Comparative study of leaf anatomy of Malaysian species of Chionanthus and Olea (Oleaceae) with special reference to foliar sclereids

The foliar anatomy of 15 Malaysian species of Chionanthus and 3 species of Olea is described and compared with particular reference to sclereids. The anatomy of the two genera is similar except that Chionanthus shows a wider range in sclereid form, eight kinds ofsclereid are recorded. Filiform sclereids are present in all Olea species and most Chionanthus species examined, additional kinds ofsclereid found in these Chionanthus species include astrosclereids, dendrosclereids, osteosclereids and polymorphic sclereids, with brachysclereids of several forms in the petiole. Quantity of sclereids is not related to coriaceousness, which is determined by leaf thickness. Anatomical characters do not support any major grouping of species within Chionanthus and provide further evidence that the sections, Eulinocitra and Ceranthus , are untenable. The distinction between the lepidote scales of Olea and the peltate hairs common to all oleaceous genera is discussed.     

A chemotaxonomic survey of flavonoids in leaves of the Oleaceae

Leaves of 97 taxa representing all the genera at present recognized in the family Oleaceae were surveyed for flavonoids. Four flavonol glycosides were found to be common, the 3-glucmides and 3-rutinosides of quercetin and kaempferol, as were four flavone glycosides, namely the 7-glurosides arid 7-rutinosides of luteolin and apigenin. Among rarer constituents detected were luteolin 4'-glucoside, eriodictyol 7-glucoside, chrysoeriol 7-glucoside, an apigenin-di-C-glycoside and several higher glycosides of quercetin. The species and genera surveyed fell into two groups: those with flavonol glycosides alone; and those with both flavonol and flavone glycosides. The most striking correlation was with chromosome number (and subfamily division) since almost all taxa with a basic number of 11, 13 and 14 had only flavonol glycosides, whereas most taxa with x = 23 had both types of flavonoid. Evolutionary advancement in the family appears to involve the gradual replacement of flavonol by flavone glycosides. Indeed, a few tam, notably Nestegis apelala, Picconia excelsa and Tesserandra fluminense , lacked flavonol glycosides in the leaves completely. At the lower levels of classification, the distribution of flavonoids is of less interest. However, the patterns in Linociera and Chionanthus , two taxa recently made congeneric, are sufficiently different to suggest that this decision might have to be reconsidered when more is known of their chemistry. Otherwise leaf patterns generally fit in with the existing generic classification in the family.     

Study on the Pollen Morphology of the Chinese Family Oleaceae

This paper deals with the pollen grains of 11 genera, 22 species in Chinese Oleaceae. A comparative study on the pollen grains was carried out by means of scanning electron microscope and light microscope. The pollen grains of the family Oleaceae are almost spheroidal, oblate and prolate, in polar view tlie majority of the pollen grains are tri-lobulate-circular, the minority are tetra-lobulate-circular and dilobulate-circular. Pollen size: (15-65) × (12- 60)μ, 3-colporate and 3-colpate the minority of the pollen grains 4-colpate and 2- colpate colpus usually distinct and the en doaperature vague. The exine oonsists of two layers, the sexine thicker than the nexine, with big reticulum or fine reticulum, the majority of the reticulum are very distinct. On the basis of the pollen size and exine ornamentation, the pollen grains are divided into following two main types: (1) The larger pellen grains and the exine with big reticulum are found in the genera: Jasminum, Nyctanthes, Ligustrum, and Syringa. (2) The smaller pollen grains and the exine with finer reticulum are found in the genera: Osmanthus, Olea, Chionanthus, Fraxinus, Forsythia, Fontanesia and Linociera. In view of the features of pollen morphology, this family is much similar to the family Itamamelidaeeae. For example, the first pollen type resembles the genus Coryiopsis of the family Hamamelidaceae, but there are some differences between them, the former with a bigger reticulate exine and without any colpal membrane, the latter with a finer reticulate apocolpium and eolpate membrane. The second pollen type is much similar to that of the genera Hamamelis and Loropetalum of family Hamamelidaceae.     

New taxa from the Avila and Naiguatá Mountains,Venezuela

Ten new species (Billbergia manarae, Croizatia naiguatensis, Croton huberi, Rinorea oraria, Anaectocalyx manarae, Linociera avilensis, Cynanchum beatricis, C. manarae, Matelea costanensis, and M. manarae) are described in preparation for the forthcoming Flora of Avila and Naiguatá.     

