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  “《飞机”译为未确定词的双语例句
     Application of HB 6448,Digital Test and Measurement of Performance Parameters of Aircraft Power Supply System
     HB 6448《飞机供电系统性能参数的数字式测试》的应用
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     Based on the investigation and research,the paper gives a testing method,which measures the taking off and landing distance of airplanes with the laser locating system for airplane's trace. And by way of the field measuring on plateau airports,we have got the integrated modifying coefficients of three kinds of airplanes'taking off and landing running distance such as H6.All of these provide scientific basis for the runway length design of the plateau airport.
     在调研论证的基础上 ,提出了利用《飞机起落航迹激光定位系统》测定飞机起飞着陆滑跑距离的测试方法 ,并通过高原机场实地测试 ,得出了三种飞机在高原机场上起飞着陆滑跑距离的综合修正系数值 ,为高原机场跑道长度设计提供了可靠的理论依据。
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     The CAI course ware of the aircraft hydraulic system was exploited based on VB6.0 platform and applied to the teaching and experimental teaching of the core specialized course—Aircraft Systems. It has achieved good results.
     基于VB6.0平台开发了飞机液压系统CAI课件,并运用于专业核心课程《飞机系统》的教学与实验教学,达到了良好的效果。
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     In this paper,Successful practical is applied to the airplane Barometric Altimeter Reliability,and Improved barometric altimeter reliability.
     本文运用了6σ原理,成功的实践了《飞机气压度表的可靠性水平》的改进项目,有效地提高了飞机高压高度表的可靠性水平。
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     In aircraft electric power system,electric power source is the key device for aircraft's performance,the quality of electric supply directly effects various utilization equipment in aircraft,so it must meet the requirements of GJB 181A,the most important standard is AC distortion spectrum and AC distortion factor.
     在航空电气系统中,电源系统是飞机正常工作的关键部件,其供电质量的好坏直接影响机上的各种用电设备,所以其供电指标必须满足GJB 181A《飞机供电特性》的要求,在这些指标中最重要的一项是交流畸变系数与畸变频谱。
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  相似匹配句对
     Cable Arrangement in an Aircraft
     飞机电缆敷设
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     Magnetization of aircraft
     飞机的磁化
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A method based upon simple diffraction theory is described for the calculation of modified paraboloid reflectors to produce from a point source a shaped beam of arbitrary shape in one plane and uniformly narrow in the perpendicular planes. A specific application of the shaped beam antennas is in connection with radar antennas designed for height finding. In this case the antenna must have a sharp elevation beam for obtaining precise elevation information and a rapid elevation scan. The beam must be relatively...

A method based upon simple diffraction theory is described for the calculation of modified paraboloid reflectors to produce from a point source a shaped beam of arbitrary shape in one plane and uniformly narrow in the perpendicular planes. A specific application of the shaped beam antennas is in connection with radar antennas designed for height finding. In this case the antenna must have a sharp elevation beam for obtaining precise elevation information and a rapid elevation scan. The beam must be relatively broad in azimuth in order that the target will be held in the beam long enough to obtain height information. If a fixed minimum of illumination is to be achieved at a given linear distance on both sides of the center line of the azimuth beam, the amplitude pattern must have the so-called "double cosecant" or "beavertail" shape.

本论文讨论如何利用简单衍射理论,计算改良抛物面反射器天线幅射之图型。此反射器可将一无方向性辐射源之能量聚集于任何形状之波束中。此原理可以应用在地面上或船面上寻求飞机高度雷达天线之设计。在此类雷达中,天线之方位图型必须为“双馀割平方”式;其特性为自波束对称轴线起,至其两端,辐射一次路程之功率,与方位角之馀割平方成正比。得此图型之最简易方法为置一狭窄之铅垂金属条于一截形抛物面反射器之中心,金属条之宽度,可改变波束之方向性;其支距,即金属条与反射器之距离,可影响两反射波之位相。故改变金属条之宽度及其支距,可得欲得之图型。 利用衍射及干涉理论,计算金属条及截形抛物面所生之总图型为:在方位面内,幅射强度J_H与水平角θ之关系为: J_H =AA[sin~2(15πsinθ)/(15πsinθ)~2-2(1-cosπ/4)sin(2πsinθ)/2πsinθ(sin(2πsinθ)/2πsinθ-sin(15πsinθ)/15πsinθ)]A为辐射波振幅,A为A之复共轭数。计算之结果与实验之结果,颇为一致。

In order to meet the urgent demand of chemical control of wheat rusts, studies were made in the present work on the application, of rust chemotherapeutants. Greenhouse tests have been started since 1958, and out of 250 chemicals sulfanilic acid, sodium

治疗剂的应用是防治小麦锈病的新方向,已引起国际上普遍重视,并有不少成功的先例。国内已往所应用的防锈药剂,仍局限于保护剂。1958年通过温室小麦幼苗的接种喷药试验,从将近300种化学药剂中选出氨基苯磺酸及其钠盐、氨基磺酸钙、氨基磺酸铵及盐酸苯肼等5种药剂对小麦三种锈病(条锈、叶锈、干锈)均具有优良的治疗效果。这5种药剂中以氨基苯磺酸及其钠盐和氨基磺酸钙的治疗效果较为突出。喷布0.4%氨基苯磺酸、1%氨基苯磺酸钠和0.5%氨基磺酸钙后对条锈病的治疗效果分别为70%、65%和70%;对叶锈病的治疗效果分别为80.7%、73.2%和84.4%,喷布的浓度愈高防治效果愈大,每次喷药的有效时期约为二星期。1959年先后在福建省莆田县、安徽省歙县和宿县、河南信阳及吉林公主岭等地进行的田间试验一致肯定了温室的结果。每亩用量为200—300斤水溶液,喷施2—3次。0.4%氨基苯磺酸对条锈病、叶锈病和稈锈病的平均防治效果分别为80.2%、93.7%和89.2%;1%氨基苯磺酸钠对三种锈病的平均防治效果分别为87.3%、85.8%和84.1%;0.8%氨基磺酸钙对三种锈病的平均防治效果分别为80.2%、96.6%及77.7%,但使...

