干旱区生态环境知识资源中心(Arid): 基于MODIS叶面积指数的大渡河流域作物生态需水研究

Arid

	基于MODIS叶面积指数的大渡河流域作物生态需水研究
其他题名	ECOLOGICAL CROP WATER REQUIREMENT IN DADU RIVER WATERSHED BASED ON MODIS LAI
	严冬; 范建容; 欧国强
ISSN	1004-8227
出版年	2009
卷号	18 期号:10 页码:976-984
中文摘要	利用大渡河流域30年的气象资料,采用FAO最新修订的Penman-Monteith方程计算流域参考作物腾发量.同时获取大渡河流域2007年内45期MODIS LAI数据,根据叶面积指数与作物系数的经验关系得到作物系数2007年年内的变化情况,利用GIS中的Zonalmean函数对大渡河流域平均作物生态需水量年内变化进行估算.在根据年干燥度进行干湿区划的基础上,对作物生态需水来源进行分析.结果表明:大渡河流域2007年内生态需水总量为618.8 mm,月平均值为51.6 mm.其中作物生态需水量年内变化过程为夏季最高,占全年总需水量的35.7%,春季、秋季、冬季生态需水量逐渐减少分别占全年总量的30.4%、20.1%和13.8%.在雨季,降水完全可以满足流域生态需水量,降水是这一时期生态需水的主要来源.在旱季,半干旱区的生态需水来源受区域干燥度的影响较大,越干燥的地区降水占作物生态需水百分比就越高,半湿润区作物生态需水来源仍以降水为主,但降水占作物生态需水百分比除了受区域干燥度影响之外,可能还受到其它因素如:陡坡耕地占耕地总面积的比例的影响.
英文摘要	The meteorological data of Dadu River Watershed of 30 years were used to calculate the reference evapotranspiration based on the newly revised FAO Penman-Monteith equation. Forty-five scenes of MODIS LAI in 2007 were acquired at the same time. Based on the empirical relation between LAI and crop coefficient, the variation of crop coefficient in 2007 was obtained. The GIS Zonal analysis was conducted to estimate the annual variation of watershed mean crop water requirement. The analysis of the variation in source of crop water requirement was conducted based on the climate division by annual aridity index. Results show that the annual watershed mean crop water requirement in 2007 was 618.8 mm with monthly average of 51.6 mm. The crop water requirement is monomodally distributed in 2007 with a peak in summer(from June to August) of 221.2 mm that accounted for 35.7% of the annual amount. The crop water requirement in spring(March to May), autumn(September to November) and winter(December to February) accounted for 30.4%、20.1% and 13.8% of the annual amount respectively. In rainy season(May to October), the precipitation completely meets crop water requirement in both semi-humid and semi-arid areas. In arid season, while crop water requirement was mainly supplied by precipitation in semi-humid region, irrigation was the main source of crop water requirement in semi-arid region. While only aridity index imposed great influence on the precipitation percentage in the total amount of crop water requirement in semi-arid region, other factors such as topography may also plays important role in precipitation percentage of crop water requirement in semi-humid region.
中文关键词	叶面积指数 ; 作物 ; 生态需水量 ; 大渡河流域
英文关键词	MODIS MODIS leaf area index crop ecological water requirement Dadu river watershed
语种	中文
国家	中国
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:3676220
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/224441
作者单位	中国科学院水利部成都山地灾害与环境研究所, 成都, 四川 610041, 中国
推荐引用方式 GB/T 7714	严冬,范建容,欧国强. 基于MODIS叶面积指数的大渡河流域作物生态需水研究[J],2009,18(10):976-984.
APA	严冬,范建容,&欧国强.(2009).基于MODIS叶面积指数的大渡河流域作物生态需水研究.,18(10),976-984.
MLA	严冬,et al."基于MODIS叶面积指数的大渡河流域作物生态需水研究".18.10(2009):976-984.