Tiankeng group discovered in Guangxi

Recently, a large-scale Tiankeng group was found in the southwest border of Guangxi when the Institute of karst geology of China Geological Survey of the Ministry of natural resources and Chinese and foreign experts carried out the survey of karst geological relics in Southwest China. The Tiankeng group consists of 19 tiankengs, which are mainly distributed in Chengxiang town and Longhe township of Napo County. It is another world-class Tiankeng group found in China after Dashiwei Tiankeng group and Hanzhong Tiankeng group. These tiankengs have a volume of more than one million cubic meters and are well preserved. They are of high value for scientific research and tourism development.
According to the survey, Napo Tiankeng group was formed in Dingye underground river basin, with a catchment area of 486 square kilometers, a total length of 60 kilometers and a drop of 292 meters. Some of these tiankengs are developed on the plateau with an altitude of more than 1000 meters, and some of them are distributed like beads along the track of the underground river. The discovery of the Tiankeng group in Napo is of great scientific value to improve the theory of Tiankeng evolution. In addition to Tiankeng group, there are many types of karst geological relics in Dingye underground river basin, especially rich and colorful karst caves, karst canyons, Fuliu and waterfall landscapes.
Napo Tiankeng group has well preserved original vegetation communities, such as Dong palm, Ophiopogon japonicus, reptile, Manglietia, palm trees, etc., among which Dong palm community of national second-class protected plants is more than 30 meters high, such a tall wild Dong palm forest in Tiankeng is the first discovery in China; the height of Xiang manglieshu in the center of Tiankeng is 50 meters, next to that in Dashiwei Tiankeng.
Napo County, located in the southwest border of Guangxi, is one of the main channels to ASEAN trade area in Guangxi and even the whole country, and also one of the four extremely poor counties in Guangxi. The Tiankeng group and many karst geological relic landscapes discovered by the Institute of karst geology of China Geological Survey are of great significance for Napo County to develop the border geological tourism economy and achieve accurate poverty alleviation.
This survey is an integral part of the implementation of the international big scientific plan of “global karst dynamic system resources and environmental effects”. The international organization for standardization karst Technical Committee officially settled in the Institute of karst geology in September this year. The major findings of the Guangxi natural landscape resources survey will further enrich and expand the samples for formulating relevant international standards for karst.