治疗剂的应用是防治小麦锈病的新方向,已引起国际上普遍重视,并有不少成功的先例。国内已往所应用的防锈药剂,仍局限于保护剂。1958年通过温室小麦幼苗的接种喷药试验,从将近300种化学药剂中选出氨基苯磺酸及其钠盐、氨基磺酸钙、氨基磺酸铵及盐酸苯肼等5种药剂对小麦三种锈病(条锈、叶锈、干锈)均具有优良的治疗效果。这5种药剂中以氨基苯磺酸及其钠盐和氨基磺酸钙的治疗效果较为突出。喷布0.4%氨基苯磺酸、1%氨基苯磺酸钠和0.5%氨基磺酸钙后对条锈病的治疗效果分别为70%、65%和70%;对叶锈病的治疗效果分别为80.7%、73.2%和84.4%,喷布的浓度愈高防治效果愈大,每次喷药的有效时期约为二星期。1959年先后在福建省莆田县、安徽省歙县和宿县、河南信阳及吉林公主岭等地进行的田间试验一致肯定了温室的结果。每亩用量为200—300斤水溶液,喷施2—3次。0.4%氨基苯磺酸对条锈病、叶锈病和稈锈病的平均防治效果分别为80.2%、93.7%和89.2%;1%氨基苯磺酸钠对三种锈病的平均防治效果分别为87.3%、85.8%和84.1%;0.8%氨基磺酸钙对三种锈病的平均防治效果分别为80.2%、96.6%及77.7%,但使用后叶部呈现药害。同样情况下波美0.5度石硫合剂对三种锈病的平均防治效果仅为50%左右。氨基苯磺酸钠易溶于水,当使用30%的浓度,每亩喷施6斤时,对稈锈病的防治效果仍然良好,有希望应用于大面积飞机防治。磺酸制剂除了能抑制锈菌夏孢子形成外还能改变小麦品种对条锈病的反应。对条锈病高度感染的碧玛一号(反应类型为“4”)喷药后变为高度抵抗(反应类型为“1”),产生典型的过敏性枯斑。喷布氨基苯磺酸后较对照有不同程度的增产(5—30%),对种子萌发并无不良影响,但氨基磺酸钙对种子萌发有显著的抑制作用。应用氨基苯磺酸的植株所产种子经初步分析发现种子含有微量药剂,对人畜无不良影响;喷布浓度为0.4%时种子含药量仅为2.28—7.80微克/每克种子重,其中至少有一半药量由喷布于穗部的药附着于种子表面。锈菌夏孢子发芽试验证明,水洋菜中含0.01—0.04M氨基苯磺酸时由于酸性较强(pH3—4),对孢子发芽有抑制作用;当pH值调节至6以上时,孢子仍能正常萌发。叶面喷施氨基苯磺酸后亦因酸度提高,对孢子萌发亦有抑制作用。氨基苯磺酸在植株体内的抑菌浓度视药剂在接种后施用的早晚而有差异,接种后1—5天施用0.01M浓度后的体内,药剂最终抑菌浓度为125—401微克/每克鮮叶重。黑麦成株试验局部施药后在短期内卽转运至未喷药的部位,距施药部位愈远的叶片、叶鞘和莖干含药量愈低;小麦幼苗第一叶喷药后6天第二叶卽含有很高药量,19天后仍保持900微克/每克鮮叶,高于有效抑菌浓度。氨基苯磺酸在植株体内抑菌作用的机制仍须进一步进行研究。

This special issue is on the request of the Yunnan provincial government to fullfill a new Plan in the following years to establish series of Nature Conservation Stations throughout this province. As the Socialism construction in our country is so fast, especially the influence of the great-leap forward of 1958, that stimulate everything to meet the modernization of new China. Plans for the establishment of Naturc Conservation Station in Yunnan is also one of the new things omorged in that year. There are five...

