Large shrubs increase soil nutrients in a semi-arid savanna

Abule, 2005, The influence of woody plants and livestock grazing on grass species composition, yield and soil nutrients in the Middle Awash Valley of Ethiopia, J. Arid Environ., 60, 343, 10.1016/j.jaridenv.2004.04.006 Allington, 2014, Islands of fertility: a byproduct of grazing?, Ecosystems, 17, 127, 10.1007/s10021-013-9711-y Allison, 1965, Organic carbon, 9, 545 Austin, 2002, Carbon and nitrogen dynamics across a natural precipitation gradient in Patagonia, Argentina, J. Veg. Sci., 13, 351, 10.1111/j.1654-1103.2002.tb02059.x Barnes, 2015, Sunlight and soil–litter mixing: drivers of litter decomposition in drylands, 274, 10.1007/978-3-319-08807-5_11 Bell, 2014, Rhizosphere stoichiometry: are C:N:P ratios of plants, soils, and enzymes conserved at the plant species-level?, New Phytol., 201, 505, 10.1111/nph.12531 Belovsky, 1978, Diet optimization in a generalist herbivore: the moose, Theor. Popul. Biol., 14, 105, 10.1016/0040-5809(78)90007-2 Belsky, 1994, Influences of trees on savanna productivity: tests of shade, nutrients, and tree-grass competition, Ecology, 75, 922, 10.2307/1939416 Britz, 2007, The effects of soil conditions and grazing strategy on plant species composition in a semi-arid savanna, Afr. J. Range For. Sci., 24, 51, 10.2989/AJRFS.2007.24.2.1.155 Chapin, 2002 Charley, 1975, Plant-induced soil chemical patterns in some shrub-dominated semi-desert ecosystems of Utah, J. Ecol., 63, 945, 10.2307/2258613 Cleveland, 2007, C:N:P stoichiometry in soil: is there a “Redfield ratio” for the microbial biomass?, Biogeochemistry, 85, 235, 10.1007/s10533-007-9132-0 Cramer, 2013, N-fertilization does not alleviate grass competition induced reduction of growth of African savanna species, Plant Soil, 366, 563, 10.1007/s11104-012-1456-4 Cramer, 2010, Growth of N2-fixing African savanna Acacia species is constrained by below-ground competition with grass, J. Ecol., 98, 156, 10.1111/j.1365-2745.2009.01594.x Day, 1965, Particle fractionation and particle-size analysis, Vol. 9, 1367 De Soyza, 1996, Effects of plant size on photosynthesis and water relations in the desert shrub Prosopis glandulosa (Fabaceae), Am. J. Bot., 83, 99, 10.1002/j.1537-2197.1996.tb13880.x Eldridge, 2005, Clumped and isolated trees influence soil nutrient levels in an Australian temperate box woodland, Plant Soil, 270, 331, 10.1007/s11104-004-1774-2 Grellier, 2013, Positive versus negative environmental impacts of tree encroachment in South Africa, Acta Oecol., 53, 1, 10.1016/j.actao.2013.08.002 Hagos, 2005, Soil enrichment by Acacia mellifera subsp. detinens on nutrient-poor sandy soil in a semi-arid southern African savanna, J. Arid Environ., 61, 47, 10.1016/j.jaridenv.2004.08.003 Hunter, 1975, New techniques and equipment for routine soil/plant analytical procedures, 455 Isichei, 1992, The effects of tree canopy cover on soil fertility in a Nigerian savanna, J. Trop. Ecol., 8, 329, 10.1017/S0266467400006623 Johnson, 2006, Double-funneling of trees: stemflow and root-induced preferential flow, Ecoscience, 13, 324, 10.2980/i1195-6860-13-3-324.1 Kambatuku, 2013, Nitrogen fertilisation reduces grass-induced N2 fixation of tree seedlings of semi-arid savannas, Plant Soil, 365, 307, 10.1007/s11104-012-1389-y Kambatuku, 2013, Overlap in soil water sources of savanna woody seedlings and grasses, Ecohydrology, 6, 464, 10.1002/eco.1273 Koranda, 2014, Fungal and bacterial utilization of organic substrates depends on substrate complexity and N availability, FEMS Microbiol. Ecol., 87, 142, 10.1111/1574-6941.12214 Kraaij, 2006, Effects of rain, nitrogen, fire and grazing on tree recruitment and early survival in bush-encroached savanna, South Africa, Plant Ecol., 186, 235, 10.1007/s11258-006-9125-4 Ludwig, 2001, Effects of nutrients and shade on tree-grass interactions in an East African savanna, J. Veg. Sci., 12, 579, 10.2307/3237009 Ludwig, 2004, The influence of savanna trees on nutrient, water and light availability and the understorey vegetation, Plant Ecol., 170, 93, 10.1023/B:VEGE.0000019023.29636.92 Manzoni, 2008, The global stoichiometry of litter nitrogen mineralization, Science, 321, 684, 10.1126/science.1159792 Manzoni, 2010, Stoichiometric controls on carbon, nitrogen, and phosphorus dynamics in decomposing litter, Ecol. Monogr., 80, 89, 10.1890/09-0179.1 Matasyoh, 2007, Chemical composition and antimicrobial activity of essential oil of Tarchonanthus camphoratus, Food Chem., 