Spatiotemporal characteristics of hydrochemistry in Asian arid inland basin-a case study of Shiyang River Basin.

Inland rivers play a key role in supplying water for domestic and agricultural purposes in Asian arid inland basin. This paper investigates the chemical composition of precipitation, river water, and groundwater, providing evidence for the influencing factors the water composition in the Shiyang River Basin. Water samples were collected and analyzed to determine the content of major cations (Ca, Mg, Na, K, and NH+ 4) and anions (HCO- 3, Cl, NO- 3, NO- 2, F, and SO2-4), total solid solubility, and pH values.

[Ecological and economic harmony evaluation and spatial evolution of the Hexi corridor, northwest China].

The relationship between economic development and environment and the evolution characteristics of spatial pattern in Hexi Corridor of Northwest China were analyzed based on Landsat images in 1985, 1995, 2000 and 2011 with twenty counties in Hexi Corridor chosen as the basic research units. The ecological economic harmony during 1985-2011 was estimated according to ESV (ecosystem services value) and EEH (ecological and economic harmony) index with the ecosystem services value estimation methods. The results showed that the land type of the study area dramatically changed during the study period, the grassland decreased badly, and the construction land and cultivated land increased quickly.