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The soil interpretation for \u2018Land Degradation\u2019 evaluates the soil factors that imply the presence of a soil condition that may be limiting to plant growth. Categorizing land degradation in a highly eroded and eroding desert environment is problematic. Thus the evaluation presented here has been developed through a consultative process to obtain a consensus of important factors in this environment. The evaluation deviates from conventional assessments of land degradation that usually consider either the soil\u2019s risk (vulnerability) to erosion and degradation under a given set of circumstances (e.g. irrigated agriculture), or the level of degradation that has occurred as a result of human intervention. In this case the evaluation accounts for long-term natural factors that have led to the land being in a relatively degraded state. Thus a saline soil is considered to be degraded even though this may now be considered its natural condition. Similarly a surface lag of gravels is evidence that erosion has happened in the past. The soils may now be stabilized by this surface cover and erosion may no longer occur though the current evaluation would show them as being degraded. In contrast the dune systems that are by definition evidence of soil particle mobility are evaluated as having no degradation. The ratings are for soils in their natural condition; however they also take present land use into consideration by considering land under forestry or agriculture as being protected and so not degraded. || تفسير التربة لـ \"تدهور الأراضي\" يقوم بتقييم العوامل التي تشير إلى وجود حالة في التربة قد تحد من نمو النباتات. يعتبر تصنيف تدهور الأراضي في بيئة صحراوية شديدة التآكل وتتعرض للتآكل مشكلة معقدة. لذلك، تم تطوير التقييم المعروض هنا من خلال عملية استشارية للوصول إلى توافق حول العوامل المهمة في هذه البيئة.<\/SPAN><\/P>

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يختلف هذا التقييم عن التقييمات التقليدية لتدهور الأراضي التي تأخذ عادةً في الاعتبار إما خطر (قابلية) التربة للتآكل والتدهور تحت ظروف معينة (مثل الزراعة المروية)، أو مستوى التدهور الذي حدث نتيجة التدخل البشري. في هذه الحالة، يأخذ التقييم بعين الاعتبار العوامل الطبيعية طويلة الأجل التي أدت إلى أن تكون الأرض في حالة تدهور نسبي.<\/SPAN><\/P>

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لذلك، تعتبر التربة المالحة متدهورة حتى لو كان يُنظر إلى هذه الحالة الآن على أنها وضعها الطبيعي. وبالمثل، فإن وجود طبقة سطحية من الحصى دليل على حدوث تآكل في الماضي. قد تكون التربة الآن مستقرة بسبب هذا الغطاء السطحي ولا يحدث تآكل حاليًا، ولكن التقييم الحالي سيُظهرها على أنها متدهورة.<\/SPAN><\/P>

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في المقابل، يتم تقييم أنظمة الكثبان الرملية، التي تُعد دليلًا على حركة جزيئات التربة بحكم تعريفها، على أنها غير متدهورة.<\/SPAN><\/P>

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