A new horned toad species,Boulenophrys elongata sp.nov.,is described from Mt.Lianhua,Huidong County,eastern Guangdong,China.The new species is phylogenetically closest to B.brachykolos,which is restricted to the east ...A new horned toad species,Boulenophrys elongata sp.nov.,is described from Mt.Lianhua,Huidong County,eastern Guangdong,China.The new species is phylogenetically closest to B.brachykolos,which is restricted to the east of the Pearl River Estuary(i.e.,Shenzhen City and Hong Kong SAR).The new species can be distinguished from all recognized congeners by a combination of morphological characters and genetic divergences in the combined mitochondrial 16S,12S and CO1 genes.We recommend the new species be listed as Data Deficient(DD)in the IUCN categorization,pending further investigation.展开更多
Traditional medicinal animals and their derivatives hold a significant place within the traditional Chinese medicine framework.However,substantial knowledge about medicinal animals is being lost–particularly within C...Traditional medicinal animals and their derivatives hold a significant place within the traditional Chinese medicine framework.However,substantial knowledge about medicinal animals is being lost–particularly within China’s folk practices and ethnic minority groups–remains unrecorded and unverified scientifically.Such knowledge,primarily preserved through oral instruction,is now at risk of disappearing due to its fragmented and regionalized nature.This paper underscores the importance of documenting and scientifically validating these medicinal animals as valuable resources.We advocate for a comprehensive,systematic approach to recording,screening,and verifying the pharmacological mechanisms of medicinal animals.It can contribute to the modernization and globalization of traditional Chinese medicine.In the future,interdisciplinary and international collaborations are essential to advance the systematic documentation and scientific management of medicinal animal knowledge,to ensure its preservation and application in global healthcare,sustainable health practices,and biodiversity conservation efforts.展开更多
Partial nitrification is a key aspect of efficient nitrogen removal,although practically it suf-fers from long start-up cycles and unstable long-term operational performance.To address these drawbacks,this study inves...Partial nitrification is a key aspect of efficient nitrogen removal,although practically it suf-fers from long start-up cycles and unstable long-term operational performance.To address these drawbacks,this study investigated the effect of low intensity ultrasound treatment combined with hydroxylamine(NH2OH)on the performance of partial nitrification.Results showthat compared with the control group,low-intensity ultrasound treatment(0.10W/mL,15 min)combined with NH2OH(5 mg/L)reduced the time required for partial nitrification initiation by 6 days,increasing the nitrite accumulation rate(NAR)and ammonia nitro-gen removal rate(NRR)by 20.4% and 6.7%,respectively,achieving 96.48% NRR.Mechanis-tic analysis showed that NH2OH enhanced ammonia oxidation,inhibited nitrite-oxidizing bacteria(NOB)activity and shortened the time required for partial nitrification initiation.Furthermore,ultrasonication combined with NH2OH dosing stimulated EPS(extracellular polymeric substances)secretion,increased carbonyl,hydroxyl and amine functional group abundances and enhanced mass transfer.In addition,16S rRNA gene sequencing results showed that ultrasonication-sensitive Nitrospira disappeared from the ultrasound+NH_(2)OH system,while Nitrosomonas gradually became the dominant group.Collectively,the results of this study provide valuable insight into the enhancement of partial nitrification start-up during the process of wastewater nitrogen removal.展开更多
We present the continuously measurements of volatile organic compounds(VOCs)at a receptor site(Wan Qing Sha,WQS)in the Pearl River Delta(PRD)region from September to November of 2017.The average mixing ratios of total...We present the continuously measurements of volatile organic compounds(VOCs)at a receptor site(Wan Qing Sha,WQS)in the Pearl River Delta(PRD)region from September to November of 2017.The average mixing ratios of total VOCs(TVOCs)was 36.3±27.9 ppbv with the dominant contribution from alkanes(55.5%),followed by aromatics(33.3%).The diurnal variation of TVOCs showed a strong photochemical consumption during daytime,resulting in the formation of ozone(O_(3)).Five VOC sources were resolved by the positive matrix factorization(PMF)model,including solvent usage(28.6%),liquid petroleum gas(LPG)usage(24.4%),vehicle exhaust(21.0%),industrial emissions(13.2%)and gasoline evaporation(12.9%).The regional transport air masses from the upwind cities of south China can result in the elevated concentrations of TVOCs.Low ratios of TVOCs/NO_(x)(1.53±0.88)suggested that the O_(3) formation regime at WQS site was VOC-limited,which also confirmed by a photochemical box model with the master chemical mechanism(PBM-MCM).Furthermore,the observation on high-O_(3) episode days revealed that frequent O_(3) outbreaks at WQS were mainly caused by the regional transport of anthropogenic VOCs especially for aromatics and the subsequent photochemical reactions.This study provides valuable information for policymakers to propose the effective control strategies on photochemical pollution in a regional perspective.展开更多
