检索结果-南通市图书馆

Sensitivity of Penman-Monteith reference crop evapotranspiration in Tao'er River Basin of Northeastern China

Chinese Geographical Science 2008年第4期18卷 340-347页

作者： LIANG Liqiao LI Lijuan ZHANG Li LI Jiuyi LI Bin Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

A non-dimensional relative sensitivity coefficient was employed to predict the responses of reference crop evapotranspiration (ET0) to perturbation of four climate variables in Tao'er River Basin of the northeastern China. Mean monthly ET0 and yearly ET0 from 1961 to 2005 were estimated with the FAO-56 Penman-Monteith Equation. A 45-year historical dataset of average monthly maximum/minimum air temperature, mean air temperature, wind speed, sunshine hours and relative humidity from 15 meteorological stations was used in the analysis. Results show that: 1) Sensitivity coefficients of wind speed, air temperature and sunshine hours were positive except for those of air tem- perature of Arxan Meteorological Station, while those of relative humidity were all negative. Relative humidity was the most sensitive variable in general for the Tao'er River Basin, followed by sunshine hours, wind speed and air tem- perature. 2) Similar to climate variable, monthly sensitivity coefficients exhibit large annual fluctuations. 3) Sensitivity coefficients for four climate variables all showed significant trends in seasonal/yearly series. Also, sensitivity coefficients of air temperature, sunshine hours and wind speed all showed significant trends in spring. 4) Among all sensitiv- ity coefficients, the average yearly sensitivity coefficient of relative humidity was highest throughout the basin and showed largest spatial variability. Longitudinal distribution of sensitivity coefficients for air temperature, relative hu- midity and sunshine hours was also found, which was similar to the distribution of the three climate variables.

关键词： reference crop evapotranspiration Penman-Monteith Equation sensitivity coefficient Tao'er River Basin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Climate change and its effect on reference crop evapotranspiration in central and western Inner Mongolia during 1961-2009

引用

Frontiers of Earth Science 2013年第4期7卷 417-428页

作者： Di HE Yaling LIU Zhihua PAN Pingli AN Liwei WANG Zhiqiang DONG Jingting ZHANG Xuebiao PAN Peiyi ZHAO College of Resources and Environmental Science China Agricultural University Beijing 100193 China Key Ecology and Environment Experimental Station for Field Scientific Observation in Hohhot Ministry of Agriculture Wuchuan County Hohhot 011705 China Department of Earth & Atmospheric Sciences Purdue University West Lafayette 47907 USA

Water resource is one of the major constraints to agricultural production in central and western Inner Mongolia, where are characteristic by arid and semi-arid climate. reference crop evapotranspiration （ETo） is an important part of water cycle in agricultural ecosystem, which has a direct effect on crop growth and yield. The implications of climate change on ETo are of high importance for agriculture regarding water management and irrigation scheduling. The aim of this study was to analyze the variations in climate and its effect on ETo in central and western Inner Mongolia over the period 1961 to 2009 For this purpose, data in ten meteorological stations across study area were collected and the FAO Penman-Monteith 56 method was used. Results showed that the average temperature, maximum temperature and minimum temperature increased by 0.49~C, 0.31~C and 0.70~C per decade during 1961-2009, respectively. In comparison, the daily temperature range decreased by 0.38~C per decade. The air relative humidity, sunshine hour, and 10-m wind speed decreased generally by 0.58%, 40.11 h, and 0.35 rrds per decade, respectively. Annual mean ETo decreased significantly at a rate of 12.2 mm per decade over the periods, this was mainly due to the decrease in wind speed in the study area. The decrease in wind speed may balance the effect of the increase in air temperature on ETo. Variations in spatial distribution of ETo and its main controlling factor were also detected among ten stations. Our results suggested that spatial and temporal distribution of ETo should be considered regarding the optimization of water resource management for agriculture in central and western Inner Mongolia under foreseen climate change.

