1Challenges and opportunities for karst research of our country under the new situation329-3312On origin of the Jiudongtian cave hall in the sinking stream,Dafang county, Guizhou province, China: Evidence for dominant rightward erosion in northern hemisphere by subterranean stream332-3393Primary study on seismic record from speleothems in caves340-3474Spatial distribution and diurnal variation in CO_2 concentration,temperature and relative humidity of the cave air-A case study from Water Cave, Benxi, Liaoning, China348-3545Fengcong, fenglin, cone karst and tower karst355-3696Classification and exploitive technical condition of karst water source field in southwest China370-3747Analysis and simulation to the relation between rainfall and runoff in karst basin with artificial neural network model375-3798Evaluation on karst leakage of coal ash site in Wanhe381-3849Response of the Beiwenquan hot spring's hydrochemical features in Chongqing to the Wenchuan earthquake of magnitude 8.0 in Sichuan385-39010Research on division treatment to eco-construction of karst rock deserted land in southwest China karst area391-39611Contrastive studies on agro-ecological geology environment quality between karst and non-karst area in Guizhou397-40112Changing rule of soil physicochemical features under different grade of desertification——A case study at Puding station of Guizhou karst center402-40513Study on coupling eco-agricultural system with community tourist system in karst rock desertification area——A case in Yangchangdong, Qingzhen406-41214Influence of microhabitat to community structure of soil macrofauna in karst rocky desertification413-41815An alternative study on the most suitable fusion method of IRS-P6 in the karst plateau mountainous area——A case in Sizhai town, Pingtang county of Guizhou province419-42516The application of Gray GM (1,1) model and Verhulst model in the forecast of farmland in the karst area——A case in Bijie ecological experimental area426-43117Sinkhole insurance statutes of Florida in America and its enlightenment432-438 