fa تأثیر درجه شیب و ویژگی‌های فیزیکی خاک بر هدررفت خاک از نوارهای کشت دیم تخصصي Special پژوهشي Research <strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">این مطالعه به &shy;منظور بررسی تأثیر درجه شیب و ویژگی&shy;های <span style="color:black;">فیزیکی خاک </span>روی فرسایش شیاری در جویچه &shy;های کشت</span></span></strong><strong><span style="font-family:Times New Roman,serif;"><span style="font-size:12.0pt;">&shy;</span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">زارهای دیم تحت شرایط آیش انجام شد. جویچه&shy; هایی با طول </span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">6</span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> متر در پنج کشت</span></span></strong><strong><span style="font-family:Times New Roman,serif;"><span style="font-size:12.0pt;">&shy;</span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">زار با شیب &shy;های </span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">6، 11، 15، 21 و 27 درصد در سه تکرار احداث شدند. نتایج نشان داد که فرسایش شیاری بین پنج </span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">کشت</span></span></strong><strong><span style="font-family:Times New Roman,serif;"><span style="font-size:12.0pt;">&shy;</span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">زار</span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> تفاوتی معنی&shy; دار دارد. همبستگی معنی‌داری بین فرسایش شیاری و درجه شیب یافت نشد، در حالی&shy;که فرسایش شیاری</span></span></strong> <strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">به &shy;طور معنی&shy; داری </span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">تحت تأثیر</span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> برخی ویژگی&shy; های خاک شامل </span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">شن </span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">(05 /</span></span></strong><strong><span style="font-family:Times New Roman,serif;"><span style="font-size:10.0pt;">0</span></span></strong><strong><span dir="LTR"><span style="font-family:Times New Roman,serif;"><span style="font-size:10.0pt;">P<</span></span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">)،</span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> رس </span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">(05 /</span></span></strong><strong><span style="font-family:Times New Roman,serif;"><span style="font-size:10.0pt;">0</span></span></strong><strong><span dir="LTR"><span style="font-family:Times New Roman,serif;"><span style="font-size:10.0pt;">P<</span></span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">)</span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> و پایداری خاک&shy;دانه </span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">(05/&nbsp;</span></span></strong><strong><span style="font-family:Times New Roman,serif;"><span style="font-size:10.0pt;">0</span></span></strong><strong><span dir="LTR"><span style="font-family:Times New Roman,serif;"><span style="font-size:10.0pt;">P<</span></span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">) </span></span></strong><strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">قرار گرفت.</span></span></strong> <strong><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"></span></span></strong> <div style="text-align: justify;"> <p style="margin: 0cm 0cm 12pt; text-align: justify; line-height: normal; text-indent: 7.1pt;"><span new="" style="color: black; font-family:;" times="">This study was conducted to investigate the effect of slope gradient and soil physical properties </span><span b="" new="" style="color: black; font-family:;" times="">(grain size distribution, bulk density, aggregate stability and permeability) on water erosion </span><span new="" style="color: black; font-family:;" times="">in the furrows of </span><span b="" new="" style="color: black; font-family:;" times="">rainfed farms</span><span new="" style="color: black; font-family:;" times=""> under fallow conditions. The furrows with 6 m length were installed in five rainfed farms with 6.1, 10.6, 14.8, 20.7 and 27.1% slope steepness at </span><span new="" style="color: black; font-family:;" times="">three replications. Results indicated that rill erosion were significantly varied among the five farms. There was no significant correlation between rill erosion and slope gradient, while it was significantly affected by some soil properties consisted of sand (P<0.05), clay (P<0.05) and aggregate stability (P<0.05). </span><span new="" style="color: black; font-family:;" times="">These results revealed that in coarse textured farms with different slope gradient, soil loss through furrows isn&rsquo;t significantly related to slope gradient, but it is significantly affected by soil physical properties. </span></p> </div> جریان متمرکز, نوار کشت, ویژگی‌های خاک Concentrated flow, Cultivation furrow, Soil properties 93 96 http://jwmsei.ir/browse.php?a_code=A-10-124-7&slc_lang=fa&sid=1 Ali Reza Vaezi علی رضا واعظی vaezi.alireza@gmail.com 100319475328460014595 100319475328460014595 Yes Full Professor of Department of Soil Science, Agriculture Faculty, University of Zanjan, Iran. استاد، گروه خاکشناسی، دانشگاه زنجان، ایران. Zahra Haghani زهرا حقانی 100319475328460014596 100319475328460014596 No M.Sc. Graduate, Soil Science Department, Faculty of Agriculture, University of Zanjan. Iran. دانش آموخته کارشناسی ارشد فیزیک و حفاظت خاک دانشگاه زنجان، ایران.