Estimation of soil water content and evapotranspiration from irrigated cropland on the North China Plain
文献类型：SCI/SSCI论文
| 作者 | Yu Q.; Xia J. |
| 发表日期 | 2008 |
| 关键词 | soil water balance soil water content evapotranspiration cropland model North China Plain winter-wheat use efficiency balance model simulation field validation richards climate maize |
| 英文摘要 | For nearly 30 y, cropland on the North China Plain (NCP) has been irrigated primarily by pumping groundwater with no sustainable management strategy. This has caused a continuous decline of the water table. A sustainable groundwater management and irrigation strategy must be established in order to prevent further decline of the water table; to do this, one must quantify soil water content and daily rates of deep percolation and locate evapotranspiration from irrigated cropland. For that purpose, we developed a three-layer soil-water balance (SWB) model based on an approach described by Kendy et al. (2003). In this model, the unsaturated soil zone is divided into three layers: a surface active layer, a middle active soil layer, and a lowest passive soil layer. The middle and the lowest layers dynamically change with the development of crop rooting depth. A simple "tipping bucket" routine and an exponential equation are used to redistribute soil water in the three soil layers. The actual evapotranspiration estimated is partitioned into soil evaporation and crop transpiration using a dual crop coefficient reference approach. At first, the model was calibrated using data obtained from five deficiently irrigated field plots located at an experimental site in the NCP between 1998 and 2003. Then, the model was validated by comparing estimated soil water contents with measured ones at three other plots with nondeficient irrigation. The estimates of actual evapotranspiration were compared with those measured with a large-scale weighing lysimeter (3 m(2)). The index of agreement (IA) for soil water contents varied between 0.62 and 0.80; the concordance correlation coefficient (CCC) and the root mean square error obtained from the same comparison were 0.34-0.65 and 0.043-0.074 cm(3) cm(-3), respectively. The rates of 10 d mean evapotranspiration estimated by the model show a good fit to those measured by the large-scale lysimeter; this is indicated by IA = 0.94 and CCC = 0.88. Our results indicate that at the irrigated cropland on the plain, deep soil water-percolation rates are usually < 200 mm y(-1) under nondeficient-irrigation conditions. |
| 出处 | Journal of Plant Nutrition and Soil Science-Zeitschrift Fur Pflanzenernahrung Und Bodenkunde |
| 卷 | 171 |
| 期 | 5 |
| 页 | 751-761 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1436-8730 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/23756]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Yu Q.,Xia J.. Estimation of soil water content and evapotranspiration from irrigated cropland on the North China Plain. 2008. |
入库方式： OAI收割
来源：地理科学与资源研究所
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