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Study on causes and occurrence rules of seasonal drought in subtropical red soil hilly region
Author(s): 
Pages: 124-126
Year: Issue:  1
Journal: CHINESE JOURNAL OF ECO-AGRICULTURE

Keyword:  季节性干旱成因发生规律红壤丘陵区;
Abstract: 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.
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