101, 1183, 10.1016/j.foodchem.2006.03.021 Mbatha, 2010, The effects of grazing, fire, nitrogen and water availability on nutritional quality of grass in semi-arid savanna, South Africa, J. Arid Environ., 72, 1294, 10.1016/j.jaridenv.2010.06.004 Menges, 2000, Population viability analyses in plants: challenges and opportunities, Trends Ecol. Evol., 15, 51, 10.1016/S0169-5347(99)01763-2 Mucina, 2006 Mudrak, 2014, Predictive modeling of spatial patterns of soil nutrients related to fertility islands, Landsc. Ecol., 29, 491, 10.1007/s10980-013-9979-5 Muller, 2013, Direct and indirect effects of termites on savanna tree-seedling growth, Plant Ecol., 214, 811, 10.1007/s11258-013-0209-7 Munzbergova, 2002, Acacia trees as keystone species in Negev desert ecosystems, J. Veg. Sci., 13, 227, 10.1111/j.1654-1103.2002.tb02043.x Mutai, 2009, Antimicrobial activity of Acacia mellifera extracts and lupane triterpenes, J. Ethnopharmacol., 123, 143, 10.1016/j.jep.2009.02.007 Passioura, 2002, Soil conditions and plant growth, Plant Cell Environ., 25, 311, 10.1046/j.0016-8025.2001.00802.x Perkins, 2013, Quick start guide to soil methods for ecologists, Perspect. Plant Ecol., 15, 237, 10.1016/j.ppees.2013.05.004 Ratajczak, 2011, Positive feedbacks amplify rates of woody encroachment in mesic tallgrass prairie, Ecosphere, 2, a121, 10.1890/ES11-00212.1 Ravi, 2010, Interactions between soil erosion processes and fires: implications for the dynamics of fertility islands, Rangel. Ecol. Manag., 63, 267, 10.2111/REM-D-09-00053.1 Schaefer, 1985, The failure of nitrogen and lignin control of decomposition in a North American desert, Oecologia, 65, 382, 10.1007/BF00378913 Scheffer, 2010 Schleicher, 2011, Changes of woody plant interaction and spatial distribution between rocky and sandy soil areas in a semi-arid savanna, South Africa, J. Arid Environ., 75, 270, 10.1016/j.jaridenv.2010.10.003 Schlesinger, 1996, On the spatial pattern of soil nutrients in desert ecosystems, Ecology, 77, 364, 10.2307/2265615 Scholes, 1993 Simberloff, 2012, The natives are restless, but not often and mostly when disturbed, Ecology, 93, 598, 10.1890/11-1232.1 Smet, 2006, Soil quality gradients around water-points under different management systems in a semi-arid savanna, South Africa, J. Arid Environ., 64, 251, 10.1016/j.jaridenv.2005.04.014 Smit, 2004, An approach to tree thinning to structure southern African savannas for long-term restoration from bush encroachment, J. Environ. Manag., 71, 191, 10.1016/j.jenvman.2004.02.005 Throop, 2008, Shrub (Prosopis velutina) encroachment in a semidesert grassland: spatial–temporal changes in soil organic carbon and nitrogen pools, Glob. Chang. Biol., 14, 2420, 10.1111/j.1365-2486.2008.01650.x Treydte, 2007, Trees improve grass quality for herbivores in African savannas, Perspect. Plant Ecol., 8, 197, 10.1016/j.ppees.2007.03.001 Ward, 2011, What are the effects of substrate and grass removal on recruitment of Acacia mellifera seedlings in a semi-arid environment?, Plant Ecol., 212, 245, 10.1007/s11258-010-9818-6 Ward, 2013, Walter's two-layer hypothesis revisited: back to the roots!, Oecologia, 172, 617, 10.1007/s00442-012-2538-y Ward, 2014, A century of woody plant encroachment in a dry savanna near Kimberley in South Africa, Afr. J. Range For. Sci., 31, 107, 10.2989/10220119.2014.914974 Ward, 2017, An African grassland responds similarly to long-term fertilization to the Park Grass experiment, PLoS One, 12, e0177208, 10.1371/journal.pone.0177208 Weiner, 2004, Allocation, plasticity and allometry in plants, Perspect. Plant Ecol., 6, 207, 10.1078/1433-8319-00083 Weintraub, 2005, Nitrogen cycling and the spread of shrubs control changes in the carbon balance of Arctic tundra ecosystems, BioScience, 55, 408, 10.1641/0006-3568(2005)055[0408:NCATSO]2.0.CO;2 Wiegand, 2005, Multi-scale patterns and bush encroachment in an arid savanna with a shallow soil layer, J. Veg. Sci., 16, 311, 10.1111/j.1654-1103.2005.tb02369.x Wiegand, 2006, A patch-dynamics approach to savanna dynamics and woody plant encroachment – insights from an arid savanna, Perspect. Plant Ecol., 7, 229, 10.1016/j.ppees.2005.10.001 Young, 1991, Growth and yield estimates in natural stands of leleshwa (Tarchonanthus camphoratus), For. Ecol. Manag., 41, 309, 10.1016/0378-1127(91)90111-8 Zhao, 2009, Terpenes from Eupatorium adenophorum and their allelopathic effects on Arabidopsis seed germination, J. Agric. Food Chem., 57, 478, 10.1021/jf803023x Zuur, 2009