摘要
采用线性回归、气候倾向率、积分湿度指标和干湿指标分析辽宁本溪降水趋势变化和旱涝频率及发生时段。结果表明,在近55年里,本溪年降水量倾向率为-30.749mm/10a,趋势减少165mm;植物生长季降水量倾向率为-31.371/10a,趋势减少173mm。气候类型有所转变,由20年前是轻涝型转为湿润型。农业需水满意程度在150%以上,年平均降水盈余290mm;中涝至重涝有10年,约五年一遇;出现轻旱有5年,约十年一遇。春季中旱以下约十年二遇,中涝以上约十年一遇;夏季中涝以上约二年一遇;秋季中涝以上约十年二遇,中旱以下约十年四遇。7、8月重涝出现频率54.5%。5月和9月是干旱发生频率较高时段。
Linear regression,climate trend rate,integral humidity indicators and indicators of wet and dry were adopted to analyze the precipitation change,drought or waterlogging frequency and occurrence period in Benxi of Liaoning. The results showed that in recent 55a,the tendency of the annual precipitation rate of Benxi was-30.749 mm/10a,reducing 165 mm; precipitation tendency rate during the growing season of plants was-31.371/10a,reducing 173 mm. The climate type was changed from light flood to wet type. Agricultural water demand satisfaction was above 150%,and annual average precipitation surplus was 290 mm; the floods to heavy floods have 10a,about once in five years; occurrence of mild drought has 5a,about once in ten years. Dry spring in the case of the following decade or two,in a case of floods over about a decade; in floods over the summer about once in two years; fall in the second case of floods over about a decade,in case of drought the following about four years. The occurrence frequency of heavy waterlogging in July and August was 54.5%. May and September was the high frequency of drought periods.
出处
《安徽农业科学》
CAS
北大核心
2010年第23期12577-12579,12610,共4页
Journal of Anhui Agricultural Sciences
关键词
降水
趋势变化
旱涝程度
农业
本溪
Precipitation
Variation trend
Dryness
Agriculture
Benxi
