Trends and climatic sensitivities of vegetation phenology in semiarid and arid ecosystems in the US Great Basin during 1982–2011

摘要: Abstract. We quantified the temporal trend and climatic sensitivity of vegetation phenology in dryland ecosystems US Great Basin during 1982–2011. Our results indicated that greenness increased significantly study period, this positive occurred autumn but not spring summer. Spatially, increases were more apparent northwestern, southeastern, eastern less central southwestern Basin. In addition, start growing season (SOS) was advanced while end (EOS) delayed at a rate 3.0 days per decade period. The significant delay EOS lack earlier leaf onset caused length (GSL) to increase decade. Interestingly, we found interannual variation mean calculated for period March November (spring, summer, – SSA) correlated with surface air temperature SSA strongly total precipitation. On seasonal basis, spring, mainly attributable changes pre-season precipitation winter spring. Nevertheless, climate warming appeared play strong role extending GSL that, turn, resulted upward greenness. Overall, our suggest wintertime springtime played stronger than affecting variability greenness, responsible observed 30-year from 1982 2011.