کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4390114 1305158 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Differences in rhizome aeration of Phragmites australis in a constructed wetland
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
Differences in rhizome aeration of Phragmites australis in a constructed wetland
چکیده انگلیسی

Waterlogged soils are a challenging environment for plants due to anoxic conditions and enrichment of phytotoxic substances in the rhizosphere. High contents of organic matter in the substrate as present in constructed wetlands (CW) may amplify these effects. The influence of substrate organic matter on the rhizome aeration of Phragmites australis (common reed) was investigated in a CW for sewage treatment on two sites with different organic concentrations: (a) inflow part of the bed with a high organic charge (high-organic site) and (b) outflow zone of the bed with a lower organic charge (low-organic site). Several diurnal oxygen (O2) courses were recorded inside the rhizomes using micro-optodes. Maximum O2 percentages in the rhizomes were generally the same at both sites, but minimum O2 values were lower in the low-organic site than in the high-organic site, leading to higher amplitudes at the low-organic site. The results suggest that oxygen release from the roots is hampered under high-organic compared to low-organic conditions. This observation might be explained by changes in gas conductivity of the roots, but also by alterations in microbial oxygen demand, under different organic burden.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Engineering - Volume 37, Issue 11, November 2011, Pages 1647–1653
نویسندگان
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