This special issue is on the request of the Yunnan provincial government to fullfill a new Plan in the following years to establish series of Nature Conservation Stations throughout this province. As the Socialism construction in our country is so fast, especially the influence of the great-leap forward of 1958, that stimulate everything to meet the modernization of new China. Plans for the establishment of Naturc Conservation Station in Yunnan is also one of the new things omorged in that year. There are five main articles containing in this volumc, they are, first one, the Ta-Mon-Lung Nature Conservation Station, second one the Mong-Run-Station; third the Mon-La Station; fourth, the Mon-Yang-Station; and finally the Ching-Tung, Wu-Liang-Shan Nature Conservation Station. All of the five stations are situated along the east and west banks of the Lan-Tzeong-Kiang river, and lie between 21°-25°latitude north. The first four Stations lie within Si-Shion-Ban-Na district, which is the southernmost part of the Yunnan province, on the latitude 21°-22°30′ north longitude 99°55′-101°45′ east. In general the altitude of this district is 540-1000 moters above the sea level, except a few mountain peaks reach 1800 meters high. The total area is estimated to be 25,000 square km. and with Lan-Tzeong-Kiang lows all throngh the entire territory from the north west to the south east. It is one of the richest and most lovable tropical and subtropial regions in China. Clinatically, it is a hot and humid place, without seasenal changes in the year, but having very distinct rain and dry seasons, or a fog eason in adlition. Yearly priptation is 1000—1800 mm. Yearly average temperature is above 18℃. Ching—Tung Station has the same type of limate as that of Si-Shion-Ban-Na. Geographically the mountain range and river course are running in the direction from north west to south east, throughout this whole district and topographically there are flat mountain tops, steep-walled slopes, astal lands, and inter-mountain basins, provided with rich vegetation type. The live nature conservation stations in this special issue have each mphasized on different topics. Such as Ta-Mon-Lung Station sticks to the dry type of sasonal rain forest, Mon-Rung Station has emphasized on the description of the castal type of rain forest, Mon-La Station descries the wet type of seasonal rain forest, Mon-Yang Station is on the south subtropic, montane type rain forest. On the other hand Ching-Tung Wu-Liong Shan is on the vertical distribution of vegetation. Ta-Mon-Lung Nature Conservation station is the one located on the west bank of the Lan-Tzeong-Kiang river on the border of Burma, about 50 Kilometers south of Yun-Ching-Hwung, the capital of the Tai peoples autonomous district, It is a large inter mountain river basin, about 600 meters above the sea level, the entire area of the basin is estimated 38 kilomtrs in length end only 2-3 kilometers in width. It is surounded by middle sized mountains, The seat of the Station is on the north side of the basin, from the ground level up to the mountains slopes, with the Hsiao-Ke-Ho river as its east border & Men-Chuon village on the west side. The mine vegtation type within the statin is the "Lung-Shan" forest of the Men-Yong-Kwang and Men-Leon-Suan of the Tai villages. In the classification of plant, communities this type of vegetation has been called the dry type of the seasonal rain forest. The first story trees of this type ofcommunity are Antiaris toxicaria and Gironniera subaequalis and many others, forming, very complex structures. On the base of the different local habitat of this plant community, it may be subdivided into: 1. community type on low terraces and lowslopes, 2. community type on eroded hill tops, 3. community type on slopes of mountain ravinas. Besides are monsoon type of forest communities and the evergreen oak forest communities on higher elevations above 800 m. in altitude, Between 700—800 m. in altitude above, the sea level is usuay a transtional zone with the tropical rain forest type below and the subtropical oak forest type above. Secondary vegetation types are various. There are young forest and shruby lianae combinations, vast areas of bmboo (Dendromus strictus) community, the Eupatorium odorum community, the different kinds of grass communities, and other aquatic types of communities. The Mon-Rung Nature Conservation Station is the second one to be mentioned in this specie. issue. It is located on latitude 21°41′ north and longitude 101°25′ east, to the east side of the Lan-Tzcong-Kiang River. The basin of Mon Rung is 540 m. above the sea level in altitude, with Loo-Soo-Kiang river flowng through its entire territory, and it is about the middle way of the Shiao-La-Highway. This nature conservatisn station is divided into two parts. The first part, situated near the highway, has sand shale rocks in nature. In mountain, ravines and low hills, vegetations are of the wet type of seasonal rain forest. It is also redivided into 3 eubtypes: 1. in narrow ravincs and on foot of slopes with the Pometia tomentosa as its dominant species in the first story; 2. in now ravin and on flat plas, with the Terminalia myriocarpa as its dominant species in its first story; 3. in narrow ravines and swampy places, with the Erythriua lithosperma as its dominant species in the first storg. Other types are the transitional ones of the south subtropial rain orest and the dry type of the south subtropical rain forest distributed on the higher part of the mountain slope, forming the vertical distribution