110<strong>World</strong> Agr<strong>of</strong>orestry <strong>in</strong>to the Futurecourse <strong>of</strong> pr<strong>of</strong>itability and the substantialvariation <strong>in</strong> soil properties, <strong>of</strong>ten at shortspatial range, with substantial differencesbetween soils <strong>in</strong> susceptibility tocompaction.Negotiations betweenstakeholders <strong>of</strong> solutions onthe basis <strong>of</strong> trade-<strong>of</strong>fs<strong>The</strong> basics <strong>of</strong> watershed functions arewell understood <strong>in</strong> most local ecologicalknowledge systems that have so far beenexplored (Joshi et al. 2004), as well as <strong>in</strong>formal ecohydrological science. <strong>The</strong>ir representation<strong>in</strong> general public debate andpolicy circles, however, leaves much scopefor improvement.Indonesia is rich <strong>in</strong> examples <strong>of</strong> landscapeswhere farmers have comb<strong>in</strong>ed the use <strong>of</strong>trees and other elements <strong>of</strong> the natural forestthat provide environmental serviceswith areas that are used for <strong>in</strong>tensive foodcrop production. <strong>The</strong>se agr<strong>of</strong>orestry mosaiclandscapes can be seen as ‘kebun l<strong>in</strong>dung’(protective gardens) that <strong>of</strong>fer great opportunityfor comb<strong>in</strong><strong>in</strong>g development andenvironment targets (Pasya et al. 2004; vanNoordwijk et al. 2004a). Yet, there are obstaclesto the recognition <strong>of</strong> these systems,as they may not meet the legal def<strong>in</strong>itions <strong>of</strong>forest or be <strong>in</strong> harmony with exist<strong>in</strong>g landuseregulation systems and policies – eventhough they could pass the test when functionalcriteria and <strong>in</strong>dicators would be used.In negotiat<strong>in</strong>g solutions to local problems,the follow<strong>in</strong>g aspects may require specificattention:1. Creation <strong>of</strong> local <strong>in</strong>filtration sites is <strong>of</strong>tenthe first step required to break out froma soil degradation–surface run<strong>of</strong>f erosioncycle. Such sites will both reduce negativeimpacts on downhill neighbour<strong>in</strong>gzones and allow for a positive feedbackloop <strong>of</strong> vegetation that stimulates formation<strong>of</strong> soil structure, <strong>in</strong>creas<strong>in</strong>g <strong>in</strong>filtrationand act<strong>in</strong>g as a further stimulus toplant growth. Triggers <strong>of</strong> such a positivefeedback can be remarkably simple:stone l<strong>in</strong>es (as used <strong>in</strong> the Sahel), plant<strong>in</strong>gholes made for trees (that may be thebest part, <strong>in</strong>itially, <strong>of</strong> reforestation effortsand is <strong>of</strong>ten not considered as such) orsmall strips left to natural vegetationsuccession <strong>in</strong> between ploughed fields(‘natural vegetative strips’, see Chapter 7this volume) as used <strong>in</strong> the Philipp<strong>in</strong>esand Indonesia.2. Tak<strong>in</strong>g natural forest soil as a basel<strong>in</strong>e,soil compaction will <strong>in</strong>itially have astronger effect on the lateral flows thataffect watershed functions than on theon-site productivity <strong>of</strong> the soil. <strong>Where</strong>protection <strong>of</strong> forest soils is feasible byreduction <strong>of</strong> the drivers <strong>of</strong> degradation,it is likely to be much more effectivethan efforts to rehabilitate degraded locations.Unfortunately, environmentalgovernance and reward systems tendto be reactive, and have difficulties <strong>in</strong>deal<strong>in</strong>g with avoidance <strong>of</strong> degradation,while rehabilitation is considered worthy<strong>of</strong> public <strong>in</strong>vestment.3. Enhanc<strong>in</strong>g soil organic matter levels haslittle direct <strong>in</strong>fluence on plant-availablewater, but a strong <strong>in</strong>direct effect via soilstructure, depend<strong>in</strong>g on the texture <strong>of</strong>the soil and the ra<strong>in</strong>fall regime. Susiloet al. (2004) discuss the relationshipbetween total organic <strong>in</strong>put <strong>in</strong> the agroecosystemand the various levels <strong>of</strong> thebelow-ground food-web.4. <strong>The</strong> most important part <strong>of</strong> a forest froma perspective <strong>of</strong> soil and water flows islikely to be <strong>in</strong> the litter and root turnovereffects, and that <strong>in</strong> turn supports soil biotato ma<strong>in</strong>ta<strong>in</strong> soil structure. Half-open(agr<strong>of</strong>orestry) land-use systems with treescan approach the same functionalitywhile provid<strong>in</strong>g better livelihood opportunitiesand <strong>in</strong>come (see van Noordwijket al. 2004b, for discussion <strong>of</strong> trade-<strong>of</strong>fbetween relative ecological and relativeagronomic functions, or REF and RAF).5. For assessment and monitor<strong>in</strong>g purposes,new methods and models thatprovide <strong>in</strong>ternal controls <strong>in</strong> the form <strong>of</strong>reference values for soil carbon and BDcan be used to deal with the <strong>in</strong>herentvariation <strong>in</strong> soil properties and the relationshipsbetween lateral flow processacross spatial scales.