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首页> 外文会议>Sustainable irrigation and drainage IV: Management, technologies and policies >Drip versus surface irrigation in long term environmental modelling of soil-water-plant exposed to saline water
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Drip versus surface irrigation in long term environmental modelling of soil-water-plant exposed to saline water

机译：暴露于盐水的土壤-水-植物的长期环境模型中的滴灌与地面灌溉

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A physically based soil-water storage model with two surface and drip irrigation scenarios in response to saline water was used in the semi-arid Gordonia district in South Africa. The model (CoupModel) consists of several different modules that couples mass and energy flow models with dynamic biotic models of plant and its environment. The simulation period accounted for non-productive water losses, salt accumulation in root zone, and salt transport to below aquifer via deep percolation. The monitoring of biomass production with respect to water consumption and soil osmotic pressure indicted a decline in crop yield due to the water and salt stresses. The drip scenario had a better functionality in terms of the water wastage as the soil evaporation decreased by 40%. However, the productive water consumption decreased by 20% due to insufficient leaching fraction while salt accumulation increased drastically in the entire root zone. We found that salt could be flushed out from the root zone by more leaching but the water wastage increases as well as increasing the possibility of salinization beneath aquifer. The soil-water and plant ecosystem responds differently to salinity in different water management practices. Salt as a source of pollution can either stabilizes the soil by accumulation in the root zone causing anthropogenic soil desertification or can percolate it to beneath the aquifer resulting to long-term salinization. The findings of our study could sever to improve different management schemes in similar semi-arid regions.
机译：在南非的半干旱戈登尼亚地区，使用了基于物理的土壤-水存储模型，该模型具有两种地表灌溉和滴灌对盐水的响应方式。该模型（CoupModel）由几个不同的模块组成，这些模块将质量和能量流模型与植物及其环境的动态生物模型耦合。模拟期考虑了非生产性水分流失，根区盐分积聚以及盐分通过深层渗滤运至含水层以下的问题。关于水消耗和土壤渗透压的生物量生产监测表明，由于水分和盐胁迫，农作物产量下降。由于土壤蒸发减少了40％，因此滴灌方案在水浪费方面具有更好的功能。但是，由于浸出率不足，生产用水量减少了20％，而整个根区的盐分累积却急剧增加。我们发现，通过更多的淋洗可以将盐从根部冲洗掉，但是水的浪费增加了，并且增加了含水层下盐碱化的可能性。在不同的水管理实践中，土壤-水和植物生态系统对盐分的反应不同。盐作为污染源，可以通过在根区中积累而导致人为土壤荒漠化来稳定土壤，也可以将其渗透到含水层之下，从而导致长期盐渍化。我们研究的结果可能会严重改善类似半干旱地区的不同管理方案。

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