Sampling size required for determining soil carbon and nitrogen properties at early establishment of second rotation hoop pine plantations in subtropical Australia
Blumfield, Tim J., Xu, Zhi-Hong, & Prasolova, Nina (2007) Sampling size required for determining soil carbon and nitrogen properties at early establishment of second rotation hoop pine plantations in subtropical Australia. Pedosphere, 17(6), pp. 706-711.
Investigations into forest soils face the problem of the high level of spatial variability that is an inherent property of all forest soils. In order to investigate the effect of changes in residue management practices on soil properties in hoop pine (Araucaria cunninghamii Aiton ex A. Cunn.) plantations of subtropical Australia it was important to understand the intensity of sampling effort required to overcome the spatial variability induced by those changes. Harvest residues were formed into windrows to prevent nitrogen (N) losses through volatilisation and erosion that had previously occurred as a result of pile and burn operations. We selected second rotation (211) hoop pine sites where the windrows (10-15 m apart) had been formed 1, 2 and 3 years prior to sampling in order to examine the spatial variability in soil carbon (C) and N and in potential mineralisable N (PMN) in the areas beneath and between (inter-) the windrows. We examined the implications of soil variability on the number of samples required to detect differences in means for specific soil properties, at different ages and at specified levels of accuracy. Sample size needed to accurately reflect differences between means was not affected by the position where the samples were taken relative to the windrows but differed according to the parameter to be sampled. The relative soil sampling size required for detecting differences between means of a soil property in the inter-windrow and beneath-windrow positions was highly dependent on the soil property assessed and the acceptable relative sampling error. An alternative strategy for soil sampling should be considered, if the estimated sample size exceeds 50 replications. The possible solution to this problem is collection of composite soil samples allowing a substantial reduction in the number of samples required for chemical analysis without loss in the precision of the mean estimates for a particular soil property.
Impact and interest:
Citation counts are sourced monthly from and citation databases.
These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.
Citations counts from theindexing service can be viewed at the linked Google Scholar™ search.
|Item Type:||Journal Article|
|Subjects:||Australian and New Zealand Standard Research Classification > ENVIRONMENTAL SCIENCES (050000) > SOIL SCIENCES (050300) > Soil Sciences not elsewhere classified (050399)|
|Divisions:||Current > QUT Faculties and Divisions > Division of Technology, Information and Library Services|
|Deposited On:||24 May 2009 21:52|
|Last Modified:||10 Aug 2011 18:28|
Repository Staff Only: item control page