Urban tree species provide various essential ecosystem services in cities,such as regulating urban temperatures,reducing noise,capturing carbon,and mitigating the urban heat island effect.The quality of these services...Urban tree species provide various essential ecosystem services in cities,such as regulating urban temperatures,reducing noise,capturing carbon,and mitigating the urban heat island effect.The quality of these services is influenced by species diversity,tree health,and the distribution and the composition of trees.Traditionally,data on urban trees has been collected through field surveys and manual interpretation of remote sensing images.In this study,we evaluated the effectiveness of multispectral airborne laser scanning(ALS)data in classifying 24 common urban roadside tree species in Espoo,Finland.Tree crown structure information,intensity features,and spectral data were used for classification.Eight different machine learning algorithms were tested,with the extra trees(ET)algorithm performing the best,achieving an overall accuracy of 71.7%using multispectral LiDAR data.This result highlights that integrating structural and spectral information within a single framework can improve the classification accuracy.Future research will focus on identifying the most important features for species classification and developing algorithms with greater efficiency and accuracy.展开更多
The East China Sea(ECS)off the Coast of Zhoushan Archipelago,Zhejiang(ECS-CZA)is home to abundant fishery resources and an important spawning,feeding,and nursing ground for a variety of fish species.Due to long-term o...The East China Sea(ECS)off the Coast of Zhoushan Archipelago,Zhejiang(ECS-CZA)is home to abundant fishery resources and an important spawning,feeding,and nursing ground for a variety of fish species.Due to long-term overfishing,the ichthyoplankton structure has been dramatically altered.Understanding the species composition and distribution of fish eggs and larvae is one of the most essential tasks to accurately regulate fishery resources and formulate effective management policies;however,little is known about the ichthyoplankton in this region.In this study,an integrated strategy of morphology identification(MI)and mitochondrial COI DNA barcoding was used to identify species of fish eggs and larvae collected from the ECSCZA.MI revealed 15 fish egg species belonging to 12 families and 12 fish larva species belonging to 12 families;in contrast,DNA barcoding altogether identified 30 species,including 18 fish egg species and 13 fish larva species.One species was shared between the egg and larva samples.Our study offers useful tools and critical scientific information for further understanding the diversity,distribution,and conservation management of various ichthyoplankton species in the marine environment.展开更多
NiFe2O4-based cermet inert anodes with metallic phase compositions of Cu, Ni and 85Cu15Ni were prepared by cold pressing-sintering. Their corrosion resistance was also investigated in Na3 AIF6-Al2O3 melts. The resuits...NiFe2O4-based cermet inert anodes with metallic phase compositions of Cu, Ni and 85Cu15Ni were prepared by cold pressing-sintering. Their corrosion resistance was also investigated in Na3 AIF6-Al2O3 melts. The resuits show that the metallic phase species in cermets have no effect on the concentration of impurities in bath during electrolysis, the total steady-state concentration of impurities is almost the same, i.e. between 4.12 × 10^-4- 4.80 × 10^-4. There exists metal preferential corrosion for the cermet inert anode with metal Ni as metallic phase. For NiFe2 O4-based cermets, the cermet with metal Cu as metallic phase exhibits better corrosion resistance than the others.展开更多
This paper summarized the classification of colorful tree species and the application principles on landscape architecture and briefly introduced the present application situation of colorful tree species in China. It...This paper summarized the classification of colorful tree species and the application principles on landscape architecture and briefly introduced the present application situation of colorful tree species in China. It also raised suggestions related to the introduction and application of the colorful tree species.展开更多
Interactions between the dissolved mineral species and other mineralsurface were investigated using solution chemistry calculation, -potential measurement, AES analysis and flotation tests. It has been indicated that ...Interactions between the dissolved mineral species and other mineralsurface were investigated using solution chemistry calculation, -potential measurement, AES analysis and flotation tests. It has been indicated that there canbe precipitation of scheelite over fluorite in scheelite supernatant at PH> 4.The conversion of fluorite into scheellte was detected by AES. Fluorite in the supernatant of scheelite exhibits nearly identical electrokinetic property andflotation behavior with those of scheelite. The selective flotatlon separation of fluorite from scheelite or vice vasa may be achieved by using selective amphoteric collector for fluorite at PH<4 to avoid surface conversion.展开更多
