共查询到20条相似文献，搜索用时 62 毫秒
1.
倪志诚 《中国科学院研究生院学报》1991,29(1):84-85
Caragana sajaensis Ni (Leguminosae)is described from Xizang, China, asnew. 相似文献
2.
孙维 《内蒙古科技与经济》2012,(2):101-104
本文对栽种于库布齐沙漠东段的岩黄芪属3个栽培种(羊柴Hedysarum Futicosum var.lignosum,花棒H.scoparium,山竹子H.fruticosum)和锦鸡儿属3个栽培种(小叶锦鸡儿Caragana microphylla,中间锦鸡儿C.intermedia,柠条锦鸡儿C.korshinskii)的光合作用及蒸腾作用进行了比较研究.结果表明:①岩黄芪属山竹子具有较强的光合能力,花棒有较强的抗旱能力,光合作用强弱顺序为花棒＞山竹子＞羊柴;锦鸡儿属小叶锦鸡儿在光合能力和抗旱能力方面都较强.光合作用强弱顺序为小叶锦鸡儿＞柠条锦鸡儿＞中间锦鸡儿.岩黄芪属三种植物的光合速率要高于锦鸡儿属的三种植物.②岩黄芪属三种植物的蒸腾强弱顺序为羊柴＞花棒＞山竹子;锦鸡儿属的三种植物的蒸腾强弱顺序为小叶锦鸡儿＞柠条锦鸡儿＞中间锦鸡儿.岩黄芪属植物的蒸腾强度大于锦鸡儿属植物的蒸腾强度.③岩黄芪属水分利用效率顺序为羊柴＞花棒＞山竹子;锦鸡儿属水分利用效率顺序为柠条锦鸡儿＞小叶锦鸡儿＞中间锦鸡儿.锦鸡儿属植物的水分利用效率显著低于岩黄芪属植物.④在生物量方面,岩黄芪属植物显著高于锦鸡儿属植物.锦鸡儿属3种植物3a之内生长缓慢,生物量较低,水分利用效率较低,防风固沙作用较弱,在风沙活动强烈、严重缺水的干旱地区在短期内的生态经济价值较低;而岩黄芪属3种植物生长速度较快,栽种后2a即可获得很大生物量,且水分利用效率较高,抗风蚀作用强,有机积累量大,短期内可获得较高的生态经济价值. 相似文献
3.
张明理 《中国科学院研究生院学报》1997,35(2):136-147
锦鸡儿属Caragana是一个典型的温带亚洲分布属。本属在青藏高原和喜马拉雅约有24种1变种，约占整个属的1／3。这些种类几乎全部处于演化高级阶段，且既有叶轴宿存类群，也有假掌状叶类群。反映出种的分化很活跃，在横断山地区形成本属的分布中心、分化中心。本区内绝大多数种类是特有分布。替代现象主要受气候、植被变化作用，沿横断山和喜马拉雅分布的长齿系Ser. Bracteolatae Kom．是一个典型的替代分布类群。锦鸡儿属植物生态适应性很强，可在其生长的灌丛中形成优势种。 寒化和旱化现象十分突出，它们有一系列森林种、草原种和荒漠种及相关的形态变异。用锦鸡儿属植物进行青藏高原和喜马拉雅区域内的分布区关系分析及最小生成树MST和特有性简约性分析(PAE)，表明横断山地区特别是其北部是本属植物的一个地理结点。以此沿横断山向北部唐古特和西部藏东南适应性辐射。横断山和西喜马拉雅联系微弱，看不出植物长距离扩散的踪迹，大多是由于生态因子限制而产生的隔离。虽然本区不可能是锦鸡儿属的起源地，然而，通过本区与邻近地区的地理联系，可推测它们在我国适应性辐射方向是从东北向西南。结合豆科蝶形花亚科其它属化石记录及其分布区局限在温带亚洲等现象，认为锦鸡儿植物是一组特化、晚近衍生的类群，起源于北方东西伯利亚晚第三纪中新世后期至上新世。 相似文献
4.
柠条锦鸣儿是优良的沙生植物．也是鄂尔多斯沙区的主要建群植物种。为了挖掘其固定流沙、适应干旱、需瘠薄的物植品能．笔者根据我年的造林固沙实践经验，调查研究了宁条鸡儿地上枝条与花果的生物量投资结构及时空分布．为柠条鸡儿的数字造林提供基础数据。 相似文献
5.
6.
