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اثرات مدیریت زراعی دراز مدت در تشکیل سخت لایه شخم: پیامدهای آن بر ویژگی‌های فیزیکی و شیمیایی خاک | ||
| تحقیقات آب و خاک ایران | ||
| دوره 54، شماره 1، فروردین 1402، صفحه 33-48 اصل مقاله (1.59 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2023.352817.669418 | ||
| نویسندگان | ||
| علیرضا راهب* 1؛ احمد حیدری2 | ||
| 1استادیار گروه علوم و مهندسی خاک- دانشکده کشاورزی-دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران | ||
| 2استاد گروه علوم و مهندسی خاک دانشکده کشاورزی، دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران-کرج | ||
| چکیده | ||
| فشردگی خاک و تشکیل سخت لایه شخم در خاک‌های کشاورزی ایران به یک معضل جدی تبدیل شده که بهره‌وری منطقه را تهدید می‌کند. تشکیل سخت‌لایه شخم به دلیل کاربرد درازمدت ادوات خاک‌ورزی در یک عمق ثابت، پیامد مهم شیوه خاک‌ورزی مرسوم در اراضی زراعی است که رشد محصول را کاهش می‌دهد. برای اثبات وجود سخت‌لایه شخم و درک نقش آن بر ویژگی‌های فیزیکی و شیمیایی خاک، 32 خاکرخ (8 خاکرخ در هر منطقه) در چهار استان قزوین، گلستان، مرکزی و خوزستان با اقلیم نیمه‌خشک حفر، تشریح و نمونه‌برداری گردید. در هر چهار منطقه و در 70 درصد از خاکرخ‌ها، سخت‌لایه شخم با ضخامت متوسط 24 سانتی‌متر در 16 تا 64 سانتی‌متری زیر سطح خاک مشاهده شد. در سخت‌لایه شخم نسبت به سایر افق‌ها مقدار تخلخل کل خاک از 7 تا 19% کاهش و میزان جرم مخصوص ظاهری خاک بین 5 تا 14% افزایش داشت. عمق تشکیل این لایه و گسترش عمودی آن و همچنین شدت تراکم آن در خاک‌های مناطق مختلف، متفاوت بوده است. وجود سخت لایه شخم (به‌غیر از منطقه آبیک قزوین) باعث تجمع 14 تا 40 درصدی املاح محلول و ایجاد یک لایه نسبتا شور در زیر افق سطحی (Ap) شده بود. مهمترین دلیل متراکم بودن سخت‌لایه شخم در منطقه زراعی گنبد نسبت به سه منطقه دیگر، بالا بودن میانگین درصد سیلت (حدود 60 درصد) در این منطقه بود. در کنار اثر بافت خاک، غالب بودن روش آبیاری غرقابی در هر چهار منطقه علی‌رغم خشک بودن اقلیم نیز باعث تشدید تراکم و غیرقابل نفوذ شدن سخت‌لایه شخم به ویژه در مناطق زراعی استان‌های گلستان، خوزستان و مرکزی شده است، زیرا شخم سالانه در اعماق ثابت در کنار آبیاری سنگین با حجم زیاد آب، سبب شستشوی ذرات رس و سیلت از سطح خاک و تجمع در عمق متراکم شده می‌گردد. | ||
| کلیدواژه‌ها | ||
| آبیاری؛ امنیت غذایی؛ تخریب خاک؛ کاهش عملکرد؛ مناطق نیمه‌خشک | ||
| عنوان مقاله [English] | ||
| Long-term crop management and formation of plow pan: its consequences on soil physico-chemical properties | ||
| نویسندگان [English] | ||
| Alireza Raheb1؛ Ahmad Heidari2 | ||
| 1Assistant Professor, soil science department Faculty of Agriculture, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran | ||
| 2Professor, soil science department Faculty of Agriculture, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran | ||
| چکیده [English] | ||
| Soil compaction and formation of plow pan in Iranian agricultural soils became a serious problem, which threatens regional productivity. The formation of plow pan due to the long-term use of tillage tools at a constant depth, is a common consequence of conventional tillage, which limits crop growth. In order to prove the existence of plow pan and its effect on physical and chemical soil characteristics, 32 soil profiles (eight soil profiles in each region) were analyzed in Qazvin, Golestan, Markazi and Khuzestan provinces. In all four regions and in 70% of the soils, plow pan with an average thickness of 24 cm was observed at 16 to 64 cm below the surface. Total porosity and the amount of bulk density showed respectively about 7-19% decrease and 5-14% increase in the plow pan compared to other horizons. The depth of the formation of this layer and its vertical expansion as well as the intensity of compaction in the soils of the studied areas have been different. The presence of the plow pan (except for Abyek region of Qazvin) had caused the accumulation of 14 to 40% of dissolved salts and the creation of a relatively saline layer under the surface horizon (Ap). The most important reason for the high compaction of the plow pan in the Gonbad agricultural area compared to the other three areas, was the high average percentage of silt (about 60%) in this area. In addition to the effect of soil texture, the predominance of submerged irrigation, despite the aridity of the climate, intensifies the compaction and resistance to root penetration especially in the agricultural areas of Golestan, Khuzestan and Markazi provinces, because annual plowing at constant depths along with heavy irrigation with a large volume of water leads to the eluviation of clay and silt particles from the surface and illuviation in depth. | ||
| کلیدواژه‌ها [English] | ||
| Irrigation, Food Security, Semi-Arid Regions, Sustainable Agriculture, Yield reduction | ||
| مراجع | ||
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