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  • Seasonal changes in soil phosphorus and associated microbial properties under adjacent grassland and forest in New Zealand

    Author(s)
    Chen, CR
    Condron, LM
    Davis, MR
    Sherlock, RR
    Griffith University Author(s)
    Chen, Chengrong
    Year published
    2003
    Metadata
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    Abstract
    Land-use change from grassland to short rotation plantation forest can have significant impacts on soil nutrient dynamics and microbial processes. Seasonal dynamics of soil phosphorus (P) and associated microbial properties were investigated in upper (0-5 cm) soils under adjacent unimproved grassland and a 19-year-old forest stand (mixture of Pinus ponderosa and Pinus nigra). Afforestation of grassland ameliorated upper soil moisture and temperature regimes, resulting in reduced but less variable soil moisture beneath forest, and reduced temperature extremes, with soil being cooler under forest in summer, but warmer in winter. ...
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    Land-use change from grassland to short rotation plantation forest can have significant impacts on soil nutrient dynamics and microbial processes. Seasonal dynamics of soil phosphorus (P) and associated microbial properties were investigated in upper (0-5 cm) soils under adjacent unimproved grassland and a 19-year-old forest stand (mixture of Pinus ponderosa and Pinus nigra). Afforestation of grassland ameliorated upper soil moisture and temperature regimes, resulting in reduced but less variable soil moisture beneath forest, and reduced temperature extremes, with soil being cooler under forest in summer, but warmer in winter. Results from this study showed that levels of soil organic carbon (C), total nitrogen (N) and organic P fractions under grassland were consistently higher, but levels of inorganic P fractions (bicarbonate extractable Pi and total Pi), microbial biomass C and P, and phosphatase enzyme activities were lower compared with forest over all seasons. Similar seasonal patterns of soil P fractions under grassland and forest demonstrated that labile organic P was mineralized by increasing microbial activity to meet increasing plant demand in spring and summer, but accumulated as a result of increased organic inputs, slower plant growth and low microbial activity in late autumn and winter. It was concluded that P recycling was mainly driven by plant P demand and sustained by root litter inputs in the grassland ecosystem and leaf litter inputs in the forest ecosystem. Seasonal changes in environmental conditions (rainfall, soil moisture and temperature) influenced microbial processes involved in P cycling. Microbial biomass plays a pivotal role in P cycling. Annual release of P through microbial biomass was higher in the forest soil (16.1 kg ha-1) than in the grassland soil (13.9 kg ha-1). The turnover rate of biomass P was also higher in the forest soil (1.28 per year) than in the grassland soil (0.80 per year). In addition, abundant C and P (particularly labile forms) and high microbial and enzyme activities found in the forest floor highlight the importance of the forest floor in P cycling.
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    Journal Title
    Forest Ecology and management
    Volume
    177
    Issue
    1-3
    DOI
    https://doi.org/10.1016/S0378-1127(02)00450-4
    Copyright Statement
    © 2003 Elsevier : Reproduced in accordance with the copyright policy of the publisher : This journal is available online - use hypertext links.
    Subject
    Environmental sciences
    Biological sciences
    Agricultural, veterinary and food sciences
    Publication URI
    http://hdl.handle.net/10072/5965
    Collection
    • Journal articles

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