Assessment of the soil-protecting services of the forest ecosystem: a case study in Ilam catchment, Iran

Q4 Agricultural and Biological Sciences

Forestry Studies Pub Date : 2023-11-01 DOI:10.2478/fsmu-2023-0003

Ali Mahdavi, Elham Motaharfard

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引用次数: 0

Abstract

Abstract The natural forests of western Iran play a key role in delivering services and goods to local society. Nonetheless, this forest ecosystem, despite its importance, is threatened by natural factors and anthropogenic activities, resulting in decreasing soil quality and soil erosion. The present research aimed to assess the effects of the forest ecosystems on soil erosion control in Ilam catchment in southwest Iran. For this purpose, after estimating the soil loss in natural conditions (NC), we predicted the amount of soil erosion under two scenarios: (i) convert natural forest with 20% canopy cover to destructed forest with 0% canopy cover (SC.1), (ii) increase forest cover by 40% (SC.2). Our results indicate that the estimated mean soil erosion was within the range of 9.36 t ha -1 yr -1 in irrigated and garden use to about 256 t ha -1 yr -1 in bare soils under NC. We found that when converting natural forest to destructed forest, the mean annual soil erosion rate increased 105.75 t ha -1 yr -1 , 118.1 t ha -1 yr -1 , and 19.57 t ha -1 yr -1 in the dense forest, sparse forest, and Agri-Forest use, respectively. These results show the protective effect of the forest against soil erosion.

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森林生态系统的土壤保护功能评估:以伊朗Ilam流域为例

伊朗西部的天然森林在为当地社会提供服务和商品方面发挥着关键作用。然而，尽管这一森林生态系统具有重要意义，但受到自然因素和人为活动的威胁，导致土壤质量下降和土壤侵蚀。本研究旨在评估伊朗西南部Ilam流域森林生态系统对土壤侵蚀控制的影响。为此，在估算自然条件下的土壤流失量(NC)后，我们预测了两种情景下的土壤流失量:(i)将覆盖度为20%的天然林转化为覆盖度为0%的破坏林(SC.1)， (ii)将覆盖度增加40% (SC.2)。结果表明，在灌溉和园地利用条件下，估算的平均土壤侵蚀量在9.36 tha -1 yr -1至256 tha -1 yr -1之间。研究发现，天然林向毁林转化后，密林、疏林和农林复合利用的年均土壤侵蚀速率分别增加105.75、118.1和19.57 tha -1 yr。这些结果显示了森林对土壤侵蚀的保护作用。

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来源期刊

Forestry Studies Agricultural and Biological Sciences-Forestry

CiteScore

0.70

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0.00%

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