Three new genus and thirteen new specides published during 1988—1991 are de-scribed in this paper.They are:Fulgoridae——Neoalcathous huangshanana,N.wuyishanana,Kalidasa lui;Achilidae——Ganachilla zhenyuanensis,Haic...Three new genus and thirteen new specides published during 1988—1991 are de-scribed in this paper.They are:Fulgoridae——Neoalcathous huangshanana,N.wuyishanana,Kalidasa lui;Achilidae——Ganachilla zhenyuanensis,Haicixidia jianfegensis,Magadha yadon-gensis,M.gyirongensis,M.taibaishanensis,Catonidia tibetensis,C.guadunensis,C.wuyi-shanana,C.fujianensis;Cixiidae—Oliarus zaonensis.They all are collected from China.Thetype specimens of them are deposited in the Shijiazhuang Pomology Institute,Northwestern Agri-cultural University and Institute of Zoology,Academia Sinica.展开更多
Eighteen cultivars representing five botanical types of Arachis hypogaea L.were se-lected as female parents to cross with A.sp.9990,an Erectoides accession with resistance to mul-tiple diseases and pests.All the cross...Eighteen cultivars representing five botanical types of Arachis hypogaea L.were se-lected as female parents to cross with A.sp.9990,an Erectoides accession with resistance to mul-tiple diseases and pests.All the crosses failed to produce viable seeds mainly due to embryo abor-tions.Three morphologically different types of embryo abortion were recorded.Marked differ-ences were observed between subspecies,and among botanical types and genotypes in hybrid podproduction and embryo development.In terms of pod production per 100 pollinations,subspeciesfastigiata was superior to subspecies hypogaea,and Valencia and Virginia types performed betterthan Spanish and Peruvian types.Fengqiu Yibazhua and Silihong were among the most acceptablegenotypes by showing higher pod productions and delayed embryo abortions.These results sug-gest that through extensive screenings,particular genotypes with higher crossability or lessincompatibility with A.sp 9990 can be obtained,and the use of such genotypes in展开更多
This paper reviews the new developments in the choice of tree species for China’s plantation forestry in relation to forest regionalization and site classification. After a brief discussion on the fundamental princip...This paper reviews the new developments in the choice of tree species for China’s plantation forestry in relation to forest regionalization and site classification. After a brief discussion on the fundamental principles of choosing species,it gives the statistical data of the species composition of established forest plantations and recommendation for suitable tree species for plantations in some important forestry regions. Results of studies in 3 different cases have been given to illustrate the research approach in choice of tree species in accordance with the planting sites.展开更多
This paper deals with a new species of walking stick from Shanxi province. This new species is compared with related species of the genus Baculum. Figures of characteristics are provided.
Primary germplasm pools represent the mostreadily accessible source of new alleles for cropimprovement,but when the most effectivealleles are not available in the primarygermplasm pool,breeders must confront thediffic...Primary germplasm pools represent the mostreadily accessible source of new alleles for cropimprovement,but when the most effectivealleles are not available in the primarygermplasm pool,breeders must confront thedifficulties associated with introgression展开更多
Detection of specific nucleic acid sequences suchas RNA or DNA in chromosomes by in situhybridization has important applications in manyareas of biology.The genes encoding 18-26srRNA are located nucleus organizer regi...Detection of specific nucleic acid sequences suchas RNA or DNA in chromosomes by in situhybridization has important applications in manyareas of biology.The genes encoding 18-26srRNA are located nucleus organizer regions(NORs)in plant chromosomes.Fluorescent insitu hybridization(FISH)with 18-26s rDNA展开更多
A new species of Hartmaniellidae was found in the comprehensive survey of Taiwan Strait of China duing April 1984 to February 1985. The new species is named as Hartmaniella fujianensis. Eight specimens of the species ...A new species of Hartmaniellidae was found in the comprehensive survey of Taiwan Strait of China duing April 1984 to February 1985. The new species is named as Hartmaniella fujianensis. Eight specimens of the species were taken from depths of 5 to 74m. They are deposited in the Third Institute of Oceanography, State Oceanic Administration, Xiamen. Descriptions of the new species are given as below.展开更多
