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Using the closed chamber technique daily changes of net ecosystem carbon dioxide (CO2) exchange (NEE) and ecosystem respiration (Re) were determined in a ryegrass ecosystem on eight separated days at half hour interval from morning to afternoon in Taiyuan basin, Shanxi province of China. The gross primary production (GPP) was calculated as the difference of NEE and Re. The objective of the study was...
Natural wetlands are the largest land-based natural sources for methane (CH4) emissions. China's natural wetland area accounts for about 4% of the area of the natural wetlands worldwide. Based on the data of global lakes and wetlands, in this study we conducted modeling work of CH4 emissions from natural wetlands in China by using terrestrial ecosystem model (TEM) of the 1995-2005. The results show...
Hydrogeochemistry data were utilized to understand origin, distribution, and geochemical evolution of the high-fluoride groundwater in Taiyuan basin, China. In the study area, the spatial distribution of the high fluoride groundwater are strictly controlled by the host rock and geomorphic conditions. Three kinds of groundwater with the F- concentration of < 1.5 mg/1,1.5~2 mg/1 and >2 mg/1 are...
The environment of the mountainous area is one of important parts in urban ecological and economic system. It has an impact on the stabilization of urban ecological environment. Mentougou District in Beijing, a mountainous area, had abundant mineral resources originally. Many years' exploitation activities made the mineral resources exhausted. It is an inevitable objective law that each mining site...
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