赵连芳

赵连芳,字兰屏.中国水稻遗传育种研究的先驱者.1894年4月2日,出生在河南省罗山县张跃区赵家岗.1907年,考入河南省罗山县高等小学就读.他不仅勤奋好学,每考必名列前茅;并以忧国忧民的思想,加入了同盟会.1911年,他投笔从戎,参加武昌革命军江西援鄂军.翌年,被选入江西陆军讲武堂擢升将校班.1913年,他弃武从文,进入武昌私立英算专科学校主修英文.翌年,考入英人创办的武昌博文书院,为尔后赴国外留学,研习农科,报效祖国,继续苦渎.1917年,他考入北京大学英文系,旋即转考进入清华学堂理科攻读.     

Helicotylenchus vulgaris Yuen, 1964 (Nematoda: Hoplolaimidae): A new record for New Zealand

Abstract

Helicotylenchus vulgaris Yuen, 1964 was extracted in large numbers from soil around grass roots in an ap ple orchard at Kurow, North Otago. This is the first time the species is recorded in New Zealand. The material is described and illustrated.     

Proharpoceras Chao: a new ammonoid lineage surviving the end-Permian mass extinction

Based on new, bed-rock controlled material from northwestern Guangxi and Oman, the Early Triassic genus Proharpoceras Chao is shown to be a representative of Otocerataceae. Character analysis excludes a direct link with the Griesbachian Otoceratidae and favours a derivation of Proharpoceras from the late Permian Anderssonoceratidae. The biostratigraphic range of Proharpoceras is restricted to the Smithian and its biogeographic distribution comprises Oman, South China, and Primorye, thus indicating an essentially low palaeolatitudinal distribution. Proharpoceras has no apparent relatives among other Early and Middle Triassic Ceratitida and is thus considered to be the last representative of Otocerataceae. This offshoot of the late Permian Anderssonoceratidae implies that an additional ammonoid lineage survived the end Permian extinction and that it dwindled away for some 2 Myr before going extinct.     

Some Results on the Tukey-Mclaughlin and Yuen Methods for Trimmed Means when Distributions are Skewed

In applied work, distributions are often highly skewed with heavy tails, and this can have disastrous consequences in terms of power when comparing groups based on means. One solution to this problem in the one-sample case is to use the TUKEY and MCLAUGHLIN (1963) method for trimmed means, while in the two-group case YUEN's (1974) method can be used. Published simulations indicate that they yield accurate confidence intervals when distributions are symmetric. Using a Cornish-Fisher expansion, this paper extends these results by describing general circumstances under which methods based on trimmed means can be expected to give more accurate confidence intervals than those based on means. The results cover both symmetric and asymmetric distributions. Simulations are also used to illustrate the accuracy of confidence intervals using trimmed means versus means.     

蜀柏毒蛾生物学特性及防治

1990～1991年,作者在四川平昌县对蜀柏毒蛾生物学特性及防治进行了调查研究。结果如下：蜀柏毒蛾在四川1年发生2代,以幼虫越冬;常年以越冬代的5、6龄幼虫危害较重,危害盛期从5月上旬至6月上旬,林间高温干旱气候和天敌种类及数量的锐减是导致蜀柏毒蛾猖獗的主要因素;提出以科学营林增加灭敌种类和数量的营林防治和生物防治为主的综合防治措施。     

悼念赵修复教授

我国著名昆虫学家、蜻蜓和蜂类分类专家、昆虫分类学报编委、中国人民政治协商会议福建省委员会原副主席、中国民主同盟福建省委员会名誉主任委员、福建农林大学博士研究生导师赵修复教授因病医治无效 ,于 2 0 0 1年 5月 2日 1 3时 1 0分在福州逝世 ,享年 85岁。赵修复教授 1 91 7年 5月 1 7日出生于福州市。1 935年就读于燕京大学生物系 ,1 939年 8月毕业后任济南齐鲁大学生物系助教。1 941年 9月任福建省泉州培英女子中学教师。1 942年 2月任福州协和大学生物系助教、讲师。1 948年 8月赴美国麻萨诸塞州立大学昆虫系攻读硕士、博士研究生…     

汉森安春蜓(Amphigomphus hansoni Chao)的雌性记述(蜻蜓目:春蜓科)

首次记述汉森安春蜓（Amphigomphus hansoni Chao,1954）的雌性,标本存放于漳州教育学院生物标本室。     

Estimation of river ecosystem biodiversity based on the Chao estimator

The research was focused on identification of plant diversity assessment approach which would be suitable for flowing waters. Moreover, the study attempted to estimate the extent of the survey (sampling effort) needed for detection of full plant diversity in river ecosystems. The analysed data were collected in a botanical survey carried out on the lowland sandy bottom Wel river, which is a very common river type in Europe. The Chao method of estimation of total species richness of macrophytes and Hill numbers were used to estimate the diversity based on very common plants (inverse Simpson index) as well as frequent species (Shannon index) and also including rare species (species richness). The analysis showed that using standard macrophyte survey approach for rivers, it is relatively easy to record abundant plants, but it is not possible to detect all species, because many aquatic macrophytes occur with low frequency and abundance requiring enormous sampling effort to detect all of them. It exceeds capabilities of most scientific projects. To improve the accuracy of diversity estimation, the rarefaction and extrapolation method was recommended. This method can reduce the bias in diversity estimates based on limited observational data, and thus limit inaccurate conclusions and subsequent wrong decisions in the conservation frameworks related to freshwater protection.     

北京市白河和潮河流域生态健康评价

选取北京市重要的饮用水源密云水库上游白河和潮河流域,结合北京山区流域生态现状,构建了涵盖水域生境结构、水生生物、生态压力和陆域生态格局与功能、生态压力5大类13项指标的评价指标体系,开展了流域生态健康评价。结果表明白河和潮河流域的健康状态整体处于良好等级,但水生生物和陆域生态格局状况相对较差。14个子流域的健康状况差异并不显著,琉璃河、白河下段、汤河上游的健康状况相对较好,潮河中下段和小汤河的健康状况相对较差。流域内不合理的畜禽养殖、岸边带种植及民俗旅游是导致流域生态健康退化的主要原因,建议加强污染负荷排放的控制和监管涉水活动对水生生境的干扰以改善流域健康状况,并重点关注可指示水生态系统早期退化的生物指数,以实现可持续性和适应性的流域管理,保障密云水库的水生态安全。