Satellite-Based Monitoring of Decadal Soil Salinization and Climate Effects in a Semi-arid Region of China

摘要: Soil salinization is a common phenomenon that affects both the environment and socio-economy in arid semi-arid regions; it also an important aspect of land cover change. In this study, we integrated multi-sensor remote sensing data with field survey to analyze processes soil area China from 1979 2009. Generally, salt-affected soils increased by 0.28% per year remarkable acceleration 1999 2009 (0.42% increase year). contrast, surface water bodies showed decreasing trend (−0.08% year) same period. Decreases precipitation increases aridity due annual (especially summer) warming provided favorable condition for salinization. The relatively flat terrain favored waterlogging at surface, continuous drought facilitated upward movement accumulation saline calcium. Meanwhile, land-use practices played crucial role accelerating conversion cropland natural vegetation greatly demand groundwater irrigation aggravated process Furthermore, there are potential feedbacks regional climate. can limit efficiency plant use as well photosynthesis; therefore, reduces amount carbon sequestrated terrestrial ecosystem. absorbed solar radiation increasing albedo. Such conversions significantly change energy balance between atmosphere.