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The Chemistry and Fertility of Soils under Tropical Weeds 107

Table 6.10. The correlation coefficients between soil organic C and
enzymatic activities of soils in hilly areas of West Lampung*

Soil Enzymes Topsoils Subsoils

Acid Phosphatase 0.716* 0.823*
Alkaline Phosphatase 0.584 0.716*

-Glucosidase 0.672* 0.404
Urease 0.734* 0.529

*Adapted from Salam et al. (1998b)

Table 6.11. The correlation coefficients between soil organic C and
enzymatic activities in the middle terrace areas of Lampung*.

Soil Enzymes Cassava Sugarcane Pineapple

Acid Phosphatase 0.898** 0.479* 0.542**

Alkaline Phosphatase 0.605* 0.527** 0.482**

-Glucosidase 0.790** 0.379 0.419*

Arylsulfatase 0.887** 0.351 0.049

*Adapted from Salam et al. (1999b)

The above linear relationship has been repeatedly reported by some other
researchers (Nannipieri et al., 1980; Harrison, 1983; Trasar-Cepeda and Gil-Sotres,
1987; Bonmati et al., 1991; Tate III et al., 1991; Martens et al., 1992; Salam, 1996;
Salam et al., 1998b; Salam et al., 1999b; Margalef et al., 2017). Salam et al. (1998b)
report that the activities of soil enzymes, including acid and alkaline phosphatases,
urease, and arylsulfatase, decreased in the order of primary forest, secondary
forest, and cultivated land, in accordance with the decrease in soil total N. Salam
et al. (1999b) also show, from their study in soils with various lengths of cultivation
in Central Lampung, Indonesia, that the total content of N in soils was positively
Abdul Kadir Salam and Nanik Sriyani – 2019