首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 46 毫秒
1.
云南西双版纳片断热带雨林鼠形啮齿类的物种多样性研究   总被引:11,自引:1,他引:10  
本文以3个不同面积和环境状况的片断热带雨林即西双版纳傣族“龙山林”和1个自然保护区对照样地为工作样区,对热带雨林片断化后,鼠形啮齿类物种多样性的变化及其与环境的关系等进行了研究。结果如下:(1)4个样地铗捕获得的鼠琪啮齿类种数分别为3,4,4和5种,(2)城子龙山和保护区对照样地的多样性指数较高(分别为2.058和1.944)而曼养广龙山和曼俄龙山的物种多样性指数仅为1.165和1.350;(3)  相似文献   

2.
西双版纳部分地区鸟类多样性初步考察   总被引:9,自引:2,他引:7  
1992年12月,1993年11月及1994年4~5月,对西双版纳自然保护区内外的数个工作点进行了鸟类物种多样性的调查,共记录鸟类190种。分析表明雀形目鸟类物种多样性状态尚佳,而非雀形目鸟类类群(科种)多样性及物种多样性状态均恶化趋势,保护区内鸟类物种多样性状态明显较好,傣族墓葬地之龙山因依傍村落,农田及其他多种生境而具有相当丰富的鸟类物种多样性,是保护鸟类物种多样性不可忽视的一个方面,研究表明  相似文献   

3.
西双版纳片断季节性雨林蚂蚁物种多样性研究   总被引:18,自引:1,他引:17  
以西双版纳勐仑自然保护区为对照,采用陷井诱捕法和亲方调查法比较研究了3个不同面积、不同环境状况和片断季节性雨林蚂蚁的群落组成及物种多样性变化。结果表明:所获蚂蚁隶属4亚科24属50种,以城子龙山物种数量多。各样地优势种均不相同。4类样地间的共有物种较少,只有4种;相似性较低,相似性系 0.1622~0.3548。聚类结果显示,植物园保护区与城子龙山最先聚为一类,然后与自然保护区聚为一类,最后才与曼  相似文献   

4.
西双版纳片断热带雨林土壤动物组成的比较   总被引:16,自引:3,他引:13  
本文对西双版纳国家自然保护区勐仑片和城子,曼峨,曼养广傣族“龙山”4个热带雨林片断土壤动物群落组成及其季节性变动规律进行了比较研究。调查方法:在每片森林沿直角线路布设7个样点,每点取50cm×50cm面积的枯枝落叶及表层土,用于漏斗法收集土壤动物。干季和雨季各取样1人,统计单面积个体数理。  相似文献   

5.
西双版纳热带森林地区不同生境蜜蜂的物种多样性研究   总被引:9,自引:0,他引:9  
本文研究了西双版纳热带森林地区不同生境蜜蜂的物种多样性。共鉴定蜜蜂总科5科、22属、77种。8个生境的物种丰富度指数DMA的取值范围在1.914~7.877之间,多样性指数H′的范围是0.608~1.398,均匀度指数Jsw为0.716~0.956,其中保护区、雨林和灌丛拥有较高的物种丰富度指数和多样性指数,橡胶林的最小,而均匀度指数以曼养广龙山最大,农田最小。根据不同生境物种的相似性系数C进行系统聚类,8个生境在相似性系数0.169的水平时全部聚合在一起。傣族龙山在保持雨林的蜜蜂物种多样性中可以起一定的作用,但很有限,且当龙山面积越小,受人为干扰越严重时,物种多样性的损失就越大。雨林一旦被开垦为橡胶林或农田,雨林中原有的许多蜜蜂将会消失,物种多样性显著减少。  相似文献   

6.
1994—2014年,中蒙俄达乌尔国际保护区科研人员对克鲁伦河流域的鸟类开展了多次实地考察,共记录到鸟类18目52科288种,其中非雀形目鸟类17目30科166种,占鸟类总物种数的57.64%,为本地区鸟类主体。克鲁伦河流域的鸟类以夏候鸟(147种)和旅鸟(66种)为主,占本地区鸟类总物种数的73.70%。本地区鸟类以湿地鸟类为主,共192种,占鸟类总物种数的66.43%。另外草原鸟类主要由隼形目猛禽白头鹞Circus aeruginosus、白腹鹞Circus spilonotus等种类和雀形目鸟类组成。  相似文献   

7.
四川辖曼自然保护区是保护以黑颈鹤为主的珍禽和湿地生态系统的保护区,是黑颈鹤最集中的繁殖地。通过我们的调查和结合历史文献该区岛类区有81种。属国家及国际间保护的鸟类有49种,占60.5%,其中国家Ⅰ组保护岛类有7种,Ⅱ级有15种域鸟类较为丰富且数量较大。从区系上看,古北界成分占绝对优势的65种占80.2%,东洋界4种占4.9%,广布种11种占13.6%。该区鸟类区系是由更新世北方区动物九发展而来,从晚更新世经草原或森林--草原鸟类发展到至今的高原湿地鸟类。  相似文献   

8.
庞泉沟冠纹柳莺繁殖习性的观察   总被引:1,自引:0,他引:1  
冠纹柳莺(Phyloscopusreguloides)是庞泉沟保护区近几年来新发现的繁殖鸟类,从而使该区繁殖柳莺的种类增加为4种[1,2]。国内关于该种繁殖习性的报道尚少。为了系统搞清本区柳莺的生态资料,1993-1997年的4-9月,对该种的繁殖习...  相似文献   

9.
四川千佛山自然保护区的鸟类资源   总被引:6,自引:0,他引:6  
通过2002年10月和2003年5月对保护区鸟类的集中调查,结合历史文献,确认保护区有鸟类13目35科160种.其中国家I级保护鸟类2种,Ⅱ级保护鸟类19种,完全或主要分布于我国的鸟类种类20种.保护区鸟类以留鸟和夏候鸟为主,有留鸟91种,夏候鸟48种,而冬候鸟、旅鸟分别只有13种和8种.鸟类区系组成为:古北界种类有30种,东洋界种类90种,广布种19种,以东洋界种类占优势,同时兼具西南区和华中区的特点.保护区鸟类主要分布在阔叶林和灌丛生境,其次是针阔混交林生境.保护区内鸟类水平分布的情况和垂直分布的情况都差异明显.  相似文献   

10.
2010年1月至2012年12月采用样线法对化龙山国家级自然保护区鸟类进行了调查。结果表明,保护区有鸟类16目50科224种,占陕西省鸟类种数(475种)的47.16%和全国(1371种)的16.34%。其中,雀形目鸟类32科156种,占69.64%;非雀形目鸟类18科68种,占30.36%。留鸟123种,夏候鸟67种,旅鸟25种,冬候鸟8种,迷鸟1种。在本区繁殖的190种鸟类中,东洋界种100种,古北界种67种,广布种23种。从繁殖鸟的区系成分看,东洋界种与古北界种分别为100种和67种,比例为1.5∶1,东洋界种占优势。从生境分析看,鸟类主要分布于森地和灌草丛。  相似文献   

11.
12.
13.
14.
15.
Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.  相似文献   

16.
Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.  相似文献   

17.
18.
Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.  相似文献   

19.
正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases  相似文献   

20.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号