of plant communities in this region. The second part of the nature conservation of Mon-Rung Station is a lime stone type, located on the upper part of the Loo-Soo-Kiang river, its baslc rock is made of permian lime stone. This type of seasonal raiu forest community has loosely spaced diciduous tall trees in the first story and very characteristic evergreen rain forest in the lower stories. and has poor undergrowth of the forest floor. It may be redivided into two other subtypes: 1 in narrow ravines with the Mallotus pseudoverticellata as the main dominant spocies in the second story of this tnpe of community. It has been found that the line stonetype of community is rich in species, and many new spocies, even new genera and new records are continuously discovered in recent years, some families have been reported to be new distributions in Chiua. The Mon-La Nature Conservation Station is on the east bank of the ran-Tzcong-Kiang River, the southern-most one among the five stations. It is located on th lower course of the Nan-La-Ho River, 640 m. above the sea level in altitude. All the natural forest land, on the low hills and terraces are included in this station. The main types of vegetation within this station in the wet type of the seasonal rain forest in which, Pometia tomentosa and Manglietia sp. are dominant spcies. This is in turn redivided into subtypes: 1. narrow ravine foot slope type of wet seasonal rain forest; 2. narrow ravine flat place type of wet seasonal rain forest; 3. narrow ravine swampy type of wet seasonal rain forest; 4. the Manglietia community type etc. Another type of vegetation within this territory is the sonth subtropical transitional rain forest which contains Alstonea pachycarpa and sovery species or Castanopsis as the first story trees, the under stories are rich in rain forest elements. On range tops of the lower mountains are commonly south subtropial dry ever-green oak forest, containing many species of the gencra Pasania and Castanopsis as dominant ones. The Mon-Yang Nature Conservation Station, is another one located on the east bank of the Lan-Tzcong-Kiang River, at 23°6~1-23°24~1 north latitudc, 100°-101° longitude east. The total area is estimated to bo 180 square kilometers, It is bordered on the west by Lan-Tzeong-Kiang River, on the east by thy Kun-Loo-Highway, on the south by the upper mountain ranges of the Mon-Yang-Ho River, and on the north by Mon-Men village. The highest mountain peak within this area reaches 1800 m. above the sea level, but most of the mountain ranges are below 1500 m. A so-called the south subtropial montane rain forest is. occurcd on back mountain slopes of the Kun-Men village distributed at 1200—1500 m. above the sea level. The main componints of this kind of forest community are the Calophyllum thorelii. Semecarpus albesccns. Vitex quinata, Reevesia siaminsis, and Dysoxylum haanensis etc. This knd of rain forest has occured comparatively on hghcr altitude in this place is a phenomeno quit different from other types of rain forest. The next eategory of vegetation is the tropical dry seasonal rain forest, distributel along terraces of stream sides about 720 m. above the sea level. It is a luxuriant rain forest rich in tropical species. The most conspicuous ones are: Pometia tomentosa, Daubanga grandiflora, Lagerstroemia intermidea, Cryptocarya caesia and Hrpultia cupanoides etc. The most common type of vegetation occupying most of the areas in the south subtropical region in the evergreen oak lorest. Common trees of this community are the species of the genera: Castanopsis, Pasania, Cyclobalanopsis, and Annaslea fragrans, Schima Wallichii etc. Among. the secondary vegetations, Dendrocalamus strietus is one of the most prominent type occupying vast areas. There are also vast areas of grass communitis, containing tall grasses like Themda giganta, Thysanolaena maxima, Neyrandia arundinacea, Microstegium vagans and mddle grasses: Imperatus eylindrica and Arundinella hirta etc; they togcther form different kinds of pure and mixed communities. The fifth and the last nature conservation station is the Ching-Tung, Wu-Lion-Shan Station. It is located at 24°29′3″ latitude north, 101°4′5″ longitude east. The highest mountain peak within this area is 3200 m. above the sea leval. It is a large mountain with the total area of the station estimated (to be) 180 square kilometers, stepwalled slopes and narrow deep anyans, with distinct vertical vegetational distributions. River bed and basins in Lan-Tzeong-Kiang, Pa-Pien-Kiang and Chuan-Ho are pro vided with the pine and oak forest community, dorainanted by Pinus yunnanensis, and Quercus alicna, Q. acutissima, Q. variabilis. Others like Kcteleeria evulyniana, Annaslea ragrans Myrica esculata, Rhododendron Delavayi are also not uncommon. Isolato large trees in this areas are Gossampinus malabaricus, Mallotus phillipinensis, Wendlandia paniculata etc. Secondty, there are the evergreen oak forest type and the subtropical rain forest, mainly occupy in the mountain ravines and valleys. It is one of the largest plant communitis within this station, estimated to had 5045 hectare in area. It contains different community types as follows: 1. Castanopsis hystrix-Cyphotha montana community. 2. Siima waihii+Illicium yunnannsis-Shinatala chinensis+Indoclamus pedolis community. 3. Manglietia forrosti+Acer pictum-Justicia petentiira commity. 4. Anus npalensis+Hartia yunnanenis Shinatala chinensi+Cyphtha montana community. 