In this study, the relationship between land use and cover change (LUCC) and variation of groundwater level and quality in the Sangong Oasis Region was investigated using a spatial geostatistical approach. Specificall...In this study, the relationship between land use and cover change (LUCC) and variation of groundwater level and quality in the Sangong Oasis Region was investigated using a spatial geostatistical approach. Specifically, interactions among groundwater, surface water, and LUCC were analyzed through the utilization of geographical information system (GIS), remote sensing (RS) Imagery processing, and geostatistics. Study outputs indicated that recharging into the groundwater did not change significantly during the period from 1978 to 1998. However, both LUCC and groundwater level changed substantially in the Sangong Oasis Region, and their variations were closely correlated to each other spatially and temporally over the past two decades. It confirmed that urbanization process and increased industrial activities were the direct reasons of groundwater table descending and the deterioration of water quality. The results of this research provided a scientific basis for understanding sustainability-related problems and solution options in the oasis areas of western China.展开更多
Dear Editor, The origin of vertebrate-specific characters and functional systems is one of the most important questions in the evo- lutionary biology （Holland and Chen, 2001）. Amphioxus, the most basal chordate, is ...Dear Editor, The origin of vertebrate-specific characters and functional systems is one of the most important questions in the evo- lutionary biology （Holland and Chen, 2001）. Amphioxus, the most basal chordate, is considered as the sister of verte- brates based on the recent molecular phylogenetic evi- dences, and it is used as an ideal model organism to study the origin and evolution of vertebrate organ systems including immune system （Yu and Holland, 2009）. Three digestive organs, gill slits, hepatic caecum and intestine in amphioxus were also considered as primitive immune organs of amphioxus （Schmitz et al., 2000）. In addition to the respiratory and digestive function,展开更多
基金supported by the National Key Basic Research Development Program of China (2009CB825105)National Natural Science Foundation of China (No. 40730633)
文摘In this study, the relationship between land use and cover change (LUCC) and variation of groundwater level and quality in the Sangong Oasis Region was investigated using a spatial geostatistical approach. Specifically, interactions among groundwater, surface water, and LUCC were analyzed through the utilization of geographical information system (GIS), remote sensing (RS) Imagery processing, and geostatistics. Study outputs indicated that recharging into the groundwater did not change significantly during the period from 1978 to 1998. However, both LUCC and groundwater level changed substantially in the Sangong Oasis Region, and their variations were closely correlated to each other spatially and temporally over the past two decades. It confirmed that urbanization process and increased industrial activities were the direct reasons of groundwater table descending and the deterioration of water quality. The results of this research provided a scientific basis for understanding sustainability-related problems and solution options in the oasis areas of western China.
文摘Dear Editor, The origin of vertebrate-specific characters and functional systems is one of the most important questions in the evo- lutionary biology （Holland and Chen, 2001）. Amphioxus, the most basal chordate, is considered as the sister of verte- brates based on the recent molecular phylogenetic evi- dences, and it is used as an ideal model organism to study the origin and evolution of vertebrate organ systems including immune system （Yu and Holland, 2009）. Three digestive organs, gill slits, hepatic caecum and intestine in amphioxus were also considered as primitive immune organs of amphioxus （Schmitz et al., 2000）. In addition to the respiratory and digestive function,
