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On biological karst
Studies have shown that stromatolites are a comprehensive structure formed by cyanobacteria themselves and their life activity relics. Therefore, the study of cave stromatolites should belong to the category of biological karst.

Wang Fuxing et al. (1993) mentioned: "The effect of organisms on carbonate (calcium) has long been noticed. It has been mentioned that the "fungal infection" and "depression" on the wall of stone houses are deeper than those on the wall ... The detailed study of modern biological karst began from the end of 19 to the beginning of the 20 th century. " Cohn et al. (1862) combined biogenic sedimentary karst landscape with plants for research. Sollas( 1880) thinks that the pits on the surface of limestone are caused by the erosion of limestone by lichens.

Scholl and Taft( 1964) studied the spring bloom in Mono Lake, California, USA, and found that there were many filamentous and spherical cyanobacteria in it, which formed the scaffold of the spring bloom structure, and thought that its formation was related to cyanobacteria. Jones (1965) observed the dissolution trace on the surface of limestone in Yorkshire, England, and thought it was formed by biological action under soil cover. Neumann( 1968) put forward the term "costal nucleus" and the importance of biological function in its formation.

.................. ……Folk et al. (197 1, 1973) ................................................................................................................................. golubic et al. (1977) think that the biological deposition and dissolution of calcium carbonate depend on the characteristics of organisms and the influence of microenvironment conditions. Schneider (1976, 1977) studied the biological and abiotic factors of limestone coast destruction, and put forward the term "biological karst" for the first time. ...

There are several characteristics in the research of biological karst in 1980s: First, the research on the deposition and dissolution of biological karst continues to be deeper, wider and more detailed … Second, the scanning electron microscope is used more in the research methods … Third, some summary and comprehensive papers on biological karst research have been published on the basis of previous studies … Fourth, the research on biological karst continues to develop into caves in dark environment; The main products that are considered to be biological karst deposits in caves are moonstone, pillar-shaped stone dam, iron-manganese oxide, gypsum and so on. The organisms related to the formation of these sediments are mainly bacteria; Fifthly, the biological karst morphology is studied quantitatively. ...

"In China, the observation and preliminary study of biological karst phenomenon began in the early 1980s. Deng (1982) discussed the influence of vegetation on karst development from the perspectives of hydrochemistry and geology. Qian Kaixian and Zhu Haoran (1982) analyzed and studied its ecological characteristics ... coastal calcareous algae ... Zhu Dehao (1986), Zhu (1990) and Yuan Daoxian (1989) also reported some surface organisms. Chea Chang (199 1) studied the relationship between lichen and karst development from the perspective of biological karst for the first time in China. An Yuguo et al. (199 1) published the research results of biogenesis of dripping sediments in Dajidong, Zhijin, Guizhou. Starting from 1990, the author studied the biological karst deposition and dissolution in southern China ... ". [32]

An Yuguo and others put forward: "1987+65438 February, the author visited Zhijin Cave and observed that stalagmites, stalactites and stone pillars in the cave have different shapes and grow strangely ... from micro to macro, they are all regular. It is found that they are formed by the growth and reproduction of algae ... This view is different from the previous view ... ".

Above, Wang Fuxing and others introduced the research situation of biological karst at home and abroad in detail. Its report mainly focuses on the drilling and erosion of carbonate rocks by organisms (bacteria and algae), and the influence and function of organisms (bacteria and algae) on the formation of carbonate cave sediments. As far as the types of sediments are concerned, they are mainly aimed at moonstone, pillar of edge stone dam, iron-manganese oxide, gypsum and so on. As far as sedimentary environment is concerned, it is mainly aimed at the light or weak light zone of karst caves.

An Yuguo et al. ([3 1]) clearly put forward and studied the biological deposition mechanism of travertine in karst caves, which used to be inorganic chemical deposition. But also mainly aimed at the role and influence of organisms in the dark and dim zone of caves on their formation mechanism.