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An Accurate and Efficient Method for Sorting Biomass Extracted from Soil Cores Using Point-Intercept Sampling
 

Summary: An Accurate and Efficient Method for Sorting Biomass Extracted from Soil Cores Using
Point-Intercept Sampling
Rebecca C. Wenk,* John J. Battles, Randall D. Jackson, James W. Bartolome, and Barbara Allen-Diaz
ABSTRACT
We describe a point-intercept sampling technique that reduces the
time and therefore the cost associated with hand sorting biomass
extracted from soil cores. Typically, organic material that has been
extracted from soil cores is painstakingly separated into categories
such as roots, leaves, and unidentifiable organic matter so that each
can be weighed. With the point-intercept method, we spread the ex-
tracted organic material over a grid and record the category of ran-
domly located point intercepts within grid cells. The proportion of
each category determined via point intercepts is then attributed to the
total dry mass of the organic material. With a subset of our data, we
determined ordinary least squares regression relationships between
hand-sorted (census) and point-intercept (sample) estimates of the
belowground biomass components roots, aboveground detritus, and
soil organic matter. We then applied these regression models to the
remainder of our data, which had been hand sorted to serve as a
validation dataset. Using bootstrapped 95% confidence intervals of

  

Source: Allen-Diaz, Barbara - Department of Environmental Science Policy and Management, University of California at Berkeley

 

Collections: Environmental Sciences and Ecology