With rapid economic development and urbanization in recent decades, China has experienced the worsening of ambient air quality. For better air quality management to protect human health, Chinese government revised nat...With rapid economic development and urbanization in recent decades, China has experienced the worsening of ambient air quality. For better air quality management to protect human health, Chinese government revised national ambient air quality standards （NAAQS） for particulate matter （PM） in 2012 （GB3095-2012）. To assess the effectiveness of current NAAQS for PM on public health in Chinese population, we conducted a meta- analysis on published studies examining the mortality risk of short-term exposure to PM with aerodynamic diameters less than 10 and 2.5μm （PM10 and PM2.5） in China. The reported 24-hour concentrations of PM10 and PM2.5 in studies ranged from 43.5 to 150.1 μg/m^3 and 37.5 to 176.7 μg/m^3. In the pooled excess, mortality risk estimates of short-term exposure to PM. In specific, per 10 μg/m^3 increase in PM10, we observed increases of 0.40% （95%CI： 0.33%, 0.47%）, 0.57% （95%CI： 0.44%, 0.70%） and 0.49% （95%CI： 0.40%, 0.58%） in total, respiratory and cardiovascular mortality, per 10/μg/m^3 increase in PM2.5, we observed increases of 0.51% （95% CI： 0.38%, 0.63%）, 0.62% （95%CI： 0.52%, 0.73%） and 0.75% （95%CI： 0.54%, 0.95%） in total, respiratory and cardiovascular mortality. Finally, we derived 125 μg/m^3 for PM10 and 62.5 μg/ m^3 for PM2.5 as 24-hour recommendation values based on the pooled estimates. Our results indicated that current Chinese NAAQS for PM could be sufficient in mitigating the excess mortality risk from short-term exposure to ambient PM. However, future research on long-term exposure cohort studies in Chinese population is also essential in revising annual averages for PM in Chinese NAAQS.展开更多
Because of the recent growth in ground-level ozone and increased emission of volatile organic compounds(VOCs),VOC emission control has become a major concern in China.In response,emission caps to control VOC have been...Because of the recent growth in ground-level ozone and increased emission of volatile organic compounds(VOCs),VOC emission control has become a major concern in China.In response,emission caps to control VOC have been stipulated in recent policies,but few of them were constrained by the co-control target of PM_(2.5)and ozone,and discussed the factor that influence the emission cap formulation.Herein,we proposed a framework for quantification of VOC emission caps constrained by targets for PM_(2.5)and ozone via a new response surface modeling(RSM)technique,achieving 50%computational cost savings of the quantification.In the Pearl River Delta(PRD)region,the VOC emission caps constrained by air quality targets varied greatly with the NOxemission reduction level.If control measures in the surrounding areas of the PRD region were not considered,there could be two feasible strategies for VOC emission caps to meet air quality targets(160μg/m^(3)for the maximum 8-hr-average 90th-percentile(MDA8-90%)ozone and 25μg/m^(3)for the annual average of PM_(2.5)):a moderate VOC emission cap with<20%NOxemission reductions or a notable VOC emission cap with>60%NOxemission reductions.If the ozone concentration target were reduced to 155μg/m^(3),deep NOxemission reductions is the only feasible ozone control measure in PRD.Optimization of seasonal VOC emission caps based on the Monte Carlo simulation could allow us to gain higher ozone benefits or greater VOC emission reductions.If VOC emissions were further reduced in autumn,MDA8-90%ozone could be lowered by 0.3-1.5μg/m^(3),equaling the ozone benefits of 10%VOC emission reduction measures.The method for VOC emission cap quantification and optimization proposed in this study could provide scientific guidance for coordinated control of regional PM_(2.5)and O_(3)pollution in China.展开更多
