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مروری بر تأثیر اقلیم و تحول خاک بر منابع ذخیره کربن آلی خاک در البرز مرکزی | ||
تحقیقات آب و خاک ایران | ||
دوره 52، شماره 12، اسفند 1400، صفحه 2935-2949 اصل مقاله (1.07 M) | ||
نوع مقاله: مروری | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2021.330447.669073 | ||
نویسندگان | ||
علیرضا راهب* 1؛ احمد حیدری2 | ||
1استادیار گروه علوم و مهندسی خاک-پردیس کشاورزی و منابع طبیعی دانشگاه تهران | ||
2استاد گروه علوم و مهندسی خاک پردیس کشاورزی و منابع طبیعی دانشگاه تهران | ||
چکیده | ||
تغییرات کربن خاک یکی از مهمترین شاخصهای نشاندهنده تاثیر اقلیم بـر گونههای خـاک اسـت. مدیریت کربن آلی خاک، نیازمند آگاهی از مقدار آن و شناخت عوامل مؤثر بر آن میباشد. در این پژوهش برخی ویژگیهای خاک به ویژه کربن آلی در 76 خاکرخ در اقلیمهای مختلف متشکل از خشک (استان البرز)، نیمهخشک (استان البرز و استان قزوین) و نیمهمرطوب (استان گیلان و مازندران) و مرطوب (استان مازندران) با رژیمهای رطوبتی اریدیک، زریک و یودیک و رژیمهای حرارتی ترمیک و مزیک مورد مطالعه قرار گرفتند. تغییر در پارامترهای اقلیمی سبب ایجاد تغییر تنوع گونهها در اکوسیستم شده و در نهایت بر روی اشکال مختلف کربن به ویژه کربن آلی خاک موثر بوده است. از مهمترین عوامل اقلیمی در این مطالعه میتوان به دما اشاره نمود که افزایش دمای خاک منطقه خشک و نیمهخشک نسبت به دو منطقه مرطوبتر سبب تشدید معدنیشدن شده و در نتیجه آن کربن آلی خاک کاهش مییابد. نتایج نشان داد که مقدار کربن آلی در خاک مناطق مورد مطالعه با افزایش عمق کاهش مییابد و میانگین مقدار کربن آلی در خاکرخهای مالیسول بیشتر از آلفیسولها، اینسپتیسولها، انتیسولها و اریدیسولها بوده است. نتایج کلی این مطالعه نشان میدهد افزایش پارامترهای هدایت الکتریکی خاک (شوری)، اسیدیته خاک و مقدار رس اثر منفی بر میزان کربن آلی خاک، در حالی که افزایش پارامترهای ظرفیت تبادل کاتیونی و مقدار سیلت خاک اثرات مثبت بر آن دارند. | ||
کلیدواژهها | ||
انتیسول؛ کربن آلی؛ اقلیم نیمهخشک؛ تشکیل خاک | ||
مراجع | ||
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