报道了蔷薇科李亚科两个种的改隶新组合,将广义李属中的背毛樱Prunus hypotrichodes改隶为杏属中的背毛杏Armeniaca hypotrichides;疏花稠李Prunus laxiflora改隶为疏花樱Cerasus laxifiora。进一步研究的结果,同意前苏联学者G．V．Eremin et V．S．Simagin的意见,将稠李属中的种斑叶稠李Padus maackii改隶为樱属中的斑叶樱Cerasus maackii。 相似文献
7.
The present paper is an attempt to throw some light on two Composite genera,
Cavea W. W. Smith et Small and Nannoglottis Maxim., of which the generic features
and the systematic position were heretofore rather badly known.
Cavea, a monotypic genus based upon Saussurea salwinensis Drumm., was described
by W. W. Smith and Small as monocious. From the ample material now in our com-
mand, it is found that the genus is either monocious and dioecious, the capitula in the
latter case being homogamous. The individuals exclusively provided with sterile flowers
are usually smaller in size, sometimes even stemless. Such repartition of sexes was
known in the subtribe Plucheinae (tribe Inuleae), to which W. W. Smith and Small were
correct to ascribe their genus.
Nannoglottis was considered by Maximovicz as un abnormal genus of the tribe
Inuleae, having heterogamous capitula with one series of peripheric fertile ligulate pistil-
late flowers. Having examined the type specimen of N. carpesioices Maxim. and the ex-
tensive collection from Kansu and Tsinghai, we incline to say that the genetic characters
as discerned by Maximovicz are doubtlessly due to his inaccurate observation. The
flowers of Nannoglottis are in fact trimorphous, of which the pistillate ones are 2-3-
seriate, the outer being shortly ligulate and the inner, short-tubulate with truncate apex.
Handel-Mazzetti, much later, indicated that, in another species, the pistillate flowers are
2-3-seriate, but no mention was made about the inner tubulate pistillate flowers.
Franchet, appearing to be unware of Maximovicz's genus, founded his Stereosanthus
Franch. and considered it as a genus intermediate between the tribes Inuleae and Sene-
cioneae. The genus was misinterpreted by Franchet as having dimorphous flowers, the
pistillate ones being all ligulate. Curious enough, one of the major generic features, viz.,
the presence of inner tubulate pistillate flowers, was neglected by all early botanists and
was first recognized by Handel-Mazzetti fourty years later.
However, Handel-Mazzetti was still unacquainted with the characters of Nannoglot-
tis and proposed therefore his new genus Vierhapperia Hand.-Mzt. on the reason that the
flowers are trimorphous. Moreover, he compared his genus with Conyza L. and Erigeron
L. of the tribe Astereae, but the characters marked by him appear not to be different
from those of Nannoglottis.
From the above morphological comparaison, it is evident that Nannoglottis and two
other genera in question possess in common important characters in the general appea-
rance, the flower-forms and the structure of achenes and pappus. The differences in the
disposition of involucral bracts and the length of ligules are criteria good for separating
species, but can hardly be regarded as sufficient for generic delimitation. Moreover,
these three genera are almost similar in their geographical distribution. These points are
adequate to warrant that Stereosanthus and Vierhapperia are in reality congeneric with
Nannoglottis.
Nannoglottis appears to have been correctly placed by Hoffmann in the subtribe
Senecioninae (tribe Senecioneae) though in that subtribe it finds no close relatives. On
account of the outstanding characters of the genus, a further study of its systematic posi-
tion is required.
The present paper is brought to close by a tentative scheme of classification of the
genus so amplified, of which two sections, namely, sect. Stenolepis Ling et Y. L. Chen
(Stereosanthus Franch., p. p. min.) and sect. Nannoglottis (Stereosanthus Franch., p. p.maxim.; Vierhapperia Hand.-Mzt.), altogether including 9 species, are being proposed. 相似文献
8.
毛乌素沙地荒漠草原狭叶锦鸡儿-小针茅群落地上生物量对气候因子的动态响应 总被引：1，自引：0，他引：1
对毛乌素沙地荒漠草原围封样地狭叶锦鸡儿 小针茅群落地上生物量进行了 7年逐月连续观测,建立了生物量对气候响应的逐月回归模型。研究表明,光、温、水等不同的气候因子在植物生长不同时期表现出不同的影响,其中降水因子在生长季各个月份都是显著影响因子,说明水分的限制作用突出。应用逐月回归模型对三种不同气候条件下生物量的波动范围进行预测,并将逐月回归模型与传统的累积回归模型的模拟结果进行比较,表明在大多数年份逐月回归模型具有更高的精度。逐月回归模型是对传统的累积回归建模方法的有益改进。 相似文献
9.
