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تاثیر سنگریزه بر نفوذ تجمعی در دو بافت مختلف خاک | ||
تحقیقات آب و خاک ایران | ||
دوره 55، شماره 12، اسفند 1403، صفحه 2483-2498 اصل مقاله (1.51 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2024.379854.669763 | ||
نویسندگان | ||
زیبا صدائی آذر؛ محمدحسین محمدی* ؛ حسین اسدی | ||
گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه تهران، استان البرز، ایران | ||
چکیده | ||
هدف از این مطالعه، بررسی اثر مقدار و اندازه سنگریزه بر نفوذ آب، در دو خاک لوم و لوم شنی بود. به این منظور، دو سری نمونه دستخورده با بافت زمینه لوم و لوم شنی و دارای مقادیر جرمی 10، 20، 30 و 40 درصد سنگریزه ریز (75/4-4 میلیمتر) و سنگریزه درشت (8/15-9/7 میلیمتر) و یک تیمار فاقد سنگریزه (شاهد) بهطور جداگانه تهیه شد. نمونههای خاک تهیه شده در ستونهای با ارتفاع 50 و قطر داخلی 5/21 سانتیمتر ریخته و متراکم شد و با استفاده از سیستم ماریوت، مقدار نفوذ تجمعی هر دو سری نمونه خاک اندازهگیری گردید. برای هر دو سری آزمایش، 10 ستون استفاده گردید. آزمایشهای نفوذ بدون تکرار انجام شد. حضور سنگریزه در هر دو خاک لوم شنی و لوم باعث افزایش نفوذ تجمعی نسبت به تیمار شاهد شد. مقدار متوسط نفوذ آب در تیمارهای لوم مخلوط با سنگریزه ریز و درشت به ترتیب، 25 و 104 درصد بیشتر از تیمارهای لوم شنی مخلوط با سنگریزه ریز و درشت بود. سنگریزه ریز در خاک لوم شنی و سنگریزه درشت در خاک لوم تاثیر بیشتری بر افزایش نفوذ تجمعی داشتند. با این حال، در مقدار سنگریزه 20 درصد، نوساناتی مشاهده شد. نتایج نشان داد که سنگریزه همیشه باعث افزایش مقدار نفوذ آب در خاک نمیشود. نتایج همچنین نشان داد که سنگریزه در هر دو خاک، با تاثیر بر مقدار جرمهای مخصوص ظاهری کل و بخش نرم خاک بر مقدار نفوذ تجمعی آب تاثیر میگذارد. | ||
کلیدواژهها | ||
تخلخل؛ جرم مخصوص ظاهری؛ جریان ترجیهی؛ منافذ درشت | ||
عنوان مقاله [English] | ||
The effect of gravel on the cumulative infiltration in two different soil textures | ||
نویسندگان [English] | ||
ziba sedayeeazar؛ Mohammad Hosein Mohammadi؛ hossein asadi | ||
Department of Soil Science Engineering; Faculty of Agriculture; Alborz Province;Iran | ||
چکیده [English] | ||
The objective of this study was to investigate the effect of content and size of gravel on water infiltration in two loam and sandy loam soils. For this purpose, two series of repacked soil samples, with loam and sandy loam textures, and mass contents of 10, 20, 30 and 40 % fine gravel (4-4.75) and coarse gravel (7.9- 15.8) mm, and a treatment with no gravel (CK) were created separately. The prepared soil samples were compacted into 50 cm high cylinders with an inner diameter of 21.5 cm. The cumulative infiltration of both series of soil samples were measured using the Marriott system. Regarding both series of experiments, 10 cylinders were used. The experiments of infiltration were done with no replication. The presence of the gravel increased the cumulative infiltration in both sandy loam and loam soils compared to the (CK). The average amount of water infiltration in loam treatments, combined with fine and coarse gravel were, respectively 25 and 104 percent, higher than the one in sandy loam treatments, combined with fine and coarse gravel. Fine gravel of sandy loam and coarse gravel of loam soils, had the highest effect on the increase of cumulative infiltration. However, some fluctuations were observed under the gravel content of 20 %. The results showed that the gravel does not always increase the amount of soil water infiltration. The results also indicated that the gravel affects the amount of water infiltration in both soils by affecting the total, and the fine earth bulk densities. | ||
کلیدواژهها [English] | ||
Keywords: Bulk density, Macro pores, Preferential flow, Porosity | ||
مراجع | ||
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