摘要
根据江南红黄壤丘陵区１７个站点１９５１～１９８８年逐旬气象资料以及相应地区的土壤物理参数，模拟出各站点土壤层的土壤湿度数据库，并分析土壤季节性干旱规律。其中衡阳、邵阳地区是江南红黄壤丘陵区土壤季节性干旱最严重的地区，其次是南昌、贵溪市一带。通常年份，２月中旬～６月下旬，全区几乎不出现土壤季节性干旱。土壤季节性干旱主要出现在７月下旬到１０月下旬，其机率在５０％以上，８月上、中旬，９月中～１０月中旬出现的机率为６０％。江南红黄壤丘陵区夏季干旱往往连着秋季干旱。这种连旱的机率衡阳地区在６０％以上。冬季１～２月的土壤季节性干旱应是第一年秋旱的延续。文中也提出江南红黄壤丘陵区土壤季节性干旱的防御措施。
According to the every 10-day routine meteorological data and the related physical parametersof soil from 17 stations in the red-yellow soil zone south of Yangtze River in period from 1051 to1988, we simulated a data base,calculated the soil moisture and analysed the characteristics of theseasonal soil drought about these stntions.The most serious seasonal soil drought occurs in theregions Hengyang and Shaoyang.The second serious drought is in the Nanchng and GuixiRegions.In normal years,the seasonal soil drotight seldom occurs in the zone from the middle ofFebruary to middle of June. Drought occurs mainly in the period from middle of July to lateOctober;the probability is higher than 50%. In the early and middle of August and from middleof September to middle of October, such a probability is more the 60%.The autumn soildrought frequently succeeded the summer soil drought in the zone; the probability of suchsuccessive drought is higher than 60% in Hengyang region. Winter soil drought should be theprolongation of autumn soil drought.Countermeasures against the seasonal soil drought are alsoput forwnrd in this paper.
出处
《长江流域资源与环境》
CAS
CSCD
1995年第3期251-256,共6页
Resources and Environment in the Yangtze Basin
关键词
江南红黄壤
土壤
湿度
模拟
季节性干旱
ed-yellow soil zone south of Yangtze River, soil moisture, simulation, seasonal soil drought
