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 >> Applied botany submitted time 2019-03-14 Cooperative journals: 《广西植物》
Abstract：城市化和工业活动造成了镉（Cd）、铊（Tl）等重金属的广泛污染，给生态系统功能和人类健康带来了一系列问题，因此，如何有效地治理Cd和Tl污染，是当前最迫切的环境问题之一。芦竹（Arundo donax）对多种重金属都有较好的耐受性，是植物修复技术较理想的选择，然而，关于芦竹对Cd和Tl胁迫生理反应的相关研究较少。因此本研究以芦竹为试验材料，通过添加不同浓度重金属Tl（4，10和20 mg·kg-1）、Cd（50，100和200 mg·kg-1）进行芦竹盆栽试验，测定芦竹的株高、分蘖数、叶绿素含量、光合生理指标以及Tl和Cd在芦竹中的累积量，探讨芦竹对Tl和Cd胁迫的响应机制。结果显示：Tl（4~20 mg·kg-1）和Cd（50~200 mg·kg-1）对芦竹株高、分蘖数以及叶绿素含量均无显著影响（P > 0.05）；芦竹体内Tl和Cd含量随着Tl和Cd浓度的升高呈上升趋势，芦竹体内Tl含量的分布规律为根>茎>叶，Cd含量的分布规律：Cd浓度50 mg·kg-1时为茎>叶>根，Cd浓度100和200 mg·kg-1时为根>茎>叶，表明Tl和Cd主要分布在根部，芦竹对Tl、Cd有一定的富集能力。Cd和Tl处理均显著降低芦竹叶片的胞间CO2浓度，在Tl浓度为10 mg·kg-1时，净光合速率、气孔导度和蒸腾速率得到显著提高，当Cd浓度为50 mg·kg-1时，净光合速率、气孔导度和蒸腾速率得到显著提高。研究表明，芦竹对重金属Cd和Tl有较强的耐受性，可为Cd和Tl污染土壤的治理和修复提供参考。
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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