Determinants of t Flemingia congesta and t Dactyladenia barteri mulch decomposition in alley-cropping systems in the humid tropics
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Effects of soil macrofauna, micro-environment and mulch quantity were investigated on an acid Ultisol in a high-rainfall area in S.E. Nigeria, using litterbags or littertubes with leaves from the trees of an alley cropping system with t Flemingia congesta or t Dactyladenia barteri as hedgerow species.There was no effect of mulch quantity on the rate of decomposition. Soil macrofauna contributed to between 30 and 40% of mulch decomposition over the period of approximately 50% of disappearance of the original material. The faunal effect became apparent after a longer incubation period (>20 weeks) with the slower decomposing t Dactyladenia than with the t Flemingia mulch (immediate effect). This is presumably related to t Dactyladenia's higher lignin content (40% compared to 22% for t Flemingia). The t Flemingia mulch decomposed faster in alley cropping with t Dactyladenia hedgerow than with t Flemingia hedgerow, irrespective of faunal access, suggesting a microclimate efffect on decomposition. There were no marked changes in chemical composition of the mulches with decomposition period, except for a rapid decrease of K content in both mulches and a rapid increase in lignin content of the t Flemingia mulch within the first 10 days of decomposition, which indicates that early decomposition affected the relatively easily degradable compounds.
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- Determinants of t Flemingia congesta and t Dactyladenia barteri mulch decomposition in alley-cropping systems in the humid tropics
Plant and Soil
Volume 191, Issue 1 , pp 101-107
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- humid tropics
- soil fauna
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- Author Affiliations
- 1. International Institute of Tropical Agriculture, High Rainfall Station, PO 2008, Nchia Eleme, Rivers State, Nigeria and
- 2. Research Institute for Agrobiology and Soil Fertility (AB-DLO), PO 129, Haren, Netherlands
- 3. Department of Terrestrial Ecology and Nature Conservation, Wageningen Agricultural University, Netherlands