M. Baghour et al., Influence of root temperature on phytoaccumulation of As, Ag, Cr, and Sb in potato plants (Solanum tuberosum L. Var. Spunta), J ENVIR S A, 36(7), 2001, pp. 1389-1401
Citations number
26
Categorie Soggetti
Environment/Ecology
Journal title
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
Three consecutive years of field experiments were carried out to investigat
e the effect of root temperatures induced by the application of mulches for
phytoextraction of As, Ag, Cr and Sb using potato plants (roots, tubers, s
tems and leaflets). Four different plastic covers were used (T1: transparen
t polyethylene; T2: white polyethylene; T3: white and black coextruded poly
ethylene; and T4: black polyethylene), taking uncovered plants as control (
TO). The different treatments had a significant effect on mean root tempera
tures (T0 = 16 degreesC, T1 = 20 degreesC, T2 = 23 degreesC, T3 = 27 degree
sC and T4 = 30 degreesC) and induced a significantly different response in
the As, Ag, Cr and Sb phytoaccumulation. The T3 treatment gave rise to the
greatest phytoaccumulation of As, Ag, Cr and Sb in the roots, leaflets and
tubers. In terms of the relative distribution of the phytoaccumulated metal
s (with respect to the total of the plant), As accumulated mainly in the ro
ots and leaflets whereas Ag, Cr and Sb accumulated primarily in the tubers,
establishing a close relationship between biomass development of each orga
n and phytoaccumulation capacity of elements in response to temperature in
the root zone. With regard to phytoremediation using the potato plant, it i
s necessary to ascertain the influence and include the control of the therm
al regime of the soil to optimize the phytoextraction of pollutants.