Abstract
We investigated soil exploration by roots and plant growth in a heterogeneous environment to determine whether roots can selectively explore a nutrient-rich patch, and how nutrient heterogeneity affects biomass allocation and total biomass before a patch is reached. Lolium perenne L. plants were grown in a factorial experiment with combinations of fertilization (heterogeneous and homogeneous) and day of harvest (14, 28, 42, or 56 days after transplanting). The plant in the heterogeneous treatment was smaller in its mean total biomass, and allocated more biomass to roots. The distributions of root length and root biomass in the heterogeneous treatment did not favor the nutrient-rich patch, and did not correspond to the patchy distribution of inorganic nitrogen. Specific root length (length/biomass) was higher and root elongation was more extensive both laterally and vertically in the heterogeneous treatment. These characteristics may enable plants to acquire nutrients efficiently and increase the probability of encountering nutrient-rich patches in a heterogeneous soil. However, heterogeneity of soil nutrients would hold back plant growth before a patch was reached. Therefore, although no significant selective root placement in the nutrient-rich patch was observed, plant growth before reaching nutrient-rich patches differed between heterogeneous and homogeneous environments.
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References
Benjamin Y, Hochberg Y (1995) Controlling the false discovery rate—a practical and powerful approach to multiple testing. J R Stat Soc B 57:289–300
Bilbrough CJ, Caldwell MM (1995) The effects of shading and N status on root proliferation in nutrient patches by the perennial grass Agropyron desertorum in the field. Oecologia 103:10–16
Birch CPD, Hutchings MJ (1994) Exploitation of patchily distributed soil resources by the clonal herb Glechoma hederacea. J Ecol 82:653–664
Bloom AJ, Chapin FSIII, Mooney HA (1985) Resource limitation in plants—an economic analogy. Annu Rev Ecol Syst 16:363–392
Campbell BD, Grime JP, Mackey JML (1991) A trade-off between scale and precision in resource foraging. Oecologia 87:532–538
Casper BB, Cahill JF Jr, Jackson RB (1999) Plant competition in spatially heterogeneous environments. In: Hutchings MJ, John EA, Stewart AJA (eds) The ecological consequences of environmental heterogeneity. Blackwell, Oxford, pp 111–130
Casper BB, Schenk HJ, Jackson RB (2003) Defining a plant’s belowground zone of influence. Ecology 84:2313–2321
Crawley MJ (2005) Statistics: an introduction using R. Wiley, West Sussex
Crick JC, Grime JP (1987) Morphological plasticity and mineral nutrient capture in two herbaceous species of contrasted ecology. New Phytol 107:403–414
Drew MC, Saker LR, Ashley TW (1973) Nutrient supply and the growth of the seminal root system in barley. I. The effect of nitrate concentration on the growth of axes and laterals. J Exp Bot 24:1189–1202
Einsmann JC, Jones RH, Mou P, Mitchell RJ (1999) Nutrient foraging traits in 10 co-occurring plant species of contrasting life forms. J Ecol 87:609–619
Fitter AH (1976) Effects of nutrient supply and competition from other species on root growth of Lolium perenne in soil. Plant Soil 45:177–189
Grime JP, Hodgson JG, Hunt R (1988) Comparative plant ecology—a functional approach to common British species. Unwin Hyman, London
Hodge A (2004) The plastic plant: root responses to heterogeneous supplies of nutrients. New Phytol 162:9–24
Hodge A, Stewart J, Robinson D, Griffiths BS, Fitter AH (1998) Root proliferation, soil fauna and plant nitrogen capture from nutrient-rich patches in soil. New Phytol 139:479–494
Hodge A, Robinson D, Griffiths BS, Fitter AH (1999) Why plants bother: root proliferation results in increased nitrogen capture from an organic patch when two grasses compete. Plant Cell Environ 22:811–820
Huante P, Rincón E, Chapin FSIII (1998) Foraging for nutrients, responses to changes in light, and competition in tropical deciduous tree seedlings. Oecologia 117:209–216
Huitema BE (1980) The analysis of covariance and alternatives. Wiley, New York
Hutchings MJ, John EA, Stewart AJA (1999) The ecological consequences of environmental heterogeneity. 40th Symposium on the Ecological Consequences of Environmental Heterogeneity. University of Sussex. Blackwell, Oxford
Hutchings MJ, John EA, Wijesinghe DK (2003) Toward understanding the consequences of soil heterogeneity for plant populations and communities. Ecology 84:2322–2334
Jackson RB, Caldwell MM (1993) Geostatistical patterns of soil heterogeneity around individual perennial plants. J Ecol 81:683–692
Kimura K, Yamasaki S (2003) Accurate root length and diameter measurement using NIH image: use of Pythagorean distance for diameter estimation. Plant Soil 254:305–315
Malamy JE (2005) Intrinsic and environmental response pathways that regulate root system architecture. Plant Cell Environ 28:67–77
Marschner H (1995) Mineral nutrition of higher plants, 2nd edn. Academic, London
Neatrour MA, Jones RH, Golladay SW (2007) Responses of three floodplain tree species to spatial heterogeneity in soil oxygen and nutrients. J Ecol 95:1274–1283
Rajaniemi TK, Reynolds HL (2004) Root foraging for patchy resources in eight herbaceous plant species. Oecologia 141:519–525
Robinson D (1994) The responses of plants to non-uniform supplies of nutrients. New Phytol 127:635–674
Robinson D, Rorison IH (1983) A comparison of the responses of Lolium perenne L., Holcus lanatus L. and Deschampsia flexuosa (L.) Trin. to a localized supply of nitrogen. New Phytol 94:263–273
Robinson D, Hodge A, Griffiths BS, Fitter AH (1999) Plant root proliferation in nitrogen-rich patches confers competitive advantage. Proc R Soc London Ser B Biol Sci 266:431–435
Sokal RP, Rohlf FJ (1995) Biometry: the principles and practice of statistics in biological research, 3rd edn. Freeman, New York
Verhoeven KJF, Simonsen KL, McIntyre LM (2005) Implementing false discovery rate control: increasing your power. Oikos 108:643–647
Weiner J (1990) Asymmetric competition in plant populations. Trends Ecol Evol 5:360–364
Wijesinghe DK, John EA, Beurskens S, Hutchings MJ (2001) Root system size and precision in nutrient foraging: responses to spatial pattern of nutrient supply in six herbaceous species. J Ecol 89:972–983
Zar JH (1999) Biostatistical analysis, 4th edn. Prentice Hall, New Jersey
Zhang H, Forde BG (1998) An Arabidopsis MADS box gene that controls nutrient-induced changes in root architecture. Science 279:407–409
Acknowledgments
We are grateful to Prof. Nobuhiro Kaneko and Dr. Reiji Fujimaki of the laboratory of Soil Ecology in Yokohama National University for their help in the soil analyses and their constructive discussion. Two anonymous reviewers and the handling editor made constructive comments on our manuscript. Part of this study was supported by grants from the Japan Society for the Promotion of Science to J.I.S.
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Nakamura, R., Kachi, N. & Suzuki, JI. Root growth and plant biomass in Lolium perenne exploring a nutrient-rich patch in soil. J Plant Res 121, 547–557 (2008). https://doi.org/10.1007/s10265-008-0183-7
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DOI: https://doi.org/10.1007/s10265-008-0183-7