一类孤立子系统的无穷守恒律及其精确解

通过一个谱问题得到了一类孤子族方程:包括广义TD(k=1),TD(k=1,α=0),广义C-KdV(k=0)与C-KdV(k=0,α=0)等,进而利用Riccati方程及相容条件得到了此类孤子方程的无穷多个守恒量及其连带流。并且针对特定的非线性发展方程,给出了其精确的孤子解及椭圆函数解。     

历史文化名城阆中的可持续发展与保护

对阆中古城的自然人文特色和历史文化价值作了剖析，提出在经济与社会迅速发展的条件下，古城的保护应符合可持续发展的要求，并提出要实现古城的可持续发展必须以古城的历史文化为依托，发展文化经济。     

祁连山森林健康保护与恢复策略

应用森林健康理论，分析得出威胁祁连山森林健康的主要自然灾害为病虫鼠害、雪折、风倒滑坡、气候干旱及森林组成和林分结构不合理；主要人为破坏活动为过度放牧、毁林开荒、乱砍滥樵、乱采道挖、乱捕滥猎等．提出了保护和恢复祁连山森林健康的策略：全程计划、加强预防、严格封锁、严密监测、科学防治、合理利用、大力建设、广泛合作．针对祁连山北坡森林类型，提出了相应的健康维护的技术措施．     

Specialist and generalist species in habitat use: implications for conservation assessment in snakes

Habitat specialization is recorded as one of the central factors that make species vulnerable to extinction. Among snakes, there is considerable variation in this trait, as some species are specialists and others are generalists in habitat use. We have quantified habitat specialization in the snakes of the southern Iberian Peninsula, and compared it with their abundance and IUCN categories. All data were combined for a principal components analysis that discriminated two main groups: three generalist species that live in all types of habitat, and five specialist species that ranged from rather scarce to extremely rare and are found only in unaltered habitats. The three generalist snakes are not threatened and their IUCN category is Least Concern. Three out of the five specialist species are categorized as Near Threatened, Vulnerable, and Endangered at regional or national levels. The other two species are currently considered Not Threatened and we discuss whether they are incorrectly classified. The conservation status of snakes is difficult to evaluate because of their secretive habits and low population densities. We suggest that quantifying habitat specialization may be a useful tool for assessing the conservation status of secretive organisms such as snakes.     

The amphibians and reptiles of Nosy Be (NW Madagascar) and nearby islands: a case study of diversity and conservation of an insular fauna

Surveys of the amphibians and reptiles on Nosy Be (an island off north-west Madagascar) and nearby islands were undertaken between 1991 and 2001 and are discussed here in view of biodiversity considerations and conservation efforts. Since Nosy Be is the type locality of several amphibian and reptile taxa, their exact status is of crucial importance for the nomenclatural stability of many groups of the Madagascan herpetofauna. A total of 20 amphibian and 61 reptile species (excluding marine reptiles) was confirmed for this archipelago. Other species (Mantidactylus horridus, Androngo elongatus, Typhlops madagascariensis, T. reuteri, Micropisthodon ochraceus and Pararhadinea melanogaster) were not found during these inventories, but are quoted in the literature or housed in herpetological collections, and are considered as likely to be present at Nosy Be. A further 18 taxa are tentatively excluded from its fauna, due to biogeographic incongruence and/or lack of reliable voucher specimens. Few taxa are so far only known from the island; they may represent endemics or may have been overlooked on the adjacent mainland. They are respectively Stumpffia pygmaea, Mabuya lavarambo, Lygodactylus h. heterurus, Lycodryas granuliceps and Typhlops reuteri. Heterixalus tricolor too is likely to be present on Nosy Be only, but the difference with respect to taxa present on the mainland needs to be confirmed. Several species are known from nearby islands and islets surveyed (11 amphibians and 26 reptiles). A few of them (Heterixalus 'variabilis', Kinixys belliana, Furcifer oustaleti, Mabuya comorensis, Paracontias milloti) are present on some of these islands but have not yet been found on Nosy Be. Much of the field research was conducted at Lokobe, a strict nature reserve still characterized by good forest coverage (typical of the Sambirano Domain), and an important area of biodiversity. With 15 amphibian and 45 reptile species, Lokobe hosts 81% of the overall Nosy Be herpetofauna: of the species found during our surveys, only Heterixalus tricolor, Hoplobatrachus tigerinus, Gehyra mutilata, Phelsuma dubia and Crocodylus niloticus were only found outside the reserve. In view of this, the protection of Lokobe should be assured and reinforced. Except for Lokobe, habitats on Nosy Be are largely anthropogenic, and have a lower species diversity, especially where there is intensive agriculture. At other sites (e.g. ylang-ylang and coffee plantations) and in forested bands along roads, species diversity is still high: careful management of these anthropogenic habitats might also assure the survivorship and conservation of a diverse herpetofauna outside the protected area.     

一类用于定常计算的Runge──Kutta型TVD时间离散

讨论了一类用于常计算的Ｒｕｎｇｅ－Ｋｕｔｔａ型ＴＶＤ时间离散，并给出了它们的ＴＶＤ条件．     

浅水运动方程的初等波解

浅水运动方程是2×2—阶拟线性双曲守恒律方程组。本文讨论了该方程组的初等波,即激波与疏散波,论证了它们怎样满足一些基本性质,从而得到了该方程组的黎曼问题的初等波解。     

内乡宝天曼自然保护区蝶类名录

根据1982—1987年的调查,本名录记载内乡宝天曼自然保护区的蝶类160种,隶属于10科92属。其中1科46种为河南省新记录。计斑蝶科1科1种,凤蝶科2种,粉蝶科4种,眼蝶科9种,蛱蝶科10种,蚬蝶科1种,灰蝶料9种,弄蝶科10种。     

英国奔宁山区喀斯特土地资源的开发利用与保护(以约克夏地区为例)

约克夏地区的冰川喀斯特代表了英国奔宁山区喀斯特景现的基本特征。喀斯特景观价值的多样性和土地地产权的多属性决定了土地的多功能、开发的多目的和利用的多层次。因此,以牛羊为主的畜牧业用地、石灰石为主的采矿用地以及用于科研、教学、探险和旅游目的的保护用地在约克夏国家公园内有机地融为一体,形成了奔宁山区独特的土地资源开发、利用与保护形式。     

发展方程(组)对称和守恒律的扩展

首先,对发展方程（组）匹配共轭方程（组）,从而得到扩展方程组和Lagrangian函数;其次,利用吴方法推出扩展方程组的全部对称（其中包括扩展对称）;最终,利用N ether定理产生（扩展）守恒律.