تأثیر خصوصیات فیزیکی و شیمیایی خاک بر خشکیدگی درختان سرو نقرهای (Cupressus arizonica L.) (مطالعه موردی: جنگل کاری شرق اصفهان) | ||
| خشک بوم | ||
| مقاله 5، دوره 6، شماره 1، فروردین 1395، صفحه 57-68 اصل مقاله (371.04 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| نویسندگان | ||
| شادی گرجستانی زاده* ؛ علی سلطانی؛ حسین شریعتی نجف آبادی | ||
| دانشگاه شهرکرد | ||
| چکیده | ||
| خشکیدگی درختان سرونقرهای در جنگلکاریهای شرق اصفهان در سالهای اخیر درحال افزایش است. علت اصلی این خشکیدگی کمبود آب و خشکسالیهای اخیر قلمداد میشود. با این حال عدم یکنواختی نرخ خشکیدگی در نواحی مختلف احتمال دخالت سایر عوامل را قوت میدهد. در این تحقیق تاثیر خصوصیات فیزیکی و شیمیایی خاک بر نرخ خشکیدگی درختان سرو نقرهای بررسی میشود. منطقه جنگلکاری مورد مطالعه را میتوان بر اساس تنشهای محیطی مرتبط به چهار ناحیة جداگانه تفکیک کرد: 1) مجاورت با مراکز جمعیتی؛ 2) مجاورت با راههای ارتباطی؛ 3) بیشترین فاصله از مناطق با توان بالای تنشزایی و 4) مجاورت با منطقه صنعتی. در هر پلات تمام درختان شامل درختان سالم، درحال خشکیدن، خشکیده و حتی درختان اخیرا قطع شده شمارش شد. همچنین از هر پلات نمونه خاک از عمق 30-0 سانتیمتری برداشت و مورد تجزیه قرار گرفت. بافت خاک، اسیدیته، هدایت الکتریکی، غلظت سدیم در عصاره اشباع، غلظت کلسیم، نسبت جذب سدیم، ظرفیت تبادل کاتیون، درصد نیتروژن کل و فسفر و پتاسیم قابل جذب از پارامترهای مورد اندازهگیری بودند. با در نظرگرفتن نرخ خشکیدگی ظاهری، نتایج طرح بلوکهای کاملا تصادفی نشان داد که خشیدگی درختان در خاکهای با مقادیر شوری و هدایت الکتریکی بیشتر افزایش مییابد. نتایج همچنین گویای اثرگذاری ساختمان خاک بر تنش خشکی بود. خاکهای تشکیل شده از تمام اندازه ذرات (بافت خاک) مقاومت بیشتری نسبت به خشکی نشان دادند. نتایج همچنین نشان داد که استفاده بیش از حد ازکودهای شیمیایی باعث کاهش مقاومت درختان سرونقرهای به تنش خشکی میشود. | ||
| کلیدواژهها | ||
| جنگلکاری؛ سرو نقرهای؛ خشکی؛ خصوصیات خاک؛ اصفهان | ||
| عنوان مقاله [English] | ||
| Impact of some soil physic-chemical properties on drought resistance Plantation of Arizona cypress in East of Isfahan | ||
| نویسندگان [English] | ||
| SH. Gorjestanizade؛ A. Soltani؛ H. Shariati | ||
| چکیده [English] | ||
| In recent years, Arizona cypress plantations located in East Isfahan are increasingly drying. Water deficit and frequent drought are allegedly considered as the main reasons. Nevertheless, the wilting trees are not evenly dispersed across the plantations, leading to existing associate factors. The present research Consider that the effect of soil chemo-physical characteristics on the wilting rate. Preliminary research work showed that the forest area studied can be classified on the basis of environmental stresses related to four separate regions. One area due to its proximity to population centers , the two , proximity to roads , the three, with a maximum distance from the areas with high stress potential and the due to the proximity to the industrial zone four were selected. In each plot, all trees, including health, are drying up, dried, and even recently cut trees were counted, as well as Soil samples were taken from each plot up to a depth of 30 cm and then analyzed in the laboratory. Soil texture, pH, electrical conductivity, sodium concentrations in treated, Concentrations of calcium, sodium adsorption ratio, cation exchange capacity, total nitrogen and phosphorus and Potassium absorbable parameters were measured. Wilting rate was increased significantly in more salty and more conductive soils. Soils made up of particles of all sizes were more resistant to drought. The results also showed that overuse chemical fertilizers decreased the trees’ survival in severe drought conditions. | ||
| کلیدواژهها [English] | ||
| Forest plantation, Arizona cypress, Drought, Physical and chemical properties of soil | ||
| مراجع | ||
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