This research aimed to study the ability of both reeds (Phragmites
communis) and poplar trees (Populus nigra V.hamui) to accumulate
Pb and Cu. Where speared naturally prevail on the sides of the
Rumaila River in Jableh town (research site), during 2014-2015.
this research aimed to study the ability of both reeds (Phragmites communis) and
poplar trees (Populus nigra) to accumulate Cd and Zn. Where speared naturally prevail on
the sides of the Rumaila River in Jableh town (research site), during 2014-201
5. Average
amount of Cd on studied site was 3.081 ppm dry weight. Compared with the normal range
of soil content from Cd (0.06-1.1 ppm), we found that it is three times the normal upper
limit, indicating site contamination with Cd. The study showed that the Cd concentration in
the reed shoots was 0.031 ppm, while it was up to 0.055 ppm in leaves than that of shoots.
The value of bio-accumulation factor (BF) was 0.014. Also for poplar, the study revealed
predominance of leaves over bark with Cd concentration of 0.034 ppm versus 0.016 ppm
for poplar bark. BF value was 0.02. Regarding average amount of Zn in the soil of studied
site was recorded 116.61 ppm of dry weight. Compared with average range of Zn in
different types of soil (40-100 ppm), we find that it is slightly higher than the normal upper
limit, showing site contamination with Zn. The study stated that the Zn concentration in
reed leaves was 9.05 ppm versus 8.03 in the shoots. BF value was 0.07. Zn concentration
in poplar leaves was the lowest at 5.13 ppm versus 6.07 ppm for the bark. We notice from
these findings that the Zn amount in the parts of poplar plant is approximate. BF value was
0.05. The statistical analysis showed significant superiority of reed to poplar in terms of Cd
accumulation, and the same for Zn.
دراسة ومقارنة سلوكية النمو الأولي ونسبة التجذير بين صنفين من الحور المحلي ( الحور الابيض الرومي والحور الأسود الحموي) وصنف الحور الإيطالي الهجين
Effect of different doses of Gamma radiation (٢٠٠, ٤٠٠, and ٨٠٠ Rad) on
rooting of different clones of poplar was investigated. Results showed that the
dose of ٢٠٠ rad had a great effect on rooting. Percentage and the root length.
On the other han
d, the dose of ٨٠٠ rad had a negative effect on rooting. The
negative effect could be to the breakdown of the auxins in the cuttings. It had
been noticed that there was similarity among means of root weights with
regard to clones of Populus alba cv. buchovina. As for as the doses were
concened, these were no signix ficant diffecsnses among maens of that ments.
