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تغییرات مکانی ذخایر کربن آلی و غیر آلی در چند رده خاک جنگلی و مرتعی شمال ایران | ||
تحقیقات آب و خاک ایران | ||
مقاله 6، دوره 50، شماره 7، آذر 1398، صفحه 1651-1666 اصل مقاله (1.56 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2019.276186.668129 | ||
نویسندگان | ||
مریم اوسط1؛ احمد حیدری* 2 | ||
1استادیار بخش تحقیقات علوم زراعی-باغی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان کردستان، سازمان تحقیقات، آموزش و ترویج کشاورزی، سنندج، ایران | ||
2استاد گروه علوم و مهندسی خاک، دانشگاه تهران، ایران | ||
چکیده | ||
بررسی تغییرات مکانی کربن آلی خاک در کاربریهای مختلف، کمک شایانی در تفسیر و شبیهسازی رفتار اکوسیستمهای خاکی در مواجهه با تغییرات اقلیمی و زیستمحیطی میکند. اراضی تپهای و شیبدار روستای باندر به دلیل اکوسیستم منحصر به فرد و تأثیر شیب در ایجاد خرد اقلیمها و تغییرات پوشش گیاهی، از اهمیت خاصی برخوردار است. تغییرات مکانی میزان محتوا و ذخیره کربن آلی و غیرآلی خاک در اعماق مختلف مورد مطالعه قرار گرفت. تأثیر نوع کاربری اراضی، مواد مادری، ویژگیهای توپوگرافی و برخی از ویژگیهای خاک نیز بر روی میزان محتوا و ذخیره کربن آلی و غیرآلی خاک در 56 خاکرخ بررسی شد. به طور متوسط بیشترین میزان ذخایر کربن آلی و غیرآلی خاک (Mg/ha6/196=SOC، Mg/ha2/88=SIC) در مالیسولها و کمترین مقادیر در انتیسولها (Mg/ha 9/59=SOC، 3/11=SIC) به دست آمد. بیشترین میزان ذخیره کربن کل نیز به طور متوسط در مالیسولها 9/284 Mg/ha و کمترین آن در انتیسولها 2/71 Mg/ha به دست آمد. همبستگی بین ذخایر کربن آلی و غیرآلی خاک نشان دهنده آن است که کربن غیر آلی خاک در این منطقه از کربن آلی سرچشمه میگیرد. در کاربری جنگل قسمت اعظم ذخایر کربن آلی خاک در افقهای سطحی قرار داشته و کربن آلی آن نیز بیشتر از نوع تازه و نیمه تجزیه شده و در ارتباط با جزء سیلت خاک میباشد. بنابراین خاکهای جنگلی نسبت به خاکهای مرتعی که قسمت اعظم کربن آلی آنها در افقهای زیرسطحی و در ارتباط با جزء رس خاک قرار دارد، در پاسخ به تغییر کاربری و اقدامات مدیریتی شکنندهتر میباشد. | ||
کلیدواژهها | ||
کربن آلی؛ کربن غیرآلی؛ تغییرات مکانی؛ جنگل؛ مرتع | ||
مراجع | ||
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