5. Hyna trijaga-Cyathea spinulosa community. Third one is hemlock forest distributed on the upper part of the mauntain about 2400-2800 m. above the sea level It is subdivided into hemlock pure forest and Tsuga-Rhoodendron communities. Tsuga yunnannsis is the. dominant species, othrs like Tsnga chinensis and Tsuga forrestii and many spies of Rhodendron are also there. The coniferous epiphytic moss forest type is a spial featrue among the plant communities. Mountain top moss Rhododendron forest and shrubs, are distributed at 2800-3100 m. above the sa level. The layer of moss is as thick as 10-20 cm. and completlely covering the tree surface especially the tree trunks. Moss Rhodldcndron shruby community are dominated by many spies of Rhodedendrom, Lyonia, Enkianths, Picris, Eurya and Vaccininm etc. Secondary vegetion are of varions forms, such as grassland, with Arundinella and Pteridium aquinum as dominant species; shruby comunitics with Cletyra delavayi, Gaultheria forrstii as common species; Alnus nepalensis and Jugans eathayonis are rather two pure forest stands. A small pond is formed t 2600 m. above the sea level, densely vegstated by Scirpus macronata, Eleocharis palustris, carex dispalata and other species of the families Cyperaceae and ca. Finally a dingram for the vertieal distribution of types of plant communities of the Wu-Lion-Shan mountain has been prepared to show the differences between the oast and west slopes. In this special issu the authors wish to amphasize their point of view in the science of vegetation as follows: (A) An attcpt to bring out a preliminary syem of classifieation of the tropical plant communities Ⅰ. Seasonal rain forest type-A cmbination of the nature of tropical rain forest and monsoon forest, distributed below 00 m. in atitude above the sea level. 1. Dry seasonal rain forest type-on terras and Knolls surrounding the intermountain basing. Charaetristic largo trees in this plant community are Antiaris toxicaris and Carnarium abum This is again redivided into three subtypes, depeuding of their loal habitats. (1) Flat terraces dry seasonal rain forest with Plonemia lenzeana as it dominant of the ground cover. (2) On the knoll tope dry seasonal rain forest type With Geophila hebacea as dominant of the ground cover. (3) On slopes near by the ravines dry seasonal rain forest type with Selaginella pieta as dominant of the ground cover. 2. Wet seasonal rain forest type inside the ravines and narrow mountain streams. Dominant arge trees are Terminalia myrioarpa and Erythrina lithosperma etc. This is also redividd into 4 subtypes as fallows. 1) On foot of slopes inside the narrow ravines, wet seasonal rain forest type. 2) Flat bottom land inside the narrow ravines, wet seasonal rain forest type. 3) Swampy land inside the narrow ravines, wet seasonal rain forest type. 4) Local manglietia pure stand, wet seasonal rain forest type. 3. Lime stone seasonal rain forest type. Distributed on lime stone mountains and castal lands. Dominant large tree speceis are Pterospermum lanciofolium, Ulmus laneiofolia, Mallotus pseudovertieellata snd Gironniera nitida, etc. 1) Ledge of narrow ravines type. 2) Flat sloping type. First stry trees are deciduous large trees Colona sinica, Garuga floribunda, Celtis sp. and ulmus lanceofolia. etc. predominant tree in the second layer is the Gironiera nitida. Ⅱ. Tropical monsoon forest type. 1. River bed monsoon forcst is characterized by Gossampinus malabaricus. 2. Stream side monsoon forest is characteristic by Pterocarya tonkinensis and Salix araeostachya. 3. Flood-plain monsoon forest, is characteristic by shruby communities Homonia riparia as the dominant species, one of the successional stages. Ⅲ. Transitional south subtropic rain forest type (Usually distributed as a narrow strip on the middle part of the mountain slopes.) Their top layers are evergreen oaks, sublayers are characterized by rain forest structures. Ⅳ. suth subtropical montanc rain forest. Diatributed on higher elevations. 1300—1500 m. in altitude above the sea level. Dominant trees are Dysoxylon hainanenae and Calophyllum thrllii. V. Soutlr subtiopic evergen oak forest type distribution in general on evations above 800 m. in altidde above the sea level. 1. Dry oak forest type oecupies vast areas over this region. Dominated by evergreea oaks, Schima Wallichii, and Annaslea fragrana etc. 2. Wet oak forest type occupies crtain part with better moisture condition. dominant species are usually with more Lauraceae elenets. (B) Another concept to be mintioned in this special issue is the special featuere of the epiphytie moss: coniferous forest type at Wu-Liang than, Ching-Lung Station. We assume that the Tsuga yunnanensis pure forest community is originated from the north stretching southwardly to the Ching-Lung, Wu-Liang than region. It is. thought be the most souther end of the Tsuga forest community coming over the 250 latitude north, one of the nearest points toward the Eustor. On the other hand, the, tropical and subtropical piphytic moss forsts. One of the southern elements, are, common in Hainan Island and many plaoes in Yunnan. Naturally, the epiphytic moss forest is a kind of ever-green broad-leaf forest type but not coniferous type as we thonght before. The epiphytic moss forest is combined with the Tsuga eniferous forest forming & special feature at Wu-Liang than. This is a new disovery by the students of Yunman University. This now fcature has two scientific significances: (1) a new combination of plant community (2) discovry of a new florestic distribution. This scientific achievenent is apparently due to our socialist educational policy and our correct sicentific direction.