[Objective]To explore the differential gene expression profiles between skin cutaneous melanoma(SKCM)and normal tissues using bioinformatics methods,and to evaluate their predictive valuefor patient survival and progn...[Objective]To explore the differential gene expression profiles between skin cutaneous melanoma(SKCM)and normal tissues using bioinformatics methods,and to evaluate their predictive valuefor patient survival and prognosis.[Methods]Differentially expressed genes(DEGs)between tumor and normal tissues were identified using the GEPIA database.The correlation between keygene expression and overall survival was analyzed.[Results]A total of 6,457 significantly upregu-lated genes(FDR<0.05)were identified.The top 10 genes with the highest expression levels in-cluded PRAME,RP11-40C6.2,SERPINE2,SDC3,UBE2SP2,ETV5,PLOD3,EIF5AP4,UBE2S,and HNRNPCP2.Survival analysis revealed that the expression levels of EIF5AP4,UBE2S,andSERPINE2 were significantly associated with clinical prognosis.Specifically,high EIF5AP4 expression was significantly associated with shortened disease-free survival(DFS),while high UBE2Sexpression was significantly associated with reduced overall survival(OS)and DFS.In contrast,highSERPINE2 expression was significantly associated with prolonged OS and DFS.[Conclusion]Thisstudy suggests that UBE2S and EIF5AP4 may function as oncogenic factors promoting SKCM progression,whereas SERPINE2 may play a protective role.The combined expression of these threegenes may serve as a novel molecular signature for prognostic evaluation in SKCM.展开更多
[Objective]To explore the differential gene expression profiles between skin cutaneous melanoma(SKCM)and normal tissues using bioinformatics methods,and to evaluate their predictive value for patient survival and prog...[Objective]To explore the differential gene expression profiles between skin cutaneous melanoma(SKCM)and normal tissues using bioinformatics methods,and to evaluate their predictive value for patient survival and prognosis.[Methods]Differentially expressed genes(DEGs)between tumor and normal tissues were identified using the GEPIA database.The correlation between key gene expression and overall survival was analyzed.[Results]A total of 6,457 significantly upregulated genes(FDR<0.05)were identified.The top 10 genes with the highest expression levels included PRAME,RP11-40C6.2,SERPINE2,SDC3,UBE2SP2,ETV5,PLOD3,EIF5AP4,UBE2S,and HNRNPCP2.Survival analysis revealed that the expression levels of EIF5AP4,UBE2S,and SERPINE2 were significantly associated with clinical prognosis.Specifically,high EIF5AP4 expression was significantly associated with shortened disease-free survival(DFS),while high UBE2S expression was significantly associated with reduced overall survival(OS)and DFS.In contrast,high SERPINE2 expression was significantly associated with prolonged OS and DFS.[Conclusion]This study suggests that UBE2S and EIF5AP4 may function as oncogenic factors promoting SKCM progression,whereas SERPINE2 may play a protective role.The combined expression of these three genes may serve as a novel molecular signature for prognostic evaluation in SKCM.展开更多
With the goal of model fitting species abundance distribution patterns of the tree,shrub and herb layers of the natural Toona ciliata community in Xingdoushan Nature Reserve,Enshi Autonomous Prefecture,Hubei Province,...With the goal of model fitting species abundance distribution patterns of the tree,shrub and herb layers of the natural Toona ciliata community in Xingdoushan Nature Reserve,Enshi Autonomous Prefecture,Hubei Province,we used the data collected from the field survey and employed different ecological niche models.The models tested were the broken stick model(BSM),the overlapping niche model(ONM)and the niche preemption model(NPM),as well as three statistic models,the log-series distribution model(LSD),the log-normal distribution model(LND)and the Weibull distribution model(WDM).To determine the fitted model most suitable to each layer,the fitting effects were judged by criteria of the lowest value of Akaike Information Criterion(AIC),Chi-square and the K-S values with no significant difference(P>0.05)between the theoretical predictions and observed species abundance distribution values.The result showed:(1)The fitting suitability and goodness of fit of the tree,shrub and herb layers by using the three ecological niche models were ranked as:NPM>BSM>ONM.Of the three statistical models,by accepting the fitting results of the three layers,WDM was the best fitting model,followed by LND.By rejecting the fitting tests of the herb layer,LSD had the worst fitting effect.The goodness of the statistical models was ranked as:WDM>LND>LSD.In general,the statistical models had better fitting results than the ecological models.(2)T.ciliata was the dominant species of the tree layer.The species richness and diversity of the herb layer were much higher than those of either the tree layer or the shrub layer.The species richness and diversity of the shrub layer were slightly higher than those of the tree layer.The community evenness accorded to the following order:herb>shrub>tree.Considering the fitting results of the different layers,different ecological niche models or statistical models with optimal goodness of fit and ecological significance can be given priority to in studying the species abundance distribution patterns of T.ciliata communities.展开更多
基金supported by the Project of Background Survey of Biosafety in Guangdong Province(STST-2021-10)the Project of Study on Optimal Allocation and Sustainable Development of Typical Urban and Rural Ecological Resources(K610222062406).
