توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Responses of selected plants to petroleum contamination during phytoremediation
اطلاعات انتشار: اولین همایش تخصصی مهندسی محیط زیست، سال
تعداد صفحات: ۱۳
Difference in the ability of various plant species to germinate and grow in contaminated soils should be better explored in order to choose the most appropriate plant species in the development of any phytoremediation process. In this study, germination and subsequent growth of seven plants including tall fescue (Festuca arundiacea), Agropyron smithi, Puccenillia distance, white clover (Trifolium repens), canola (Brassica napus), safflower (Carthamus tinctorius) and sunflower (Heliantus annus) were tested in soils with three petroleum contamination levels. Presence of Total Petroleum Hydrocarbons (TPHs) in the soil had no effect on seed germination of agropyron, white clover, sunflower and safflower, although canola and white clover seedlings were sensitive to these compounds and failed to produce dry yield matter at the end of trial period. In contrast, seed germination of canola, puccenillia and tall fescue were decreased in the contaminated soils. No reduction was found in dry weight of puccenillia in contaminated soils (C1 and C2) compared to control, however, the presence of TPHs proportional to the contamination level, decreased dry weight of sunflower and safflower. The results showed that plant genotypes studied here significantly varied in seed germination in petroleum contaminated soils although germination did not predict the plant genotypes differences in subsequent growth. It indicates that germination testing alone does not provide a short cut to assessing the suitability of plant species for subsequent testing in field trials.<\div>

۲Bioaccumulation of Nickel and Lead by Bermuda Grass (Cynodon dactylon) and Tall Fescue (Festuca arundinacea) from Two Contaminated Soils (انگلیسی)
نویسنده(ها): ، ، ، ، ، ، ، ، ،
اطلاعات انتشار: مجله علوم محيطي خزر، هفتم،شماره۲، ۲۰۰۹، سال
تعداد صفحات: ۱۲
Soil and sediments of the estuaries and wetlands in Northwest of Persian Gulf are recently polluted with different heavy metals because of municipal and industrial wastewaters. Therefore an urgent soil cleaning up and remediation program is vital in this region. Consequently, this study was initiated to screen two plant species (Festuca arundinacea and Cynodon dactylon) for hyperaccumulation of nickel (Ni) and lead (Pb) as one of the candidate methods for cleaning–up soil and sediments of Shadegan wetland. Soil samples (0–30 cm) were collected from two sites in the wetland. The soil samples were treated with solutions of Ni and Pb separately which resulted into content of 50 and 100 mg kg–1 of metals in each soil. Thereafter, the plants were sown in the soils under greenhouse conditions and harvested after 10 weeks. Ni and Pb contents were measured in root and shoot of plants. Results showed that accumulation of Ni and Pb in tall fescue roots were significantly (P0.05) greater than that in Bermuda grass. The amounts of Pb in root and shoot of plants were increased when soil Pb contents were increased from 50 to 100 mg kg–1 while Ni contents were only increased in the roots in response to increase in soil Ni content. The comparing of the shoot–root ratio showed that Pb accumulation in the roots of both plants was higher than that in the shoots, while for Ni was reverse. Due to difference in backgrounds of soil metal contents and soil characteristics, accumulation of Ni and Pb by plants were different in two soils
نمایش نتایج ۱ تا ۲ از میان ۲ نتیجه