江淮分水岭区农作物干旱时空变化特征

发布时间：2018-02-09 03:22

本文关键词： 无有效降水连续日数农作物干旱时空特征逐日干旱发生频率　出处：《水土保持研究》2017年06期 　论文类型：期刊论文

【摘要】：利用江淮分水岭区17个市、县气象台站1980—2009年降水数据,基于改进的无有效降水连续日数干旱评估指标,分析农作物干旱时空变化特征。结果表明:(1)春播夏收型农作物在寿县、长丰、定远、明光一带以北地区易发生春旱;夏播秋收型农作物在寿县、淮南、长丰、定远、凤阳一线多形成夏秋旱,西南和东北地区也较易发生夏秋旱;春播秋收型农作物生长期内大部分地区秋旱多发,其中寿县、肥东东南部和全椒西南部部分为秋旱高发地区;越冬型作物在明光北部、来安北部、淮南西南部以及寿县北部等地多生秋冬春旱,其他地区也易发生秋冬春旱,且持续时间均较长。(2)从年际演变趋势看,夏播秋收型、越冬型农作物干旱范围和强度均略有增长,春播秋收型农作物干旱强度微增长、范围略减小;春播夏收型农作物干旱强度和范围均呈微减的趋势。总体上,研究区域干旱强度略有上升,且北部高于南部,越冬型作物高于其他类型农作物,研究结果可为区域农业生产防旱提供科学依据。
[Abstract]:Based on the precipitation data of 17 cities and counties in Jianghuai watershed area from 1980 to 2009, the temporal and spatial variation characteristics of crop drought were analyzed based on the improved evaluation index of drought without effective precipitation. The results showed that the spring sowing and summer harvest crops were in Shouxian County. In Changfeng, Dingyuan, north of Mingguang area, spring drought is easy to occur, summer sowing and autumn harvest type crops in Shouxian County, Huainan, Changfeng, Dingyuan, Fengyang are more likely to form summer and autumn drought, and the southwest and northeast areas are also prone to summer and autumn drought. During the growth period of spring sowing and autumn harvest crops, autumn drought occurs frequently in most areas, including Shou County, southeast Feidong and southwest part of Quanjiao, where autumn drought is high, while winter crops are in the northern part of Mingguang and northern Lai'an. In southwestern Huainan and northern Shouxian, there are frequent autumn and winter droughts, and other areas are prone to autumn and winter drought, and the duration of spring drought is longer. (2) from the trend of interannual evolution, the range and intensity of drought of summer sowing and autumn harvest type, winter type crop drought range and intensity have increased slightly. The drought intensity of spring and autumn harvest crops increased slightly and the range decreased slightly, while the drought intensity and range of spring and summer harvest crops showed a slight decreasing trend. In general, the drought intensity in the study area increased slightly, and the drought intensity in the north was higher than that in the south. Overwintering crops are higher than other types of crops. The results can provide scientific basis for regional agricultural production and drought prevention.
【作者单位】：安徽省基础测绘信息中心;滁州学院安徽地理信息集成应用协同创新中心;
【基金】：滁州学院科研启动基金项目(2014qd032) 安徽省高校自然科学研究一般项目(KJ2016B04) 2011协同创新中心规划项目(2015GH02)
【分类号】：S423

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