陕西关中西部近70年作物生长季降水序列分析——以杨陵为例  

Analysis of precipitation series for growing season during past 70 years in western Guanzhong——A case study of Yangling

作　　者：许秀娟[1] 穆婉红[1] 蒋骏[1] 

机构地区：[1]西北农林科技大学,陕西杨凌712100

出　　处：《干旱地区农业研究》2003年第4期130-133,共4页Agricultural Research in the Arid Areas

基　　金：农业部948项目"高产优质抗逆苜蓿新品种的引进及繁育(2001-372)";"西北旱区优质高产抗逆苜蓿品种的筛选及其配套栽培技术研究(2002-09-02A)

摘　　要：以重建的杨陵近70年的降水序列为代表,对关中西部作物生长季降水量的变化趋势进行了分析研究。结果表明,杨陵69a作物生长季的平均降水量为535.8mm,约占年降水量的92.3%。在1932～2000年,共出现旱年9a,偏旱年15a,涝年12a,偏涝年11a,其出现频率分别为0.130,0.217,0.174和0.159。1932～1958年和1959～2000年的气候倾向率分别为82.2mm/10a和-48.6mm/10a。作物生长季降水序列在1975/1976年间出现气候突变现象。突变点后的平均降水量较突变点前减少了20.6%,突变点后的25a以偏旱为主,干旱和偏旱频率达0.60,较偏涝和涝的频率高0.44。针对20世纪后期降水持续偏少的趋势,调整产业结构和种植业结构,防治水污染和采取各种节水措施是持续发展工农业生产首要解决的问题。Using the rebuilt precipitation series of Yangling in past 70 years, the climate change of precipitation for growing season of crops in western Guanzhong and it's evolution tendency was analysed. The results showed that the mean precipitation of growing season of crops was 535.8 mm and was 92.3% of mean annual precipitation in past 69 years. The dryness, inclined dryness, wetness and inclined wetness were appeared in 9 years, 15 years, 12 years and 11 years separately from 1932 to 2000, and their frequency was 0.130, 0.217, 0.174 and 0.159 separately. The climatic trend rate of precipitation series for growing season was 82.2 mm/10a from 1932 to 1958, and 48.6 mm/10a from 1959 to 2000. There was a phenomenon of climatic jump for the precipitation series of growing season in 1975 and 1976. The mean precipitation after climatic jump decreased 20.6% compared with that before climatic jump, The frequency of dryness and inclined dryness was 0.6, being 0.44 higher than the frequency of wetness and inclined wetness , so the climate has been tending to dryness. On this climatic background, it will be necessary to adjust the industrial structure and eropping structure, to prevent and control water contamination and to adopt watersaving measurements so as to realize the sustainable development of industry and agriculture.

关 键 词：关中西部地区 作物生长季 降水量 交化趋势 降水序列 气候倾向率 气候突变 

分 类 号：S161.6[农业科学—农业气象学]