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Detecting nutrient pool changes in rocky forest soils
Author(s) -
Kulmatiski Andrew,
Vogt Daniel J.,
Siccama Thomas G.,
Beard Karen H.
Publication year - 2003
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj2003.1282
Subject(s) - coring , environmental science , sampling (signal processing) , soil science , soil water , basal area , nutrient , population , mineralogy , core sample , extrapolation , microsite , hydrology (agriculture) , geology , mathematics , core (optical fiber) , forestry , ecology , biology , statistics , geography , botany , materials science , physics , geotechnical engineering , seedling , detector , sociology , optics , composite material , drilling , metallurgy , demography
Microsite heterogeneity often complicates the accurate measurement of soil properties. Many sampling techniques have been developed to overcome this difficulty, but use of these techniques requires the direct comparison of measurements from each technique. In this paper, we present estimates of C and N pool sizes determined from two commonly used, but previously not compared, techniques. Composite coring (core) and excavation mensuration (pit) techniques were performed in glacially stratified Inceptisols of southern New England. Estimates of total C pool size (forest floor [FF] −15 cm) from the pit and core techniques were significantly correlated ( r 2 = 0.61, P < 0.0001) and very similar (5.64 ± 0.32 and 5.63 ± 0.29, respectively). However, the core technique reduced variance in the sample population, allowing fewer samples to detect a 10% change in nutrient storage (21 core vs. 29 pit samples). In addition, sampling each plot with the core technique required less than one‐half the sampling time of the pit technique. The pit technique, however, allowed quantitative sampling below 15 cm and direct measurement of large coarse fragments. Data from the pit technique revealed a strong exponential decline in nutrient storage with depth. This exponential decline allowed the extrapolation of C and N pools to greater depths. Carbon storage (kg m −2 ) was described by depth (cm) as: exp (5.53–0.04 depth); P < 0.0001. N storage (kg m −2 ) was described by depth (cm) and tree basal area (ba, m 2 ha −1 ) as: exp (3.280–0.025 depth– 0.003 ba); P < 0.0001. Our data suggest that composite core sampling is more efficient than, but well supplemented by, pit sampling.