农田水盐运移与作物生长模型耦合及验证

合理定量描述土壤水盐动态及作物生长过程对于干旱灌区制定适宜的农业用水措施具有重要意义。该文以SWAP（soil water atmosphere plant）模型为基础,采用变活动节点法实现了对土壤融化期的水盐运移模拟,并在根系吸水计算中引入了基于S形函数的水盐胁迫计算方法,以修正原SWAP模型对根系吸水的模拟。进一步嵌入了参数与输入数据较少且可以模拟作物生长过程及实际产量的EPIC（environmental policy integrated calculator）作物生长模型,构建了改进的农田尺度土壤水盐动态与作物生长耦合模拟模型-SWAP-EPIC。分别采用宁夏惠农灌区春小麦和春玉米田...

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Bibliographic Details
Published in农业工程学报 Vol. 29; no. 4; pp. 110 - 117
Main Author 徐旭 黄冠华 黄权中
Format Journal Article
LanguageChinese
Published 中国农业大学水利与土木工程学院,北京 100083%中国-以色列国际农业研究培训中心,北京 100083 2013
Subjects
EPIC
SWAP
作物
土壤水分
土壤盐分
改进模拟
生长
土壤水分
SWAP
soil moisture
modified modeling
EPIC
soil salt
作物
growth
crops
改进模拟
土壤盐分
生长
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ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2013.04.014

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Summary:合理定量描述土壤水盐动态及作物生长过程对于干旱灌区制定适宜的农业用水措施具有重要意义。该文以SWAP（soil water atmosphere plant）模型为基础,采用变活动节点法实现了对土壤融化期的水盐运移模拟,并在根系吸水计算中引入了基于S形函数的水盐胁迫计算方法,以修正原SWAP模型对根系吸水的模拟。进一步嵌入了参数与输入数据较少且可以模拟作物生长过程及实际产量的EPIC（environmental policy integrated calculator）作物生长模型,构建了改进的农田尺度土壤水盐动态与作物生长耦合模拟模型-SWAP-EPIC。分别采用宁夏惠农灌区春小麦和春玉米田间试验数据,对SWAP-EPIC模型田间适用性进行了检验。对比分析各层土壤水分与盐分浓度、作物生长指标（叶面积指数、地上部生物量）的模拟值与实测值,结果表明：春小麦和春玉米试验中土壤水分的平均相对误差MRE和均方根误差RMSE均接近于0且模型Nash效率系数NSE值趋近于1,水分模块模拟精度较高,盐分浓度模拟存在略微差异但总体上一致性较好,并且作物生长指标匹配良好;同时,模拟的产量和蒸散发均较为接近实际值,春小麦和春玉米产量模拟相对误差分别为4.9%和3.3%。综上,该文改进的SWAP-EPIC模型可良好地应用于寒旱区农田尺度土壤水盐运移与作物生长耦合模拟。
Bibliography:11-2047/S
Xu Xu, Huang Guanhua, Huang Quanzhong（1. College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; 2. Chinese-Israeli International Center for Research and Training in Agriculture, Beijing 100083, China）
soil moisture, growth, crops, soil salt, modified modeling, SWAP, EPIC
The quantitative description of soil water flow, solute transport and crop growth processes at field scale is significant for the decision-making of appropriate water use practices in arid irrigation districts. In this study, a modified agro-hydrological model （SWAP-EPIC） for coupled simulation of soil water flow, solute transport and crop growth was developed based on SWAP （soil water atmosphere plant） model and EPIC （environmental policy integrated calculator） crop growth model. The variable active-node method was adopted into the original SWAP model for reasonably simulating the soil water and solute transport processes during soil thawing period. Additionally, the S-shaped osmotic he
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2013.04.014