| 毛玉琴.气候暖干化对环县土壤贮水量的影响[J].干旱地区农业研究,2009,27(5):127~132 |
| 气候暖干化对环县土壤贮水量的影响 |
| Impact of climate change to soil pondage in Huanxian |
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| DOI：10.7606/j.issn.1000-7601.2009.05.24 |
| 中文关键词: 气候暖干化 环县 趋势 土壤贮水量 |
| 英文关键词:warming and drying tendency of climate Huanxian trend soil water storage |
| 基金项目:国家级行业专项“西北地区旱作农业对气候变暖的响应特征及其预警和应对技术”(GYHY200806021) |
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| 中文摘要: |
| 通过对干旱半干旱区环县近38年(1971~2008)来的气温、降水分析发现,环县气候暖干化明显,年平均气温增高,增幅为0.0385℃/a,增温幅度远高于全国近40年增温幅度(0.004/a);气温年代变化以80年代到90年代上升幅度最大;季节变化以春季、冬季增温最为显著,夏季、秋季增温缓慢。年降水量呈略减趋势,逐月降水量变化不一致,6月9、月降水量呈显著增加,7月、11月呈显著减少,其它各月正常或略减变化;年代变化,70到80年代呈现增加,80到90年代减少,90到2000年来呈现增加;从80年代以来,春季降水呈显著减少,表明春旱明显,夏季、秋季和冬季的降水随年代不同有增有减,变化趋势不一。近26年(19832008)来,0~100 cm土壤贮水量呈升高趋势变化,年增幅为0.5586 mm/a。其中,春季和秋季呈递增变化,增幅分别为0.941 mm/a0、.5164 mm/a;夏季呈现减少趋势;不论是在干旱年、多雨年、或是不同年代情况下,一年中土壤贮水量的低值区总是出现在作物旺盛生长时期的6月份, 而高值区总是出现在秋季, 而不是出现在降雨量最多的夏季;气候暖干化对耕作层30 cm以上土壤贮水量影响明显, 年景不同, 土壤贮水量差异较大。 |
| 英文摘要: |
| The results of analysis of temperature and precipitation on arid and semi\|arid Huanxian County in the past 38 years (1971～2008) show that there was a clear tendency of warming and drying there, and the annual average temperature increased with a rate of 0.0385℃/a, much higher than that of the nationwide rate of 0.004℃/a in the past 40 years.The maximum temperature increase occurred in the 1980s and 1990s.For seasonal changes, we found significant warming in spring and winter, but slow warming in summer and autumn.The annual precipitation showed a slight decreasing trend, while the monthly precipitation varied, which increased significantly in June and September while decreased remarkably in July and November, and maintained normal or reduced slightly in other months.The precipitation increased from 1970s to 1980s, decreased from 1980s to 1990s, and increased again from 1990s to 2000.Since 1980s, the precipitation in spring decreased obviously and resulted in spring drought, while it in other three seasons showed no uniform changing tendency, increasing or decreasing in different period of years.In the past 26 years (1983～2008) , 0～100 cm soil water storage showed an increasing trend, with an annual growth rate of 0.5586 mm/a.Among them, it increased in spring and fall, with the increasing rate of 0.941 mm/a and 0.5164 mm/a respectively, while it decreased in summer.No matter in dry years or wet years, or in different period of years, the minimum amount of soil water storage always appeared in June when the crops grew vigorously, while the maximum amount always appeared in fall, rather than in the wettest summer.The warming and drying tendency of climate had obvious impact on 0～30 cm soil water storage, which varied much in different years. |
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