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首页> 外文期刊>Land Degradation and Development >Adapting to climate change by improving water productivity of soils in dry areas.
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Adapting to climate change by improving water productivity of soils in dry areas.

机译：通过提高干旱地区土壤的水分生产率来适应气候变化。

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Considering extreme events of climate change and declining availability of appropriate quality water and/or highly productive soil resources for agriculture in dryland regions, the need to produce more food, forage and fibre will necessitate the effective utilization of marginal-quality water and soil resources. Recent research and practices have demonstrated that effective utilization of these natural resources in dry areas can improve agricultural productivity per unit area and per unit water applied. This paper focuses on the following three case studies as examples: (1) low productivity soils affected by high levels of magnesium in soil solution and on the cation exchange complex; (2) degraded sandy soils under rainfed conditions characterized by low water-holding capacity, organic matter and clay content and (3) abandoned irrigated soils with elevated levels of salts inhibiting growth of income generating crops. The results of these studies demonstrate that application of calcium-supplying phosphogypsum to high-magnesium soils, addition of clays to light textured degraded soils and phytoremediation of abandoned salt-affected soils significantly improved productivity of these soils. Furthermore, under most circumstances, these interventions were economically viable, revealing that the efficient use of marginal-quality water and soil resources has the potential to improve livelihoods amid growing populations in dry areas while reversing the natural resource degradation trend. However, considerably more investment and policy-level interventions are needed to tackle soil degradation/remediation issues across both irrigated and dryland agricultural environments if the major challenge of producing enough food, forage and fibre is to be met.
机译：考虑到气候变化的极端事件以及旱地地区用于农业的适当质量的水和/或高产土壤资源的可用性下降，需要生产更多的粮食，饲料和纤维将需要有效利用边际质量的水资源和土壤资源。最近的研究和实践表明，在干旱地区有效利用这些自然资源可以提高单位面积和单位用水量的农业生产率。本文以以下三个案例研究为例：（1）受土壤中镁含量高的阳离子影响的低生产率土壤和阳离子交换复合物; （2）雨养条件下的退化沙质土壤，其持水能力，有机物和粘土含量低，（3）盐分含量较高的废弃灌溉土壤，抑制了创收作物的生长。这些研究的结果表明，在高镁土壤上施用供钙的磷石膏，在质地轻薄的退化土壤中添加粘土，以及对受盐污染的废弃土壤进行植物修复，可以显着提高这些土壤的生产力。此外，在大多数情况下，这些干预措施在经济上是可行的，这表明在干旱地区人口不断增长的同时，有效利用边际质量的水和土壤资源有可能改善生计，同时扭转自然资源退化的趋势。但是，如果要应对生产足够的粮食，草料和纤维的主要挑战，就需要在灌溉和旱地农业环境中解决土壤退化/修复问题的投资和政策一级的干预措施都需要更多。

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