Salam, Abdul Kadir and Arata, Katayama and Kimura, Makoto (1998) Activities of some soil enzymes in different land use systems after deforestation in hilly areas of West Lampung, South Sumatra, Indonesia. Soil Science and Plant Nutrition, 44 (1). pp. 93-103. ISSN 0038-0768

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The activities of acid and alkaline phosphatases, β-glucosidase and urease were determined in soils under different land-use systems after deforestation in hilly areas of West Lampung, South Sumatra, Indonesia. Soil samples (topsoils, 0–20 cm and subsoils, 20–40 cm) were collected from 5 different locations, each consisting of 4 different land-use systems: i.e. primary forests, secondary forests, coffee plantations, and cultivated lands (upland fields and paddy fields). Enzyme analyses showed that the activities of phosphatases, β-glucosidase, and urease were significantly higher in most cases in the primary forests or in the secondary forests than in the other two land-use systems, indicating that clearing the forests and converting them to other land-use systems significantly disturbed the growth of enzyme-producing organisms. There was no significant difference in the enzymatic activities between cultivated upland fields and paddy fields. The activity of alkaline phosphatase showed the most drastic decrease after the conversion to the other land uses. Laboratory experiment showed that the optimum pH for phosphatases shifted to higher values due to the land-use conversion from the primary forests to the other land use systems. Analysis of subsoils showed significantly lower enzymatic activities compared to those in the topsoils. The activities of all soil enzymes in the topsoil were closely related to the soil organic-C and total-N contents, indicating that these properties are important for maintaining the soil enzymatic activities. Based on the land use change from 1978 in the study area (27 km x 27 km), the land conversion was estimated to have decreased the activities of the soil enzymes tested by 4–12% by 1984 and by 7–20% by 1990 in the uppermost 0–20 cm layers, and by 6–12% by 1984 and by 6–18% by 1990 in the next 20–40 cm layers from the levels in 1978, respectively.

Item Type: Article
Subjects: S Agriculture > S Agriculture (General)
Divisions: Fakultas Pertanian (FP) > Prodi Ilmu Tanah
Depositing User: Abdul Kadir Salam
Date Deposited: 03 Nov 2016 04:37
Last Modified: 03 Nov 2016 04:37

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