A simple and sensitive high performance liquid chromatography-chemical vapour generation-atom fluorescent spectrometry （HPLC-CVG-AFS） method was developed and validated for simultaneous determination mercury species...A simple and sensitive high performance liquid chromatography-chemical vapour generation-atom fluorescent spectrometry （HPLC-CVG-AFS） method was developed and validated for simultaneous determination mercury species in Su-He-Xiang-Wan （SHXW） and in tissues of rats, respectively. The species of mercury were separated by a Venusil MP-C 18 （5μm, 150 mm×4.6 ram） column with the optimized mobile phase containing 5% （w/v） acetonitrile, 0.01 mol/L L-cysteine and 0.06 moL/L ammonium acetate. The tissues of rats were freeze-dried after giving the medicine for 10 d, and then added into the solution containing 10% （w/v） HC1, 1% （w/v） sulfocarbamide and 0.15% （w/v） KC1 for increasing extraction rate. The resolutions of Hg2＋, MeHg and EtHg were 1.5 and 2.9, respectively. The detection limits of Hg2＋, MeHg and EtHg were 2.0, 1.0 and 0.9 ng/mL, respectively. The relative standard deviation （RSD） of inter- and intra-day precisions ranged from 1.56% to 2.86%. The recovery rates of three different adding level were 87%-101% （n=6）, and the RSDs were smaller than 8.2%. The results show that no MeHg and EtHg were detected in rat tissues. Only soluble mercury （Hg2＋） was determined for the mercury species of SHXW in rat tissues.展开更多
The species composition and succession discipline after eruption of volcanoes in Wudalianchi Nature Reserve, China, including new volcanoes, such as Huoshao and Laohei Mountains, and old volcanoes, such as East Jiaode...The species composition and succession discipline after eruption of volcanoes in Wudalianchi Nature Reserve, China, including new volcanoes, such as Huoshao and Laohei Mountains, and old volcanoes, such as East Jiaodebu, Wohu and North Gelaqiu Mountains, in different historical periods were investigated by adopting the concept of space as a substitute for time. The species composition, community characteristics and diversity analysis in the remains of volcanic lava flow at various stages were analyzed. The results showed that 192 types of vascular plants that belonged to 50 families and 126 genera in the survey areas existed in the restoration process of primary succession. At the same time, the agglomeration process of plant community succession and the diversity of dominant community were investigated, and the changes in plant diversity at different succession stages were calculated using Margalef, Simpson, Shannon–Wiener, Pielou, Jaccard and Cody indices.展开更多
Fluorescent in situ hybridization(FISH) is an important technique in plant genome research,because it provides integrated information about DNA,chromosomes and genomes.Genomic in situ hybridization(GISH) is a modifica...Fluorescent in situ hybridization(FISH) is an important technique in plant genome research,because it provides integrated information about DNA,chromosomes and genomes.Genomic in situ hybridization(GISH) is a modification of FISH that can be used to rapidly compare genome content,relatedness,organization and/or behavior.GISH results often provide insight into genome evolution and species relationships.The cotton genus Gossypium consists of about 50 species,including 5展开更多
In the paper,we study an optimal control for a system representing a competitive species model with fertility and mortality depending on a weighted size in a polluted environment.A fixed point theorem is applied to ob...In the paper,we study an optimal control for a system representing a competitive species model with fertility and mortality depending on a weighted size in a polluted environment.A fixed point theorem is applied to obtain the existence and uniqueness exhibited by a non-negative solution of above mentioned model.A maximum principle helps to carefully verify the existence of the optimal control policy,and tangent-normal cone techniques help to obtain the optimal condition specific to control issue.展开更多
文摘Urban tree species provide various essential ecosystem services in cities,such as regulating urban temperatures,reducing noise,capturing carbon,and mitigating the urban heat island effect.The quality of these services is influenced by species diversity,tree health,and the distribution and the composition of trees.Traditionally,data on urban trees has been collected through field surveys and manual interpretation of remote sensing images.In this study,we evaluated the effectiveness of multispectral airborne laser scanning(ALS)data in classifying 24 common urban roadside tree species in Espoo,Finland.Tree crown structure information,intensity features,and spectral data were used for classification.Eight different machine learning algorithms were tested,with the extra trees(ET)algorithm performing the best,achieving an overall accuracy of 71.7%using multispectral LiDAR data.This result highlights that integrating structural and spectral information within a single framework can improve the classification accuracy.Future research will focus on identifying the most important features for species classification and developing algorithms with greater efficiency and accuracy.
