Supplement 1. R scripts for conducting clear sky PAR simulations described in the main text.

<h2>File List</h2><div> <p><a href="Clear Sky PAR Model.txt">Clear Sky PAR Model.txt</a> (MD5: 487aee68581be90fc60476a2c3af1b2d)</p> </div><h2>Description</h2><div> <p>The code included in <i>Clear Sky PAR Model.R</i> allows conducting the model of clear sky PAR used for calibration of PAR sensors as described in the methods section of the main text.</p> </div

Characteristics of tree species selected for analysis of foliar properties.

<p>*Across all study sites, α = selected for individual species response analyses.</p

Soil properties for all successional and primary (Pr) forest study sites.

<p>*Weak Bray Extraction,</p><p>**Strong Bray Extraction,</p>€<p>Adjusted for mass >2 mm,</p><p>***Cation Exchange Capacity calculated as the sum of Ca, K, Mg, Na and H (meq/100 g).</p

Foliar δ¹⁵N and δ¹³C values versus stand age and species successional status.

<p>Significant linear regressions are shown in grey.</p

Best subsets models of leaf traits versus stand age, species successional status, and Principal Component Analysis (PCA) derived gradients in stand biomass and structure, and soil texture and fertility.

<p>Data represents the <i>t</i>-ratio (<i>F</i>-ratio) and <i>P</i>-value significance, with increasing * representing <i>P</i>-values of 0.1, 0.05, 0.01, and 0.001, respectively, and φ <0.0001.</p

Regressions of foliar variables versus stand age (years)/species successional status (years).

<p>Statistics provided are Adj-<i>R</i>² (F) <i>df</i> and <i>P</i>-value. Model comparisons are conducted using the F-test in R and <i>P</i>-values are presented as: blank <0.1, *<0.05, **<0.01, ***<0.001, ****<0.0001.</p

Stand characteristics of all successional and primary (Pr) forest study sites (mean±std. dev.).

<p>*Crown Exposure (CE) index, **Diameter at Breast Height (1.3 m), ***Chao-Jaccard community composition similarity versus primary forest sites.</p

Percentage total living trees in understory and overstory crown exposure (CE) positions; 1–3, and 4–5, respectively.

<p>Stand development phases (top) correspond to those described by Waring and Running (2007) <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0086042#pone.0086042-Waring1" target="_blank">[24]</a> and Oliver and Larson (1990) <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0086042#pone.0086042-Oliver1" target="_blank">[25]</a>.</p

Foliar-minus-soil δ¹⁵N and δ¹³C values versus stand age and species successional status.

<p>Significant linear regressions are shown in grey.</p

Selected soil properties for successional forest study sites.

<p>Significant linear regressions are shown in grey (<i>N</i> = 13). Linear regressions for soil δ¹⁵N were significant using separate depth points (<i>N = </i>39) and for soil δ¹³C following exclusion of the 7 year old stand outlier (<i>N</i> = 12).</p