同龄纯林自然稀疏规律的研究

本文提出同龄纯林自(然)稀硫的理论方程式。这个方程式概括了各种不同立木度林分的自稀疏规律,由此方程式结合断面积生长模型可以导出不同初始密度林分的自然生长过程。熟知的完满立木度林分的自稀疏规律是本文所述方程式的特例。一个实例说明不同初始密度林分自然生长过程的计算方法及例证不同密度林分自稀疏规律的不同。     

湖南借母溪自然保护区两栖动物区系研究

报道了借母溪自然保护区两栖动物资源和区系特征的调查结果。已知有2目8科25种。广布种5种，古北界种1种，东洋界19种。进而进行区系分析和多样性分析。     

广西十万大山自然保护区外来入侵植物研究

十万大山属北热带山地,有着丰富的生物多样性,但目前已遭到外来种植物入侵。通过实地调查和查证文献资料,初步确定十万大山自然保护区内外来入侵植物有23种,隶属于12科21属,其中菊科种类最多,6种,占入侵植物总数的26.1%;其次为苋科,3种,占入侵植物的13.0%。从来源看,23种入侵植物中,有21种来自热带美洲,占入侵植物种的91.3%。23种入侵植物均为r-选择对策种,其中有草本20种,占入侵植物种类总数的87.0%。23种入侵植物几乎全部是由人类活动直接或间接引入。最后对保护区内入侵植物的危害性及防治措施也作了初步的分析。     

谈鹤北林业局重点天然林保护技术

本文介绍了鹤北林区森林资源现状 ,讨论了重点天然林类型的划分 ,提出了鹤北林区实现天然林保护的措施和方法。     

南方岩溶区植被自然演替恢复研究综述

我国岩溶区绝大部分分布在南方。植被的自然演替恢复是岩溶区生态重建的主要方式。随着自然演替的进行,土壤环境特征、土壤养分特征及土壤种子库等产生相应的变化。而岩溶植被的顶极群落特征和群落演替特征,包括盖度、结构、物种多样性、生物量、分布格局、演替方向都有其自身的特殊性。     

德钦县"天保"工程实施对策

德钦县地处“天保”工程实施的重点区域 ,工程的实施 ,可从根本上遏制该县生态环境日益恶化的趋势 ,改善区域内的生态环境 ,对经济和社会的可持续发展产生重要作用。为保证“天保”工程的顺利实施 ,提出加强技术培训和人才培养 ;实施林下资源和旅游资源开发 ;协调林牧矛盾 ;加大公益林建设力度等 8条实施对策     

Phenological patterns in a southern Amazonian tropical forest: implications for sustainable management

Phenological transects were employed to assess monthly leaf, flower, unripe fruit and ripe fruit abundance for a total of 1732 individual plants within five tropical forest habitats at the ‘Lago Caiman Research Camp’, Noel Kempff Mercado National Park, northeastern Santa Cruz Department, Bolivia. Fruit surveys along trails were conducted concomitantly to assess fruit availability for the resident terrestrial frugivore community. The results of the two methodologies are compared and discussed with respect to wildlife and forest management in the region. Phenological transects revealed that Cerrado forest, tall forest, low vine forest, Sartenejal (swamp) forest, and pied mont (premontane) forest, showed seasonal variations in flower, unripe fruit and ripe fruit abundance, however, the broad temporal patterns were significantly different across habitats. Seasonal variation in overall foliage abundance was only marked for Cerrado forest. Ripe fruit production within the study site was not significantly different across months, with different habitats peaking asynchronously in abundance. From a frugivory perspective, overall ripe fleshy fruit abundance also varied considerably between habitats, and again showed asynchronous peaks in habitat production. However, both methodologies revealed the early dry season (June–July) as a period of ripe fleshy fruit scarcity throughout the study area. This period represents a resource ‘bottleneck’ for the resident frugivore community and phenological results allowed the identification of a number of keystone fruit resources for the region. Furthermore, fruit resources which are super-abundant in the early–mid wet season (November–February) might also be considered keystone resources for the region, given that they are available in an otherwise fruit scarce forest. The dynamic spatial patterning of fruit availability at Lago Caiman suggests that certain habitats might be considered keystone habitats, since they provide the majority of fruit resources on a seasonal basis. Finally, the potential of phenological information in tropical forest management plans is discussed and underlined by the observation that rainfall in itself fails to predict fruit availability in the dominant habitats at Lago Caiman.     

Fruit tree Aphids and their natural enemies in Isparta region,Turkey

Fourteen aphid species belonging to eight genera and three families of the superfamily Aphidoidea were presented from Isparta region in fruit tree orchards. Among these, Dysaphis plantaginea, Aphis pomi and Dysaphis devecta, which cause harm to apples, are the most common species in the area because of the high amount of apple production. In addition, eight species from the family Coccinellidae (Coleoptera), three from Syrphidae (Diptera) and one species from Forficulidae (Dermaptera) were found as predator. Totally, eight species were determined as parasitoids from the families Aphidiidae, Aphelinidae and Pteromalidae (Hymenoptera).     

具有广阔发展前景的几种云南天然香料

叙述了云南省天然香料资源开发利用简况及生产现状，提出了发展香料产业区域布局的设想。重点论述了香荚兰、肉桂、薄荷的国内外生产动向及在云南的发展现状和前景。     

福建省自然保护区生态旅游现状分析与发展对策

本文阐述了福建省自然保护区所蕴藏的丰富的生态旅游资源，分析了其生态旅游的现状及存在的问题，在此基础上探讨了发展保护区生态旅游的对策。