Page 147 - Enzymes in Tropical Soils

Enzymes in Tropical Soils 135

Juma and Tabatabai (1977) reported that addition of 25 mmol Cu, Fe, Pb, Cd,
-1
Ni, and Zn kg soil decreased the activity of acid phosphatase as much as 18.7 –
47.7%. Mathur et al. (1980) also reported that the activity of phosphatase and soil
microorganisms of Histosol with higher Cu concentration was lower than those in
Histosol with lower concentration of Cu. Salam et al. (1997n) reported that Pb
depressed the activity of acid phosphatase as high as 46.5% at Pb addition of 40 mg
-1 -1
kg . They also reported that Cd addition of 40 mg kg decreased the acid
phosphatase activity as high as 43,5%. In other report, Salam (1997f) also showed
-1
that Pb addition of 40 mg kg significantly reduced the activity of alkaline
phosphatase in soil adjacent to Route 155 close to Nagoya and soil from Maiki-
Nisshi between Toyohashi and Okazaki, Aichi Prefecture, Japan, to 59-72% and -
glucosidase to 60-89%. The activity of Urease was also depressed by Pb. However,
-1
the Pb addition of 20-40 mg kg was observed to stimulate the activity of acid
phosphatase. Later, Salam et al. (1999h) also showed that the activity of acid
phosphatase in Pb contaminated soil planted with corn, amaranth, and green
kyllinga was depressed by Pb of electonics industrial waste, but the negative effect
of Pb was aleuviated by liming. The effect of Pb and Cd on the activities of acid
phosphatase activities are depicted in Fig. 9.3 and Fig. 9.4.

1.1
1
0.9
Relative Activity 0.7 Pb
0.8

0.6
0.5
0.4 Cd
0.3
0.2
0 10 20 30 40 50
-1
Heavy Metal Addition (mg kg )

Fig. 9.3. The effect of Pb and Cd on the activitity of soil acid phosphatase
(Adapted from Salam et al., 1997n).

Abdul Kadir Salam - 2014