文摘A new horned toad species,Boulenophrys elongata sp.nov.,is described from Mt.Lianhua,Huidong County,eastern Guangdong,China.The new species is phylogenetically closest to B.brachykolos,which is restricted to the east of the Pearl River Estuary(i.e.,Shenzhen City and Hong Kong SAR).The new species can be distinguished from all recognized congeners by a combination of morphological characters and genetic divergences in the combined mitochondrial 16S,12S and CO1 genes.We recommend the new species be listed as Data Deficient(DD)in the IUCN categorization,pending further investigation.
基金supported by the Project of Innovation team of General Institutes of Higher Education in Guangdong Province(2024KCXTD078)the Project of Integration of resource monitoring,epidemic diseases monitoring and rescue capability of wildlife in 2023(ZT202304111)the Special Project of the Lushan Botanical Garden(No.2024ZWZX06).
文摘Traditional medicinal animals and their derivatives hold a significant place within the traditional Chinese medicine framework.However,substantial knowledge about medicinal animals is being lost–particularly within China’s folk practices and ethnic minority groups–remains unrecorded and unverified scientifically.Such knowledge,primarily preserved through oral instruction,is now at risk of disappearing due to its fragmented and regionalized nature.This paper underscores the importance of documenting and scientifically validating these medicinal animals as valuable resources.We advocate for a comprehensive,systematic approach to recording,screening,and verifying the pharmacological mechanisms of medicinal animals.It can contribute to the modernization and globalization of traditional Chinese medicine.In the future,interdisciplinary and international collaborations are essential to advance the systematic documentation and scientific management of medicinal animal knowledge,to ensure its preservation and application in global healthcare,sustainable health practices,and biodiversity conservation efforts.
文摘Partial nitrification is a key aspect of efficient nitrogen removal,although practically it suf-fers from long start-up cycles and unstable long-term operational performance.To address these drawbacks,this study investigated the effect of low intensity ultrasound treatment combined with hydroxylamine(NH2OH)on the performance of partial nitrification.Results showthat compared with the control group,low-intensity ultrasound treatment(0.10W/mL,15 min)combined with NH2OH(5 mg/L)reduced the time required for partial nitrification initiation by 6 days,increasing the nitrite accumulation rate(NAR)and ammonia nitro-gen removal rate(NRR)by 20.4% and 6.7%,respectively,achieving 96.48% NRR.Mechanis-tic analysis showed that NH2OH enhanced ammonia oxidation,inhibited nitrite-oxidizing bacteria(NOB)activity and shortened the time required for partial nitrification initiation.Furthermore,ultrasonication combined with NH2OH dosing stimulated EPS(extracellular polymeric substances)secretion,increased carbonyl,hydroxyl and amine functional group abundances and enhanced mass transfer.In addition,16S rRNA gene sequencing results showed that ultrasonication-sensitive Nitrospira disappeared from the ultrasound+NH_(2)OH system,while Nitrosomonas gradually became the dominant group.Collectively,the results of this study provide valuable insight into the enhancement of partial nitrification start-up during the process of wastewater nitrogen removal.
基金supported by the National Key R&D Program of China(Nos.2017YFC0212802 and 2017YFC0212004)the support of MOST project(No.2017YFC0212001)for the collaboration。
文摘We present the continuously measurements of volatile organic compounds(VOCs)at a receptor site(Wan Qing Sha,WQS)in the Pearl River Delta(PRD)region from September to November of 2017.The average mixing ratios of total VOCs(TVOCs)was 36.3±27.9 ppbv with the dominant contribution from alkanes(55.5%),followed by aromatics(33.3%).The diurnal variation of TVOCs showed a strong photochemical consumption during daytime,resulting in the formation of ozone(O_(3)).Five VOC sources were resolved by the positive matrix factorization(PMF)model,including solvent usage(28.6%),liquid petroleum gas(LPG)usage(24.4%),vehicle exhaust(21.0%),industrial emissions(13.2%)and gasoline evaporation(12.9%).The regional transport air masses from the upwind cities of south China can result in the elevated concentrations of TVOCs.Low ratios of TVOCs/NO_(x)(1.53±0.88)suggested that the O_(3) formation regime at WQS site was VOC-limited,which also confirmed by a photochemical box model with the master chemical mechanism(PBM-MCM).Furthermore,the observation on high-O_(3) episode days revealed that frequent O_(3) outbreaks at WQS were mainly caused by the regional transport of anthropogenic VOCs especially for aromatics and the subsequent photochemical reactions.This study provides valuable information for policymakers to propose the effective control strategies on photochemical pollution in a regional perspective.