10.
12.
eterachopsis was proposed by the senior author as an independent genus of
the family Aspleniaceae in 1940 with 2 species. Since then much study on its morpho-
logy, anatomy, gametophyte and palynology has been carried out by Nayar, Bir, Chan-
dra & Nayar and Chang et al., and they are of the opinion that the genus like Ceterach,
is a comparatively primitive element in the family Aspleniaceae. The queer zigzag pa-
tern of cutting of lanceolate fronds appears extraordinary in the family Aspleniaceae,
and also suggests its antiquity in evolution. So far only 3 species (C. dalhousiae, C.
paucivenosa and C. magnifica) are recognized, the former from W. Himalayas, also
known from Africa, while the latter two from W. S. China (Yunnan). However, in
the past forty years the Chinese botanists have discovered 2 more species as new in N.
W. Yunnan, thus bringing the total known species of the genus up to 5. The present
paper is a brief summary on the genus Ceterachopsis, which will be published in detail
in the Flora Sinica vol. 4.
Pteridologists are also divided in their views regarding the generic status of Cete-
rachopsis with 5 well-defined species in Yunnan and the East Himalayas. We prefer
to mintain it as a genus separate from Asplenium on account of its distinct morpholo-
gical features. It is to be hoped that more species may come to light in the mountainsin N. W. Yunnan through further exploration now under way. 相似文献
13.
14.
乌蒙杓兰及其近亲种 总被引：1，自引：0，他引：1
陈心启 《中国科学院研究生院学报》1985,23(5):369-375
In addition to describing a new species, Cypripedium wumengense, as well
as a new variety, C. bardolphianum var. zhongdianense, nomenclatural and taxonomic
notes are made on its allies and the division to which they belong. They are ltrge]y
found in the Hengduan Mountains in southwestern China, characterized by the absence
of bract, havirg lip more or less covered with small wart-like outgrowths, and that as
the capsule matures the scape becomes much elongated. Six species of this group have
hitherto been reported, of which, however, C. ebracteatum and C. nutans are regarded
here as conspecific with C. fargesii and C. bardolphianum respectively. Thus, including
the new taxa described here, it composes five species and one variety: C. bardolphianum
W. W. Sm. et Farrer (var. bardolphianum and var. zhongdianense S. C. Chen), C. mic-
ranthum Franch., C. fargesii Franch., C. margaritaceum Franch. and C. wumengense
S. C. Chen. They are all grouped here into the same section, Sect. Trigonopedium
(Franch.) Pfitz., the oldest legitimate name of this group in the rank of section. 相似文献
15.
16.
库尔班·尼扎木丁 《中国科学院研究生院学报》1984,22(6):466-468
The karyotypes of 3 species of Ceratoides (C. arborescens, C. ewersman-
niana and C. latens) were studied. The results show that C. arborescens is a diploid,
with karyotype formula 2n=2x=18=16m+2sm, C. ewersmanniana is also a diploid, with
2n=2x=18=14m+4sm, while C. latens is a tetraploid, with 2n=4x=36=24m+12sm. Ac-
cording to the karyotypes, the morphological features and geographical distribution, C.
arborescens seems to be a primitive species and it might have originated in northern
China. C. arborescens and C. ewersmanniana are similar to each other, not only in mor-
phology but also in karyotype, which shows that they are closely related and that C. ar-
borescens might be the progenitor of C. ewersmanniana. The karyotypes of the 3 speciesof Ceratoides are basically identical, with only minor differences. 相似文献
17.
In order to get a thorough understanding of the Characeae, the specime-
ns collected from Guangxi and Gansu were identified. The result shows that the
two provinces, especially Guangxi, are abundant in this family. In this paper, ho-
wever, reported are only new species, new varieties and new records of Chara in China.
They are Chara vernicosa sp. nov. C. globularis var. inflata var. nov. and C. howe-ana var. subgymnophylla var. nov., C. brionica stapf and C. calveraensis comb. nov. 相似文献
18.
One new species Coloniophora shanxiensis Y. J. Ling et S. L. Xie, is described,and one new record, C. spicata (Schmid.) Islam, is reported both from shanxi, China. 相似文献
19.
20.