4.6 Article

Soil microbial responses to elevated phosphorus and pH in acidic temperate deciduous forests

期刊

BIOGEOCHEMISTRY
卷 109, 期 1-3, 页码 189-202

出版社

SPRINGER
DOI: 10.1007/s10533-011-9619-6

关键词

Enzyme activity; Lime fertilization; Phosphorus fertilization; PLFA; Temperate forests

资金

  1. National Science Foundation [DEB 0918681, DEB 0918167]
  2. Direct For Biological Sciences
  3. Division Of Environmental Biology [0918167] Funding Source: National Science Foundation
  4. Division Of Environmental Biology
  5. Direct For Biological Sciences [0918681] Funding Source: National Science Foundation

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Although northern temperate forests are generally not considered phosphorus (P) limited, ecosystem P limitation may occur on highly weathered or strongly acidic soils where bioavailable inorganic P is low. In such environments, soil organisms may compensate by increasing the utilization of organic P via the production of extracellular enzymes to prevent limitation. In this study, we experimentally increased available P and/or pH in several acidic eastern deciduous forests underlain by glaciated and unglaciated soils in eastern Ohio, USA. We hypothesized that where inorganic P is low; soil microbes are able to access organic P by increasing production of phosphatase enzymes, thereby overcoming biogeochemical P limitations. We measured surface soil for: available P pools, N mineralization and nitrification rates, total C and N, enzymes responsible for C, N, and P hydrolysis, and microbial community composition (PLFA). Increasing surface soil pH a whole unit had little effect on microbial community composition, but increased N cycling rates in unglaciated soils. Phosphorus additions suppressed phosphatase activities over 60% in the unglaciated soils but were unchanged in the glaciated soils. All treatments had minimal influence on microbial biomass, but available pools of P strongly correlated with microbial composition. Microbes may be dependent on sources of organic P in some forest ecosystems and from a microbial perspective soil pH might be less important overall than P availability. Although our sampling was conducted less than 1 year after treatment initiation, microbial community composition was strongly influenced by available P pools and these effects may be greater than short-term increases in soil pH.

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