A Physics-informed Deep-learning Intensity Prediction Scheme for Tropical Cyclones over the Western North Pacific

Accurate prediction of tropical cyclone(TC)intensity is challenging due to the complex physical processes involved.Here,we introduce a new TC intensity prediction scheme for the western North Pacific(WNP)based on a time-dependent theory of TC intensification,termed the energetically based dynamical system(EBDS)model,together with the use of a long short-term memory(LSTM)neural network.In time-dependent theory,TC intensity change is controlled by both the internal dynamics of the TC system and various environmental factors,expressed as environmental dynamical efficiency.The LSTM neural network is used to predict the environmental dynamical efficiency in the EBDS model trained using besttrack TC data and global reanalysis data during 1982–2017.The transfer learning and ensemble methods are used to retrain the scheme using the environmental factors predicted by the Global Forecast System(GFS)of the National Centers for Environmental Prediction during 2017–21.The predicted environmental dynamical efficiency is finally iterated into the EBDS equations to predict TC intensity.The new scheme is evaluated for TC intensity prediction using both reanalysis data and the GFS prediction data.The intensity prediction by the new scheme shows better skill than the official prediction from the China Meteorological Administration(CMA)and those by other state-of-art statistical and dynamical forecast systems,except for the 72-h forecast.Particularly at the longer lead times of 96 h and 120 h,the new scheme has smaller forecast errors,with a more than 30%improvement over the official forecasts.

Track-Pattern-Based Characteristics of Extratropical Transitioning Tropical Cyclones in the Western North Pacific

Based on the Regional Specialized Meteorological Center(RSMC)Tokyo-Typhoon Center best-track data and the NCEP-NCAR reanalysis dataset,extratropical transitioning(ET)tropical cyclones(ETCs)over the western North Pacific(WNP)during 1951–2021 are classified into six clusters using the fuzzy c-means clustering method(FCM)according to their track patterns.The characteristics of the six hard-clustered ETCs with the highest membership coefficient are shown.Most tropical cyclones(TCs)that were assigned to clusters C2,C5,and C6 made landfall over eastern Asian countries,which severely threatened these regions.Among landfalling TCs,93.2%completed their ET after landfall,whereas 39.8%of ETCs completed their transition within one day.The frequency of ETCs over the WNP has decreased in the past four decades,wherein cluster C5 demonstrated a significant decrease on both interannual and interdecadal timescales with the expansion and intensification of the western Pacific subtropical high(WPSH).This large-scale circulation pattern is favorable for C2 and causes it to become the dominant track pattern,owning to it containing the largest number of intensifying ETCs among the six clusters,a number that has increased insignificantly over the past four decades.The surface roughness variation and three-dimensional background circulation led to C5 containing the maximum number of landfalling TCs and a minimum number of intensifying ETCs.Our results will facilitate a better understanding of the spatiotemporal distributions of ET events and associated environment background fields,which will benefit the effective monitoring of these events over the WNP.

Environmental Conditions Conducive to the Formation of Multiple Tropical Cyclones over the Western North Pacific

There is limited understanding regarding the formation of multiple tropical cyclones(MTCs).This study explores the environmental conditions conducive to MTC formation by objectively determining the atmospheric circulation patterns favorable for MTC formation over the western North Pacific.Based on 199 MTC events occurring from June to October 1980–2020,four distinct circulation patterns are identified:the monsoon trough(MT)pattern,accounting for 40.3%of occurrences,the confluence zone(CON)pattern at 26.2%,the easterly wave(EW)pattern at 17.8%,and the monsoon gyre(MG)pattern at 15.7%.The MT pattern mainly arises from the interaction between the subtropical high and the monsoon trough,with MTCs forming along the monsoon trough and its flanks.The CON pattern is affected by the subtropical high,the South Asian high,and the monsoon trough,with MTCs emerging at the confluence zone where the prevailing southwesterly and southeasterly flows converge.The EW pattern is dominated by easterly flows,with MTCs developing along the easterly wave train.MTCs in the MG pattern arise within a monsoon vortex characterized by strong southwesterly flows.A quantitative analysis further indicates that MTC formation in the MT pattern is primarily governed by mid-level vertical velocity and low-level vorticity,while mid-level humidity and vertical velocity are significantly important in the other patterns.The meridional shear and convergence of zonal winds are essential in converting barotropic energy from the basic flows to disturbance kinetic energy,acting as the primary source for eddy kinetic energy growth.