中国木犀属植物叶脉形态及其分类学意义

观察了中国木犀属植物4组19种叶脉形态。主要分析木犀属植物叶片脉序走向,脉序为环结曲行或半直行羽状脉。二级脉急转曲行或半直行,叶脉分支一般为4级,少数5级。盲脉1～2次分支,少数3次或不分支。仅柊树叶缘末级脉汇合成边脉.部分叶缘具齿,叶缘齿性状不稳定,因其内主脉不同而在本属种间表现出一个连续的变异过程。圆锥花序组与李榄属和木犀榄属从叶片脉序特征方面表现出较近的亲缘关系。四个组的叶脉形态在演化上关系上与花粉形态表现相一致。编写了叶片脉序特征分种检索表。     

白蜡虫七种寄主植物枝条树皮比较解剖研究

采用常规石蜡切片法解剖观察了白蜡虫7种寄主植物一年生枝条树皮横切面结构特征,结果表明:白蜡虫7种寄主植物一年生枝条树皮从内到外由次生韧皮部、初生韧皮部纤维束、皮层和周皮组成;次生韧皮部横向系统均由筛管、伴胞和薄壁细胞组成;轴向系统由射线组成。木栓层以美国白蜡和流苏细胞层数最多,达10～12层;华南小蜡、紫药女贞和白枪杆次之,为5～8层;女贞和白蜡树最少,分别为2～3和3～4层。初生韧皮部纤维束排列整齐连接为带状或分散,女贞属纤维连接成带状,白蜡属和流苏属纤维分散。带状纤维层厚薄不均,厚度在26.93±13～59.15±7μm之间,以白枪杆纤维层最厚,为59.15±7μm;美洲白蜡次之,为50.05±7μm;白蜡树最薄,为26.93±13μm。分散型纤维束直径在25.12±13～76.15±36μm之间,纤维束直径大小顺序为:流苏(76.15±36μm)>紫药女贞(43.44±10μm)>女贞(25.12±13μm)。女贞、紫药女贞和流苏纤维束间距分别为78.53±39μm、149.78±27μm和212.02±95μm。次生韧皮部厚度在48.52±12～377.44±24μm之间,以女贞的次生韧皮部最厚,达377.44±24μm,华南小蜡最薄,为48.52±12μm。树皮次生韧皮部厚、木栓层数少和纤维束直径小为白蜡虫优良寄主植物的显著特征。     

14种木犀榄族植物叶表皮微形态的研究

利用光学显微镜和扫描电子显微镜对木犀榄族（Oleeae）5属14种植物的叶表皮微形态特征进行了观察,结果表明：（1）叶表皮细胞形状有无规则形和多边形两种;下表皮腺点的数目远远大于上表皮,流苏树上表皮细胞没有腺点;叶下表皮有气孔器,形状为圆形、椭圆形;气孔器均为不规则型;气孔器外围角质层有放射状、条状、环状、颗粒状等多种类型;（2）气孔器和叶表皮细胞许多特征具有明显的种间差异,可以作为种间鉴定的重要依据;（3）叶表皮微形态结构上的许多共同特征,表明木犀榄族植物是单独一自然类群。上述特征可为木犀榄族植物属及物种的划分与鉴定、系统演化关系的探讨等提供参考。     

Optimized construction of microsatellite-enriched libraries

The construction of microsatellite-enriched libraries is an indispensable tool to search for molecular markers as complete genome sequences are still not available for the majority of species of interest. Numerous protocols are available in the literature for the construction of these libraries; however, sometimes their low efficiency or lack of optimization in the protocols can restrict their efficacy. We have designed and tested various adapters and ligation methods; we also tested oligo-repeat combinations and hybridization temperatures, and created libraries with this new protocol for four organisms: Ipomoea batatas (L.) Lam, Chionanthus retusus Lindley & Paxton, Rotylenchulus reniformis Linford & Olivera and Puccinia kuehnii W. Krüger. The number of microsatellites detected for these species ranged from 2494 to 3919 per Mb of nonredundant sequence, that was 0.86 and 1.53 microsatellites per contig, with 37-66% of di-nucleotide motifs and 21-49% of tri- to octa-nucleotide repeats combined. A simplified protocol is provided for the successful generation of SSR-enriched libraries.     

