Soil physical and micronutrient changes following clearing of a tropical rainforest

被引：8

作者：

Eneji, Anthony Egrinya ^{[1
]}

Agboola, Akinola ^{[2
]}

Aiyelari, Emilolorun Ambrose ^{[2
]}

Honna, Toshimasa ^{[1
]}

Yamamoto, Sadahiro ^{[1
]}

Irshad, Muhammad ^{[1
]}

Endo, Tsuneyoshi ^{[1
]}

机构：

[1] Faculty of Agriculture, Tottori University

[2] Department of Agronomy, University of Ibadan

来源：

Journal of Forest Research | 2003年 / 8卷 / 03期

关键词：

Bulk density; Clearing; Forest; Micronutrients; Soil texture; Tropics;

D O I：

10.1007/s10310-003-0030-6

中图分类号：

学科分类号：

摘要：

One of the options for achieving an adequate food supply in tropical Africa is by bringing more land into production. This often requires clearing and developing new vegetation areas for agricultural production. In sub-Saharan Africa, large areas of forest are being cleared for cultivation without adequate knowledge as to the consequences of the clearing method employed. This study was therefore initiated to, among other objectives, assess the effects of some forest clearing methods on soil compaction, texture, and micronutrients. Treatments were the following five clearing methods: (1) mechanical (MC), (2) semi-mechanical (SMC), (3) slash and burn (manual) (SB), (4) mechanical - no planting (MCNP), and (5) slash and burn -no planting (SBNP). After clearing, we planted maize and cowpea in every other row during the first year, and planted maize and cassava during the second year in the plots of treatments 1-3. Changes in soil texture, bulk density, and exchangeable Fe, Zn, Mn, and Cu were determined. Soil bulk density increased (with depth) in all treatments from the intitial (0-15cm) level of 1.1 g cm-3 to between 1.27 and 1.39 g cm-3 2 years after clearing, with the highest levels occurring in the MC plots. This indicated that clearing was accompanied by soil compaction. Some changes were noted in soil textural composition, but these were not of practical significance. Exchangeable Mn, Fe, and Cu (0-15 cm) decreased markedly after clearing, especially under MC in the first year. Zinc levels changed little during the study period. The decline in micronutrient levels was paralleled by a decline in soil organic carbon.

引用

页码：215 / 219

页数：4

共 27 条

[1]

The social dynamics of environmental change in Africa, Newsletter, 2, 9, pp. 1-16, (1992)

[2]

Agboola A.A., A recipe for continuous arable crop production in the forest zone of western Nigeria, Alternative to Slash-and-burn Agriculture. Symposium ID-6 15th International Soil Science Congress, pp. 107-120, (1994)

[3]

Aina P.O., Soil changes resulting from longterm management practices, Soil Sci Soc Am J, 43, pp. 173-177, (1979)

[4]

Barney G.O., The Global 2000 Report to the President of the USA, (1980)

[5]

Blake G.R., Hartge K.H., Bulk density, Methods of Aoil Analysis, Part 1. Physical and Mineralogical Methods, 2nd Edn., pp. 363-375, (1986)

[6]

Bray R.H., Kurtz L.T., Determination of total organic and available forms of phosphorus in soil, Soil Sci, 59, pp. 39-45, (1945)

[7]

Cox F.R., Kamprath E.J., Micronutrient soil test, Micronutrients in Agriculture, pp. 289-317, (1973)

[8]

Detwiler R.P., Land use change and the global carbon cycle: The role of tropical soils, Biogeochemistry, 2, pp. 67-93, (1986)

[9]

Eckholm E., Planting for the future: Forestry and human needs, Worldwatch Paper, 26, (1979)

[10]

Eneji A.E., Ayade B.B., Land clearing effect on the variability of some soil properties of an Alfisol in south-western Nigeria, Tropicultura, 18, 3, pp. 107-111, (2000)

← 1 2 3 →