| Karst groundwater has a close relation with soil water and fissure water, the study of Karst groundwater in contact with the surrounding has important significance. In this paper, two complete watershed Karst Valley serve as the background to contrast the changes of medium aquatic chemistry in surface water and ground water. From the angle of human activities, to explore the anisotropy of aquifer medium, discuss the influence of the different ways of land use on water quality, and analyze material motion. Based on the groundwater and soil, groundwater and wall rock process system elaborated the relationship between groundwater, surface water and soil. Moreover, different Karst aquifer structure and different land use can influence the aquatic chemicals and water movement, so we hope to put forward some research references.(1) Different environment isotopic characteristics of groundwater provide an important approach to establishing reasonable modes for hydrology cycle. With variation data of δD and δ18O, the variance among the relations of recharge, residence and export between water bodies were analyzed in samples from Qingmuguan Basin. Results indicate that δD and δ18O values change in different water bodies, namely, fissure water<cave water<surface karst springs<karst lake water<surface catchment <soil water. In rainy time, precipitation is the main source of supplying water bodies, but not the only source, and different water bodies show a certain mutual conversion. Surface karst spring, Karst lake, surface water is relying on the precipitation. Cave water’s recharge comes from precipitation, soil, water and fissure water. The source of Fissure water supply is more complex. The δ18O values enriched significantly from Yankou to Jiangjia Cave, which indicated that the hydraulic connection of the upstream and the downstream was better. Between Tianchi and Dingjia Cave, the δ18O values showed that there was no significant hydraulic connection along the ground river, and is consistent with the tracer test results.(2) River DIC concentrations is increased from upstream to downstream both north and south two underground, two of the underground river downstream of the river basin in the north of the carbonate dissolution of DIC corrosion is higher than that of sulfuric acid and nitrate, vice versa, the carbonate dissolution of DIC corrosion is lower in south export. DIC show anisotropy for each spring point on the space. Human activity is the main factors influencing the changes among all kinds of index in the study area, DIC concentration is high in large vegetation cover areas, it should be advisable in mountain forest vegetation in karst area landscape. Soil infiltration water increased with the increase of atmospheric precipitation. The average contents of Ca2+、Mg2+change in atmospheric precipitation, soil water and groundwater were followed by atmospheric precipitation<soil water<groundwater, and the longer time the water-rock, the greater ion concentration. It shows that soil is an important source of various elements of soil water, the main source of cave dripping water is overlying soil permeability water. The Migration path of study water is the surface water, soil water and groundwater vertical flow.(3) δ13CDIC change in water depends on the agricultural activity, soil CO2and water plant photosynthesis. Study area water like Shui tian pool, Ding jia cave, Longjia wan, Yankou pond affected by agricultural activities is the highest, Luo Jiacao and Yuan Jiagou take second place, Mushuiwo and Dalv pool is the most significant, the influence in sampling points of the southern agricultural activity is greater than the northern. δ13CDIC in soil water had the same trend as in groundwater, when δ13CDIC in soil water is low, it is low also in groundwater, and vice versa,δ13CDIC delta is higher in strong photosynthesis water body, whereas weak photosynthesis with lower δ13CDIC delta. Therefore,δ13CDIC delta in Karst lake, surface water and so on are higher than cave water and fissure water. |
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