases,with data accumulating daily or even *** has exacerbated the conflict between the capacity for data collection and utilization for big Earth ***,there is an urgent need to enhance the intelligent processing and analysis of big Earth data.

关键词： dynamics. system foundation

Non-destructive detection of pigments in oil painting by using terahertz tomography

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Science China(Physics,Mechanics & Astronomy) 2015年第12期58卷 193-194页

作者： ZHANG ZhenWei WANG KeJia LEI Yong ZHANG ZhuoYong ZHANG ZhenWei WANG KeJia LEI Yong ZHANG ZhuoYong ZHAO YuanMeng li chenyu GU An SHI NingChang ZHAO Kun ZHAN HongLei ZHANG Cunlin Beijing Key Laboratory for Terahertz Spectroscopy and Imaging Key Laboratory of Terahertz Optoelectronics Ministry of Education Department of Physics Capital Normal University Beijing 100048 China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China The Department of Conservation Science and Technology the Palace Museum Beijing 100009 China Beijing Key Laboratory of Optical Detection Technology for Oil and Gas China University of Petroleum Beijing 102249 China Department of Chemistry Capital Normal University Beijing 100048 China

Dear Editors, Terahertz technology has been applied in many fields [1-3]. The protection and restoration of historical relics and cul- tural heritage, which is a new application area of terahertz technology, have been attracting much attention recently [4,5] because of its social significance and market prospects The most important premise is to obtain information of the cultural relics without damaging them again. Therefore the appropriate non-destructively testing methods are urgently needed in this area. Terahertz （THz） wave bridges the gap between microwave and infrared waves.

关键词：层析成像技术无损检测油画颜料太赫兹