Modeling of continental-scale crop water requirement and available water resources |
| |
| Authors: | Yasushi Ishigooka Tsuneo Kuwagata Shinkichi Goto Hitoshi Toritani Hiroyuki Ohno Shin-ichi Urano |
| |
| Institution: | (1) National Institute for Agro-Environmental Sciences, 3-1-3 Kannondai, Tsukuba 305-8604, Japan;(2) Graduate School of Agriculture, Hokkaido University, Kita9 Nishi9, Kita-ku, Sapporo 060-8589, Japan |
| |
| Abstract: | The relationship between agricultural water demand and supply has been of interest to government decision makers and scientists
because of its importance in water resources management. We developed a water cycle model for eastern Eurasia that can estimate
water requirements for crop growth and evaluate the demand–supply relationships of agricultural water use on a continental
scale. To produce an appropriate water cycle, the model was constructed based on small drainage basins. To validate the model
performance with respect to simulated runoff, which is here considered as the available water resource, we compared our outputs
with those of other models and with observed river discharges. The results show that this model is comparable to other models
and that it is applicable for the evaluation of water cycles at continental scale. We defined two types of crop water deficits
(CWDs) as indicators of agricultural water demand. These were formulated by considering the physical processes of crop water
use; we did not include water consumption that is dependent on cultivation management practices, such as water losses in irrigation
systems. We assessed the reliability of our indicators by comparison with indicators from other studies and with published
statistics related to agricultural water use. These comparisons suggest that our indicators are consistent with independent
data and can provide a reasonable representation of water requirements for crop growth. |
| |
| Keywords: | Crop water deficit Water cycle model Water resources |
| 本文献已被 SpringerLink 等数据库收录！ |
|
