Journal Title
Title of Journal: Environmental Management
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Abbravation: Environmental Management
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Publisher
Springer-Verlag
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Authors: JeanNicolas Poussart Jonas Ardö Lennart Olsson
Publish Date: 2004/05/12
Volume: 33, Issue: 1, Pages: S416-S425
Abstract
Reliable and effective verification of soil carbon sequestration is required for quantification of projectbased greenhouse gas mitigation Direct soil sampling is necessary for measurements at field level In this study soil samples from a semiarid agroecosystem of the Sudan were statistically analyzed to evaluate if changes in soil organic carbon SOC over time or space were detectable or not given a certain sample size One hundred samples were taken from each of three fields The data collected did not respect normality and parametric methods such as the minimum detectable difference MDD could not be used to relate with confidence the number of samples required to detect specific changes For this reason a method incorporating a nonparametric test into a bootstrap routine was developed to calculate the probabilities that a test will detect the differences between treatment groups for specified sample sizes The nonparametric approach used is a simple way of relating sample sizes detectable differences and the probabilities of detection making it flexible for any study affected by data nonnormality Data from different simulated composite sampling schemes were also combined with a bootstrap routine in order to quantify the averages and 95 confidence intervals of the variability estimates variance necessary for parametric sample size calculations The variance decreased almost by half each time the number of cores per samples doubledWe would like to thank Chris E Johnson Associate Professor at the Department of Civil Environmental Engineering at Syracuse University and Janno Tuulik PhD candidate at the Department of Physical Geography and Ecosystems Analysis at Lund University as well as the reviewers for numerous valuable discussions and comments on the manuscript We are also grateful to the Sudanese personnel within the project “Community Based Range Lands Rehabilitation for Carbon Sequestration and Biodiversity” SUD/93/G31 SUD/96/017 for the help provided during the fieldwork This work was supported by the Swedish Research Council 62120011806 and the Crafoord Foundation Ref no 00782
Keywords:
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- Six Years of CO 2 Flux Measurements for a Moderately Grazed Mixed-Grass Prairie
- Mapping Locust Habitats in the Amudarya River Delta, Uzbekistan with Multi-Temporal MODIS Imagery
- Reforestation Strategies Amid Social Instability: Lessons from Afghanistan
- Satellite Monitoring of Urban Sprawl and Assessment of its Potential Environmental Impact in the Greater Toronto Area Between 1985 and 2005
- A Proposed Aquatic Plant Community Biotic Index for Wisconsin Lakes
- Assessing the Restoration Success of River Widenings: A Landscape Approach
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- Plant Communities, Soil Carbon, and Soil Nitrogen Properties in a Successional Gradient of Sub-Alpine Meadows on the Eastern Tibetan Plateau of China
- Sensitivity Analysis of Aggregated Indices for Integrated Assessment with a Case Study of the Mid-Atlantic Region
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