本專号包括五个自然保护区的植被調查报告,其中大勐籠、勐崙、勐臘及勐养等四个自然保护区在西双版納境內,景东无量山自然保护区在景东境內,五个自然保护区都排列在瀾滄江兩岸分佈在北緯21°—25°之間。西双板納位於云南南部,北緯21°—22°30′,东經99°55′—101°15′。全区皆为海拔540—1000公尺的盆地和低山中山,个别山峯达1800公尺。面积約25000平方公里,瀾滄江縱貫其間,一片熱帶亞热帶的风光,是一个可爱的祖国边疆。本区气候炎熱湿潤,沒有明显的四季,只有明显的乾季和雨季(或乾季、雨季、霧季三季)。年降水量1000—1800公厘。年平均温度都在18℃以上。景东无量山,受干热河谷热带气候的影响,基本上与西双版納地区相似,具有大型高山特点。在大地構造上,位于中越地台西部的横断山块断带,紅河大断裂与康滇台背斜分开,及燕山运动对本区有着巨大的影响,其基底組成,由元古代昆阳系之千枚岩、板岩和石英大理岩構成;盖层以三迭紀陆相紅色砂頁岩广泛复盖其上,厚度不下于500公尺。本区山脈走向,均是西北东南向,由西北逐漸向东南降低。澜滄水系和盆地也具有与山脈走向相一致的情况。地貌的发育是严格受着地壳構造,近代地壳运动及...

本專号包括五个自然保护区的植被調查报告,其中大勐籠、勐崙、勐臘及勐养等四个自然保护区在西双版納境內,景东无量山自然保护区在景东境內,五个自然保护区都排列在瀾滄江兩岸分佈在北緯21°—25°之間。西双板納位於云南南部,北緯21°—22°30′,东經99°55′—101°15′。全区皆为海拔540—1000公尺的盆地和低山中山,个别山峯达1800公尺。面积約25000平方公里,瀾滄江縱貫其間,一片熱帶亞热帶的风光,是一个可爱的祖国边疆。本区气候炎熱湿潤,沒有明显的四季,只有明显的乾季和雨季(或乾季、雨季、霧季三季)。年降水量1000—1800公厘。年平均温度都在18℃以上。景东无量山,受干热河谷热带气候的影响,基本上与西双版納地区相似,具有大型高山特点。在大地構造上,位于中越地台西部的横断山块断带,紅河大断裂与康滇台背斜分开,及燕山运动对本区有着巨大的影响,其基底組成,由元古代昆阳系之千枚岩、板岩和石英大理岩構成;盖层以三迭紀陆相紅色砂頁岩广泛复盖其上,厚度不下于500公尺。本区山脈走向,均是西北东南向,由西北逐漸向东南降低。澜滄水系和盆地也具有与山脈走向相一致的情况。地貌的发育是严格受着地壳構造,近代地壳运动及不等量上升和热带亞热带的各种外引力相互作用之结果,形成各种不同的地形形态,具有热带亞热带丰富的植被类型。本專号的五个自然保护区中,在大勐籠方面以乾性季节性雨林为中心,勐崙方面以石灰岩季节性雨林为中心,在勐臘方面以湿性季节性雨林为中心,在勐养方面以南亞热带山地雨林为中心,在景东无量山方面以垂直分佈带为中心,前三者結合此較紧密,后兩者皆單独論述,与其他自然保护区沒有联带关系。大勐籠自然保护区却在大勐籠地区,位于允景洪西南方約50公里处,是瀾滄江西岸一个較大的山間盆地之一,壩区海拔600公尺,南北長达38公里,东西平均寬兩公里,四周为10′30、50—60公尺高度不等的阶地,多巳为近代溝谷切割,环繞壩区的低山相对高度200公尺上下。大猛籠自然保护区,位于壩区的北面山坡上,上以山脊为界,下以壩区边緣为界,东至小街河,西至曼庄村。以小街为中心、以曼养光、曼涼傘的龙山森林为主要对象而划定的。保护区中以热帶乾性季节性雨林为主要类型,有箭毒木(Antiaris toxicaria)、大叶白顏树(Gironniera subaegualis)等极其复杂的种羣所組成,依其分佈局部地形特点及林下草被层变化特点又可分为三种亞类:①低平阶地类型,②殘丘上部类型,③近沼地坡地类型等,其次是南亞热带乾性常綠櫟树,以壳斗科为主的羣落类型。分佈在800公尺以上的垂直帶类型,在700—8000公尺之間形成一个热带、亞热带植被交錯分佈的过渡帶,不仅兩个类型交錯,嵌鑲分佈,而且种羣层片之間互相交錯。次生植被中以牡竹(Dendrocalamus strictus)羣落、佔据較大的分佈面积,其他还有藤灌羣落(Liauae and shruby community)、鉄刀木羣落(Cassia siamea community)、飞机草 羣落(Eupatorium odosatum community)等为普遍分佈的羣落类型。勐崙自然保护区位於北緯21°41′,东經101°25′。