6种热带雨林木本植物幼苗光合诱导的研究

 在晴天上午适宜条件下,测定了生长在模拟林下光环境中的6种热带雨林木本植物幼苗的光合特性和光合诱导特征。6种植物分别为先锋树种大穗野桐(Mallotus macrostachys),冠层树种绒毛番龙眼(Pometia tomentosa)、玉蕊(Barringtonia pendala)、望天树(Shorea chinensis)、滇南插柚紫(Linociera insignis)和林下灌木睫毛粗叶木(Lasianthus hookeri)。研究结果表明：暗处理3 h的叶片经连续饱和强光照射后,6种植物的净光合速率呈s形到双曲线形。6种植物达到90%最大净光合速率的时间为4.4～12.5 min,这与所报道的其它热带雨林中一些阴生植物的诱导速率相近。大穗野桐和睫毛粗叶木的诱导速率最快,达到50%和90%最大净光合速率的时间为其它4种冠层植物幼苗的1/2至1/3。诱导过程中,最大气孔导度对强光的响应明显滞后于净光合速率。充分诱导的叶片在黑暗中20 min后,6种植物的诱导状态都较高。其中,大穗野桐的诱导状态消失相对较快,这可能与其气孔导度和羧化能力的快速降低有关。玉蕊诱导状态的消失主要与生化限制有关,因为此时它的气孔导度仍维持相对较高的值。而睫毛粗叶木较高的气孔导度和羧化能力的维持导致了很高的诱导状态。林下植物这种对强光的快速反应和黑暗中高的维持状态对有效利用光斑具有重要的意义,这与其一生中在林下生长和更新的特点是一致的。     

黄土高原不同气象因子对中国沙棘亚居群遗传多样性的影响

顶生金花茶(Camellia terminalis)是一种濒危植物,主要分布在广西天等县石灰岩山钙质土上的常绿阔叶林内.采用样地调查、统计分析和回归模型预测等方法,对顶生金花茶种群的分布环境、资源量现状、大小和高度结构等进行了研究.结果表明:该种群主要依存于天等县小山乡的蚬木-石山樟林(P1)和任豆-蚬木林(P2)、福新乡的枝花李榄-石山楠林(P3)和齿叶大风子-闭花木林(P4)4种群落,构成灌木层的优势种和共优种;P1、P3和P4种群处于群落较稳定的典型常绿季雨林中,结构较完整,属于稳定或增长型;P2种群由于恶劣环境和频繁人为干扰的共同胁迫,有衰退的趋势;与小山乡生境相比,福新乡相对冷凉湿润的气候条件、丰厚肥沃的土层以及较轻度的人为干扰有利于顶生金花茶种群的发展.目前顶生金花茶种群的资源量有限,建议列为"严重濒临灭绝"(CR)等级.     

Plant biodiversity and conservation of tropical semi-evergreen forest in the Shervarayan hills of Eastern Ghats, India

Species diversity, density, population structure and dispersion patterns of all trees and lianas (30cm gbh) were inventoried in a tropical semi-evergreen forest in the Shervarayan hills of Eastern Ghats, south India. Such data are necessary for ecosystem conservation of the under-studied Eastern Ghats, as extensive forests here have already been converted to coffee and orange plantations and the landscape changed due to aluminium ore mining and quarrying. Four 1-ha plots were established in Sanyasimalai (SM) reserve forest of the Shervarayan hills, one plot (SM1) located close to mining and quarrying area, two other contiguous plots (SM2 and SM3) located in selective felling area and the fourth (SM4) in a relatively undisturbed forest. These are 1 to 4km apart in the same semi-evergreen forest tract. In the four study plots a total of 3260 stems (mean density 815ha–1) covering 80 species in 71 genera and 44 plant families were recorded. Species richness was greatest in the undisturbed plot SM4 (50), while lowest (33) in the selectively felled site SM2. The forest stand (SM4) was also denser (986 stemsha–1) and more voluminous (basal area 44.3m2ha–1 as compared with the site mean of 35m2ha–1) than the other plots. Four trees, Chionanthus paniculata, Syzygium cumini, Canthium dicoccum and Ligustrum perrottetii dominated the stand, collectively contributing to >50% of the total density. Species richness and stand density decreased with increasing tree girths. The forest stand contained a growing population, but there was considerable variation in basal area distribution between the plots. Trends in species population structure varied, particularly for selective-felled species. Most species exhibited clumped dispersion of individuals both at 0.25ha and 1-ha scales. Variation in plant diversity and abundance are related to site attributes and human impacts.     

