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DRAINMOD-N II 模拟冬季长期覆盖黑麦对 地下排水及NO3 -N 流失的影响
杜 璇1,2,3; 冯浩1,2,4; Matthew J. Helmers3; 齐志明5
2017
Source Publication农业工程学报
Volume33Issue:12Pages:153-161
Abstract

在玉米-大豆轮作系统中种植冬季覆盖作物黑麦有助于减小地下排水量和硝态氮(NO3
-N)的流失量。该研究利
用美国爱荷华州的试验数据校正和验证了DRAINMOD-N II 模型在美国寒冷地区的适用性,并模拟长期(20 a)种植冬季
覆盖作物黑麦对地下排水量和氮素运移的影响。结果表明,模型模拟地下排水量和NO3
-N 流失量时,Nash-Sutcliffe 模型
效率系数(Nash-Sutcliffe efficiency,NSE)>0.65、百分比偏差(percent bias,PBIAS)在±25%之间、均方根误差与标准
差比值(ratio of root mean square error to standard deviation,RSR)≤0.7 均在误差范围内;模拟地下排水中NO3
-N 浓度时,
NSE>0.50、PBIAS 在±15%之间、RSR≤0.5 均在误差范围内,说明模型模拟的效果好。长期种植冬季覆盖作物黑麦可降
低排水量8.1%(2.5 cm),减小NO3
-N 流失量16.6%(6 kg/hm2),NO3
-N 流量加权平均浓度下降了8.6%(1 mg/L,以N
计),增加蒸散值5.9 %,模型模拟值与实测值拟合效果好,表明模型具有良好的水文和氮素运移模拟功能,可以模拟不
同农田管理措施对地下水和氮素运移的长期影响,为优化农田管理措施提供参考。

Other Abstract

Planting winter rye cover crop can reduce subsurface drainage and NO3
-N loss in corn-soybean rotation. Field data
from Iowa was used to calibrate DRAINMOD-N II and evaluate its applicability in cold regions in US. This study simulated
the long-term (20 years) effects of winter rye cover crop on subsurface drainage and nitrogen dynamics using DRAINMOD-N
II. Two treatments were set in Agricultural Drainage Water Quality-Research and Demonstration Site in Iowa. One treatment
was with rye planting in winter (rye-maize-rye-soybean rotation) and the other was bare in winter (only maize-soybean). The
experiments lasted for 5 years from 2005 to 2009. The drainage was collected and NO3
-N content in the drainage was
measured. The DRAINMOD-N II model was used for simulation of change in the drainage and NO3
-N content from 1990 to
2009. The results showed that the DRAINMOD-N II model satisfactorily simulated subsurface drainage and NO3
-N loss with
Nash-Sutcliffe efficiency (NSE) larger than 0.65, percent bias (PBIAS) smaller than 25%, and ratio of root mean square error
to standard deviation (RSR) not larger than 0.70. Flow-weighted average NO3
-N concentration (FWANC) were simulated
satisfactorily, with NSE larger than 0.50, PBIAS within 15%, and RSR not larger than 0.50. The errors between simulation and
measurements of drainage and NO3
-N loss mainly reflected in March when temperature was low (average monthly
temperature was -4.1 oC), which may partially cause by drainage delay. Also the larger wind speed (4 m/s) which can take
away 20% of snow could affect our estimates. These results suggested that DRAINMOD-N II had good applicability in Iowa
and could simulate the long-term effect of winter rye cover crop on subsurface drainage and NO3
-N loss. Long-term
simulations (1990-2009) indicated that adding winter rye cover crop could reduce drainage, NO3
-N loss and FWANC by 8.1%
(2.5 cm), 16.6% (6 kg/hm2, by N) and 8.6% (1 mg/L, by N), respectively. The amount of drainage was decreased year by year
and the 5-yr dynamic reduction rates increased from 5% to 14%. The 5-yr dynamic NO3
-N loss varied between 4.1 and 7.3
kg/hm2, with a mean of 6.0 kg/hm2. The winter rye as a cover crop could increase evapotranspiration (ET) by 5.9% (2.6 cm),
and the time period to plant cover crop also affected ET increase. Planting cover crops before soybean ET increased by 6.4%.
Meanwhile, adding winter rye cover crop could increase crop N uptake by 7.3% (10.1 kg/hm2) and N fixation by 11.9% (11.3
kg/hm2). Planting winter rye could reduce net mineralization by 6.1% (10.4 kg/hm2), but it was in disagreement with the
existing experiments and simulations by the other researchers. These results indicated that there is still some debate about net
mineralization response to adding winter rye cover crop. Further research is necessary to understand the simulated nitrogen
transport and transformation mechanisms in soil. The field data is well matched with the calibrated model, showing that the
DRAINMOD-N II model could reliably simulate water and nitrogen movement in the soil. This model could simulate the
effect of different cropland management practices on subsurface drainage and nitrogen dynamics to optimizing cropland
management practice.

Keyword 排水 蒸散 玉米-大豆轮作系统 Drainmod-n Ii 冬季覆盖作物黑麦
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8492
Collection水保所知识产出(1956---)
Affiliation1.西北农林科技大学水利与建筑工程学院
2.西北农林科技大学中国旱区节水 农业研究院
3.Department of Agricultural and Biosystems Engineering, Iowa State University
4.中国科学院水利部水土保持研究所
5.Department of Bioresource Engineering, McGill University, Ste-Anne-de-Bellevue
Recommended Citation
GB/T 7714
杜 璇,冯浩,Matthew J. Helmers,等. DRAINMOD-N II 模拟冬季长期覆盖黑麦对 地下排水及NO3 -N 流失的影响[J]. 农业工程学报,2017,33(12):153-161.
APA 杜 璇,冯浩,Matthew J. Helmers,&齐志明.(2017).DRAINMOD-N II 模拟冬季长期覆盖黑麦对 地下排水及NO3 -N 流失的影响.农业工程学报,33(12),153-161.
MLA 杜 璇,et al."DRAINMOD-N II 模拟冬季长期覆盖黑麦对 地下排水及NO3 -N 流失的影响".农业工程学报 33.12(2017):153-161.
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