基金supported by the Beijing Natural Science Foundation (No. L150001)National Natural Science Foundation of China (No. 81773381)Ministry of Environmental Protection of the People's Republic of China Fund for National Environmental Criteria Management (No. 2110105)
文摘With rapid economic development and urbanization in recent decades, China has experienced the worsening of ambient air quality. For better air quality management to protect human health, Chinese government revised national ambient air quality standards （NAAQS） for particulate matter （PM） in 2012 （GB3095-2012）. To assess the effectiveness of current NAAQS for PM on public health in Chinese population, we conducted a meta- analysis on published studies examining the mortality risk of short-term exposure to PM with aerodynamic diameters less than 10 and 2.5μm （PM10 and PM2.5） in China. The reported 24-hour concentrations of PM10 and PM2.5 in studies ranged from 43.5 to 150.1 μg/m^3 and 37.5 to 176.7 μg/m^3. In the pooled excess, mortality risk estimates of short-term exposure to PM. In specific, per 10 μg/m^3 increase in PM10, we observed increases of 0.40% （95%CI： 0.33%, 0.47%）, 0.57% （95%CI： 0.44%, 0.70%） and 0.49% （95%CI： 0.40%, 0.58%） in total, respiratory and cardiovascular mortality, per 10/μg/m^3 increase in PM2.5, we observed increases of 0.51% （95% CI： 0.38%, 0.63%）, 0.62% （95%CI： 0.52%, 0.73%） and 0.75% （95%CI： 0.54%, 0.95%） in total, respiratory and cardiovascular mortality. Finally, we derived 125 μg/m^3 for PM10 and 62.5 μg/ m^3 for PM2.5 as 24-hour recommendation values based on the pooled estimates. Our results indicated that current Chinese NAAQS for PM could be sufficient in mitigating the excess mortality risk from short-term exposure to ambient PM. However, future research on long-term exposure cohort studies in Chinese population is also essential in revising annual averages for PM in Chinese NAAQS.
基金supported by the National Key Research and Development Program of China(No.2018YFC0213905)the National Natural Science Foundation of China(No.41805068)。
文摘Because of the recent growth in ground-level ozone and increased emission of volatile organic compounds(VOCs),VOC emission control has become a major concern in China.In response,emission caps to control VOC have been stipulated in recent policies,but few of them were constrained by the co-control target of PM_(2.5)and ozone,and discussed the factor that influence the emission cap formulation.Herein,we proposed a framework for quantification of VOC emission caps constrained by targets for PM_(2.5)and ozone via a new response surface modeling(RSM)technique,achieving 50%computational cost savings of the quantification.In the Pearl River Delta(PRD)region,the VOC emission caps constrained by air quality targets varied greatly with the NOxemission reduction level.If control measures in the surrounding areas of the PRD region were not considered,there could be two feasible strategies for VOC emission caps to meet air quality targets(160μg/m^(3)for the maximum 8-hr-average 90th-percentile(MDA8-90%)ozone and 25μg/m^(3)for the annual average of PM_(2.5)):a moderate VOC emission cap with<20%NOxemission reductions or a notable VOC emission cap with>60%NOxemission reductions.If the ozone concentration target were reduced to 155μg/m^(3),deep NOxemission reductions is the only feasible ozone control measure in PRD.Optimization of seasonal VOC emission caps based on the Monte Carlo simulation could allow us to gain higher ozone benefits or greater VOC emission reductions.If VOC emissions were further reduced in autumn,MDA8-90%ozone could be lowered by 0.3-1.5μg/m^(3),equaling the ozone benefits of 10%VOC emission reduction measures.The method for VOC emission cap quantification and optimization proposed in this study could provide scientific guidance for coordinated control of regional PM_(2.5)and O_(3)pollution in China.
