干旱区生态环境知识资源中心(Arid): 西北旱区19612011年参考作物蒸散量的时空分异

Arid

	西北旱区19612011年参考作物蒸散量的时空分异
其他题名	Spatiotemporal variations of the reference crop evapotranspiration in the arid region of northwest China during 19612011
	王小静; 李志; 赵姹; 张志强
来源期刊	生态学报
ISSN	1000-0933
出版年	2014
卷号	34 期号:19 页码:5609-5616
中文摘要	全球变化背景下分析参考作物蒸散量的变化特征,对于农业生产和水资源管理等有重要指导意义。根据西北旱区152个气象站点19612011年气象资料计算参考作物蒸散量(ET_0),分析了其空间分布及时间变化趋势,并探讨了其变化原因。1961-2011年西北旱区年均ET_0为1100.4 mm/a,但存在空间变异,低值出现在黄土高原南部区域,高值出现在西北部沿东南-西北方向的条带上。ET_0整体呈不显著的上升趋势,但64和36个站点分别呈显著的上升和下降趋势;西北旱区ET_0发生突变的年份东部较西部晚。ET_0的时空变异是气象因子时空变化的组合效应,ET_0对相对湿度和最高温度的变化最敏感,但过去50a ET_0变化中风速和最高温度的贡献率最大。西北旱区ET_0的变化发生了重要改变,由2000年以前的下降趋势转变为目前的上升趋势,可能加剧该区的水资源短缺状况,需引起足够的重视。
英文摘要	Reference crop evapotranspiration (ET_0) is wide lyconsidered to be one of the best means to evaluate agriculture water use, which is of great importance for crop production. The agriculture in the arid region of northwest China has suffered from severe water shortage and imbalance between water quantity and land area. Under the background of global warming,it is necessary to evaluate the spatiotemporal characteristics of ET_0 as it is sensitive to climate change. Observed daily data during 19612011 from 152 meteorological stations, including temperature, relative humidity, wind speed and sunshine hours,are used to calculate the ET_0 based on Penman-Monteith equation. Mann-Kendall,Pettitt and Inverse Distance Weighted Interpolation are used to analyze the spatiotemporal characteristics of ET_0. Results show that the annual mean ET_0 is1100.4 mm/a with obvious spatial variations. Values in the south region of the Loess Plateau are the smallest, while those in a southeast-northwest strip beside the Loess Plateau are the greatest. ET_0 shows a insignificant upward trend during 19612011 for the whole region,and the annual increase is 0.45 mm/a; however, significant upward and downward trends are detected for 64 and 36stations, respectively.ET_0 has occurred abrupt changes from 1970s to 1990s;however, the years occurring abrupt changes in the eastern part are later than those in the western part. Sensitive coefficients and contribution rates are calculated to analyze the reasons of the spatiotemporal pattern for ET_0. Results show that the spatiotemporal characteristics of ET_0are from the combined effects of climatic factors. Relative humidity and maximum temperature is the most sensitive factors for ET_0 ; however,wind speed and maximum temperature have the greatest contribution rates for the changes of ET_0 during the past 50 years. The changes of ET_0 in the arid region of northwest China have transformed from downward trend to upward trend since 2000s, which will exacerbate the water shortage of this region. Therefore, more attentions should be paid to it and some countermeasures should be planned.
中文关键词	西北旱区 ; 参考作物蒸散量 ; 时空变异 ; 归因分析
英文关键词	aridregion of northwest China reference crop evapotranspiration spatiotemporal variation attribution analysis
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5261768
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/231612
作者单位	西北农林科技大学资源环境学院, 杨凌, 712100
推荐引用方式 GB/T 7714	王小静,李志,赵姹,等. 西北旱区19612011年参考作物蒸散量的时空分异[J]. 西北农林科技大学,2014,34(19):5609-5616.
APA	王小静,李志,赵姹,&张志强.(2014).西北旱区19612011年参考作物蒸散量的时空分异.生态学报,34(19),5609-5616.
MLA	王小静,et al."西北旱区19612011年参考作物蒸散量的时空分异".生态学报 34.19(2014):5609-5616.