在瀾滄江东岸,支流罗梭江下游,勐崙壩区海拔540公尺,界于勐养与猛臘之間,正当小臘公路中段(58—65公里处)。自然保护区分兩大片,一为小臘公路側一段溝谷和低山,母質为砂頁岩。以湿性季节性雨林为主要类型,可分三个亞类:①狹谷坡脚类型,上层以番龙眼(Pometia tomentoca)为主;②狹谷平地类型,上层以干果欖仁树(Terminalia myriocarpa)为主;③狹谷沼地类型,上层以石果刺桐(Erythrina lithosperma)为主。还有过渡性南亞热带雨林,和南亞热帶乾性常綠櫟林等,分佈在較高的山坡上,成为垂直分佈带植被类型。另一大片自然保护区在石灰山区,位于罗梭江及其支流的上游,母質为二迭纪石灰岩。以石灰山季节性雨林为主要植被类型,上层散生落叶大乔木,中层常綠性強,郁闭性最大,下层贫乏。又可分为兩个类型:①狹谷坡脚类型,中层以假輪叶野桐(Mallotus pseudoverticellata)为主。②平緩坡面类型,中层以光叶白顏树(Gironniera nitida)为主。本保护区的特点是植被类型多(包括原生的和次生的)其中以石灰山植被最为特殊,组成种类中新种新屬新分佈繼續发現。勐臘自然保护区位于西双版納东南角的边緣上,紧靠勐崙自然保护区的南面,在澜滄江的东岸,支流南臘河的中下流。壩区海拔640公尺,沿河兩岸的丘陵和低山植被,保存最良好的地段,就是自然保护区所在。保护区內以湿性季节性雨林为主要植被类型,分佈面积最大,保留也良好,其中最常見的是番龙眼(Pometia tomentosa)为主的狹谷坡脚类型,局部地段見有以木蓮(Manglietia sp.)为优势。狹谷平地的类型的雨林,一般可分为四个亞类:①狭谷坡底湿性季节性雨林类型,②狹谷平地湿性季节性雨林类型,③狭谷沼地湿性季节性雨林类型,④木蓮(Manglietia sp.)羣落类型等。此外自然区內还有过渡型南亞热带雨林,上层以厚果鴨脚木(Alstonea pachyearpa)、錐栗(Castanopsis spp.)为主,下层多雨林成分。在保护区低山的山脊部分,普遍分佈南亞热帶乾性常綠櫟林,以柯屬(Pasania)和錐栗屬(Castanopsis)若干种为优势。井傘困滿(勐养)自然保护区,位於瀾滄江的东岸,紧靠江边,約当北緯23°6′—23°24′和东經100—101°的地方。面积估計約为180平方公里,西界瀾滄江边,东界昆洛公路,南界勐养河以北的山脊,北界勐满至大渡崗一线。自然保护区以內的海拔最高点达1800公尺,一般的山嶺都在1500公尺以下。本区的植被类型以南亞热帶山地雨林为主要对象,主要分佈在困满背后,海拔1200—1500公尺的山坡上。該羣落组成主要种类有:小叶海棠(Calophyllum thorelii)、單叶漆(semecarpus albescens)、布刺(Vitex guinata)、暹罗利未花(Reevesia siamensis)、海南葱臭木(Dysoxylum haianensis)等,具有丰富的雨林結構。它分佈在这样高海拔的山上是局部温度和湿度造成。一般在这样的海拔高度上,应该是屬于南亞热带常綠櫟林的范圍了。比较次要的是热帶乾性季节性雨林类型,分佈在局部河灣阶地上,海拔720公尺的地方,主要組成种类有:番龙眼(Pometia tomentosa)、八宝树(Daubanga grandiflora)、西南紫薇(Lagerstrocmia intermedia)、桂皮(Cryptocarya caesia),还有Horputtia.cupanoides 等丰富的植物种类。保护区內佔面积最大的是南亞热帶常綠櫟林,主要組成种类有,錐林屬(Castanopsis)、柯屬(Pasania)、青杠屬(Cyelobalanopsis)等屬多种植物及桉納树(Annaslea fragrans),西南木荷(Schima wallichii)等組成。次生植被中竹林佔面积亦大,以牡竹(Dendrocaeamus stsictus),为主要种类。次生的草本植物羣落类型較多,其中最主要的种类有:大管草(Themeda gigantea)、白茅草(Imperata cylindrica),棕叶蘆(Tnysanolaena maxima)、类蘆(Neyrandti arundinacea)、野古草(Arundinella hirta)及馬鹿草(Microstegium vagans)等,分别組成單优、多优、高草、中等等不同类型草本羣落。