title: Winter wheat water productivity evaluated by the developed remote sensing evapotranspiration model in Hebei Plain, China.
abstract: Agricultural water is the main reason for the rapid decline of the NCP groundwater levels. It is of vital importance for the NCP sustainable agricultural development to master the ETa and its CWP. In this paper, the EBEM model was developed according to the theory of energy balance. From 2001 to 2006, the winter wheat ETa and CWP were estimated, and the spatial and temporal variations and their influencing factors were studied in the Hebei Plain. The results indicate that the EBEM model performed well by applying MODIS data to estimate the daily net radiation and ETa. For the daytime net radiation, the relative error between the estimation and the measurement amounted to 8.2% and the SEE was 0.82 MJ m(-2)/day. The average ETa deviation between the estimates and the measures amounted to 0.86 mm daily, and the SE was 1.2 mm. The spatial variations indicated that the major distribution of ETa ranged from 350 to 450 mm, which trended downward within the study area from west to east. In the study period, the winter wheat CWP was mainly distributed between 0.29 and 1.67 kg/m(3). In space, the CWP was higher in the west than in the east.
authors: Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China.
authors: Shengwei
authors: S
authors: Zhang
authors: College of Life Sciences, Inner Mongolia Agricultural University, Hohhot 010018, China.
authors: Hongbin
authors: H
authors: Zhao
authors: State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China.
authors: Huimin
authors: H
authors: Lei
authors: Key Laboratory of Coastal Biology & Bioresources Utilization, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Yantai 264003, China ; Institute of Biotechnology, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China.
authors: Hongbo
authors: H
authors: Shao
authors: Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China.
authors: Tingxi
authors: T
authors: Liu
mesh_terms: D002681:China; D060587:Groundwater; D008962:Models, Theoretical; D018526:Plant Transpiration; D058998:Remote Sensing Technology; D012987:Soil; D014908:Triticum / Q000378:metabolism*; D014887:Weather
chemical_list: D012987:Soil
references: Plant Physiol Biochem. 2012 Aug;57:93-105
references: 22698752