关键词： climate change reference crop evapotranspiration partial correlation analysis Inner Mongolia

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Application of geodetector in sensitivity analysis of reference crop evapotranspiration spatial changes in Northwest China

引用

Research in Cold and Arid Regions 2021年第4期13卷 314-325页

作者： WenJu Cheng HaiYang Xi Sindikubwabo Celestin Northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhouGansu 730000China Key Laboratory of Eco-Hydrology of Inland River Basin Chinese Academy of SciencesLanzhouGansu 730000China University of Chinese Academy of Science Beijing 100049China

reference crop evapotranspiration(ET0)is an important parameter in the research of farmland irrigation management,crop water demand estimation and water balance in scarce data areas,therefore,it is very important to study the factors affecting the spatial variation of *** this paper,the Penman-Monteith formula was used to calculate ET0 which is the dependent variable of elevation(Elev),daily maximum temperature(T_(max)),daily minimum temperature(Tmin),daily average temperature(T_(mean)),wind speed(U_(2)),sunshine duration(SD)and relative humidity(RH).The sensitivity analysis of ET0 was performed using a Geodetector method based on spatial stratified *** applicability of Geodetector in sensitivity analysis of ET0 was verified by comparing it with existing research *** show that RH,Tmax,SD,and Tmean are the main factors affecting ET0 in Northwest China,and RH has the best explanatory power for the spatial distribu‐tion of *** has a unique advantage in sensitivity analysis,because it can analyze the synergistic effect of two factors on the change of *** interactive detector of Geodetector revealed that the synergistic effect of RH and Tmean on ET0 is very significant,and can explain 89%of the spatial variation of *** research provides a new method for sensitivity analysis of ET0 changes.

关键词： reference crop evapotranspiration Penman-Monteith geodetector sensitivity analysis northwest China

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparison of Calculation Methods for Potential reference crop evapotranspiration ET_0 in North Xinjiang

引用

Agricultural Science & Technology 2017年第5期18卷 920-923页

作者： Chunyan YIN Hu LIU Ruiqiang ZHANG Jian WANG Yongfu WEI Yantai Institute of Coastal Zone Research Chinese Academy of Sciences Institute of Water Resources for Pastoral Area Ministry of Water Resources

reference crop evapotranspiration (ET_0) is a critical part in water cycle and water balance of ecosystem, which is greatly important to effective utilization of agricultural water resources and for making reasonable irrigation system. In order to propose a suitable method for computing ET_0 in North Xinjiang, based on daily meteorological data from May 1 to September30, 2010 provided by Weather Station of Fuhai County, we used FAO56 Penman-Monteith as the standard formula to compute ET_0, compared the differences and relations between such the method and other 4 calculation formulas, and analyzed the cause of the deviation, finally evaluated the applicability of computational method in North Xinjiang. The results showed that the calculation results by FA056 PM Method was approximate to that by FAO Penman method and IA method, of which the relative error was 9.26% and 13.51% respectively, the ET_0 results calculated by PT method and HS method were generally greater than the results by FAO56 PM, and their deviation was very obvious.

关键词： North Xinjiang reference crop evapotranspiration Calculation method FAO56 PM

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Spatial variation of reference crop evapotranspiration on Tibetan Plateau

引用

Water Science and Engineering 2009年第1期2卷 112-120页

作者： Yong-hong YANG Zhan-yu ZHANG Xin-yi XIANG College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 P. R. China Tibet Agricultural and Animal Husbandry College Linzhi 860000 P. R. China School of Geographical Sciences Southwest University Chongqing 400715 P. R. China

This study is based on meteorological observation data collected at 38 weather stations on the Tibetan Plateau over several decades. Daily reference crop evapotranspiration （ETo） was calculated with the FAO-56 standard Penman-Monteith formula. A test of normality was performed with Statistica 6.0 software, isotropic and anisotropic semi-variogram analysis was conducted with the GS＋（geostatistics for the environmental sciences） system for Windows 7.0, and the characteristics of spatial variation of daily ETo were obtained. The following results can be obtained Daily ETo for different periods on the Tibetan Plateau are distributed normally; Except for daily ETo in the E-W （east-west） direction in the summer, which showed a slight negative correlation with distance change, the Moran＇s indexes of daily ETo for different periods in all directions on the Tibetan Plateau within a 100-km distance were positive, demonstrating a positive correlation with distance change; Variograms of daily ETo in June, the dry season, the wet season, as well as annual average daily ETo fit well with the Gaussian model; A variogram of daily ETo in December fit well with the exponential model; Variograms of daily ETo for the four seasons fit well with the linear With sill model.

