Modeling water use, transpiration and soil evaporation of spring wheat-maize and spring wheat-sunflower relay intercropping using the dual crop coefficient approach
Modeling water use, transpiration and soil evaporation of spring wheat-maize and spring wheat-sunflower relay intercropping using the dual crop coefficient approach
复制标题
使用双作物系数方法模拟春小麦-玉米和春小麦-向日葵套种的水分利用、蒸腾和土壤蒸发
DOI：
10.1016/j.agwat.2015.10.024
复制
发表时间：
2016-02-01
影响因子：
6.7
通讯作者：
Pereira, Luis S.
中科院分区：
文献类型：
--
作者：
Miao, Qingfeng;Rosa, Ricardo D.;Pereira, Luis S.
黄河上游河套灌区以小麦、玉米、向日葵为主要农作物，普遍采用间作方式。为了更好地利用土地、水、辐射能和养分，春小麦传统上与玉米（W-M）间作，最近与向日葵（W-S）间作。考虑到河套灌区需要减少灌溉用水的需要，本研究旨在评估W-M和W-S间作系统与单作相同作物的作物水分利用。SIMDualKc模型采用双作物系数法，将作物蒸散分为作物蒸腾和土壤蒸发。一个新的模型方法进行了测试，以计算一个综合的基础作物系数的间作，K-cb间，它使用的每日值的K-cb的组成作物以及各自的高度和作物覆盖的地面部分。SIMDualKc首先使用2010-2012年的田间数据对小麦、玉米和向日葵作为单一作物进行了校准和验证，随后与新开发的方法一起使用，该方法使用2010-2011年的W-M和W-S田间数据进行了验证。小麦，玉米和向日葵校准的K-cb值与文献和拟合优度指标相比，显示出用于校准和验证的模拟的高准确性。结果表明，河套灌区地下水的贡献很大，地面灌溉条件下土壤蒸发量较小。间作系统的实际蒸散量、作物蒸腾量、灌溉用水量和地下水贡献量均大于单作系统，间作系统的产量显著高于单作系统。(C)2015 Elsevier B. V.版权所有。
Intercropping is commonly used in the Hetao irrigation district, upper Yellow River basin, where the main crops are wheat, maize and sunflower. For a better use of land, water, radiation energy, and nutrients, spring wheat is traditionally intercropped with maize (W-M) and, more recently, with sunflower (W-S). Considering the need to reduce diversions of water for irrigation in Hetao, this study aims to assess crop water use of W-M and W-S intercropping systems in comparison to the same crops in monocropping. The dual crop coefficient approach was adopted with the SIMDualKc model, which allows partitioning crop evapotranspiration into crop transpiration and soil evaporation. A new model approach was tested to compute a combined basal crop coefficient for the intercropping, K-cb inter, which uses the daily values of the K-cb of the component crops together with the respective heights and fractions of ground covered by the crops. SIMDualKc was first calibrated and validated for wheat, maize and sunflower as single crops using field data of 2010-2012 and was later used with the new developed approach, which was validated with W-M and W-S field data of 2010-2011. The K-cb values calibrated for wheat, maize and sunflower compared well with literature and goodness of fit indicators have shown high accuracy of simulations used for calibration and validation. Results evidenced the importance of groundwater contribution in Hetao, and that soil evaporation is there low under surface irrigation. Moreover, it was found that actual evapotranspiration, crop transpiration, irrigation water use and groundwater contribution of intercropping systems were larger than those of the component sole crops, which led to significantly higher yields of intercropping relative to those of single crops. (C) 2015 Elsevier B.V. All rights reserved.