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Gross nitrogen mineralisation rates in pastural soils and their relationships with organic nitrogen fractions, microbial biomass and protease activity under glasshouse conditions

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Gross nitrogen mineralisation rates in pastural soils and their relationships with organic nitrogen fractions, microbial biomass and protease activity under glasshouse conditions

Content Provider	Springer Nature Link
Author	Mishra, S. Di, H. J. Cameron, K. C. Monaghan, R. Carran, A.
Copyright Year	2005
Abstract	In this study, gross nitrogen (N) mineralisation rates were determined in six pasture soils (Fleming, Kairanga, Karapoti, Lismore, Templeton and Waikoikoi) from three different regions of New Zealand. The soils were kept under controlled soil water potential (−10 to −30 kPa) and temperature (12–20°C) conditions in a glasshouse. The gross N mineralisation rates ranged from 0.76 to 5.87 μg N g−1 soil day−1 in the six soils and were positively correlated with the amount of amino acid-N (AA-N), ammonia-N (NH3-N), total hydrolysable-N (TH-N), microbial biomass-carbon (MB-C), microbial biomass-N (MB-N), protease activity and organic C and N. A stepwise regression was used to generate equations that could best describe gross N mineralisation rates. Microbial biomass-carbon and AA-N were included in the equation that best described the gross N mineralisation rate: $$ \begin{aligned} {\text{Gross}}\,{\text{N}}\,{\text{mineralisation}}\,{\text{rate }}{\left( {\mu {\text{g}}\,{\text{N}}\,{\text{g}}^{{ - {\text{1}}}} \,{\text{soil day}}^{{ - {\text{1}}}} } \right)} & \\ = - 0.566 + 0.001{\left( {{\text{MB - C}}\,\mu {\text{g}}\,{\text{C}}\,{\text{g}}^{{ - {\text{1}}}} \,{\text{soil}}} \right)} + 0.002{\left( {{\text{AA - N}}\,\mu {\text{g}}\,{\text{N}}\,{\text{g}}^{{ - 1}} \,{\text{soil}}} \right)}{\text{.}} & \\ \end{aligned} $$ The total amounts of N mineralised over the 1-year period were equivalent to between 492 and 1,351 kg N ha−1 year−1. Assuming mineralisation continues at a steady state throughout the year, this represents between 12 and 26% of the total organic N mineralised per year in these pasture soils.
Starting Page	45
Ending Page	53
Page Count	9
File Format	PDF
ISSN	01782762
Journal	Biology and Fertility of Soils
Volume Number	42
Issue Number	1
e-ISSN	14320789
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-05-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Microbial biomass-C Microbial biomass-N N mineralisation Protease Pasture soils
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Microbiology

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