The possibility analysis of habitats,origin and reappearance of bloom green alga(Enteromorpha prolifera) on inshore of western Yellow Sea

Combining some information from field investigation of algae along the coastal areas in China and a few pictures materialized from the western Yellow Sea in 2008,authors analyze the necessary conditions and possible water area in China producing a large biomass,some reasons for firestorm,and the possibility of the reappearance of marine bloom green alga Enteromorpha prolifera.The change of habitats and the increase of nutritional levels related to the water area could be considered as direct reasons.It was transferred northward by the combination of the flow of rainwater,wind and alongshore marine current.The original region of large biomass produced is possibly located in the southwestern Yellow sea.It will possibly be appearing again in the coming years or in the future.A summary is also given referring to its reproduction,development and distribution worldwide.

Origin and evolution of oilfield brines from Tertiary strata in western Qaidam Basin:Constraints from ^(87)Sr/^(86)Sr,δD,δ^(18)O,δ^(34)S and water chemistry

Chemistry of major and minor elements,87Sr/86Sr,δD,δ18O and δ34S of brines were measured from Tertiary strata and Quaternary salt lakes in the western Qaidam Basin.The water chemistry data show that all oilfield brines are CaCl2 type.They were enriched in Ca2+,B3+,Li+,Sr2+,Br-,and were depleted in Mg2+,SO42-,which indicated that these brines had the characteristics of deeply circulated water.The relationship between δD and δ18O shows that all data of these brines decline towards the Global Meteoric Water Line(GWL) and Qaidam Meteoric Water Line(QWL),and that the intersection between oilfield brines and Meteoric Water Lines was close to the local spring and fresh water in the piedmont in the western Qaidam Basin.The results suggest that oilfield brines has initially originated from meteoric water,and then might be affected by water-rock metamorphose,because most oilfield brines distribute in the range of metamorphosing water.The 87Sr/86Sr values of most oilfield brines range from 0.71121 to 0.71194,and was less than that in salt lake water(>0.712),but close to that of halite in the study area.These imply that salt dissolution occurred in the process of migration.In addition,all oilfield brines have obviously much positive δ34S values(ranging from 26.46‰ to 54.57‰) than that of salt lake brines,which was caused by bacterial sulfate reduction resulting in positive shift of δ34S value and depleteed SO42-in oilfield brines.Combined with water chemical data and δD,δ18O,87Sr/86Sr,δ34S values,we concluded that oilfield brines mainly originate from the deeply circulated meteoric waters,and then are affected by salt dissolution,water-rock metamorphose,sulfate reduction and dolomitization during the process of migration.These processes alter the chemical compositions of oilfield brines and accumulate rich elements(such as B,Li,Sr,Br,K and so on) for sustainable utilization of salt lake resources in the Qaidam Basin.

Risk factors for peripheral arterial disease in the tropics and its comparison with the western population

Objective:To identify and compare the existence of similar and other risk factors in the perspective of an Indian population.Methods:It was designed as a case control study and was conducted in the Department of General and Vascular Surgery Unit 2 of Christian Medical College,Vellore,India between the periods July 2003 to June 2005.100 patients with an ABPI【 0.9 and 100 controls were studied.Results:Peripheral arterial disease(PAD) was found to be commoner among males(87%).While atherosclerosis was the commonest aetiology(54%),the incidence of Thromboangiitis Obliterans was also not uncommon(38%).Smoking was the main risk factor in the Indian context(83%) as compared to hypercholesterolemia(60%) in the West. The patients with atherosclerotic PAD were middle-aged and had concomitant diabetes(50%) and hypertension(30%).Conclusions:Peripheral arterial disease occurs in a relatively younger age group in India as compared to their Western counterparts.Thromboangiitis Obliterans was found to be a significant aetiology for arterial occlusive disease,with smoking as the primary risk factor followed by diabetes,hypertension and hypercholesterolemia.

Characteristics and Natural Gas Origin of Middle-Late Triassic Marine Source Rocks of the Western Sichuan Depression, SW China

