2000—2020年河湟谷地农业干旱研究

doi:10.12118/j.issn.1000-6060.2022.367

摘要/Abstract

摘要：

选取植被健康指数（Vegetation health index，VHI）为农业干旱程度衡量指标，利用Mann-Kendall（M-K）检验法和小波分析法对河湟谷地2000—2020年农作物生长季（3—11月）干旱程度进行逐年和逐季节研究（以3—5月为春季、6—8月为夏季、9—11月为秋季）。结果表明：（1）河湟谷地农业干旱区主要集中在大通河中游地区、湟水河干流区和黄河谷地。（2）河湟谷地农业干旱面积呈现明显的地域分异特点，由北到南农业干旱面积逐渐增大。（3）河湟谷地农业干旱面积在年际尺度上有在周期性波动中不断减小的趋势，2007—2008年是河湟谷地农业干旱面积发生突变的时间点，此后河湟谷地农业干旱面积开始急剧减少；春季是河湟谷地受农业干旱影响最严重的季节。研究结果对掌握河湟谷地农业干旱空间分布及变化趋势、促进青海省农业健康发展具有重要意义。

关键词: 河湟谷地, 农业干旱, 植被健康指数, 生长季

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

孙南沙,陈琼,刘峰贵,周强,郭媛媛. 2000—2020年河湟谷地农业干旱研究[J]. 干旱区地理, 2023, 46(3): 437-447.

SUN Nansha,CHEN Qiong,LIU Fenggui,ZHOU Qiang,GUO Yuanyuan. Agricultural drought research in Yellow River-Huangshui River Valley from 2000 to 2020[J]. Arid Land Geography, 2023, 46(3): 437-447.

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