Subjects: Biology >> Botany >> Applied botany submitted time 2021-04-13 Cooperative journals: 《广西植物》
Abstract： Karst Tiankengs are one type of negative topography that are of high value for conservation, providing habitats and breeding unique biological resources not found in the surrounding landscape. In recent years, the studies on karst Tiankeng in China has increased our understanding of diverse geological and ecological questions, from the formation and evolution of Tiankeng to species diversity. Based on a systematic review of the previous studies on karst Tiankeng, we reviewed the main advances and new findings, and addressed key topics for future studies. These key findings and topics include the distribution, evolution and vegetation ecology of Tiankeng. We also propose five key areas of focus for future studies: (1) the causes of Tiankeng formation and its vegetation ecology in systematicness, large scale and multidisciplinary collaboration; (2) the effect of biological resources in Tiankeng on ecological restoration of desertification area outside Tiankeng; (3) the distribution of soil microbial community and their interaction with plants in Tiankeng; (4) the impact of environmental change on karst Tiankeng ecosystem; (5) the assessment of the impact of tourism development on Tiankeng vegetation ecology.
Subjects: Biology >> Botany >> Botany research, experiment, plant evolution & development submitted time 2018-06-25 Cooperative journals: 《广西植物》
Abstract： Ecological floating bed system has been the hotspot of research and application in the comprehensive management of polluted water environment. In order to analyze the effects of its plant diversity and composition on purification of domestic sewage, this study established five species richness levels and two composition arrangements by using Arundo donax as dominant and constructive species, and measured the plant growth, system productivity and N, P, COD removal. The results indicated that the individual biomass and relative growth rate (RGR) of wetland plants (such as A. donax) decreased with increasing species richness, while the survival and growth of mesophytes were promoted. Higher species richness decreased the productivity of the system, but increased significantly the removal of N, P and COD. At the same level of species richness, the composition with more mesophytes had lower system productivity than that with more wetland plant species, but the former had higher N, P and COD removal. Under the same species richness and composition, P removal was highest, N removal was followed, and COD removal was lowest.
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