The geomorphologic features called tiankengs were first discovered and named at the end of the twentieth century in karst areas of China. They have enjoyed increasing attention owing to their unusual geologic processes and unique ecological communities. However, the understanding of classification, geomorphic evolution, developmental conditions, geological dating and ecological environments of tiankengs are still extensively disputed by geomorphologists and geologists. This article focuses on combining all main areas of recent research activities from three aspects: development, evolution and transformation of karst tiankengs; biodiversity of karst tiankeng forests; and the impact of human activities on karst tiankeng ecosystems. Finally, we suggest future direction for research on karst tiankeng ecosystems: (1) multidisciplinary systematic study; (2) processes of ecological change and environmental effects under the influence of both natural and human impacts; (3) research on their protection, rational utilization, and sustainable management.

Research Progress on Karst Tiankeng Ecosystems

[Objective]To investigate the medicinal fern resources of Dryopteridaceae in Dashiwei Tiankeng Group. [Method]Through field investigation,sample collection,data reference and sample identification,the medicinal fern resources of Dryopteridaceae in Dashiwei Tiankeng group were investigated,and their geographical distribution and medicinal value were introduced. [Result] Four genera of medicinal fern resources of Dryopteridaceae,which were Arachniodes Blume,Cyrtomium Presl,Dryopteris Adanson and Polystichum Roth,were found out in Dashiwei Tiankeng Group. Among the four genera,there were a total of 15 species: one species of Arachniodes Blume,which was Arachiodes assamica ( Kuhn) Ohwi; five species of Cyrtomium Presl,which were C. fortunei J. Sm,C. hookerianum ( Presl) C. Chr,C. caryotideum ( Wall. ex Hook. et Grev. ) Presl,C. balansae ( Chrit) C. Chr. and C. forunei J. Sm; five species of Dryopteris Adanson,which were Dryopteris fuscipes C. Chr, D. sieboldii ( van Hout. tEx M ett. ) O. Ktze. ,D. ryopteris varia ( L. ) O. Ktze,D. dickinsii ( Baker) C. Chr. and D. labordei ( Christ) Ching; four species of Polystichum Roth,which were Polystichum makinoi ( Tagawa) Tagawa,P. neolobatum Nakai,P. piceo-paleaceum Tagawa and P. m tsussimense ( Hook. ) J. Sm. According to their efficacy,those fern plants could be divided into several types,including the type of analgesia and clearing heat,the type of eliminating phlegm and relieving asthma,the type of detoxification and diuresis,the type of hemostasis,the type of dispelling parasites,the type of curing bone injury,the type of antivirus and antitumor,and the type of relieving convulsion,calming the liver,lowering blood pressure and relieving uneasiness. [Conclusion] The climatic and geographic conditions in Dashiwei Tiankeng Group were very suitable for the growth of fern plants,the fern resources were very rich and were important plant resources in west Guangxi Province,and the fern plant species in this area had high content of active components. Therefore,it was of great significance to protecting their biodiversity and realizing their sustainable utilization. The study provided references for the further research and analysis of medicinal and development values of Dryopteridaceae.

Investigation on the medicinal fern resources of Dryopteridaceae in Dashiwei Tiankeng Group.

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Investigation on the medicinal fern resources of Dryopteridaceae in Dashiwei Tiankeng Group.