文摘The East China Sea(ECS)off the Coast of Zhoushan Archipelago,Zhejiang(ECS-CZA)is home to abundant fishery resources and an important spawning,feeding,and nursing ground for a variety of fish species.Due to long-term overfishing,the ichthyoplankton structure has been dramatically altered.Understanding the species composition and distribution of fish eggs and larvae is one of the most essential tasks to accurately regulate fishery resources and formulate effective management policies;however,little is known about the ichthyoplankton in this region.In this study,an integrated strategy of morphology identification(MI)and mitochondrial COI DNA barcoding was used to identify species of fish eggs and larvae collected from the ECSCZA.MI revealed 15 fish egg species belonging to 12 families and 12 fish larva species belonging to 12 families;in contrast,DNA barcoding altogether identified 30 species,including 18 fish egg species and 13 fish larva species.One species was shared between the egg and larva samples.Our study offers useful tools and critical scientific information for further understanding the diversity,distribution,and conservation management of various ichthyoplankton species in the marine environment.
基金Project(2005CB623703) supported by the National Basic Research Programof China project(03JJY3080) supported bythe Hunan Provincial Natural Science Foundation
文摘NiFe2O4-based cermet inert anodes with metallic phase compositions of Cu, Ni and 85Cu15Ni were prepared by cold pressing-sintering. Their corrosion resistance was also investigated in Na3 AIF6-Al2O3 melts. The resuits show that the metallic phase species in cermets have no effect on the concentration of impurities in bath during electrolysis, the total steady-state concentration of impurities is almost the same, i.e. between 4.12 × 10^-4- 4.80 × 10^-4. There exists metal preferential corrosion for the cermet inert anode with metal Ni as metallic phase. For NiFe2 O4-based cermets, the cermet with metal Cu as metallic phase exhibits better corrosion resistance than the others.
文摘This paper summarized the classification of colorful tree species and the application principles on landscape architecture and briefly introduced the present application situation of colorful tree species in China. It also raised suggestions related to the introduction and application of the colorful tree species.
文摘Interactions between the dissolved mineral species and other mineralsurface were investigated using solution chemistry calculation, -potential measurement, AES analysis and flotation tests. It has been indicated that there canbe precipitation of scheelite over fluorite in scheelite supernatant at PH> 4.The conversion of fluorite into scheellte was detected by AES. Fluorite in the supernatant of scheelite exhibits nearly identical electrokinetic property andflotation behavior with those of scheelite. The selective flotatlon separation of fluorite from scheelite or vice vasa may be achieved by using selective amphoteric collector for fluorite at PH<4 to avoid surface conversion.
文摘Three new genus and thirteen new specides published during 1988—1991 are de-scribed in this paper.They are:Fulgoridae——Neoalcathous huangshanana,N.wuyishanana,Kalidasa lui;Achilidae——Ganachilla zhenyuanensis,Haicixidia jianfegensis,Magadha yadon-gensis,M.gyirongensis,M.taibaishanensis,Catonidia tibetensis,C.guadunensis,C.wuyi-shanana,C.fujianensis;Cixiidae—Oliarus zaonensis.They all are collected from China.Thetype specimens of them are deposited in the Shijiazhuang Pomology Institute,Northwestern Agri-cultural University and Institute of Zoology,Academia Sinica.
文摘Eighteen cultivars representing five botanical types of Arachis hypogaea L.were se-lected as female parents to cross with A.sp.9990,an Erectoides accession with resistance to mul-tiple diseases and pests.All the crosses failed to produce viable seeds mainly due to embryo abor-tions.Three morphologically different types of embryo abortion were recorded.Marked differ-ences were observed between subspecies,and among botanical types and genotypes in hybrid podproduction and embryo development.In terms of pod production per 100 pollinations,subspeciesfastigiata was superior to subspecies hypogaea,and Valencia and Virginia types performed betterthan Spanish and Peruvian types.Fengqiu Yibazhua and Silihong were among the most acceptablegenotypes by showing higher pod productions and delayed embryo abortions.These results sug-gest that through extensive screenings,particular genotypes with higher crossability or lessincompatibility with A.sp 9990 can be obtained,and the use of such genotypes in
文摘This paper reviews the new developments in the choice of tree species for China’s plantation forestry in relation to forest regionalization and site classification. After a brief discussion on the fundamental principles of choosing species,it gives the statistical data of the species composition of established forest plantations and recommendation for suitable tree species for plantations in some important forestry regions. Results of studies in 3 different cases have been given to illustrate the research approach in choice of tree species in accordance with the planting sites.
