拟鹅观草属6种2亚种和鹅观草属3种植物的核型研究

对拟鹅观草属Pseudoroegneria 6种2亚种和鹅观草属Roegneria 3种植物的核型进行了研究,核型公式如下：P. spicata (Pursh) A. Lve，2n=2x=14=12m (2sat)+2sm; P. strigosa ssp. aegilopoides (Drobov) A. Lve，2n=2x=14=12m (2sat)+2sm; P. libanotica (Hackel) A. Lve，2n=2x=14=10m+4sm (4sat); P. stipifolia     

分支系统学和种系发生种

 A brief review is given on problems of species conceps in cladistics and evolutionary sys- tematics, and some advances in the study on species problem are introduced. Particularly Nixon and Wheeler's phylogenetic species concept and two procedures of delimitating phylogenetic species— Davis and Nixon's population aggregation analysis and Brower's cladistic haplotype aggregation arereviewed in detail.     

中国梧桐科二新种和粗齿梭罗的补充记载

描述了国产梧桐科植物2新种,并对梭罗属的粗齿梭罗作了花的补充描述。     

基于生物勘探的遗传资源物种多样性价值评估

通过生物勘探活动获得的资源价值是生物多样性价值的主要表现形式之一。本文通过理论建模,对遗传资源物种多样性潜在价值（选择价值）的评估方法进行了探索,并通过数值模拟,尝试性地评估了全中国和案例区高等植物物种多样性的遗传价值。结果显示,中国高等植物具有较高的潜在价值: 边际物种价值为人民币3531万元,潜在总价值约为11 825亿元;以一个面积确定的案例区为例,得到武夷山国家级自然保护区的边际栖息地价值约为6444元/hm²。本文通过修正既有主要模型和参数赋值方法,构建新的潜在价值评估的理论模型和参数,为国内开展遗传资源物种多样性选择价值评估提供了一个全新的方法补充,即基于生物勘探的价值评估。通过数值模拟所形成的研究结论对于未来将遗传资源的潜在价值纳入保护政策制订、引导保护投资、促进生物遗传资源的有效保护和利用具有重要的现实意义。     

三种耧斗菜属植物柱头的特征

为了深入了解植物捕获花粉的机制和生殖策略，我们对3种耧斗菜属Aquilegia L.植物华北耧斗菜A. yabeana Kitagawa、无距耧斗菜A. ecalcarata Maxim.和秦岭耧斗菜A. incurvata P. K. Hsiao的雌蕊进行了扫描电镜和荧光显微镜观察,发现其柱头发育的特殊式样。其柱头位于花柱的腹缝面,由花柱腹缝两侧细胞发育成柱头乳突,在花期中从顶端朝花柱基部渐次成熟。伴随花柱向外弯曲,成熟的柱头表面相继呈现,逐渐增加了花粉落置的空间。这种柱头发育的式样通过延长柱头的可授期,增加了植物在不可预测的传粉环境下的繁殖机会。     

11个四倍体赖草属物种的核型研究

对11个四倍体赖草属Leymus Hochst.物种的核型进行了研究，核型公式如下：沙生赖草L. arenarius (L.) Hochst., 2n=4x=28=18m+4sm+6st (4sat); 密穗赖草L. condensatus (J. Presl) A. Lve, 2n=4x=28=22m+4sm (2sat)+2st (2sat); 新生赖草L. innovatus (Beal) Pilg., 2n=4x=28=24m (4sat) +4sm (2sat);多枝赖草L. multicau     