关键词： reference crop evapotranspiration Penman-Monteith formula semi-variogram spatial variation tibetan Plateau

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Assessing crop Water Demand and Deficit for the Growth of Spring Highland Barley in Tibet, China

引用

Journal of Integrative Agriculture 2013年第3期12卷 541-551页

作者： LIU Zhao-fei YAO Zhi-jun YU Cheng-qun ZHONG Zhi-ming Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences

The aim of this study was to assess the crop water demand and deficit of spring highland barley and discuss suitable irrigation systems for different regions in Tibet, China. Long-term trends in reference crop evapotranspiration and crop water demand were analyzed in different regions, together with crop water demand and deficit of spring highland barley under different precipitation frequencies. Results showed that precipitation trends during growth stages did not benefit the growth of spring highland barley. The crop coefficient of spring highland barley in Tibet was 0.87 and crop water demand was 389.0 ram. In general, a water deficit was found in Tibet, because precipitation was lower than water consumption of spring highland barley. The most severe water deficit were in the jointing to heading stage and the heading to wax ripeness stage, which are the most important growth stages for spring highland barley; water deficit in these two stages would be harmful to the yield. Water deficit showed different characteristics in different regions. In conclusion, irrigation systems may be more successful if based on an analysis of water deficit within different growth stages and in different regions.

关键词： Tibet highland barley Penman-Monteith reference crop evapotranspiration crop water requirement crop coefficient crop water deficit

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Quantitative estimation of climate change effects on potential evapotranspiration in Beijing during 1951-2010

引用

Journal of Geographical Sciences 2014年第1期24卷 93-112页

作者： LIU Haijun LI Yan JOSEF Tanny ZHANG Ruihao HUANG Guanhua College of Water Sciences Beijing Normal University Beijing 100875 China College of Water Resources and Civil Engineering China Agricultural University Beijing 100083 China Institute of Soil Water and Environmental Sciences Agricultural Research Organization The Volcani CenterP. O. Box 6 Bet Dagan 50250 Israel State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of WaterResources and Hydropower Research Beijing 100048 China

℃ Climate change is likely to affect hydrological cycle through precipitation, evapotranspiration, soil moisture etc. In the present study, an attempt has been made to study the climate change and the sensitivity of estimated evapotranspiration to each climatic variable for a semi-arid region of Beijing in North China using data set from 1951 to 2010. Penman-Monteith method was used to calculate reference crop evapotranspiration （ETo）. Changes of ETo to each climatic variable was estimated using a sensitivity analysis method proposed in this study. Results show that in the past 60 years, mean temperature and vapor pressure deficit （VPD） were significantly increasing, relative humidity and sunshine hours were significantly decreasing, and wind speed greatly oscillated without a significant trend. Total precipitation was significantly decreasing in corn season （from June to September）, but it was increasing in wheat season （from October to next May）. The change rates of tem- perature, relative humidity, VPD, wind speed, annual total precipitation, sunshine hours and solar radiation were 0.42℃, 1.47%, 0.04 kPa, 0.05 m.s-1, 25.0 mm, 74.0 hours and 90.7 MJ.m-2 per decade, respectively. In the past 60 years, yearly ETo was increasing with a rate of 19.5 mm per decade, and total ETos in wheat and corn seasons were increasing with rates of 13.1 and 5.3 mm per decade, respectively. Sensitivity analysis showed that mean air temperature was the first key factor for ETo change in the past 60 years, causing an annual total ETo increase of 7.4%, followed by relative humidity （5.5%） and sunshine hours （-3.1%）; the less sensitivity factors were wind speed （0.7%）, minimum temperature （-0.3%） and maximum temperature （-0.2%）. A greater reduction of total ETo （12.3%） in the past 60 years was found in wheat season, mainly because of mean temperature （8.6%） and relative hu- midity （5.4%）, as compared to a reduction of 6.0% in ETo during corn season due to sunshinehours （-6.9%）, relative

