Five sets of satellite images of spacing 37 years were used for mapping the land cover change in Jiaodong Peninsula in the present study. Unsupervised classification was applied to classify the land cover into 4 categories including vegetation, built-up land, water body and bared land. Among them vegetation and built-up land were listed as the first and second dominant category accounted for over 90%. Continuous decline in the land covered by vegetation were founded during the study period, whereas the built-up land showed a continuous increase. Symmetrical phenomena of positive and negative change were observed at every study period. It was indicted the conversion of vegetation into built-up land due to rapid population growth and urban sprawl. There was a marked acceleration in the rate of conversion since 1999. It could be seen more clearly from the maps of image interpretation. The change of water body was different from above two classes. The shrinkage and expansion of the category was due to the climate change. Remote sensing and GIS technologies were proved to be effective tools in monitoring land use change in the study.
Groundwater dependent ecosystems (GDEs) must have access to groundwater to maintain their ecological structure and function.The rapid expansion of humans has increased demands on groundwater for consumption, industry and agriculture, these demands alter groundwater regimes of natural GDEs, resulting in the degradation of ecosystem health. In order to improve the conceptual understanding of the role of groundwater in such ecosystems, this study examined key aspects of GDEs (hydrogeology, hydrogeochemistry and biodiversity) in the Langxi river watershed, North China. Results indicate that the karst in Langxi river watershed is well developed. The water chemistry types in the watershed were mostly HCO3-Ca type with different clustering characteristics, which indicate different degrees of interaction between surface water and groundwater, and that the recharge
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