Spatiotemporal Evolution and Hysteresis Analysis of Drought Based on Rainfed-Irrigated Arable Land

Drought poses a serious threat to agricultural production and food security in the context of global climate change. Few studies have explored response mechanism lag time drought meteorological from perspective cultivated land types. This paper analyzes spatiotemporal evolution patterns hysteresis relationship droughts middle lower reaches Yangtze River China. Here, Moderate Resolution Imaging Spectroradiometer (MODIS) vegetation index products surface temperature were selected calculate Temperature Vegetation Dryness Index (TVDI) 2010 2015. Furthermore, we obtained Standardized Precipitation Evapotranspiration (SPEI) Palmer Severity (PDSI) for same period. Based on these indices, analyzed correlation between rainfed irrigated arable land. The results showed that, (1) compared with SPEI, high spatial resolution PDSI data deemed more suitable subsequent accurate scientific analysis droughts. (2) When occurs, is first experience drought, then alleviates when most severe land, indicating that sensitive events exposed degree risk. However, actually susceptible due intervention irrigation measures. (3) According cross-wavelet transform analysis, significantly behind by about 33 days during development process events. (4) distribution coefficient TVDI shows area negative correlations croplands positive account 77.55% 68.04% cropland areas, respectively. study clarifies distinguishes details meteorological-to-agricultural noting an can provide useful guidance monitoring management project planning River.