Page 169 - Enzymes in Tropical Soils
P. 169
Enzymes in Tropical Soils 157
develop; organic C for energy source and N for protein formation. The presence of
more soil microorganisms may speed up the decomposition of organic matters.
The production of organic acids by soil microorganisms and lower pH value will also
speed up the chemical weathering of soil minerals releasing their constituents.
Table 10.5. The available P in in sugarcane and pineapple
plantations of Central Lampung Indonesia*.
Period of
Available P
No Cultivation -1
(mg kg )
(Years)
A. Sugarcane Plantation:
1 0** 8.44
2 3 7.19
3 9 8.16
4 13 23.1
5 20 63.6
B. Pineapple Plantation:
1 0*** 199.0
2 5 3.17
3 10 3.17
4 15 11.0
5 20 21.5
*Adapted from Salam et al. (1999e); **Bushes
adjacent to plantations; *** newly opened
10.3 Effects of Forest Clearing and Land-Use Conversion
on Soil Enzymatic Properties
Similar to the soil chemical, physical, and biological properties, land-use
conversion also significantly affected the soil enzymatic activities. Observation in
five sites in West Lampung Indonesia showed with a few exception that forest
clearing and conversion to secondary forest, coffee plantation, and cultivated lands
significantly decreased the soil enzymatic activities including the acid and alkaline
Abdul Kadir Salam - 2014
