تغييرات مكاني فرسايش پذيري ذاتي خاك در مقابل باد در دشت تبريز

Spatial variability of soil inherent wind erodibility

اين مطالعه به منظور بررسي تغييرات مكاني فرسايش‌پذيري بادي خاك در دشت تبريز واقع در استان آذربايجان شرقي صورت پذيرفت. به اين منظور 42 نمونه خاك از عمق صفر تا 10 سانتي‌متري سطح خاك در يك شبكه نمونه‌برداري ‌آشيانه‌اي- شبكه‌بندي شده با فواصل 150، 300 و 600 متري تهيه شد. برخي از خواص خاك مانند توزيع اندازه خاكدانه‌ها و سرعت آستانه فرسايش بادي و فرسايش‌پذيري ذاتي خاك تعيين گرديد. سپس ﺗﻐﻴﻴﺮﭘﺬﻳﺮي ﻣﻜﺎني ويژگي‌هاي اندازه‌گيري شده ﺑﺎ اﺳﺘﻔﺎده از ﻧﺴﺒﺖ وابستگي مكاني ﻣﻮرد ﺑﺮرﺳﻲ ﻗﺮار ﮔﺮﻓﺖ. نتاﻳﺞ ﻧﺸﺎن داد كه اﻟﮕﻮي گوسي و الگوي نمائي به ترتيب ﺑﻬﺘﺮﻳﻦ ﻣﺪل ﺑﺮازش داده ﺷﺪه ﺑﺮاي واريوگرام ﻋﺎﻣﻞ ﻓﺮﺳﺎﻳﺶﭘﺬﻳﺮي خاك و ذرات فرسايش‌پذير ﻣـﻲ‌ﺑﺎﺷـﺪ و داﻣﻨـﻪ تاثير ﺑـﺮاي ويژگي ﻓﺮﺳﺎﻳﺶ‌پذيري خاك 2989 متر بوده و اين ويژگي داراي واﺑﺴﺘﮕﻲ ﻣﻜﺎﻧﻲ متوسط مي‌باشد.

This study was conducted to investigation of spatial variability of the wind erodibility of soil and its related soil properties, in Tabriz Plain which was located in east Azerbaijan province of Iran. For this reason 42 soil samples at 0-10 cm of soil depth at a nested- systematic design with a distance about 150, 300 and 600 meters from each other were collected. Some soil properties such as primary soil particles, aggregates size distributions, threshold velocity of soil erosion by wind and soil inherent wind erodibility were determined. Then spatial variability of the determined soil properties was investigated by the spatial correlation analysis. Results showed that the Gaussian and Exponential models are the best models for semivariogram of the soil erodibility factor and erodible particles fraction, respectively. The range of the semivariogram for soil erodibility was 2989 meters, which it represents moderate spatial correlation.