Evaluation of soil sampling schemes for geostatistical analyses: A case study for soil bulk density

1991 ◽  
Vol 71 (2) ◽  
pp. 165-176 ◽  
Author(s):  
T. Entz ◽  
C. Chang
Keyword(s):  
Bulk Density ◽  
Random Sampling ◽  
Soil Bulk Density ◽  
Soil Sampling ◽  
Sampling Scheme ◽  
Density Estimates ◽  
Density Measurements ◽  
Grid Sampling ◽  
Sampling Schemes

Sixteen soil sampling schemes were evaluated in a case study using geostatistical analyses to determine their impact on directional sample variograms and kriging. Soil bulk density measurements for each sampling scheme were obtained from an intensively sampled grid, and kriging was used to estimate the bulk densities not included in the sampling scheme. The kriged bulk density estimates for all sampling schemes were verified using a minimum of 6168 observed values. Grid sampling for this study required more samples than stratified random sampling and the stratified-grid sampling schemes, but the accuracy of the kriged estimates was comparable for all sampling schemes. Key words: Kriging, variogram, soil density

Spatial variability of soil porosity under reduced tillage in a Humo-Ferric Podzol

1995 ◽  
Vol 75 (1) ◽  
pp. 149-152 ◽  
Author(s):  
M. R. Carter
Keyword(s):  
Bulk Density ◽  
Prince Edward Island ◽  
Pore Space ◽  
Soil Bulk Density ◽  
Soil Sampling ◽  
Moisture Regime ◽  
Humid Climate ◽  
Soil Moisture Regime ◽  
Classical Statistics ◽  
Water Filled Pore Space

The spatial and random variability of soil bulk density, water-filled pore space and macroporosity, which are important indices of soil physical quality in a humid soil moisture regime, were studied in soil samples taken from direct-drilled rotations at Charlottetown, Prince Edward Island. Classical statistics indicated variation was low for bulk density (CV = 3.0–5.8%) and water-filled pore space (CV = 7.4–10.3%), and medium (CV = 15.7–29.6%) for macropore volume. Spatial variation determined using variograms indicated some degree of spatial structure. The ability of variograms to divide sample variance into random and spatial components allows improved estimation of soil sampling size and spacing. Key words: Geostatistics, soil sampling, direct-drilling, humid climate

scholarly journals Silage-corn harvesting machinery traffic effects on soil bulk density and water permeability

2013 ◽  
Vol 59 (No. 4) ◽  
pp. 136-140
Author(s):  
I. Ahmadi ◽  
H. Ghaur
Keyword(s):  
Bulk Density ◽  
Water Permeability ◽  
Soil Compaction ◽  
Field Experiments ◽  
Soil Bulk Density ◽  
Soil Sampling ◽  
Soil Porosity ◽  
Silty Clay ◽  
Water Permeability Coefficient ◽  
Loam Soil

Soil compaction caused by machinery traffic affects the growth of agricultural crops and also has environmental effects like soil damage and erosion. Field experiments were conducted to study the effects of repeated silage-corn harvesting machinery traffic on dry soil bulk density and porosity variations at three different sampling depths, moreover average water permeability coefficient of the examined silty clay loam soil was measured using the falling head method of water permeability test. The examined treatments which were applied while harvesting silage-corn with the combination of tractor, chopper and truck were the number of traffic passes and depths of soil sampling. Significant differences between soil compaction treatments were observed in bulk density and porosity of soil. Numerically, 22% increase in soil bulk density and 19% reduction in soil porosity were recorded due to the effect of two passes of the examined machineries over the field terrain comparing to the non-traffic treatment. Moreover; soil sampling at 0–10 cm and 20–30 cm depths resulted in the highest and the lowest soil porosity respectively.

scholarly journals A photogrammetry-based approach for soil bulk density measurements with an emphasis on applications to cosmogenic nuclide analysis

2020 ◽  
Author(s):  
Joel Mohren ◽  
Steven A. Binnie ◽  
Gregor M. Rink ◽  
Katharina Knödgen ◽  
Carlos Miranda ◽  
...  
Keyword(s):  
Bulk Density ◽  
Soil Bulk Density ◽  
Small Scale ◽  
Sampling Techniques ◽  
Soil Density ◽  
Density Measurements ◽  
Cosmogenic Nuclide ◽  
Accuracy And Precision ◽  
Single Lens

Abstract. The quantification of soil bulk density (ρB) is a cumbersome and time-consuming task when traditional soil density sampling techniques are applied. However, it can be important for terrestrial cosmogenic nuclide (TCN) production rate scaling when deriving ages or surface process rates from buried samples, in particular when short-lived TCN such as in situ 14C are applied. Here we show that soil density determinations can be made using structure-from-motion multi-view stereo (SfM-MVS) photogrammetry-based volume reconstructions of sampling pits. Accuracy and precision tests as found in the literature and as conducted in this study clearly indicate that photographs taken from both a consumer-grade digital single lens mirrorless (DSLM) and a smartphone camera are of sufficient quality to produce accurate and precise modelling results, i.e. to regularly reproduce the true volume and/or density by > 95 %. This finding holds also if a freeware-based computing workflow is applied. The technique has been used to measure ρB along three small-scale (

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