Corrosion effects and environmental correlation of bryophytes on limestone in Guiyang karst park

Bryophytes are important habitants in the karst area, and they are of great significance in biological geology and ecological geology to study the corrosion in karst area. The relationship among bryophyte diversity, dissolution forms and environmental factors was studied in Nanshilin, Guiyang kast park through field investigations and lab experiments, The results show that: 49 taxa in 27 genera of 14 families of bryophytes were identified in the study area. According to the morphology, the corrosion results could be divided into six types: corrosion hole, corrosion pit, corrosion cone, corrosion groove, corrosion trough and corrosion basin. The diversity index of bryophytes showed a tendency of rising first and then decreasing in the following three stages:corrosion hole-corrosion cone-corrosion pit-corrosion basin, corrosion groove- corrosion pit-corrosion basin and corrosion trough-corrosion pit-corrosion basin,of which the minimum indices of bryothytes diversity occurred in corrosion hole, corrosion cone and corrosion groove being 6.232, 8.524, and 7.490, respectively. The bryophyte diversity index reached a maximum value of 18.219 in the corrosion pit, and then decreased to 11.949 in corrosion basin. The uniformity showed an upward trend, from 0.880, 0.862, 0.916 to 0.953, then dropped to 0.876 at the stage of corrosion basin. The environment plays an important role in the occurrence of corrosion patterns. Under the second grade condition (temperature of 17.5-21.4 ℃, humidity of 57.7%-72.6%RH, light of 2,700-5,900 Lux), the bryophytes have the strongest shaping effect on limestone. The change of dissolution patterns is often accompanied by the succession of the moss community. The bryophytes have a strong shaping effect on the formation of dissolution patterns.