A scientific exploration well(CK1) was drilled to expand the oil/gas production in the western Sichuan depression, SW, China. Seventy-three core samples and four natural gas samples from the Middle–Late Triassic strata were analyzed to determine the paleo-depositional setting and the abundance of organic matter(OM) and to evaluate the hydrocarbon-generation process and potential. This information was then used to identify the origin of the natural gas. The OM is characterized by medium n-alkanes(n C15–n C19), low pristane/phytane and terrigenous aquatic ratios(TAR), a carbon preference index(CPI) of ~1, regular steranes with C29 > C27 > C28, gammacerane/C30 hopane ratios of 0.15–0.32, and δDorg of-132‰ to-58‰, suggesting a marine algal/phytoplankton source with terrestrial input deposited in a reducing–transitional saline/marine sedimentary environment. Based on the TOC, HI index, and chloroform bitumen "A" the algalrich dolomites of the Leikoupo Formation are fair–good source rocks;the grey limestones of the Maantang Formation are fair source rocks;and the shales of the Xiaotangzi Formation are moderately good source rocks. In addition, maceral and carbon isotopes indicate that the kerogen of the Leikoupo and Maantang formations is type Ⅱ and that of the Xiaotangzi Formation is type Ⅱ–Ⅲ. The maturity parameters and the hopane and sterane isomerization suggest that the OM was advanced mature and produced wet–dry gases. One-dimensional modeling of the thermal-burial history suggests that hydrocarbon-generation occurred at 220–60 Ma. The gas components and C–H–He–Ar–Ne isotopes indicate that the oilassociated gases were generated in the Leikoupo and Maantang formations, and then, they mixed with gases from the Xiaotangzi Formation, which were probably contributed by the underlying Permian marine source rocks. Therefore, the deeply-buried Middle–Late Triassic marine source rocks in the western Sichuan depression and in similar basins have a great significant hydrocarbon potential.

Ocean-continent Transition to Suprasubduction Zone Origin of the Western Yarlung Zangbo Ophiolites in SW Tibet, China: Multi-stage, Transient Evolution of the Neotethyan Oceanic Lithosphere

The ophiolites that crop out discontinuously along the;000 km Yarlung Zangbo Suture zone（YZSZ）between the Nanga Parbat and Namche Barwa syntaxes in southern Tibet represent the remnants of Neotethyan oceanic lithosphere（Fig.1a）.We have investigated the internal structure and the geochemical makeup of mafic-ultramafic rock assemblages that are exposed in the westernmost segment of the YZSZ where the suture zone architecture displays two distinct sub-belts of ophiolitic and mélange units separated by a continental Zhongba terrane（Fig.1b）.These two sub-belts include the Daba–Xiugugabu in the south（Southern sub-belt,SSB）and the Dajiweng–Saga in the north（Northern sub-belt,NSB）.We present new structural,geochemical,geochronological data from upper mantle peridotites and mafic dike intrusions occurring in these two sub-belts and discuss their tectonomagmatic origin.In-situ analysis of zircon grains obtained from mafic dikes within the Baer,Cuobuzha and Jianabeng massifs in the NSB,and within the Dongbo,Purang,Xiugugabu,Zhaga and Zhongba in the SSB have yielded crystallization ages ranging between130 and 122 Ma.Dike rocks in both sub-belts show N-MORB REE patterns and negative Nb,Ta and Ti anomalies,reminiscent of those documented from SSZ ophiolites.*Harzburgitic host rocks of the mafic dike intrusionsmainly display geochemical compositions of abyssal peridotites（Fig.2）,with the exception of the Dajiweng harzburgites,which show the geochemical signatures of forearc peridotites（Lian et al.,2016）.Extrusive rocks that are spatially associated with these peridotite massifs in both sub-belts also have varying compositional and geochemical features.Tithonian to Valanginian（150–135 Ma）basaltic rocks in the Dongbo massif have OIB-like geochemistry and 138 Ma basaltic lavas in the Purang massif have EMORB-like geochemistry（Liu et al.,2015）.Tuffaceous rocks in the Dajiweng massif are140 Ma in age and show OIB-like geochemistry.We interpret these age and geochemical data to reflect a rifted continental margin origin of the extrusive rock units in both sub-belts.These data and structural observations show that the western Yarluang Zangbo ophiolites represent fragments of an Ocean-Continent Transition（OCT）peridotites altered by fluids in an initial supersubduction setting.We infer that mafic-ultramafic rock assemblages exposed in the SSB and NSB initially formed in an ocean–continent transition zone（OCTZ）during the late Jurassic,and that they were subsequently emplaced in the forearc setting of an intraoceanic subduction zone within a Neotethyan seaway during 130 to 122 Ma.The NSB and SSB are hence part of a single,S-directed nappe sheet derived from a Neotethyan seaway located north of the Zhongba terrane.