关键词： climatic variables reference crop evapotranspiration Penman-Monteith equation changing trend sensitivity analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Spatial variability of irrigation factors and their relationships with “corridor-barrier” functions in the Longitudinal Range-Gorge Region

引用

Science Bulletin 2007年第S2期 33-41页

作者： GU ShiXiang~(1,2) HE DaMing~(3+) CUI YuanLai~1 XIE XianHong~1 LI YuanHua~4 1 State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China 2 Yunnan Institute for Investigation,Design and Research of Water Resources & Hydropower Engineering,Kunming 650021,China 3 Asian International Rivers Center,Yunnan University,Kunming 650091,China 4 Department of Irrigation,Drainage and Rural Water Supply,Ministry of Water Resources,P.R.China,Beijing 100053,China

Based on the monthly meteorological data at 58 meteorological stations from 1971 to 2000 in the Lon- gitudinal Range-Gorge Region（LRGR）and the surrounding areas,six factors including yearly ET0, maximum monthly ET0（May）,minimum monthly ET0（December）,paddy irrigation quota and total ag- ricultural irrigation quota（yearly and main irrigation period from April to June）were selected to exam- ine their spatial variability using a geostatistical *** results indicated that the coefficients of Moran's I,describing the Intensity of spatial autocorrelation,were greater in longitudinal direction than in other directions;the spatial variabilities of the six parameters were mainly caused by structural factor accounting for 60.2%—87.9%;the largest variabilities of ET0（yearly,in May and December）ap- peared in the northwest-southeast and northeast-southwest *** to the summer monsoon atmospheric circumfluence from the Indian Ocean and the Pacific Ocean,and continental warm-dry current in winter,the minimum fractal dimension and the maximum spatial variability of ET0（yearly,in May and December）occurred in southwest-northeast and southeast-northwest *** highest variabilities of paddy and total agricultural irrigation requirements occurred in the south-north direction due to the vapor and energy diffusion caused by corridor function of the longitudinal *** minimum spatial autocorrelation was in east-west direction,which proves that the six parameters of agricultural irrigation requirement were influenced by the"corridor-barrier"function in the LRGR and its surrounding areas.

关键词： reference crop evapotranspiration water demand of paddy irrigation agriculture irrigation quota spatial variability scale "corridor-barrier"function the Longitudinal Range-Gorge Region(LRGR)

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Regional Calibration of Hargreaves Equation in the Xiliaohe Basin

引用

Journal of Geoscience and Environment Protection 2016年第7期4卷 28-36页

作者： Leizhi Wang Qingfang Hu Yintang Wang Yong Liu Lingjie Li Tingting Cui Water Resources and Hydraulic Engineering & Science State Key Laboratory of Hydrology Nanjing Hydraulic Research Institute Nanjing China

This paper investigates calibration of Hargreaves equation in Xiliaohe Basin. Twelve meteorologicalgauges located within Xiliaohe Basin in Northeast China were monitored during 1970 and 2014 providing continuous records of meteorological data. Taking daily ET0 calculated by Penman-Montieth equation as the benchmark, the error of Hargreaves equation for computing ET0 was evaluated and the investigation on regional calibration of Hargreaves equation was carried out. Results showed there was an obvious difference between the calculating results of Hargreaves and Penman-Monteith equation. The estimation of the former was obviously higher during June and September while lower during the rest time in a year. The three empirical parameters of the Hargreaves equation were calibrated using the SCE-UA (Shuffled Complex Evolution) method, and the calibrated Hargreaves equation showed an obvious promotion in the accuracy both during the calibration and verification period.

关键词： reference crop evapotranspiration Penman-Monteith Hargreaves SCE-UA Xiliaohe

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：