文摘[Objective]To explore the differential gene expression profiles between skin cutaneous melanoma(SKCM)and normal tissues using bioinformatics methods,and to evaluate their predictive valuefor patient survival and prognosis.[Methods]Differentially expressed genes(DEGs)between tumor and normal tissues were identified using the GEPIA database.The correlation between keygene expression and overall survival was analyzed.[Results]A total of 6,457 significantly upregu-lated genes(FDR<0.05)were identified.The top 10 genes with the highest expression levels in-cluded PRAME,RP11-40C6.2,SERPINE2,SDC3,UBE2SP2,ETV5,PLOD3,EIF5AP4,UBE2S,and HNRNPCP2.Survival analysis revealed that the expression levels of EIF5AP4,UBE2S,andSERPINE2 were significantly associated with clinical prognosis.Specifically,high EIF5AP4 expression was significantly associated with shortened disease-free survival(DFS),while high UBE2Sexpression was significantly associated with reduced overall survival(OS)and DFS.In contrast,highSERPINE2 expression was significantly associated with prolonged OS and DFS.[Conclusion]Thisstudy suggests that UBE2S and EIF5AP4 may function as oncogenic factors promoting SKCM progression,whereas SERPINE2 may play a protective role.The combined expression of these threegenes may serve as a novel molecular signature for prognostic evaluation in SKCM.
文摘[Objective]To explore the differential gene expression profiles between skin cutaneous melanoma(SKCM)and normal tissues using bioinformatics methods,and to evaluate their predictive value for patient survival and prognosis.[Methods]Differentially expressed genes(DEGs)between tumor and normal tissues were identified using the GEPIA database.The correlation between key gene expression and overall survival was analyzed.[Results]A total of 6,457 significantly upregulated genes(FDR<0.05)were identified.The top 10 genes with the highest expression levels included PRAME,RP11-40C6.2,SERPINE2,SDC3,UBE2SP2,ETV5,PLOD3,EIF5AP4,UBE2S,and HNRNPCP2.Survival analysis revealed that the expression levels of EIF5AP4,UBE2S,and SERPINE2 were significantly associated with clinical prognosis.Specifically,high EIF5AP4 expression was significantly associated with shortened disease-free survival(DFS),while high UBE2S expression was significantly associated with reduced overall survival(OS)and DFS.In contrast,high SERPINE2 expression was significantly associated with prolonged OS and DFS.[Conclusion]This study suggests that UBE2S and EIF5AP4 may function as oncogenic factors promoting SKCM progression,whereas SERPINE2 may play a protective role.The combined expression of these three genes may serve as a novel molecular signature for prognostic evaluation in SKCM.
基金Public Welfare Research Project of Department of Science and Technology in Hubei Province(40 2012DBA40001)Scientific Research Project of Department of Education in Hubei Province(B20160555)
文摘With the goal of model fitting species abundance distribution patterns of the tree,shrub and herb layers of the natural Toona ciliata community in Xingdoushan Nature Reserve,Enshi Autonomous Prefecture,Hubei Province,we used the data collected from the field survey and employed different ecological niche models.The models tested were the broken stick model(BSM),the overlapping niche model(ONM)and the niche preemption model(NPM),as well as three statistic models,the log-series distribution model(LSD),the log-normal distribution model(LND)and the Weibull distribution model(WDM).To determine the fitted model most suitable to each layer,the fitting effects were judged by criteria of the lowest value of Akaike Information Criterion(AIC),Chi-square and the K-S values with no significant difference(P>0.05)between the theoretical predictions and observed species abundance distribution values.The result showed:(1)The fitting suitability and goodness of fit of the tree,shrub and herb layers by using the three ecological niche models were ranked as:NPM>BSM>ONM.Of the three statistical models,by accepting the fitting results of the three layers,WDM was the best fitting model,followed by LND.By rejecting the fitting tests of the herb layer,LSD had the worst fitting effect.The goodness of the statistical models was ranked as:WDM>LND>LSD.In general,the statistical models had better fitting results than the ecological models.(2)T.ciliata was the dominant species of the tree layer.The species richness and diversity of the herb layer were much higher than those of either the tree layer or the shrub layer.The species richness and diversity of the shrub layer were slightly higher than those of the tree layer.The community evenness accorded to the following order:herb>shrub>tree.Considering the fitting results of the different layers,different ecological niche models or statistical models with optimal goodness of fit and ecological significance can be given priority to in studying the species abundance distribution patterns of T.ciliata communities.
