Modelling crop residue mulching effects on water use and production of maize under semi-arid and humid tropical conditions

Agronomie Pub Date : 2004-09-01 DOI:10.1051/AGRO:2004029
E. Scopel, Fernando-Antonio Macena Da Silva, M. Corbeels, F. Affholder, F. Maraux
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引用次数: 178

Abstract

A key principle of direct seeding mulch-based cropping systems is the retention of crop residues on the soil surface to preserve soil water for crop growth. In this study the impact of surface crop residue on water use and production risk associated with rainfall variability is analysed for two contrasting tropical sites. The two sites are La Tinaja in semi-arid Mexico and Planaltina in humid Brazil. The crop growth model STICS, version 3.0 was updated with a simple empirical module, incorporating the following effects of surface residue on soil water balance: (1) rainfall interception and subsequent mulch evaporation; (2) radiation interception with associated reduction of soil evaporation and (3) reduction of surface water runoff. The results of the model simulations showed that the effect of radiation interception at both sites was much more important than the effect of intercepting rain.[...]
模拟半干旱和湿润热带条件下作物残茬覆盖对玉米水分利用和产量的影响
直接播种覆膜耕作系统的一个关键原理是将作物残茬保留在土壤表面,为作物生长保留土壤水分。在这项研究中,地表作物残茬对用水的影响和与降雨变异相关的生产风险在两个对比的热带地区进行了分析。这两个地点分别是半干旱的墨西哥的La Tinaja和潮湿的巴西的Planaltina。对作物生长模型(3.0版)进行了更新,增加了一个简单的经验模块,纳入了地表残茬对土壤水分平衡的影响:(1)降雨截留和随后的地膜蒸发;(2)辐射拦截与相应的土壤蒸发减少和(3)减少地表水径流。模型模拟的结果表明,在这两个地点拦截辐射的效果比拦截降雨的效果重要得多。
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