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首页> 外文期刊>Arid Land Research and Management >Comparison of Soil Physical, Chemical, and Biochemical Properties Among Native Forest, Maintained and Abandoned Almond Orchards in Mountainous Areas of Eastern Spain
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Comparison of Soil Physical, Chemical, and Biochemical Properties Among Native Forest, Maintained and Abandoned Almond Orchards in Mountainous Areas of Eastern Spain

机译：西班牙东部山区原生林，维护和废弃杏仁园土壤理化性质的比较

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摘要

In the mountainous areas of Eastern Spain, soils have been cultivated in terraced orchards for centuries, although in the last decades, almond orchards are being abandoned. For this study, we selected four locations in SE Spain, with a similar vegetation mosaic, constituting forest, almond tree orchards, and orchards abandoned between 10 to 15 years previous to sampling. The main objective was to investigate the effects of changes in land use from forest to agricultural and posterior land abandonment on various physical, chemical, and biochemical properties. In all locations, all properties showed the highest values in forest soils, excepting pH and some eco-physiological ratios which were lowest under this land use. Abandoned agricultural soils showed a slight recovery in some properties compared to agricultural soils, the biochemical properties being the most sensitive indicators in reflecting these changes. All these results indicate that after land abandonment, soil microorganisms are more active as a consequence of the increment in the vegetation cover, with higher inputs as litter and root exudates. Moreover, the stopping of tillage may also have favored the increments in microbial biomass and activity. Nonetheless, these values are still low compared to forest soils, reflecting that 10-15 years of abandonment is not long enough to achieve a significant recovery in soil properties under semi-arid Mediterranean conditions. The metabolic quotient (qCO2) showed no general pattern in all locations in terms of land use, suggesting that this ratio is not specific enough to be used as an indicator in ecosystem succession.
机译：在西班牙东部的山区，梯田果园里耕种土壤已有数百年之久，尽管在过去的几十年里，杏仁果园也被废弃了。对于本研究，我们选择了西班牙东南部的四个地点，这些地点具有相似的植被马赛克，构成了森林，杏仁树果园和在采样前10至15年之间废弃的果园。主要目的是研究从森林到农业以及后土地废弃的土地利用变化对各种物理，化学和生化特性的影响。在所有地点，除pH值和某些生态生理比值在该土地利用条件下最低之外，所有特性在森林土壤中均显示最高值。与农业土壤相比，废弃的农业土壤在某些性质上略有恢复，生化性质是反映这些变化的最敏感指标。所有这些结果表明，土地被遗弃后，由于植被覆盖的增加，土壤微生物更加活跃，而凋落物和根系分泌物的投入更高。此外，耕作的停止可能也有利于微生物生物量和活性的增加。但是，与森林土壤相比，这些值仍然很低，这表明在半干旱的地中海条件下，放弃10-15年还不足以使土壤性质显着恢复。就土地利用而言，代谢商（qCO2）在所有地区均未显示出一般模式，这表明该比率不够具体，不足以用作生态系统演替的指标。

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