Study on security and protection of original ecotourism resources in the mountain areas of western Guangxi

Original ecotourism resources mainly refer to natural and human original ecotourism resources, and it＇s of fragility, rarity and irreversibility. As a valuable historic heritage and hnportant tourism resources, it plays a significant role in developing tourism and economy in such areas as the underdeveloped areas, the mountain areas and mimority areas. The tourism resources in the western mountain areas of Guangxi owe ,superiorities and characteristics ＇o their original ecology, Yet, western Guangxi is an ethnic region with fragile karst eco-environment, so it is specialto exploit the tourism resources. The paper defines original eeotourism and analyses the specialties and advantages of the original ecotourism resources as well as thefrailty of the ecotourism resources of the region. The ways of thinking are put forward for safe preservation and sustainable development of the original ecotourism resources, i.e. carrying out measures for the multi-grade protection of heritage resources, setting up a ethnic eco-museum/ ethnic culture eco-park and a gene pool of ethnic cultures, etc.

Interdecadal Enhancement in the Relationship between the Western North Pacific Summer Monsoon and Sea Surface Temperature in the Tropical Central-Western Pacific after the Early 1990s

This study reveals the strengthened interdecadal relationship between the western North Pacific summer monsoon(WNPSM)and tropical central-western Pacific sea surface temperature anomaly(SSTA)in summer after the early 1990s.In the first period(1979–91,P1),the WNPSM-related precipitation anomaly and horizontal wind anomaly present themselves as an analogous Pacific-Japan(PJ)-like pattern,generally considered to be related to the Niño-3 index in the preceding winter.During the subsequent period(1994–2019,P2),the WNPSM-related precipitation anomaly presents a zonal dipole pattern,correlated significantly with the concurrent SSTA in the Niño-4 and tropical western Pacific regions.The negative(positive)SSTA in the tropical western Pacific and positive(negative)SSTA in the Niño-4 region,could work together to influence the WNPSM,noting that the two types of anomalous SSTA configurations enhance(weaken)the WNPSM by the positive(negative)phase PJ-like wave and Gill response,respectively,with an anomalous cyclone(anticyclone)located in the WNPSM,which shows obvious symmetry about the anomalous circulation.Specifically,the SSTA in Niño-4 impacts the WNPSM by an atmospheric Gill response,with a stronger(weaker)WNPSM along with a positive(negative)SSTA in the Niño-4 region.Furthermore,the SSTA in the tropical western Pacific exerts an influence on the WNPSM by a PJ-like wave,with a stronger(weaker)WNPSM along with a negative(positive)SSTA in the tropical western Pacific.In general,SSTAs in the tropical western Pacific and Niño-4 areas could work together to exert influence on the WNPSM,with the effect most likely to occur in the El Niño(La Niña)developing year in P2.However,the SSTAs in the tropical western Pacific worked alone to exert an influence on the WNPSM mainly in 2013,2014,2016,and 2017,and the SSTAs in the Niño-4 region worked alone to exert an influence on the WNPSM mainly in Central Pacific(CP)La Niña developing years.The sensitivity experiments also can reproduce the PJ-like wave/Gill response associated with SSTA in the tropical western Pacific/Niño-4 regions.Therefore,the respective and synergistic impacts from the Niño-4 region and the tropical western Pacific on the WNPSM have been revealed,which helps us to acquire a better understanding of the interdecadal variations of the WNPSM and its associated climate influences.

Influence of the pace of El Nino decay on tropical cyclone frequency over the western north pacific during decaying El Nino summers

本文分析了El Nino事件衰减速度的差异对衰退年夏季西北太平洋热带气旋(tropical cyclone,TC)频数的不同影响。按照ElNiio事件衰减速度不同,将其划分为迅速衰减(rapid decaying,RD)和缓慢衰减(slowdecaying,SD)的El Nino事件.SD(RD)El Nino事件的衰退年夏季,赤道中东太平洋海温仍维持正异常(衰减为负异常).与SD El Nino事件相比,RDElNino事件衰退年夏季西北太平洋TC频数显著减少.进一步的分析揭示了导致TC频数差异的大尺度环境要素,指出热带印度洋-太平洋海温异常密切相关的西北太平洋低层反气旋异常在其中起到了关键作用。

