SPATIO-TEMPORAL VARIATION OF PRECIPITATION AND DROUGHT IN SOUTHWEST GUIZHOU AUTONOMOUS PREFECTURE OF CHINA DURING 1961-2015

摘要

Precipitation is one of the most important meteorological variables which can impact the occurrence of drought. Analyze the spatio-temporal variation of precipitation and drought is very important for drought resistance and the agricultural production, while such work are rare reported in Southwest Guizhou Autonomous Prefecture (SGAP). Thus, eight meteorological stations located within the SGAP were selected, and the integrated approach (linear regression analysis, moving average, geostatistical analyst and Mann-Kendall trend detection test) was used to assess the spatiotemporal variation of precipitation and drought. The results revealed that the precipitation in Wangmo (WM) and Xingren (XR) stations showed an increasing trend with values of 8.269 and 20.29 mm/year. While Anlong (AL), Ceheng (CH), Pu'an (PA), Qinglong (QL), Xingyi (XY), and zhenfeng (ZF) stations showed decreasing trends of -2.419,- 1.848, -3.681, -3.779, -1.815, and -1.758 mm/year. The spring precipitation in the central and southwest was significantly lower on the spatial scale. The spring drought in SGAP has occurred frequently due to the precipitation decline year by year and the uneven spatial and temporal distribution, which impacted the regional drought and agricultural production. The results of this study will provide theoretical guidance for drought resistance and agricultural production in SGAP of China.