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Arid Land Geography ›› 2023, Vol. 46 ›› Issue (3): 437-447.doi: 10.12118/j.issn.1000-6060.2022.367

• Biology and Pedology • Previous Articles     Next Articles

Agricultural drought research in Yellow River-Huangshui River Valley from 2000 to 2020

SUN Nansha1(),CHEN Qiong1,2(),LIU Fenggui1,2,ZHOU Qiang1,2,GUO Yuanyuan1   

  1. 1. College of Geography, Qinghai Normal University, Xining 810008, Qinghai, China
    2. Academy of Plateau Science and Sustainability, Xining 810008, Qinghai, China
  • Received:2022-07-20 Revised:2022-09-01 Online:2023-03-25 Published:2023-03-31
  • Contact: Qiong CHEN E-mail:say0524@163.com;qhchenqiong@163.com

Abstract:

In this study, the vegetation health index was selected as a measure of agricultural drought, and the Mann-Kendall test and wavelet analysis were used to investigate the drought level in the Yellow River-Huangshui River Valley (YHV) of China from 2000 to 2020. The drought degree of the crop growing season (March to November) was investigated yearly and seasonally (spring: March-May, summer: June-August, and autumn: September-November). The results are as follows: (1) Agricultural drought areas in YHV were primarily concentrated in the middle reaches of the Datong River, the main stream area of the Huangshui River, and the Yellow River Valley. (2) The agricultural drought area in YHV exhibited obvious regional differentiation and increased gradually from north to south. (3) The agricultural drought area of YHV has a trend of decreasing with periodic fluctuation in the interannual scale. 2007—2008 is the time point of abrupt changes in the agricultural drought area of YHV, and then, the agricultural drought area of YHV began to decrease rapidly. Spring is the season most severely affected by agricultural drought in YHV. This study is critical for understanding the spatial distribution and variation trend of agricultural drought in YHV and promoting the healthy development of agriculture in Qinghai Province.

Key words: Yellow River-Huangshui River Valley, agricultural drought, vegetation health index, growing season