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Master Thesis 2021:07 Department of Forest Ecology and Management Master Thesis 2021:07 Department of Forest Ecology and Management Drivers of topsoil saturated hydraulic conductivity in three contrasting landscapes in Kenya Restoring soil hydraulic conductivity in degraded tropical landscapes Huvudfaktorer bakom infiltrationskapacitet i tre kontrasterande landskap i Kenya David Falk Master thesis • 30 credits Swedish University of Agricultural Sciences, SLU Faculty of Forest Sciences MSc Forest Science ISSN 1654-1898 Umeå 2021 Drivers of topsoil saturated hydraulic conductivity in three contrasting landscapes in Kenya Huvudfaktorer bakom infiltrationskapacitet i tre kontrasterande landskap i Kenya David Falk Supervisor: Aida Bargués Tobella, SLU, Department of Forest Ecology and Management Deputy supervisor: Ulrik Ilstedt, SLU, Department of Forest Ecology and Management Deputy supervisor: Leigh Winowiecki, ICRAF Deputy supervisor: Tor-Gunnar Vågen, ICRAF Deputy supervisor: Madelon Lohbeck, Wageningen University, Forest Ecology and Forest Management Examinator: Gert Nyberg, SLU, Department of Forest Ecology and Management Credits: 30 Level: A2E Course title: Master’s thesis in forest science at the Department of Forest Ecology and Management Course code: EX0958 Program: MSc Euroforester Department: Department of Forest Ecology and Management Place of publication: Umeå Year of publication: 2021 Cover image: Aida Bargués Tobella Title of series: Master thesis Part number: 2021:07 ISSN: 1654-1898 Keywords: Infiltrability, mixed effects model, Kenya, land degradation, restoration, trees Swedish University of Agricultural Sciences Faculty of Forest Sciences Department of Forest Ecology and Management Sammanfattning Markförsämring i tropiska regioner kan ha förödande konsekvenser för vattentillgänglighet. Vattenkvalité och kvantitet är oerhört viktiga för lokalbefolkningar och är grundförutsättningar för socioekonomisk utveckling då stora delar av befolkningen i många tropiska länder är direkt beroende av jordbruk och boskapshållning för sin inkomst. En strategi för att öka mängden tillgängligt vatten i torra tropiska ekosystem är att öka hastigheten och kvantiteten av vattennederbörd som infiltreras i jorden. Olika faktorer samspelar i infiltrationskapaciteten, däribland vegetation, jordart och markanvändning. Förståelsen för hur olika variabler påverkar markens hydrologiska funktioner på landskapsnivå är begränsad. Det behövs mer forskning kring hur biologisk mångfald och vegetationsmängd påverkar infiltration. En vetenskaplig förståelse för hur dessa variabler påverkar infiltrationskapacitet är avgörande för effektiviteten av restaureringsinitiativ i tropiska områden som har försämrade vattentillgångar. Syftet med detta examensarbete är att undersöka huvudfaktorerna som påverkar infiltrationskapacitet i tre kontrasterande lokaler i Kenya, för att förstå vad som driver infiltration på en övergripande landskapsnivå. Linjära mixade modeller användes för att urskilja de viktigaste variablerna både i, och mellan de tre lokalerna. Variabler relaterade till markegenskaper, vegetationsmängd, funktionell biodiversitet, markanvändning och markförsämring inkluderades i modellerna. Resultaten visade att de statistiskt viktigaste variablerna var jordart, markanvändning, erosion och funktionell biodiversitet, för den modell som beskrev alla tre lokaler. Tre ytterligare modeller konstruerades och kunde påvisa att resultaten på enskild lokalnivå var annorlunda, då infiltrationskapaciteten i grovkornig jord var mest påverkad av jordart. I finkornig jord var andra variabler viktigare, så som markanvändning och markförsämring. Infiltrationskapaciteten är naturligt högre i grovkornig jord, därför har restaureringsinitiativ minimal effekt. Finkornig jord har lägre infiltrationskapacitet som i högre utsträckning skulle kunna påverkas av anpassad restaurering inriktad på att öka befintlig vegetation och minimera markanvändning som leder till markförsämring. Den här studien visar att olikheter i infiltrationskapacitet är relaterade till markegenskaper, vilket understryker behovet av restaureringsinitiativ som är anpassade till lokala förhållanden. Nyckelord: Infiltrationskapacitet, linjär mixad modell, Kenya, markförsämring, funktionell diversitet, vegetation Abstract Land degradation in the tropics has severe impacts on the availability of water and can lead to decreased rates of infiltration. Reduced infiltrability leads to less water availability, which negatively impacts livelihoods and hinders socioeconomic development. Understanding the drivers of infiltrability is essential for managing landscapes in the tropics, particularly when implementing restoration measures to improve soil hydrological function. The aim of this thesis is to identify the factors driving infiltrability across three different landscapes in Kenya. Linear mixed effects models were conducted to identify the main factors affecting infiltrability across and within sites, based on data from the Land Degradation Surveillance Framework. Variables related to inherent soil properties, land use, land degradation, functional diversity and vegetation cover were included in the model. Results indicate that the main factors increasing infiltrability across the three sites are land use, functional evenness and soil texture, while erosion decreases infiltrability. In coarse-grained soils, texture is the dominating factor while in fine- grained soils land use and degradation are more important. Hence, as infiltrability is inherently high in coarse-grained soils, improving soil hydrological function is not necessary. On the contrary, fine-grained soils have lower infiltrability that can be improved by adaptive restoration measures that target increasing continuous vegetation cover and minimizing land use practices that lead to land degradation. Therefore, this study demonstrates that differences in infiltrability are related to inherent soil properties, which emphasize the need for restoration measures adapted to an understanding of local site conditions. Keywords: Infiltrability, mixed effects model, Kenya, land degradation, functional diversity, vegetation Table of contents List of tables ..................................................................................................................... 7 List of figures .................................................................................................................... 8 Abbreviations.................................................................................................................... 9 1. Introduction ............................................................................................................ 11 2. Methodology .......................................................................................................... 16 2.1. Site Description ........................................................................................... 16 2.2. Soil and Land Health Survey ...................................................................... 17 2.3. Soil Laboratory Analyses ............................................................................ 20 2.4. Soil Infiltrability ............................................................................................ 20 2.5. Calculations ................................................................................................ 21 2.5.1. Functional Traits of Woody Species ................................................... 21 2.5.2. Aboveground Woody Biomass ........................................................... 22 2.5.3. Functional Properties of Woody Vegetation ....................................... 23 2.6. Statistical Analysis ...................................................................................... 24 3. Results .................................................................................................................... 28 3.1. Site Characterisation .................................................................................. 28 3.1.1. Soil Properties .................................................................................... 28 3.1.2. Land Use and Land Degradation ....................................................... 29 3.1.3. Vegetation Cover ............................................................................... 30 3.1.4. Functional Properties of Woody Vegetation ....................................... 31 3.2. Models ........................................................................................................ 32 3.2.1. Optimal Model Across Sites ............................................................... 32 3.2.2. Site-specific Models ........................................................................... 36 4. Discussion .............................................................................................................. 39 4.1. Inherent Soil Properties .............................................................................. 39 4.2. Land Degradation ....................................................................................... 40 4.3. Woody Functional Diversity ........................................................................ 42 4.4. Land Use .................................................................................................... 44 5. Conclusion ............................................................................................................. 46 6. References ............................................................................................................. 47
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