试论旅游景观生态设计的基本原则

从旅游持续发展的角度，提出旅游景观生态设计的基本原则：①异质性原则；②多样性原则；③边缘效应的原则；④尺度适宜性原则。     

有序样品聚类的差异序列法

本文借助于两个样品的差异度和有序样品的差异序列两个概念，提出了有序样品聚类的差异序列法法。聚类数和分割点可以容易地由差异法获得。对某些无序样品，也可以应用差异序列法。三个例子说明，差异序列法是简单、有效的。     

九连山自然保护区山茶科植物多样性特点分析

通过对九连山自然保护区山茶科植物资源的调查研究,结果表明保护区内共有8属32种,占江西省本科植物37.2%,种类丰富,成分多样,优势现象明显。同时,该保护区山茶科植物中有些类群具有分布生境多样、较强的适应性的特点。九连山自然保护区山茶科植物属的地理成分可划分为4个分布型和2个变型,热带、亚热带分布类型占保护区山茶科植物属的87.5%,中国特有属1种,说明该区植物区系热带、亚热带性质显著,同时有一定的古老性。     

西藏色季拉山野生花卉植物资源的研究

西藏色季拉山区有丰富野生花卉植物资源,具有较高的开发利用价值,是西藏花卉资源最丰富的地区之一。该文在广泛深入地调查、采集、整理和鉴定的基础上,研究了色季拉山花卉资源的多样性性质。该区有较高观赏价值的花卉达79科161属340余种,具有种类丰富,名花众多;花色结构和花期呈多样性;植物区系成分复杂,特有植物多;垂直分布明显;形态各异,色彩绚丽等特点。根据本区野生花卉植物资源的种类、区系成分和特征、开发和保护现状,对本区野生花卉植物资源的开发利用进行了探讨,旨在为其选育与开发利用提供理论依据。     

Nakagami衰落信道中STBC码的性能估计

基于Alamouti提出的BPSK调制下空时分组码在Rayleigh衰落信道中的码性能原理,推导出高阶调制方式下Nakagami衰落信道中空时分组码的符号差错率的最小距离球界,仿真分析了两信道下引入空时分组码的多天线系统中发射和接收天线分集增益,发射天线数量的“地板效应”．     

A Pluralistic Approach to Interactional Expertise

The concept of interactional expertise – characterized by sociologists Harry Collins and Robert Evans as the ability to speak the language of a discipline without the corresponding ability to practice – can serve as a powerful way of breaking down expert/non-expert dichotomies and providing a role for new voices in specialist communities. However, in spite of the vast uptake of this concept and its potential to fruitfully address many important issues related to scientific expertise, there has been surprisingly little critical analysis of it. We seek to remedy this situation by considering potential benefits of interactional expertise and the ways in which the current conception can – and cannot – realize those benefits. In particular, we argue that interactional expertise hasn't reached its full potential for addressing who ought to be involved in scientific research and decision-making, largely owing to an unnecessarily restrictive way of operationalizing the concept. In its place, we offer a broader, more pluralistic account of interactional expertise – one that is in line with the original spirit of the concept, but also captures the diversity that we see as being an important aspect of interactional experts and the value they can bring to the table.     

Corals and reefs of Cosmoledo and Aldabra atolls: Extent of damage,assemblage shifts and recovery following the severe mortality of 1998

An updated list of over 200 species of corals from Cosmoledo and Aldabra atolls is presented, which more than doubles previously known species diversity, and establishes these atolls as amongst the most species-rich in the Western Indian Ocean. However, partly this is an artefact of a new method of recording with digital cameras, described here, which greatly improves recording efficiency. This is the first underwater study of Cosmoledo, and the first for Aldabra outside the expedition reports cited. The survey extended to >30 m depth, and comes after the 1998 massive coral mortality. Coral cover was virtually eliminated at that time to about 8-10 m depth in Cosmoledo on seaward slopes, below which coral mortality was only about 50%. Mortality was selective regarding different species, genera and families. Cosmoledo's lagoon of >150 km² is shallower than the 'critical depth' of 8-10 m, resulting in an almost complete elimination of corals. To compare these atolls with other reefs in the region, critical depths are summarized for over 25 Indian Ocean locations. New coral recruits are abundant in the shallows of Cosmoledo and Aldabra 4 years later, though cover remains very low. Much bare rock remains (with turf algae) and some genera such as Acropora, previously apparently abundant, remain relatively very scarce. Apart from Porites, whose higher survival is now well documented, the best survivors from the 1998 mortality, and the most successful recruitment of new corals, are of faviids. Soft corals remain extremely scarce in all locations examined above the 'critical depth'. It is predicted that there may be a shift in the identity of the main species of corals in these atolls for many years.     

中国生物多样性非原生境保护问题与对策研究

生物多样性非原生境保护是原生境保护之外的重要途径。国际立法与实践已经明确了非原生境保护必要性与紧迫性。我国受威物种形势严峻,非原生境保护面临着场所较少、资金缺乏等问题。在分析我国非原生境保护现状及问题的基础上,提出了加强非原生境保护的几点对策。     

椒江河口生态环境质量评价

根据2003年8月调查资料,对椒江河口的生态环境质量进行评价.结果表明:椒江河口水体的DIN、DIP、Hg、Pb、DO、COD等6项属重污染,水体富营养化指数0.67～1237,均值288;表层沉积物的单项标准指数均小于1;河口水域底栖生物种类6种,多样性指数H'为0～1.92;潮间带共鉴定大型潮间带生物38种,H'为1.03～2.40之间,种类多样性差,丰度低,个体分布不均匀,生态环境脆弱.     

内蒙古不同地区根茎冰草过氧化物酶同工酶比较研究

应用聚丙烯酰胺凝胶电泳的方法，对内蒙古境内东部，中部不同地理分布区的7个居群的根茎冰草（Agropyron michnoi Roshev)苗期过氧化物酶同工酶进行分析。结果表明：不同居群的根茎冰草地的过氧化物酶同工酶谱极为相似，说明同工酶酶谱与不同地理分布区没有十分密切的对应关系；然而，个别水分较充足的居群，其酶带数目较少，表明其同工酶酶谱的变化与水分条件相关联，呈现出一定的多样性。