Ref ID: 11240
Ref Type: Journal
Authors: Chen, C. R., Condron, L. M., Davis, M. R., and Sherlock, R. R.
Pub Date: 2004
Journal Name: Biology and Fertility of Soils
Volume: 40
Issue:
Start Page: 313
End Page: 322
ISBN/ISSN:
Keywords: biomass/concentration/demand/dynamics/effect/experiment/glasshouse/grassland soils/impact/Lolium perenne/microbial biomass/new/New Zealand/organic/out/P/parameter/phosphatase activity/phosphorus/pine/Pinus/Pinus radiata/plant/process/property/radiata pine/respiration/response/root/soil/soil phosphorus/soils/species/study/water/water soluble organic carbon/science
Abstract: Soil P transformations are primarily mediated by plant root and soil microbial activity. A short term (40 weeks) glasshouse experiment with 15 grassland soils collected from around New Zealand was conducted to examine the impacts of ryegrass (Lolium perenne) and radiata pine (Pinus radiata) on soil microbial properties and microbiological processes involved in P dynamics. Results showed that the effect of plant species on soil microbial parameters varied greatly with soil type. Concentrations of microbial biomass C and soil respiration were significantly greater in 6 out of 15 soils under radiata pine compared with ryegrass, while there were no significant effects of plant species on these parameters in the remaining soils. However, microbial biomass P was significantly lower in 6 soils under radiata pine, while there were no significant effects of plant species on microbial biomass P in the remaining soils. The latter indicated that P was released from the microbial biomass in response to greater P demand by radiata pine. Levels of water soluble organic C were significantly greater in most soils under radiata pine, compared with ryegrass, which suggested that greater root exudation might have occurred under radiata pine. Activities of acid and alkaline phosphatase and phosphodiesterase were generally lower in most soils under radiata pine, compared with ryegrass. The findings of this study indicate that root exudation plays an important role in increased soil microbial activities, solubility of organic P and mineralization of organic P in soils under radiata pine.
Notes: Entered by Maria Ottenschlaeger (23/08/2005)
Reprint: Not in File
Program: SPF Sustainable Management
Project: B2
Deliverable: B2-1.2; B2-1.2
Confidentiality: Public
Availability: Authors
Report: Annual Report 2004/5
Type: Article
Address: chengrong.chen@mailbox.gu.edu.au
Misc 2: Published