Regeneration and tree species diversity of Sitakund Botanical Garden and Eco-park,Chittagong, Bangladesh

Anthropogenic disturbances influence plant regeneration and species diversity, which impact the conservation status of protected areas. A study was conducted in the Sitakund Botanical Garden and Eco-park （SBGE）, Chittagong, Bangladesh to analyze the natural regeneration and tree species diversity in disturbed and less disturbed zones. Stratified and systematic random sampling was used to select 50 sample plots from each of the two zones. A total number of 109 plant species from 43 families were recorded in the study; of which 93 species were of natural origin while the rest were planted. From the species with natural origin 66 were tree species, 9 were shrub species and 28 were climbers. Species richness, density of regeneration and disturbance index in the height classes （0- 0.5 m） and {dbh 〉 6 cm） indicated significant differences between the zones. The study analyzed how disturbances affect species diversity in the area. It was found that species richness and basal area are negatively related with disturbances. Moreover, density （N/ha） of trees was more likely to decrease with increasing tree height that reflects the huge demand of local people to harvest large trees as part of their income generating activities. The study findings have implications for future managementdecisions of the SGBE. To restore these ecosystems, management should focus on both biodiversity eonservation and providing benefits to local people without hampering forest ecosystems.     

神秘的红色亿元村——南街村

在河南省临颖县,有一个美丽而又神奇的村子,这里不但有壮观的朝阳门、美丽的金水桥、神秘的一步二石三眼井、雄伟高大的毛泽东塑像;而且还有神奇的植物园、动物园、宝塔寺,风景宜人的假山、花园等,它就是享誉国内外的美丽乡村——南街村。     

全美物候观测计划为气候变化研究提供证据

UCAR、芝加哥植物园（Chicago Botanic Garden）等单位与美国国家物候网（USA National Phenology Network）、美国国家生态观测网（National Ecological Observatory Network）共同组织发起了一个全美物候观测计划（BudBurst计划），资金来源于美国鱼类和野生动物局（U．S．Fishand Wildlife Service）、