Photosynthesis and photoinhibition after night chilling in seedlings of two tropical tree species grown under three irradiances

We investigated the physiological effect of night chilling (CN) on potted seedlings of two tropical tree species, Calophyllum polyanthum and Linociera insignis, in Xishuangbanna, southwest China. Seedlings grown under 8, 25, and 50 % daylight for five months were moved to a 4–6 °C cold storage house for three consecutive nights, and returned to the original shaded sites during the day. CN resulted in strong suppression of photosynthesis and stomatal conductance for L. insignis, and reduced photorespiration rates, carboxylation efficiency, and maximum photochemical efficiency of photosystem 2 (PS2) at dawn and midday for both species. CN increased dawn and midday rates of non-photochemical quenching, and the contents of malondialdehyde and H₂O₂ for both species. CN also induced inactivation or destruction of PS2 reaction centres. The impacts of CN on tropical seedlings increased with the number of CN. Shading could significantly mitigate the adverse effects of CN for both species. After 3-d-recovery, gas exchange and fluorescence parameters for both species returned to pre-treatment levels in most cases. Thus CN induced mainly stomatal limitation of photosynthesis for L. insignis, and non-stomatal limitation for C. polyanthum. C. polyanthum was more susceptible to CN than L. insignis. Fog, which often occurs in Xishuangbanna, could be beneficial to chilling sensitive tropical seedlings in this area through alleviating photoinhibition or photodamage by reducing sunlight.     

Photosynthetic Characteristics,Dark Respiration,and Leaf Mass Per Unit Area in Seedlings of Four Tropical Tree Species Grown Under Three Irradiances

We investigated the effect of growth irradiance (I) on photon-saturated photosynthetic rate (P _max), dark respiration rate (R _D), carboxylation efficiency (CE), and leaf mass per unit area (LMA) in seedlings of the following four tropical tree species with contrasting shade-tolerance. Anthocephalus chinensis (Rubiaceae) and Linociera insignis (Oleaceae) are light-demanding, Barringtonia macrostachya (Lecythidaceae) and Calophyllum polyanthum (Clusiaceae) are shade-tolerant. Their seedlings were pot-planted under shading nets with 8, 25, and 50 % daylight for five months. With increase of I, all species displayed the trends of increases of LMA, photosynthetic saturation irradiance, and chlorophyll-based P _max, and decreases of chlorophyll (Chl) content on both area and mass bases, and mass-based P _max, R _D, and CE. The area-based P _max and CE increased with I for the light-demanders only. Three of the four species significantly increased Chl-based CE with I. This indicated the increase of nitrogen (N) allocation to carboxylation enzyme relative to Chl with I. Compared to the two shade-tolerants, under the same I, the two light-demanders had greater area- and Chl-based P _max, photosynthetic saturation irradiance, lower Chl content per unit area, and greater plasticity in LMA and area- or Chl-based P _max. Our results support the hypothesis that light-demanding species is more plastic in leaf morphology and physiology than shade-tolerant species, and acclimation to I of tropical seedlings is more associated with leaf morphological adjustment relative to physiology. Leaf nitrogen partitioning between photosynthetic enzymes and Chl also play a role in the acclimation to I.     

弄岗北热带喀斯特季节性雨林群丛数量 分类及与环境的关系

以弄岗15 ha北热带喀斯特季节性雨林监测样地各样方的相对海拔、坡度、坡向、凹凸度和物种重要值数据为变量, 采用多元回归树方法将喀斯特季节性雨林森林群落分为8个群丛。同时, 按乔木层、亚乔木层优势种为主, 灌木层指示种为辅的方法分别把8类群丛命名为: (A)南方紫金牛(Ardisia thyrsiflora)–苹婆(Sterculia monosperma)–中国无忧花(Saraca dives)群丛, 该群丛类型主要分布于土壤和空气的湿度都较大的谷底边缘; (B)对叶榕(Ficus hispida)–苹婆–董棕(Caryota obtusa)群丛, 该群丛类型主要分布于伴有季节性水淹、土壤和空气湿度都很大的谷底; (C)山石榴(Catunaregam spinosa)–广西牡荆–蚬木(Excentrodendron tonkinense)群丛, 该群丛类型主要分布于受太阳直射时间较长、水分条件中等偏旱的中下坡阳坡地带; (D)垂茉莉(Clerodendrum wallichii)–苹婆–广西棋子豆(Cychidendron guangxiensis)群丛, 该群丛类型主要分布于受太阳直射时间稍短、水分条件适中的中下坡阴坡地带; (E)米仔兰(Aglaia odorata)–闭花木(Cleistanthus sumatranus)–蚬木群丛, 该群丛类型主要分布于土壤湿度中等偏旱的中上坡半阴坡地带; (F)割舌树(Walsura robusta)–闭花木–蚬木群丛, 该群丛类型主要分布于土壤湿度中等偏旱、比较陡峭的半阳坡地带; (G)枝花流苏树(Chionanthus ramiflorus)–广西牡荆–蚬木群丛, 该群丛类型主要分布于坡度缓和、太阳直射的时间较短、水分条件适中的垭口部位; (H)齿叶黄皮(Clausena dunniana)–黄梨木(Boniodendron minius)–蚬木群丛, 该群丛类型主要分布于受到太阳直射时间最长、岩石裸露度最大、气温干燥、土壤水分严重不足的山顶及其周围。群丛划分说明该区域植被差异主要源于相对海拔和坡向变化, 各群丛物种组成并不存在明显界限, 而是随环境梯度逐渐变化, 反映了植被分布具有连续性, 间断只是相对的。     

