Description and field performance of the Walker Branch throughfall displacement experiment: 1993--1996

Hanson, P. J.; Todd, D. E.; Huston,; Joslin, J. D.; Croker, J.L.; Augé, Robert M.

doi:10.2172/296852

Cited by 39 publications

(31 citation statements)

References 30 publications

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“…Depth to bedrock at this location is approximately 30 m. The site was chosen because of its uniform slope, consistent soils, and a reasonably uniform distribution of vegetation. Quercus alba L., Quercus prinus L., and Acer rubrum L. dominate the site, but it also contains 16 other tree species (Hanson et al , 1998, 2001). Stand basal area averages 20–25 m 2 ha −1 .…”

Section: Site and Methodsmentioning

confidence: 99%

Effects of throughfall manipulation on soil nutrient status: results of 12 years of sustained wet and dry treatments

Johnson

Todd

Hanson

2008

Global Change Biology

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To investigate the potential effects of changing precipitation on forest ecosystems, the Throughfall Displacement Experiment (TDE) was established on Walker Branch Watershed, Tennessee, in 1993. Three different throughfall amounts were tested: À33% (DRY); ambient (no change, AMB); and 133% (WET). Throughfall manipulations had no statistically significant effects on total C, N, exchangeable Ca 2 1 , Mg 2 1 , bicarbonateextractable P, or extractable SO 4 2À in soils after 12 years of sustained treatments. Increased K 1 inputs in the WET treatment resulted in relative increases in exchangeable K 1 compared with the AMB and DRY treatments. Soil C, N, and extractable P declined in all treatments over the 12-year study, and the declines in N were inexplicably large. Field observations contrasted with earlier simulations from the Nutrient Cycling Model (NuCM), which predicted greater decreases in exchangeable K 1 , Ca 2 1 , Mg 2 1 , and extractable P in the order WET4AMB4DRY, and no change in C, N, and extractable SO 4 2À . The failure of the NuCM model to accurately predict observed changes is attributed to the lack of mechanisms for deep rooting and the transfer of throughfall K 1 from one plot to another in the model. Measurements of element availability using resin membranes during the final years showed higher values in wet and lower values in dry treatments compared with ambient conditions for mineral N, K, Mn, Zn, and Al, but the opposite for B, Ca, and Mg. In the cases of Ca and Mg, the patterns in resin values were similar to those at the soil exchange sites (greatest in the dry treatment) and appeared to reflect pretreatment differences. This study showed that while longer term changes in soil nutrients are likely to occur with changes in precipitation, potential changes over this 12-year interval were buffered by ecosystem processes such as deep rooting.

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Section: Site and Methodsmentioning

confidence: 99%

Effects of throughfall manipulation on soil nutrient status: results of 12 years of sustained wet and dry treatments

Johnson

Todd

Hanson

2008

Global Change Biology

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“…The research objectives were to rank these 18 species for (1) Climate in this region is characterized by cold winters and long frost-free summers. Mean annual temperature is about 14"C, and mean annual precipitation is about 1300 mm (Hanson et al 1998). …”

Section: Introductionmentioning

confidence: 99%

“…Soils are generally acidic and well weathered and are classified primarily as typic paleudults (Hanson et al 1998). (Fig.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Nonnative Invasive Plants in the DOE Oak Ridge National Environmental Research Park

Drake¹

2002

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“…TDR measurements were obtained biweekly during the growing season and approximately monthly during the dormant season. The TDR soil water content measurements were adjusted for the coarse fraction of these soils and converted to soil water potentials using laboratory-derived soil moisture retention curves for the A, A/E, and E/B horizons (Hanson et al 1998). …”

Section: Soil Water Content and Potentialmentioning

confidence: 99%

“…A detailed description of the TDE is provided by Hanson et al (1998) and Hanson et al (2001), both of which are included in Appendix A of this report. Experimental manipulation of hydrologic inputs at the TDE is accomplished by intercepting throughfall in approximately 2000 subcanopy troughs (0.3 × 5 m) suspended above the forest floor on a "dry" treatment plot and transferring the throughfall across a control plot for distribution onto a "wet" treatment plot.…”

Section: Introductionmentioning

confidence: 99%

Walker Branch Throughfall Displacement Experiment Data Report: Site Characterization, System Performance, Weather, Species Composition, and Growth

Cushman¹,

Hanson²,

Todd³

et al. 2001

Carbon Dioxide Information Analysis Center (CDIAC) Datasets

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Description and field performance of the Walker Branch throughfall displacement experiment: 1993--1996

Cited by 39 publications

References 30 publications

Effects of throughfall manipulation on soil nutrient status: results of 12 years of sustained wet and dry treatments

Effects of throughfall manipulation on soil nutrient status: results of 12 years of sustained wet and dry treatments

Assessment of Nonnative Invasive Plants in the DOE Oak Ridge National Environmental Research Park

Walker Branch Throughfall Displacement Experiment Data Report: Site Characterization, System Performance, Weather, Species Composition, and Growth

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