Journal of Water and Soil Science
علوم آب و خاک
jwss
Agriculture
http://jstnar.iut.ac.ir
0
user
2476-3594
2476-5554
10.47176/jwss
fa
jalali
1398
9
1
gregorian
2019
12
1
23
3
online
1
fulltext
fa
تعیین رطوبت بحرانی برخی خاکهای آبگریز مرغزار شهرکرد
Assessing Relation of Soil Hydrophobicity and Soil Water Content and Determining Threshold Moisture of Organic Soil Samples
عمومی
Ggeneral
پژوهشي
Research
<div style="text-align: justify;"><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">مقدار رطوبت خاک، حساس</span></span></span></strong><strong><span style="color:black;"><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;"></span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ترین</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">فاکتور</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">مرتبط</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">با</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">تغییرات</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آبگریزی</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">و</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آبدوستی</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">خاک</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">است</span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">. </span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آبگریزی</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">در</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">خاک</span></span></span></strong><strong><span style="color:black;"><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;"></span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ها</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">یک</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ویژگی</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">دائمی</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">نیست و</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">این</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">امکان</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">وجود</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">دارد</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">که</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">در</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">فصل</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">خشک</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">به</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">حداکثر</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">برسد</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">و</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">در</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">فصل</span></span></span></strong><strong><span style="color:black;"><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;"></span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">های</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">مرطوب</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">کاهش</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">یابد</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">یا</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">حذف</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">شود</span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">. </span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">می</span></span></span></strong><strong><span style="color:black;"><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;"></span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">توان</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">گفت</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">از</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">لحاظ</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">رطوبت،</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">یک</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ناحیه</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">انتقالی</span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;"> یا بحرانی وجود دارد که بهعنوان حد رطوبتی یا رطوبت آستانه تعریف می</span></span></span></strong><strong><span style="color:black;"><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;"></span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">شود</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">و</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">در</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">رطوبت</span></span></span></strong><strong><span style="color:black;"><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;"></span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">های</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">کمتر</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">از</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آن،</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">دفع</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آب</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">و</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">در</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">رطوبت</span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;"></span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">های</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">بالاتر</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">از</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آن</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">خاک</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">خیس</span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;"></span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">شونده</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">است</span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">. </span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">هدف</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">از</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">این</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">پژوهش،</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">بررسی</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">تغییرات</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">رطوبت</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">خاک</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">بر</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">درجه</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آبگریزی</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">و</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">تعیین</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">مقدار</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">رطوبت</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آستانهای</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">در</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">نمونه</span></span></span></strong><strong><span style="color:black;"><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;"></span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">های</span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;"> خاک مورد بررسی در مرغزار شهرکرد بود. در این پژوهش، تعدادی نمونه خاک از مرغزار شهرکرد بررسی شد. پس از تعیین رطوبت اولیه خاک، شرایط آبگریزی خاک با تعیین زمان نفوذ قطره </span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آب</span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;"> (</span></span></span></strong><strong><span dir="LTR"><span style="color:black;"><span style="font-size:9.0pt;">WDPT</span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">)، بررسی شد. تغییرات رطوبتی خاک به روش خیس کردن و خشک کردن خاک انجام و در هر مرحله وضعیت آبگریزی خاک آزمون شد. کاهش رطوبت در خاک</span></span></span></strong><strong><span style="color:black;"><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;"></span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">های</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آبگریز</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">منجر</span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;"></span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">به</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">تغییر</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">درجه</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آبگریزی</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">و</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">در</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">یک</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">نمونه</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">خاک</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آبدوست</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">باعث</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ایجاد</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">شرایط</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آبگریزی</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">در</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">خاک</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">شد</span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">. </span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">رطوبت</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آستانه</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">نیز،</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">تا</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">حداکثر</span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;"> 54 </span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">درصد</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">رطوبت</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">حجمی</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">در</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">یک</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">نقطه</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">مورد</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">بررسی،</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">مشاهده</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">شد</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">که</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">بر </span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;"></span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">اس</span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">اس آن، مقدار بالای رطوبت آستانه در این نقطه، نشاندهنده </span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">قابلیت</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">بالای</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">خاک</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">برای</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">تولید</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">رواناب</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">و</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">سیلخیزی</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">بود</span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">. </span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">بررسی</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آنالیز</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">خاک</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">نشان</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">داد</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">که</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">مقدار</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ماده</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آلی</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">خاک</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">با</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">رطوبت</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آستانه</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">همبستگی</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">مثبت</span></span></span></strong> <strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">دارد</span></span></span></strong><strong><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;">.</span></span></span></strong><strong><span style="letter-spacing:-.1pt;"><span style="color:black;"><span style="font-family:b lotus;"><span style="font-size:11.0pt;"></span></span></span></span></strong></div>
<div style="text-align: justify;">Soil water content is the most effective factor associated with the hydrophobic and hydrophilic changes in a soil. Water repellency in soils, is not a permanent feature; it can be reached in the dry season and reduced or eliminated in the wet season It can be said that in terms of moisture, there is a critical region that is defined as the threshold moisture content, where in lower moisture, the soil is repellent and in higher moisture, the soil is wet able. The purpose of this study was to investigate soil moisture variations on degree of hydrophobicity and determine the amount of threshold water content in soil samples of wetland around Shahr-e-Kord. In this study, some samples of Shahr- e-Kord wetland were investigated. After determining the initial moisture content of the soil, the soil hydrophobicity conditions were determined by determining the time of water droplet penetration (WDPT). Soil moisture variations were carried out using soil wetting and drying method, and in each step the soil hydrophobicity conditions were tested. Reducing water content in soil samples, led to a change in the degree of hydrophobicity in hydrophobic samples, in one soil hydrophilic soil sample, Reducing water content changed hydrophilic soil to hydrophobic soil. The threshold water content was also observed up to a maximum of 54% volumetric water content at a given point. Based on this, the higher moisture content of the threshold at this point indicates the higher soil potential for runoff generation. Soil analysis showed that soil organic matter had a positive correlation with threshold water content.</div>
آبگریزی, رطوبت آستانه, ماده آلی خاک, مرغزار شهرکرد
Repellent soil, Threshold water content, Soil organic matter, Shahrekord wetland
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http://jstnar.iut.ac.ir/browse.php?a_code=A-10-3907-1&slc_lang=fa&sid=1
R.
Mousavi Zadeh Mojarad
ریحانه السادات
موسوی زاده مجرد
rey.mousavi@gmail.com