Lignans and secoiridoids from the root bark of Chionanthus virginicus L.: isolation, identification and HPLC analysis

Five lignans, phillyrin (1), pinoresinol-beta-D-glucoside (2), pinoresinol di-beta-D-glucoside (3), phillyrin-2-O-beta-D-glucoside (6), phillyrin-6-O-beta-D-glucoside (7), and three secoiridoids, oleuropein (4), ligustroside (5) and angustifolioside B (8), have been isolated from the root bark of Chionanthus virginicus L. (Oleaceae), a raw material used in the commercial preparation of homeopathy tinctures. Compound 6 is a new lignan, and compounds 2, 3, 4, 5, 7 and 8 are described for the first time in the title plant. The structures of these compounds were elucidated by spectroscopic methods (NMR and HPLC-MS). An isocratic HPLC method for the rapid characterisation and quantification of the major constituents, 1 and 4, of the root bark is described and validated.     

Species of the genus Thrips from India (Thysanoptera)

Abstract. The species of Thrips Linnaeus from the Indian region are revised, and a key is provided to the thirty-three valid species, including eight new species and one new subspecies, Eight species customarily included in Taenio-thrips Amyot & Serville are here included in Thrips and six species are newly placed in synonymy: Thrips hawaiiensis (Morgan) (= Thrips exilicornis Hood from Africa); Thrips palmi Karny (= leucadophilus Priesner from Sudan); Thrips brunneus Anan. & Jaga. ( =speratus zur Strassen from South West Africa); Thrips tabaci Lind.(= kallarensis (Anan.) from India); Thrips sumatrensis Priesner (= lucaenae Moulton from Guam); Thrips simplex (Morison) (= Taeniothrips quinani Moulton from South Africa). Isoneurothrips Bagnall is regarded as a synonym of Thrips , and Isothrips is treated as a synonym rather than as a sub-genus. Two nominal species, beharensis (Ram. & Marg.) and rostratus (Ram. & Marg.) are considered unrecognizable at present.     

Taxonomic survey of fossil isocrinids with a list of the species found in the USSR

The taxonomic scheme of the two families of the order Isocrinida (Isocrinidae and Pentacrinidae) is given. The first family is divided at five subfamilies: Balanocrininae, Isocrininae, Metacrininae, Diplocrininae and Isselicrininae. Six genera are included in subfamily Balanocrininae: Balanocrinus (four species found in USSR), Laevigatocrinus (USSR: 3 species), Margocrinus (USSR: 4 species), Percevalicrinus (USSR: 5 species), Singularocrinus nov. gen. (monotypic) and Terocrinus nov. gen. (USSR: 1 species). Five fossil genera are included in subfamily Isocrininae: Chariocrinus (USSR: 1 species), Chladocrinus (USSR: 4 species), Isocrinus (USSR: 6 species), Raymondicrinus nov. gen. (Oligocene of USA : 2 species) and Tyrolecrinus nov. gen. (6 triassic species). Fossil representatives of three genera, namely, Metacrinus (Miocene-Recent), Nielsenicrinus (USSR: 4 species) and Cainocrinus (USSR: 1 species) are noted in subfamily Metacrininae. Five genera are included in subfamily Isselicrininae: Austinocrinus (USSR: 5 species), Buchicrinus (USSR: 5 species), Doreckicrinus (USSR: 1 species?), Isselicrinus (USSR: 4 species) and Praeisselicrinus (USSR: 1 species). Two genera are included in family Pentacrinidae: Pentacrinus (USSR: 1 species) and Seirocrinus (USSR: 4 species). Besides, the localities of 24 isocrinid species, systematic position of which is unknown, are listed (from Triassic upon Cretaceous). Three erroneous attributions to Isocrinida in USSR are pointed out. In the conclusion an outline of the phylogeny of the Isocrinida is discussed. For a majority of the wide-spread species in USSR figures are given.     