<strong>The</strong> discussion so far has highlighted theecological/technical side <strong>of</strong> soil structureand function. If agr<strong>of</strong>orestry is to achieve itsaims, understand<strong>in</strong>g <strong>of</strong> and actions target<strong>in</strong>gthese technical aspects at farm-managementscale will have to be embedded <strong>in</strong> a structure<strong>of</strong> rules and <strong>in</strong>centives that relate boththe downstream users <strong>of</strong> landscapes and thestakeholders <strong>in</strong> ma<strong>in</strong>tenance <strong>of</strong> watershedfunction to the decisions made on-farm. <strong>The</strong>past focus <strong>of</strong> watershed managers on forestcover per se may now give way to a moresubtle view <strong>in</strong> which land uses such as the‘kebun l<strong>in</strong>dung’ <strong>in</strong> Indonesia get the recognitionthat they are due (Pasya et al. 2004;van Noordwijk et al. 2004a).AcknowledgementsOur research on these topics <strong>in</strong> Indonesia <strong>in</strong>the context <strong>of</strong> the Alternatives to Slash andBurn consortium is supported by the AustralianCentre for International AgriculturalResearch (ACIAR) and the UK’s Departmentfor International Development (DFID), butthe views expressed rema<strong>in</strong> the authors’responsibility.
Chapter 12: Watershed functions <strong>in</strong> productive agricultural landscapes111ReferencesCadisch, G., P. de Willigen, D. Suprayogo, D.C.Mobbs, M. van Noordwijk and E.C. Rowe2004. Catch<strong>in</strong>g and compet<strong>in</strong>g for mobilenutrients <strong>in</strong> soils. Pp. 171–191, <strong>in</strong>: vanNoordwijk, M., G. Cadisch and C.K. Ong(eds) Below-ground Interactions <strong>in</strong> TropicalAgroecosystems. CAB International,Wall<strong>in</strong>gford, UK.Joshi, L., W. Schalenbourg, L. Johansson, N.Khasanah, E. Stefanus, M.H. Fagerströmand M. van Noordwijk 2004. Soil and watermovement: comb<strong>in</strong><strong>in</strong>g local ecologicalknowledge with that <strong>of</strong> modellers whenscal<strong>in</strong>g up from plot to landscape level.Pp. 349–364, <strong>in</strong>: van Noordwijk, M., G.Cadisch and C.K. Ong (eds) BelowgroundInteractions <strong>in</strong> Tropical Agroecosystems.CAB International, Wall<strong>in</strong>gford, UK.Farida and M. van Noordwijk 2004. Analisisdebit sungai akibat alih guna lahan danaplikasi model GenRiver pada DAS WayBesai, Sumberjaya. [Analysis <strong>of</strong> changes <strong>in</strong>river flow <strong>in</strong> response to land use change,and application <strong>of</strong> the GenRiver model tothe Way Besai watershed <strong>in</strong> Sumberjaya].Agrivita 26: 39–47.Hairiah, K., D. Suprayogo, Widianto, Berlian, E.Suhara, A. Mardiastun<strong>in</strong>g, C. Prayogo andS. Rahayu 2004. Alih Guna Lahan HutanMenjadi Lahan Agr<strong>of</strong>orestri Berbasis Kopi:ketebalan seresah, populasi cac<strong>in</strong>g tanahdan makroporositas tanah. [Thickness <strong>of</strong>the litter layer, earthworm populationsand soil macroporosity as <strong>in</strong>fluenced byland use <strong>in</strong> c<strong>of</strong>fee-based agr<strong>of</strong>orestry].Agrivita 26: 68–80.Khasanah, N., B. Lusiana, Farida and M. vanNoordwijk 2004. Simulasi LimpasanPermukaan dan Kehilangan Tanah padaBerbagai Umur Kebun Kopi: Studi Kasusdi Sumberjaya, Lampung Barat. [Simulation<strong>of</strong> surface run<strong>of</strong>f and soil loss <strong>in</strong>relation to age <strong>of</strong> c<strong>of</strong>fee gardens: casestudy <strong>in</strong> Sumberjaya, West Lampung].Agrivita 26: 81–89.Matthews, R., M. van Noordwijk, A.J. Gijsmanand G. Cadisch 2004. Models <strong>of</strong> belowground<strong>in</strong>teractions: their validity, applicabilityand beneficiaries. Pp. 41–60, <strong>in</strong>: vanNoordwijk, M., G. Cadisch and C.K. Ong(eds) Belowground Interactions <strong>in</strong> TropicalAgroecosystems, CAB International,Wall<strong>in</strong>gford, UK.Pasya, G., C. Fay and M. van Noordwijk 2004.Sistem pendukung negosiasi multi tatarandalam pengelolaan sumberdaya alamsecara terpadu: dari konsep h<strong>in</strong>gga praktek.