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Widianto, K. Hairiah, W.S. Dewi, Hascaryo, D. Saputra, F.K. Aini, D. Suprayogo, N.Khasanah and M. van Noordwijk L Litter layer, population density of earthworm and soil macroporosity UNIV. BRAWIJAYA Suprayogo09@yahoo.com
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Land Cover in East Java (Malang) Land Cover in Sumatra (West Lampung)
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stem-flow through-fall rainfall cloud interception lateral outflow percolation recharge infiltrasi surface evaporation transpiration canopy water evaporation uptake Quick flow base flow { surface run-on sub- surface lateral inflow surface run-off Flow: tree Soil Hydrology function of ‘forest’: lanscape ?
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ForestAgriculture: Monoculture / Polyculture Decomposition & Mineralisation Water Quality Run - off Other macrofauna Earthworm SOM Macroporosity & Water Infiltration Thickness of Surface Litter Slope and rainfall Protection to soil surface
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Reduced Run-off IF: 1. Good and long soil cover ~ Litter thickness, slowly decomposed litter 2.High soil roughness ~ branches, understorey 3.Good water infiltration ~ enough soil macro pore
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Purpose 1. Litter Litter Input Decomposition 2. Worm Population density Biomass 3. Soil Macroporosity Infiltration
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West Lampung Malang SUMATRA JAVA
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2.Multistrata coffee 3. Shaded coffee 1.Forest 4.Monoculture Coffee Survey
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1.Litterfall 2.Prunning Do litter composition of LUS differs one to another?
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Annual Litter Input in Sumatra
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LUS Litterfall Mg ha -1 yr -1 NLP (L+P)/N --------------%----------- Forest11.11.2421.16.3722.2 Multistrata C.7.72.234.96.1218.6 Shaded C.6.02.1532.34.2517.0 Monoculture C.3.91.9537.75.1922.0 Annual Litter input and its quality of various LUS in Java (L+P)/N > 10 low quality slow decompose (Van Lauwe et al, 1997)
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D ECOMPOSITION RATE OF LITTER
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Cast production weekly observed Measurement of Earthworm
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Klitelum Dominant Spesies in Indonesian Agriculture : Pontoscolex corethrurus Prostomium Seta cocon Genetal pore & TP Anterior Taken by: Dewi Taken by: Fragoso Total: 11 species
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Earthworm population Number anecic + endogeic Forest: Amynthas gracillis & Peryonix excavatus (bigger size) Coffee based: Dichogaster bolaui (smaller size)
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(Lavelle, 1997) (Van Noordwijk, 1985) Role of Earthworm and Roots on Macropore
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Soil Macro porosity measurement (Methylen Blue), Feb. 2008
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Macropore in- vertical plane Coffee monoculture Imperata grassland Coffee-based Agroforestry Forest 100 cm 30 cm 20 % 8 % 6 % 12 %
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Measurement of water infiltration
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Macroporosity and Infiltration
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Earthworm (Pontoscolex) vs Soil porosity
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Macropore = 0.78 Roots – 15.6 B/P non-Pontoscolex + 5.02 Litter thickness (R 2 = 0.98**) Managing Crop Diversity is the key factor for maintaining Soil macropore Litter, earthworm, roots and Macropore Dewi et al., 2006)
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Worm size+po- pulation Worm Biomass SOM LITTER LAYER Litter Input (various shade trees in AF coffee based systems) Worm Activity Macro pore “SoilStructDyn” (as a part of WaNuLCAS model) Van Noordwijk et al, 2005
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LUS Surface litter, Mg ha -1 C org relative to C org forest, % Macropore, % Earthworm Biomass, g m -2 MSMSMSMS Forest 4.24.91.0 12.312.53125.8 Multistrata 3.32.30.440.473.64.81817.8 Shaded 31.10.550.423.52.6714.1 Monokultur e 1.61.50.430.4032.2129.5 Estimation of “SoilStruct Dyn” Modelling
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1.Better litter layer improved soil macroporosity and Water infiltration 2.Improvement of macroporosity in AF ~ 2.Improvement of macroporosity in AF ~ Size of Earthworms (anecic group) 3.A combination of trees with slowly decomposing litter protect the soil surface, and trees with deep root systems create macroporosity
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This activity was funded by ACIAR- ICRAF S.E. Asia, Ministry of Education (DIKTI- A2 Program) and CIFOR - Tropical Forest and Climate Change Adaptation (TroFCCA) project
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