“文明起源”史观之意味:“中西马”视角的考察

“文明起源”作为国内学界使用频率极高的舶来语,主要用以说明距今五千多年至“三代”时期历史文化的发展。但是否合适的问题很少有人认真考虑过,似乎马克思、恩格斯使用了就没有问题。其实马恩晚年虽借用了“文明”等术语,但对其核心内容如剥削、阶级性、虚伪、贪欲、国家镇压机器等都是持具体批判与整体否认态度的,尽管认为如此发展有其必然性,与其他学人用“文明”“野蛮”区分历史进步、停滞与落后,即无意中把知性专断与西方普遍性的观念传播开去明显不同,因为马克思是从人的全面发展和多数人得到解放出发看问题的。从历史研究追求平实公正应该使用更中性一些术语看,用褒义明显的“文明”来说某一时段历史的特质也是不合适的,因为说甲文明意味着乙不文明或野蛮,必然分出等级差别。回到传统中国,被视为“文明起源”这一段历史,中国古人认为是“大同”向“小康”、“公天下”向“私天下”之过渡,是以物役使人性的开始,是战争杀伐愈益激烈和彼此互助走向你争我夺、淳朴自然走向尔虞我诈的时期,此与马恩的认知明显具有相通之处。古史研究使用“文明起源”作为关键词展现的是西方资产阶级重物质、轻人道的历史观,体现的是西方资本主义价值观,不仅与马克思主义、中国文化精神相背离,也与史学自身追求相矛盾,说明目前的古史考量还深陷于西方中心观念之中,反省不够。在此认知基础上文章提出用相对平实的“文化源”代替不甚中性的“文明起源”,以作为中国文化精神开启之初一段历史的研究之用。

热带中西太平洋大眼金枪鱼的繁殖生物学特性

利用漂流金枪鱼延绳钓作业方式,于2018年5月—2019年3月对热带中西太平洋海域(WCPO,2°03′~11°17′S,163°14′~173°35′E)的大眼金枪鱼进行了取样,对其中886尾进行了繁殖生物学测定。使用广义线性模型(GLM)和多元有序Logistic回归模型,结合圆形统计方法,分析个体叉长等生物因素、渔获水深和月度等时空因素对繁殖生物学参数的影响。结果显示,雄性和雌性平均叉长分别为(132.2±19.1)cm和(125.4±16.8)cm。取样群体中,雌雄比为0.54±0.74,且叉长与雌雄比具有负相关(r=−0.263,P=0.016),叉长大于140 cm后,雄性占主导。GLM模型结果显示,性腺指数(GSI)与叉长之间存在显著的二次方关系,即个体GSI随着叉长增加,当雄性和雌性叉长分别达到130~140 cm和140~150 cm后,GSI随叉长下降。基于圆形统计发现,月度对个体GSI具有显著影响,其中雄性GSI上半年较下半年高(正弦显著,P<0.001),而雌性GSI年末和年初高于年中(余弦显著,P=0.021)。有序多元Logistic模型结果显示,性腺成熟度随叉长显著增加(P<0.001),雄性性腺成熟度在5—7月较高(余弦显著,P=0.004)。此外,栖息水层对雄性个体的性腺成熟度具有显著的影响(正相关,P<0.001)。雄性和雌性个体50%性成熟叉长分别为(96.13±1.24)cm和(104.93±2.60)cm。研究结果可为更好地了解热带WCPO大眼金枪鱼的繁殖生物学特征、科学养护热带WCPO大眼金枪鱼资源提供参考。

我国西瓜的来源与相关辽太祖西征等问题续论——兼及西瓜史研究者刘启振先生相关论说的问题

五代胡峤《陷虏记》共有三处使用“回纥”一词,多出于其拘押地福州(今内蒙古通辽市科尔沁左翼后旗一带)契丹人对本民族事迹的介绍,所指都是传统漠北回鹘,而非远在西域的高昌回鹘。辽太祖西征所拔“浮图城”是一座军事堡寨,在今陕西省榆林市子洲县,而非北疆庭州“可汗浮图城”。这些信息都进一步表明《陷虏记》所说“契丹破回纥得此种”是指从漠北回鹘牙帐一带获得西瓜,我国西瓜最初来自漠北蒙古高原腹地,是由西域经漠北回鹘间接传入。西瓜史研究者刘启振先生一味沿袭传统看法,刻意回避笔者论述,而其相关批评与否定意见无法动摇笔者所说,笔者上述发现使有关结论更为坚实。

清末民国时期中国民族文化西来说对《穆天子传》解读的影响

清末民国时期,经由日本传入中国的拉克伯里的中国民族文化西来说,在中国学术界广为流传,并对中国学术界的《穆天子传》交通地理和西王母传说的研究产生了极为深刻的影响。拉克伯里对《穆天子传》周穆王西征和西王母传说的各种新奇解说,直接影响到晚清民国中国学术界的《穆天子传》交通地理和西王母传说的研究走向。国粹派对周穆王西征和西王母传说“真实性”的各种发挥,不断遭到学术界的质疑和批判。中国民族文化西来说,对《穆天子传》交通地理研究起到了积极的推动作用的同时,也给中国的《穆天子传》交通地理研究增添了诸多错讹和混乱。

