文摘
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结合多年气象资料系统研究亚热带红壤丘陵区季节性干旱成因与发生规律结果表明,该区季节性干旱严重,"土壤-作物"干旱年发生概率为85.7%,其中≥中等干旱年发生概率为50.0%,7~8月份和11~12月份为年内高发期,以夏秋干旱危害最大;气候性干旱(Z值法)年发生概率为59.5%,其中≥中等干旱年发生概率为31.0%."土壤-作物"干旱明显大于气候性干旱,且二者发生概率和危害程度均为20世纪90年代>80年代>70年代>60年代,表明红壤丘陵区抵御季节性干旱的能力呈下降趋势,农业生态系统抗逆性能仍在不断退化. |
其他语种文摘
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The causes and occurrence rules of seasonal drought in the subtropical red soil hilly region were systematically studied by analyzing the meteorological data. The results show that the occurrence probability for "soil-plant" drought is 85.7%, among which that of moderate or severe drought is 50% or so. The highly frequent drought occurs in the period from July to August and from November to December each year. The drought occurring in July and August can cause a great damage to crops. The occurrence probability for climate-induced drought is 59.5%, among which that of moderate or severe drought is 31.0 %. The "soil-plant" drought is more serious than the climate-induced one. The order of both the probabilities of these two kinds of drought and the extent of damage are 1990s> 1980s> 1970s> 1960s, indicating that it is decreasing for the ability of the red soil hilly region to resist the seasonal drought, declining for the agro-ecosystem to re-sist the stress. |
来源
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中国生态农业学报(中英文)
,2004,12(1):124-126 【核心库】
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关键词
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季节性干旱
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成因
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发生规律
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红壤丘陵区
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地址
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中国科学院亚热带区域农业研究所, 长沙, 410125
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1671-3990 |
学科
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农学(农艺学) |
基金
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中国科学院知识创新工程重要方向项目
;
国家科技攻关计划重点项目
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文献收藏号
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CSCD:1862294
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