西藏沿阶草属一新种

There are eleven species of Satyrium hitherto reported in China, among which, after a detailed examination of herbarium specimens consisting of about 300 plants, only four forms, represented by S. nepalense D. Don, S. ciliatum Ldl., S. setchuenicum Kranzl. and S. yunnanense Rolfe, are susceptible of division. S. nepalense is a wides- pread species with its main distribution centre in indian region, whereas the other three, with which the present paper deals, are largely distributed in our country.       S. ciliatum is characterized by its pink flowers with spurs about half as long as the ovary.  It is usually found in mountain meadows at an altitude between 1900- 4100m. from Szechuan through Kweichow, Yunnan  and  Tibet,  southwestward  to Sikkim and Bhutan. In all its flowers examined, both female and male organs are perfect and many have produced capsules. It is, no doubt, the hermaphrodite form as seen in the ordinary orchids.       S. setchuenicum closely resembles S. ciliatum in habit, distinguished mainly by having flowers without or with short spurs.  These two forms are sympatric.  In our herbarium, for instance, they are sometimes found on a same specimen or the different sheets with the same field number, such as Y. Tsiang 11454, R. C. Ching 24184, T. P. Wang 9497, etc.  A detailed comparison shows that in S. setchuenicum the anther and pollinia are abortive or even entirely absent, and the stigma is larger than  the rostellum which usually partly thickens and becomes some-what stigma-like, while in S. ciliatum the male organ is well developed, and the thin rostellum is larger. Between these two forms several intermediates are found. It is quite certain that they are dif- ferent sexual forms belonging to one and the same species, and so called S. setchuenic- um is but a female form of S. ciliatum.      Another sympatric form is S. yunnanense, characterized by its yellow flowers with somewhat horizontally extended spurs.  Its anther, pollinia and rostellum are very similar to those of hermaphrodite form of S. ciliatum, but the ovary is narrower and the stigma is usually smaller.  It is interesting to note that in all specimens examined consisting of 36 individuals, no fruit can be found, while in those of S. ciliatum, includ- ing both female and hermaphrodite forms, the lower flowers of the racemes are mostly found to have produced fine seed-capsules. From  these  facts we  may confidently regard this species as the male form of S. ciliatum.      Thus, we have three separate sexual forms in S. ciliatum, to which eight specific names previously recorded in China are here referred. Detailed discussion and descrip- tion as well as a key to the chinese species are given as above. Its geographical distribu- tion is mapped.  The flowers of these three forms are illustrated.  All the specimens cited here, with a few exceptions, are deposited in the herbarium of Institute of Botany,Academia Siaica.     

New plant species brought to light in Sichuan

A new species of the wild orchids was recently discovered and identified by an expeditionary team of Chinese and US botanists when sorting out the specimens collected from a wildlife survey conducted in 2004 in Sichuan Province.     

披碱草属(Elymus L.)两个物种之订正

披碱草属Elymus L．是小麦族Triticeae Dumort．中最大的属，全世界共有150多个种，广泛分布于   温带地区。我国约有80余种(包括鹅观草属Roegneria C．Koch)，是披碱草属的重要分布区和多样性分   化中心。由于披碱草属植物种类繁多、分布广泛、生境多样以及形态变异较为复杂，导致该属在分类上   存在许多问题。同时，由于地域的局限和地区间交流的缺乏，致使同一种披碱草属植物被不同的学者多   次发表及同物异名现象的出现。本文对E．antiquus和E．burchan-buddae这两个曾多次被订名的披碱草  属物种进行了分类订正。     

藏中矿区植物种群生态位特征研究

研究藏中矿区植物种群生态位特征和演替状况,对恢复矿区生态环境、提高草地生产力具有重要意义。本文采用样方法对以藏中矿区的3种群落为研究对象,对样地的植物种群进行系统调查,并计算其主要植物的重要值、生态位宽度和生态位重叠值。结果表明:每一群落类型优势种非常明显,并且具有较高的生态位宽度和生态位重叠。高寒矿区各植物优势种群与其它种群之间竞争激烈,群落结构极不稳定,群落可能正处于正向演替和逆向演替的拐点。     

金缕梅科一些种类的新异名

 作为对英文版《Flora of China》金缕梅科的分类学修订结果,本文提出了10个新异名,其中蕈树属Altingia Noronha、金缕梅属Hamamelis Linn．、红花荷属Rhodoleia Champ．各一个新异名,蚊母树属Distylium Sieb．et Zucc．3个新异名,半枫荷属Semiliquidambar Chang 4个新异名,并分别进行了讨论。