Influence of soil faunal communities on nitrogen dynamics in legume-based mesocosms
N. L. Schon A D , A. D. Mackay B , M. J. Hedley C and M. A. Minor AA Ecology, Institute of Natural Resources, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand.
B AgResearch Grasslands, Private Bag 11008, Palmerston North 4442, New Zealand.
C Soil and Earth Sciences, Institute of Natural Resources, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand.
D Corresponding author. Current address: AgResearch Lincoln, Private Bag 4749, Christchurch 8140, New Zealand. Email: nicole.schon@agresearch.co.nz
Soil Research 49(2) 190-201 https://doi.org/10.1071/SR10100
Submitted: 7 May 2010 Accepted: 27 August 2010 Published: 10 March 2011
Abstract
Soil invertebrates play an important part in nutrient supply. It has been suggested that invertebrates have the greatest influence on nitrogen (N) availability in soils of low N fertility, and therefore invertebrates may be less important in pastoral systems with high N inputs. The influence of invertebrates on N cycling, and the fate of 15N-labelled plant litter, in a low- or high-N environment and in a soil with low or high bulk density were explored by the introduction of different elements of the invertebrate community in constructed soil ryegrass–white clover mesocosms.
At high bulk density and low N, the N made available by invertebrates resulted in higher plant growth, without any increases in N losses to the environment. At high N, where pasture growth was not limited by N, the N made available by invertebrates increased both herbage N% and the amount of N in leachate. More of the 15N-labelled plant litter decomposed in high-N than low-N mesocosms. Invertebrates increased the plant uptake of surface-applied 15N plant litter. The influence of invertebrates was dependent on bulk density, suggesting that invertebrates in compacted soils improved soil structure and N availability. This mesocosm study highlights the important role of invertebrates in N supply across a range of soil conditions.
Additional keywords: compaction, earthworms, mesofauna, nematodes, nitrogen cycling.
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