| 王毅荣.黄土高原土壤干旱异常阶段特征[J].干旱地区农业研究,2005,(2):209~214 |
| 黄土高原土壤干旱异常阶段特征 |
| Temporal characteristics of abnormal soil drought in the Loess Plateau of China |
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| DOI：10.7606/j.issn.1000-7601.2005.02.43 |
| 中文关键词: 黄土高原 土壤干旱 异常阶段 特征 |
| 英文关键词:Loess Plateau soil drought characteristic |
| 基金项目:科技部社会公益研究专项"中国干旱气象灾害监测预警方法研究"项目(2004DE100592-B)； 甘肃省科学技术攻关计划项目(ZGS042-A44-017) |
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| 中文摘要: |
| 为揭示黄土高原严重土壤干旱的时空特征,主要使用EOF、REOF、CEOF和小波分析等方法,研究了该区域近40a(1961～2000年)的土壤干旱变化。结果表明:黄土高原土壤干旱变化以全区一致为主,干旱趋势趋于加重,20世纪90年代干旱加剧最为明显;干旱存在2～4a和7～9a左右的年际振荡,以2～4a为主;干旱最容易在7～10月发展到最重,其间干旱信息由高原中部向西、向东、向北传播;7～10月干旱变化存在3个敏感区,划分了3个次区域,各次区域间干旱强度、频次差异较大。 |
| 英文摘要: |
| In order to reveal temporal and spatial characteristics of soil drought, the paper mainly uses the EOF, REOF and CEOF and wavelet analysis to study the 40-year (19612000) change of soil drought in the loess plateau. It finds that soil drought changed consistently across the region, tending to worsen, especially obvious in 1990's; it fluctuated with a two periods of which one lasted 24 years and the other lasted 79 years; it mostly varied with the period of 24 years; the worst soil drought often occurred between July and October during which soil drought spread from the middle of the plateau toward west, east and north; there were three sensitive regions to soil drought between July and October and they could be divide into three sub-regions whose drought intensities and frequencies much differed. |
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