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OP05:Impact of land use on selected soil organisms (part1) [compatibility mode]
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OP05:Impact of land use on selected soil organisms (part1) [compatibility mode]

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A presentation by the BGBD Kenya team

A presentation by the BGBD Kenya team

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OP05:Impact of land use on selected soil organisms (part1) [compatibility mode] Document Transcript

  • 1. 5/27/2010 Introduction IMPACT OF LAND USE ON SELECTED SOIL • Conservation and sustainable use of biodiversity is one of ORGANISMS IN TAITA AND EMBU BENCHMARK the pillars of development. SITES, KENYA • Ecosystem services such as decomposition, nutrient cycling and disease/pest regulation are products of Biodiversity • Sensitivity to loss of biodiversity is of great concern to the world population BGBD Kenya team • This has catalyzed the channeling of resources to research hi h l d h h li f h The BGBD National Office, on biodiversity. University of Nairobi, Kenya, • However, soil biodiversity has not received adequate Tel: 254-020-4442115, Email: attention despite its contribution to sustainable agricultural bgbd@uonbi.ac.ke productivity • This study was therefore undertaken to determine the effect of land use on soil biota in Embu and Taita benchmark sites. Benchmark sites Methodology • The benchmark sites selected • Grid method was used to establish the sampling points across land use intensification • Methods and criterion for soil sampling were as described gradients were: by Moreira et al. (2008). – Embu - stretching from Irangi forest into the adjacent farms. • Samples were analysed for selected functional groups which – Taita Hills stretching from included Ngangao forest into the farms • Characterization, Micoregulators, Mesofauna, macroafauna and plant pathogens – Biodiversity hotspots, supporting some endemic plant and animal species. Pitfalls Transect Nematode trapping Colembola Acari fungi Monolith Nematode Earthworm Mycorrhiza 1
  • 2. 5/27/2010 Trichoderma along land use types Results • There was a general change of soil biota with increased land intensification. • Soil pathogens (Pythium and Fusarium) and Plant parasitic nematodes increased with increased land use intensity. • Nematode trapping fungi increased with increase land intensification Land use types and Nutrients- Arbuscular Nematode destroying Fungi Mycorrhizal Fungi (AMF) Effect of land use on occurrence of nematode destroying fungi Parasitism index of plant parasitic nematodes in different land use types. 35 3.5 Frequency of occurrence % 30 3 2.5 25 Pa paras index 2 itc 20 1.5 nt n y la 15 1 0.5 10 0 5 P lant at ion Nat ural Napier Fallow Coffee Maize Veget able forest forest Land use t ype 0 Forest Shrub Napier Maize/ beans Vegetables Land use 2
  • 3. 5/27/2010 Abundance of mites across land use types in dry and wet seasons in Embu Abundance of Collembola across land use types in dry and wet seasons in Embu 1000 Abundance of Collem bola Mean abun dance of m ites 900 250 800 200 700 600 150 500 100 400 e 50 300 0 200 100 e a er st 0 w ak ze st ffe Te llo pi re re ai O Co Na Fa fo M fo u er l ra us e a er w us x ze M us ff e Te tu te t ll o pi yp no ai Na Vi t Co Na yp Fa l M ca ge l ca Eu di Eu In Land use types Land use types Bacteria in association with Legumes Conclusion • There was a general decline of soil biota with increased land intensification. • Soil pathogens (Pythium and Fusarium) and Plant parasitic nematodes increased Land use system No. of sampling Rhizobia populations points (n) (cells g-1 soil) with increased land use intensity. Coffee 8 1.1 × 102 ± 3.71 Tea 10 1.1 × 102 ± 3.32 • Nematode trapping fungi increased with Maize, beans intercrop 8 1.1 × 102 ± 3.71 increase land intensification Napier 6 6.1 × 10 ± 3.19 Fallow 7 2.3 × 102 ± 5.73 Indigenous forest 8 0 3
  • 4. 5/27/2010 Nematode trapping Colembola Acari fungi Nematode Earthworm Mycorrhiza ASANTE 4