文献类型：期刊文献

英文题名：Spatiotemporal characteristics of dryness/wetness conditions across Qinghai Province, Northwest China

作者：Liu, Zhiyong[1] Zhou, Ping[2] Zhang, Fangqiu[2] Liu, Xiande[3] Chen, Gang[4]

第一作者：Liu, Zhiyong

通信作者：Zhou, P[1]

机构：[1]Heidelberg Univ, Inst Geog, D-69120 Heidelberg, Germany;[2]Guangdong Acad Forestry, Res Stn Dongjiangyuan Forest Ecosyst, Guangzhou 510520, Guangdong, Peoples R China;[3]Acad Water Resources Conservat Forests Qilian Mt, Zhangye 734000, Peoples R China;[4]Chinese Acad Forestry, Inst Forest Resource Informat Tech, Beijing 100091, Peoples R China

年份：2013

卷号：182

起止页码：101-108

外文期刊名：AGRICULTURAL AND FOREST METEOROLOGY

收录：;Scopus(收录号：2-s2.0-84885186759);WOS:【SCI-EXPANDED(收录号:WOS:000327000200010)】；

基金：The study was financially supported by the State Forestry Administration Public Benefit Research Foundation of China (201104005, 201204104) and State Forestry Administration 948 Innovative Significant Project of China (2011-76). Support was also received from the China Scholarship Council and CFERN & GENE Best Ecological Paper Award. In addition, we are very grateful to the National Meteorological Administration of China and Chinese Academy of Sciences for the original data. Special appreciation is also given to the editor and anonymous reviewers for their constructive reviews and comments on this manuscript.

语种：英文

外文关键词：Drought; Self-calibrating PDSI; Mann-Kendall test; Rotated EOF; Qinghai Province

摘要：It is vital to understand long-term drought variability and its causes for better water resource management in precipitation deficit regions. In order to assess the characteristics and potential risk of drought in Qinghai Province (as a typical arid and semi-arid area in China), the temporal trends of precipitation and temperature data (daily records from 1961 to 2006) of 44 stations across this province were firstly detected using the Mann-Kendall trend test. The self-calibrating Palmer drought severity index (PDSI), rotated empirical orthogonal function (REOF), and continuous wavelet transform (CWT) were used to further evaluate and investigate spatial patterns, temporal variations and periodicities of dryness/wetness conditions in Qinghai. The results show that: (1) A significant increasing trend in annual mean temperature can be detected in most parts of Qinghai over the last five decades, especially in Qaidam Basin. A non-significant downward trend in annual precipitation can be found in the eastern and southeastern regions of the province; (2) Four dominantly geographical sub-climate regions of dryness/wetness conditions were identified - the source region (Tuotuo River) of the Yangtze River, Qaidam Basin, the Qilian Mountains area, and the eastern agricultural area; (3) With respect to temporal variations of dryness/wetness conditions in each sub-region, only the source region (Tuotuo River) of the Yangtze River indicates a long-term wet tendency over the past 46 years; (4) A 3-5-year significant (at 95% confidence level) periodical oscillation can be detected in the PDSI series of the source region of the Yangtze River and 5-7-year and 8-10-year periods exist in Qaidam Basin. However, periodical features in the Qilian Mountains and eastern agricultural area are not statistically noticeable. The results of this study will be beneficial for water resource management, forecasting, and preparations for potential drought hazards in Qinghai Province and also be a valuable reference for other arid and semi-arid areas. (C) 2013 Elsevier B.V. All rights reserved.