کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9477594 | 1324338 | 2005 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The effects of NH4+ and NO3â on growth, resource allocation and nitrogen uptake kinetics of Phragmites australis and Glyceria maxima
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم آبزیان
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Species differed in the nitrogen utilisation. In Glyceria, the relative tissue N content was higher than in Phragmites and was increased in NH4+ treated plants by 16%. The tissue NH4+ concentration (mean = 1.6 μmol g fresh wtâ1) was not affected by N treatment, whereas NO3â contents were higher in NO3â (mean = 1.5 μmol g fresh wtâ1) than in NH4+ (mean = 0.4 μmol g fresh wtâ1) treated plants. In Phragmites, NH4+ (mean = 1.6 μmol g fresh wtâ1) and NO3â (mean = 0.2 μmol g fresh wtâ1) contents were not affected by the N regime. Species did not differ in NH4+ (mean = 56.5 μmol gâ1 root dry wt hâ1) and NO3â (mean = 34.5 μmol gâ1 root dry wt hâ1) maximum uptake rates (Vmax), and Vmax for NH4+ uptake was not affected by N treatment. The uptake rate of NO3â was low in NH4+ treated plants, and an induction phase for NO3â was observed in NH4+ treated Phragmites but not in Glyceria. Phragmites had low Km (mean = 4.5 μM) and high affinity (10.3 l gâ1 root dry wt hâ1) for both ions compared to Glyceria (Km = 6.3 μM, affinity = 8.0 l gâ1 root dry wt hâ1). The results showed different plasticity of Phragmites and Glyceria toward N source. The positive response to NH4+-N source may participates in the observed success of Glyceria at NH4+ rich sites, although other factors have to be considered. Higher plasticity of Phragmites toward low nutrient availability may favour this species at oligotrophic sites.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Aquatic Botany - Volume 81, Issue 4, April 2005, Pages 326-342
Journal: Aquatic Botany - Volume 81, Issue 4, April 2005, Pages 326-342
نویسندگان
Edita Tylova-Munzarova, Bent Lorenzen, Hans Brix, Olga Votrubova,