干旱区生态环境知识资源中心(Arid): 近50年来甘肃省河东地区春玉米干旱时空特征分析

Arid

	近50年来甘肃省河东地区春玉米干旱时空特征分析
其他题名	Spatial-Temporal Characteristics of Drought and Spring Maize in Eastern Gansu
	尹海霞; 张勃; 张建香; 张调风; 李小亚; 靳自宝
来源期刊	资源科学
ISSN	1007-7588
出版年	2012
卷号	34 期号:12 页码:2347-2355
中文摘要	根据甘肃省河东地区15个气象站点50年的气象资料,利用FAO Penman-Monteith模型和所提供的作物系数计算出各站点春玉米不同生育阶段的作物需水量,在此基础上计算出作物水分亏缺指数(CWDI),并划分河东,地区的干旱等级,分析春玉米干旱发生的时空特征。结果表明:在春玉米生长季内,CWDI呈现先增大后减小的趋势,其中最大值出现在6月中下旬,且每旬的CWDI值均大于10%,即在作物整个生长季,降水都无法满足春玉米需水的要求。不同等级干旱发生的频率:轻旱8%-20%;中旱7%-23%;重旱0~17%;特旱0~47%。生长季内,河东地区春玉米干旱发生程度基本由南向北递增,不同生育阶段干旱的严重程度:抽雄-开花期>拔节期>乳熟前期>出苗-七叶期>乳熟后期一成熟期。近50年来,出苗一七叶期和拔节期的干旱有逐渐缓解的趋势;抽雄一开花期和乳熟前期干旱变化的趋势大致相同:20世纪60年代中后期及70年代初为干旱的严重时期,70年代中后期有所缓解,至今又有加重的趋势;乳熟后期一成熟期,近50年来干旱有加重的趋势。
英文摘要	The total number of droughts is increasing in China due to global climate change. Extraordinary droughts are of a long duration, wide range and severe disaster degree. Eastern Gansu is located in the semi-arid-semi-humid climate zone, and is a rain fed agricultural region. Because the distribution of precipitation is uneven, the water requirements of spring maize are different during various growth stages. Understanding the temporal and spatial distribution and evolution of droughts during spring maize is important to the sustainable development of the economy. Here, according t0 50 years of weather data from seven meteorological stations in eastern Gansu, the water requirements of spring maize at different growth stages was calculated using the FAO Penman-monteith model and coefficient. The crop water deficit index (CWDI) was calculated and the drought grade was divided into four communities. The results show that the CWDI became larger initially and then smaller during the growth period for spring maize; the ten days, middle and last ten days of June contained maximum values. The CWDI of every ten days was over 10%, showing that precipitation in the growth period cannot meet the water requirements of spring maize. The frequency of different classes of drought were 8%-20% for light drought, 7%- 23% for middle drought, 0-17% for heavy drought, and 0-47% for excessive drought. The relative severity of the drought followed the pattern: tasselling stage to flowering stage > jointing stage > pre-milk stage > emergence stage to seven leaf stage > late-milk stage to mature stage. In the last 50 years, the severity of droughts has increased in this area.
中文关键词	作物水分亏缺指数 ; 干旱 ; 时空特征 ; 干旱频率 ; 春玉米 ; 甘肃省河东地区
英文关键词	The crop water deficit index (CWDI) Drought Spatial-temporal characteristics Drought frequency Spring maize Eastern Gansu
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRONOMY
WOS研究方向	Agriculture
CSCD记录号	CSCD:4731535
来源机构	西北师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/229171
作者单位	西北师范大学地理与环境科学学院, 兰州, 甘肃 730070, 中国
推荐引用方式 GB/T 7714	尹海霞,张勃,张建香,等. 近50年来甘肃省河东地区春玉米干旱时空特征分析[J]. 西北师范大学,2012,34(12):2347-2355.
APA	尹海霞,张勃,张建香,张调风,李小亚,&靳自宝.(2012).近50年来甘肃省河东地区春玉米干旱时空特征分析.资源科学,34(12),2347-2355.
MLA	尹海霞,et al."近50年来甘肃省河东地区春玉米干旱时空特征分析".资源科学 34.12(2012):2347-2355.