Session 2.2 carbon stock and tree diversity   sri lanka
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Session 2.2 carbon stock and tree diversity sri lanka

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Session 2.2 carbon stock and tree diversity sri lanka Presentation Transcript

  • 1. Carbon stock and tree diversity of dry zone homegardens in southern Sri Lanka Eskil Mattssona Madelene Ostwalda S.P. Nissankab a Division of Physical Resource Theory, Department of Energy and Environment, Chalmers University of Technology, Gothenburg, Sweden b Department of Crop Science, Faculty of Agriculture, University of Peradeniya, Sri Lanka World Congress of Agroforestry 2.2. Tropical homegardens: multifunctionality and benefits Feb 10, 2014 Delhi, India
  • 2. Homegardens in Sri Lanka • Traditionally important land use system – 13 percent of total land area • Provide multiple benefits offering fuelwood, timber, food and income (Kumar and Nair 2006; Pushpakumara et al. 2012) • Ongoing developing programs providing free seeds, fertilizer and technical advice (Mattsson and Johansson, 2011) Colombo
  • 3. (Mattsson et al. 2013) Homegardens in Sri Lanka – above ground biomass (AGB) carbon stocks
  • 4. Aims of study map and assess biophysical characteristics of Sri Lankan dry zone homegardens and implications for climate change mitigation and adaptation • investigate the amount and pattern of AGB carbon, soil organic carbon (SOC) and tree diversity • assess present soil fertility in homegarden and rainfed agriculture (chena) lands
  • 5. Study area Beralihela – Moneragala District - dry zone - wet zone - int. zone
  • 6. Methodology • Measurements of DBH, height and species frequency in small (≤ 0.2 ha), medium (0.4–0.8 ha) and large (>1 ha) homegardens (totally n = 45) • Soil samples in homegardens (n=45) and chena lands (n=20). Reference samples in natural forests • AGB carbon stock and soil organic matter estimation using allometric equations (Chave et al. 2005) and Walkley and Black method (Schumacher 2002)
  • 7. Results – AGB carbon stocks 0 5 10 15 20 25 30 35 AGBCarbonstock(MgCha-1) small homegardens (n=11) medium homegardens (n=27) large homegardens (n=7) mean (small+medium+large) 26 9 8 13 Mean in AGB Kandyan forest gardens: 87 Mg C ha-1 Mean in Dry monsoon forests: 106 Mg C ha-1 Mean in Open dry forests: 22 Mg C ha-1 (Mattsson et al. 2012)
  • 8. Results – soil organic carbon Soil organic carbon (%) Max Min Mean  SE Range Mg C ha-1 Homegardens 0–10 cm 1.7 0.2 1.1  0.04 1.5 15.9 Homegardens 20–30 cm 1.2 0.3 0.8  0.03 0.9 12.1 Chena 0–10 cm 1.4 0.6 0.9  0.05 0.8 14.2 Chena 20–30 cm 1.1 0.4 0.7  0.04 0.7 10.4 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1986 2013 SoilOrganicCarbon(%) Change of soil organic carbon 1986 – 2013 Dry open forest Homegardens Chena
  • 9. Results – tree diversity Homegarden size Species Shannon Wiener index (SWI) Mean number of species ha-1  SETotal Mean Mean  SE Range Small (0.2 ha) n=11 43 14.91 2.08  0.15 0.76 – 2.66 80  10.03 Medium (0.2–0.8 ha) n=27 58 15.52 2.07  0.09 1.08 – 3.01 23  2.13 Large (1.0–1.2 ha) n=7 37 15.57 1.94  0.16 1.52 – 2.60 15  1.78 All categories 73 15.38 2.05  0.07 0.76 – 3.01 36  4.65
  • 10. Implications and needs • large variety of AGB carbon stocks in measured dry-zone homegardens (1–56 tC/ha); less than wet zone homegardens (48 to 145 Mg C ha-1) • Higher carbon stocks and tree diversity per unit area in small homegardens (≤ 0.2 ha) than medium (0-4–0.8 ha) and large (>1 ha) • water accessibility improved – could improve crop diversification, carbon density and food security • soil fertility can be enhanced through awareness creation of agricultural technologies with local participation • harmonization with climate mitigation schemes under existing or emerging developing programs. Potential trade-offs needs further attention and food security is greater priority for farmers.
  • 11. www.focali.se www.siani.se