动物比較珍貴稀有的:野象羣,各种犀鳥、大斑鳩、孔雀、野牛及华南虎。其他普通种类甚多。景东无量山自然保护区位於北緯24°29′30″,东經101°4′15″,面积估計180平方公里,海拔最高点3200公尺,当地相对高度2100公尺应屬大型高山类型,山峯峻峭,山谷峽深,植被垂直分佈明显,羣落类型复杂,最主要者有下列各类。河谷壩区乾旱性植被类型,分佈在瀾滄江把边江,者干江及川河谷等河壩区上,主要为松櫟林羣落單位,以云南松(Pinus yunnanensis)为主,与多种壳斗科植物混生如:槲櫟(Quorens aliena)、麻櫟(Q.acutisama)、全皮櫟(Q.variabilis)等。油杉(Keteleeria Evulyniana)、安納树(Annasloa fragrans)、楊梅(Myrica、esculata)、馬櫻花(Rhododendron Delavayi)等亦常混生其中。尚有散生树木有:木棉(Gossampinus malabaricus),菲島桐(Mallotus phillpinensis),水錦树(Uendlandia panioulata)等。亞热带溝谷雨林,常綠闊叶林类型,主要分佈在溝谷中,为自然保护区最优势的羣落类型,估計佔面积5045公頃之多,其中包括以下几个羣落类型。 (1)椎櫟(Caotanopsis hystrix)——山腫藥(Cyphotheca montana)羣落; (2)西南木荷(Shima wallichii)十滇八角(Illicium yunnanensis)——滑竹(Shinatala chinensis)十小金竹(Indocalomus podolcis)羣落; (3)木蓮(Manglietia torrestii)十五角楓(Acerpictum)——牛克膝(Tustieia petntifera)羣落。 (4)旱冬瓜(Alnus nepalcnsis)十云南黑德木(Hartia yunnanensis)——滑竹(Shin atals chinensis)十山腫藥(Cyphothea montana)羣落。 (5)海木(Heynea trijuga)——桫欏(Cyathea spinulosa)羣落。鉄杉针叶林羣落,分佈在海拔2400—2900公尺的亞高山帶,可分鉄杉純林(苔蘚針叶乔木林),以云南鉄杉(Tsuga yunnanensis)为主,中国鉄杉(Tsuga chinensis)次之,福氏鉄衫(Tsuga forrestii)最少。及鉄衫(TSuga)——杜鵑(Rhododendron)林,其中杜鵑种类甚多。高山苔蘚杜鵑林和杜鵑灌叢,分佈在海拔2800—3100公尺,山的頂部,地面上,树身上都有极发达的苔蘚,厚10—20公分以上。 (1)苔蘚杜鵑林羣落,主要种类有:杜鵑屬(Rhododendron)20—30种之多,南燭屬 (Lyonia)、吊鍾花屬(Enkianthus)、馬醉木屬(Pilris)、柃木屬(Eunya)等屬多种植物组成。 (2)杜鵑灌叢羣落,由多种杜鵑植物組成,另有假馬醉木(Picris formosa)、米飯花(Vaccinium donianum)等。次生植被类型包括多种多样的羣落單位,如草地羣落主要种类有:关公草(Arundinella)蕨菜(Pteridium aquilium)等。灌叢羣落中有山柳(Elethra delavayi)、杜鵑、南燭、米飯花、香白珠(Gaultheria focrestii)等,次生乔木林羣落中有旱冬瓜(Alnus nepalensis)林、野胡极(Juglans cathaynsis)林。在海拔2600公尺处,有一山間死水塘,全部为沙草种植物Scirpus macronata、E1eocharis、Carex dispulata等所充塞。最后附有景东无量山植被垂直分佈图一幅,东坡面临川河河谷,相对潮湿,共有17个羣落單位,西坡面临瀾滄江河谷,相对乾燥,共有10个羣落單位。在本專号中,作者們提出了一些学术性間題如下:划分羣落类型系統,羣落类型分佈,植物区系等方面分述于下: (A)我們对热帶植被类型提出的一个初步分类系統如: 一、季节性雨林类型——具有热带雨株及季雨林混合特点。 (1)乾性

 
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