[Negotiation support systems forsusta<strong>in</strong>able natural resource management:from concept to application]. Agrivita 26:8–19.Ranieri, S.B.L., R. Stirzaker, D. Suprayogo, E.Purwanto, P. de Willigen and M. vanNoordwijk 2004. Manag<strong>in</strong>g movements<strong>of</strong> water, solutes and soil: from plot tolandscape scale. Pp. 329–347, <strong>in</strong>: vanNoordwijk, M., G. Cadisch and C.K. Ong(eds) Belowground Interactions <strong>in</strong> TropicalAgroecosystems, CAB International, Wall<strong>in</strong>gford,UK.Suprayogo, D., Widianto, G. Cadish and M. vanNoordwijk 2003. A Pedotransfer resourcedatabase (PTFRDB) for tropical soils: testwith the water balance <strong>of</strong> WaNuLCAS. In:D. Post (ed) MODSIM proceed<strong>in</strong>gs, July2003, Townsville, Australia.Susilo, F.X., A.M. Neutel M. van Noordwijk, K.Hairiah, G. Brown and M.J. Swift 2004.Soil biodiversity and food webs. Pp. 285–307, <strong>in</strong>: van Noordwijk, M., G. Cadischand C.K. Ong (eds) Belowground Interactions<strong>in</strong> Tropical Agroecosystems. CABInternational, Wall<strong>in</strong>gford, UK.Suyamto, D.A., M. van Noordwijk and B.Lusiana 2004. Respon petani kopi terhadapgejolak pasar dan konsekuens<strong>in</strong>yaterhadap fungsi tata air: suatu pendekatanpemodelan. [C<strong>of</strong>fee farmers’ responseto market shocks and consequencesfor watershed functions: a modell<strong>in</strong>gapproach]. Agrivita 26: 118–131.van Noordwijk, M., J. Richey and D. Thomas2003. Landscape and (sub)CatchmentScale Model<strong>in</strong>g <strong>of</strong> Effects <strong>of</strong> ForestConversion on Watershed Functionsand Biodiversity <strong>in</strong> Southeast Asia. Alternativesto Slash and Burn, BNPP Activity 2Technical Report. [http://www.worldagro-forestrycentre.org/sea/upload/me<strong>in</strong>e/FVO-BAct2_all_2.pdf]van Noordwijk, M., F. Agus, D. Suprayogo,K. Hairiah, G. Pasya, B. Verbist andFarida 2004a. Peranan agr<strong>of</strong>orestry dalammempertahankan fungsi hidrologi daerahaliran sungai (DAS). [Role <strong>of</strong> agr<strong>of</strong>orestry<strong>in</strong> ma<strong>in</strong>tenance <strong>of</strong> hydrological functions<strong>in</strong> water catchment areas]. Agrivita 26:1–8.van Noordwijk, M., G. Cadisch and C.K. Ong2004b. Challenges for the next decade <strong>of</strong>research on below-ground <strong>in</strong>teractions <strong>in</strong>tropical agroecosystems: client-driven solutionsat landscape scale. Pp. 365–379,<strong>in</strong>: van Noordwijk, M., G. Cadisch andC.K. Ong (eds) Belowground Interactions<strong>in</strong> Tropical Agroecosystems. CAB International,Wall<strong>in</strong>gford, UK.van Noordwijk, M., B. Lusiana and N. Khasanah2004c. WaNuLCAS 3.01, Backgroundon a model <strong>of</strong> water nutrient and lightcapture <strong>in</strong> agr<strong>of</strong>orestry systems. InternationalCentre for Research <strong>in</strong> Agr<strong>of</strong>orestry(ICRAF), Bogor, Indonesia.van Noordwijk, M., S. Rahayu, S.E. Williams,K. Hairiah, N. Khasanah and G. Schroth2004d. Crop and tree root-system dynamics.Pp. 83–107, <strong>in</strong>: van Noordwijk, M., G.Cadisch and C.K. Ong (eds) BelowgroundInteractions <strong>in</strong> Tropical Agroecosystems.CAB International, Wall<strong>in</strong>gford, UK.
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CitationGarrity, D., A. Okono, M. G
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Enhancing Environmental ServicesCha
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viiiWorld Agroforestry into the Fut
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Agroforestry and the Future
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Keywords:Millennium Development Goa
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Chapter 1: Science-based agroforest
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Chapter 1: Science-based agroforest
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Trees and Markets
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Chapter 3: The future of perennial
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Chapter 3: The future of perennial
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Chapter 6: Agroforestry innovations
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Chapter 20Strengthening Institution
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Author ContactsFahmudin Agusisri@in
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Acronyms and AbbreviationsACIARAFTP
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CreditsFront cover photo: Karen Rob
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