基金This research was supported by the National Natural Science Foundation of China
文摘This paper deals with a new species of walking stick from Shanxi province. This new species is compared with related species of the genus Baculum. Figures of characteristics are provided.
文摘Primary germplasm pools represent the mostreadily accessible source of new alleles for cropimprovement,but when the most effectivealleles are not available in the primarygermplasm pool,breeders must confront thedifficulties associated with introgression
文摘Detection of specific nucleic acid sequences suchas RNA or DNA in chromosomes by in situhybridization has important applications in manyareas of biology.The genes encoding 18-26srRNA are located nucleus organizer regions(NORs)in plant chromosomes.Fluorescent insitu hybridization(FISH)with 18-26s rDNA
文摘A new species of Hartmaniellidae was found in the comprehensive survey of Taiwan Strait of China duing April 1984 to February 1985. The new species is named as Hartmaniella fujianensis. Eight specimens of the species were taken from depths of 5 to 74m. They are deposited in the Third Institute of Oceanography, State Oceanic Administration, Xiamen. Descriptions of the new species are given as below.
基金Projects(20875104, 21075138) supported by the National Natural Science Foundation of China
文摘A simple and sensitive high performance liquid chromatography-chemical vapour generation-atom fluorescent spectrometry （HPLC-CVG-AFS） method was developed and validated for simultaneous determination mercury species in Su-He-Xiang-Wan （SHXW） and in tissues of rats, respectively. The species of mercury were separated by a Venusil MP-C 18 （5μm, 150 mm×4.6 ram） column with the optimized mobile phase containing 5% （w/v） acetonitrile, 0.01 mol/L L-cysteine and 0.06 moL/L ammonium acetate. The tissues of rats were freeze-dried after giving the medicine for 10 d, and then added into the solution containing 10% （w/v） HC1, 1% （w/v） sulfocarbamide and 0.15% （w/v） KC1 for increasing extraction rate. The resolutions of Hg2＋, MeHg and EtHg were 1.5 and 2.9, respectively. The detection limits of Hg2＋, MeHg and EtHg were 2.0, 1.0 and 0.9 ng/mL, respectively. The relative standard deviation （RSD） of inter- and intra-day precisions ranged from 1.56% to 2.86%. The recovery rates of three different adding level were 87%-101% （n=6）, and the RSDs were smaller than 8.2%. The results show that no MeHg and EtHg were detected in rat tissues. Only soluble mercury （Hg2＋） was determined for the mercury species of SHXW in rat tissues.
基金Supported by Guidance of HAS(STXB-02)the Basic Financial Foundation of Heilongjiang Province(STJB16-02)
文摘The species composition and succession discipline after eruption of volcanoes in Wudalianchi Nature Reserve, China, including new volcanoes, such as Huoshao and Laohei Mountains, and old volcanoes, such as East Jiaodebu, Wohu and North Gelaqiu Mountains, in different historical periods were investigated by adopting the concept of space as a substitute for time. The species composition, community characteristics and diversity analysis in the remains of volcanic lava flow at various stages were analyzed. The results showed that 192 types of vascular plants that belonged to 50 families and 126 genera in the survey areas existed in the restoration process of primary succession. At the same time, the agglomeration process of plant community succession and the diversity of dominant community were investigated, and the changes in plant diversity at different succession stages were calculated using Margalef, Simpson, Shannon–Wiener, Pielou, Jaccard and Cody indices.
文摘Fluorescent in situ hybridization(FISH) is an important technique in plant genome research,because it provides integrated information about DNA,chromosomes and genomes.Genomic in situ hybridization(GISH) is a modification of FISH that can be used to rapidly compare genome content,relatedness,organization and/or behavior.GISH results often provide insight into genome evolution and species relationships.The cotton genus Gossypium consists of about 50 species,including 5
基金Supported by the Natural Science Foundation of Ningxia(2023AAC03114)National Natural Science Foundation of China(72464026).
文摘In the paper,we study an optimal control for a system representing a competitive species model with fertility and mortality depending on a weighted size in a polluted environment.A fixed point theorem is applied to obtain the existence and uniqueness exhibited by a non-negative solution of above mentioned model.A maximum principle helps to carefully verify the existence of the optimal control policy,and tangent-normal cone techniques help to obtain the optimal condition specific to control issue.