豫西黄河流域古地名源流及其文化内核

豫西黄河流域既是一个地理概念,也是一个文化范畴。在这一区域,黄河及其支流的自然山水、人文因素,催生了不少古地名。丰厚的历史文化积淀,使这一区域的地名源头,从遥远的上古时期延续到漫长的奴隶社会、封建社会乃至近代。地名作为历史的活化石,记载着这一区域的朝代更迭、历史变迁,记载着风云人物、风物传奇,也同样记载着民间百姓的生活和生存状态。豫西黄河流域古地名丰富的历史文化底蕴,主要生发于该区域文化内核——仰韶文化、殷商文化、秦汉文化、唐宋文化等,也得益于黄河这一华夏文明的摇篮。

东亚夏季风与热带海气相互作用研究进展

在东亚夏季风变异的众多影响因子中,热带海温是影响夏季风系统变化的主要原因。近年来,国内外学者在热带海温异常对东亚夏季风影响的研究方面取得了很大进展。本文从季节内、年际到年代际时间尺度,简要回顾了近年来关于热带海气相互作用影响东亚夏季风变异及其机理的研究进展,特别综述了关于ENSO(El Ni?o-Southern Oscillation)、热带印度洋和大西洋海温异常对东亚夏季风系统的影响和机理方面的主要研究进展。此外,本文还系统回顾了热带海温对东亚夏季风与冬季风关联的影响及过程。最后,提出了在热带海温异常影响东亚夏季风季节内尺度变化、全球变暖下热带海温的变化及其对东亚夏季风的影响等方面值得深入探讨的科学问题。

2024年春季中国东部降水季节内异常特征及成因分析

2024年春季(3—5月)我国平均降水量为163 mm,为1961年以来历史同期第六多,4—5月东部地区旱涝灾害并重,华南和江南大部降水较常年同期偏多,尤其是华南大部降水偏多5成以上,多次暴雨过程造成部分地区发生洪涝;而黄淮、江淮北部降水显著偏少,春季后期干旱迅速发展。春季“华南涝、黄淮旱”的形成与东亚大气环流关键系统异常及其季节内阶段性变化密切相关。4月异常偏强、偏南的西北太平洋副热带高压和低层850 hPa偏强的西北太平洋反气旋为华南和江南提供了有利的水汽输送条件,导致南方地区发生多次强降水过程;而黄淮干旱主要受4—5月持续偏强的朝鲜半岛-日本海高压(小笠原高压)和偏南的西北太平洋副热带高压共同影响。此外,春季El Ni o衰减和热带印度洋海温异常偏暖有助于激发异常偏强的西北太平洋反气旋,是我国南方强降水发生的重要海洋外强迫背景。

海南霸王岭不同起源林分森林群落特征及乔木碳储量研究

热带森林因具有很高的生物多样性和强大的生态服务功能而成为全球生态学研究的热点。然而,针对不同林分起源森林群落特征和碳储量之间的差异的研究报道却比较少见。本研究以海南霸王岭林区人工促进更新次生林(PF)、天然次生林(SF)和原始林(VF)3种不同起源的林分为研究对象,针对其群落的物种组成、群落结构、生物量和碳储量进行差异性分析,结果表明:(1)物种的丰富度大小为VF>SF>PF,径级分布均呈反“J”字型,表现为更新层>演替层>主林层的稳定的群落结构;(2)3种起源的林分乔木生物量大小排序依次均为:干>根>枝>叶,各生物量在径级分布上存在差异,PF、SF和VF各径级的生物量排序分别为Ⅱ>Ⅲ>Ⅰ>Ⅳ,Ⅳ>Ⅱ>Ⅲ>Ⅰ和Ⅳ>Ⅲ>Ⅱ>Ⅰ;(3)3种林分的乔木碳储量为105.01~199.47 t.hm^(-2),其中原始林碳储量最大,人工促进更新次生林最小,人工促进更新次生林乔木碳储量主要分布在径级Ⅱ的树木中,天然次生林乔木碳储量主要分布在径级Ⅱ和Ⅳ的树木中,原始林乔木碳储量主要分布在径级Ⅳ的树木中。研究结果可为热带林业经营管理、森林碳监测和评估提供理论支撑。