16个双子叶植物名称后选模式指定

在整理保存于中国科学院植物研究所中国国家植物标本馆（PE）双子叶植物模式标本时,根据《国际藻类、菌类、植物命名法规》（墨尔本法规）规则9.5,发现台湾榕（桑科）、短齿楼梯草（荨麻科）、贯叶马兜铃（马兜铃科）、唐古特扁桃（蔷薇科）、短梗稠李（蔷薇科）、长序稠李（蔷薇科）、纤细石斑木（蔷薇科）、蒙古绣线菊（蔷薇科）、细柄罗伞（紫金牛科）、台湾山矾（山矾科）、华流苏（木犀科）、三叶白蜡树（木犀科）、滇素馨（木犀科）、紫花醉鱼草（马钱科）、蒙古白前（萝藦科）、长叶微孔草（紫草科）名称的模式为合模式。遵照规则8.1、9.11和9.12,以及辅则9A.3的精神,对这16个名称做出后选模式指定。     

Revision of the orchid bee subgenus Euglossella (Hymenoptera, Apidae), Part I, The decorata species group

Euglossella, one of the most distinctive subgenera of orchid bees of the genus Euglossa, is composed of two characteristic assemblages of species, one of them comprising bees bearing the strongly metallic integument trademark of the genus (viridis species group), and the other consisting of bees with a brown integument shaded with metallic iridescence (decorata species group). Here we provide the first of two parts of a revision of Euglossella, providing diagnostic definitions for the subgenus, the decorata species group, and all the species included therein. Six species are included in the decorata group, one new: Euglossa (Euglossella) aurantia, sp. n.; Euglossa (Euglossella) apiformis Schrottky, resurrected status; Euglossa (Euglossella) decorata Smith, revised status; Euglossa (Euglossella) singularis Mocsáry, revised status; Euglossa (Euglossella) cosmodora Hinojosa-Díaz and Engel; and Euglossa (Euglossella) perpulchra Moure and Schlindwein. Euglossa meliponoides Ducke and Euglossa urarina Hinojosa-Díaz and Engel are newly synonymized under Euglossa decorata, Euglossa decorata ruficauda Cockerell is synonymized under Euglossa singularis, and a neotype is designated for Euglossa apiformis.     

弄岗喀斯特季节性雨林不同群丛物种多样性随海拔的变化

为研究北热带喀斯特季节性雨林不同群丛物种多样性特征及其随相对海拔变化,在对广西弄岗15 hm2北热带喀斯特季节性雨林样地进行群丛划分的基础上,运用丰富度指数、物种多样性指数和均匀度指数对处于不同相对海拔高度群丛的物种多样性以及不同群丛乔木层、亚乔木层和灌木层的物种多样性进行比较。结果表明弄岗喀斯特季节性雨林各群丛的多样性指数存在极显著差异(P0.01),各群丛类型的物种多样性指数的顺序为:枝花流苏树-广西牡荆-蚬木群丛齿叶黄皮-黄梨木-蚬木群丛山石榴-广西牡荆-蚬木群丛南方紫金牛-苹婆-中国无忧花群丛垂茉莉-苹婆-广西棋子豆群丛割舌树-闭花木-蚬木群丛米仔兰-闭花木-蚬木群丛对叶榕-苹婆-董棕群丛;Patrick丰富度指数、Shannon多样性指数和Pielou均匀度指数在中坡以下(弄岗样地相对海拔76.3 m以下)随相对海拔变化规律符合"中间高度膨胀"理论,即处于该地段中部群丛的多样性高,相对海拔较低和较高的群丛的多样性低;而中坡以上(弄岗样地相对海拔76.3 m以上)多样性随相对海拔增高而增大;群丛各层次多样性与热带山地雨林一致,与亚热带喀斯特常绿阔叶林截然相反,呈现出乔木层亚乔木层灌木层。这些结果表明地形空间异质性导致的水热差异影响着北热带喀斯特季节性雨林物种多样性,相对海拔低、水热条件较好的中、下坡乔木多样性高,相对海拔较高、条件恶劣的中、上坡亚乔木、灌木多样性较高,所以在对喀斯特地区水热条件恶劣的中、上坡地带进行植被恢复时,应更多选择亚乔木、灌木。