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亚热带红壤丘陵区季节性干旱成因及其发生规律研究
引用本文:黄道友,彭廷柏,陈桂秋,王克林.亚热带红壤丘陵区季节性干旱成因及其发生规律研究[J].中国生态农业学报,2004,12(1):124-126.
作者姓名:黄道友  彭廷柏  陈桂秋  王克林
作者单位:中国科学院亚热带区域农业研究所,长沙,410125
基金项目:中国科学院知识创新工程重要方向性项目 (KZCX2 SW 415 ),国家重点科技攻关专题 (85 0 0 9 0 1 0 4、96 0 0 4 0 3 0 2 )资助
摘    要: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 5 0 .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 5 9.5 % ,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 2 0世纪 90年代 >80年代 >70年代 >6 0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。

关 键 词:季节性干旱  成因  发生规律  红壤丘陵区
收稿时间:2003/1/31 0:00:00
修稿时间:2003年1月31日

Study on causes and occurrence rules of seasonal drought in subtropical red soil hilly region
HUANG Dao-You,PENG Ting-Bai,CHEN Gui-Qiu and WANG Ke-Lin.Study on causes and occurrence rules of seasonal drought in subtropical red soil hilly region[J].Chinese Journal of Eco-Agriculture,2004,12(1):124-126.
Authors:HUANG Dao-You  PENG Ting-Bai  CHEN Gui-Qiu and WANG Ke-Lin
Abstract: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 resist the stress.
Keywords:Seasonal drought  Cause  Occurrence rule  Red soil hilly region  
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