Supplement 1. The complete data set.

<h2>File List</h2><div> <p><a href="fertilization_treatments.csv">fertilization_treatments.csv</a> (MD5: 89bc45540bf3305cb2ef152cc68eaa0f)</p> <p><a href="root_abundance_and_morphological_traits.csv">root_abundance_and_morphological_traits.csv</a> (MD5: 31d7fb5a0a3858148df72683d227b914)</p> <p><a href="root_nutrients.csv">root_nutrients.csv</a> (MD5: 168940dbbfac94021d6be522d4978e9a)</p> <p><a href="mycorrhizal_colonization.csv">mycorrhizal_colonization.csv</a> (MD5: f83d44888e6ffd45b60544ae605873f1)</p> </div><h2>Description</h2><div> <p>fertilization_treatments.csv is a comma-separated text file containing the fertilization treatments of the Gigante experiment. Column definitions are:</p> <ol> <li>treatment is the fertilization treatment, where N = nitrogen, P = phosphorus and K = potassium. </li> <li>plot is the plot number associated with each treatment. </li> </ol> <p>root_abundance_and_morphological_traits.csv is a comma-separated text file containing the root abundance and morphological trait dataset. Column definitions are:</p> <ol> <li>plot is treatment plot. </li> <li>core is core sample number. </li> <li>size_class is root diameter size class, where 0 = 0–1 mm, 1 = 1–2 mm and 2 = 0–2 mm. </li> <li>biomass is root biomass in g/m2</li> <li>length is root length in m/m2</li> <li>t_den is root tissue density in g/cm3</li> <li>srl is specific root length in cm/g</li> <li>avg_diam is average root diameter in mm.</li> </ol> <p>root_nutrients.csv is a comma-separated text file containing the nutrient content of root tissue samples. Column definitions are:</p> <ol> <li>plot is treatment plot</li> <li>size_class is root diameter size class, where 0 = 0–1 mm, 1 = 1–2 mm and 2 = 0–2 mm. </li> <li>N is root tissue nitrogen concentration (%).</li> <li>C is root tissue carbon concentration (%).</li> <li>P is root tissue phosphorus concentration (ppm).</li> <li>K is root tissue potassium concentration (ppm).</li> </ol> <p>mycorrhizal_colonization.csv is a comma-separated text file containing mycorrhizal colonization dataset. Column definitions are:</p> <ol> <li>plot is treatment plot.</li> <li>arb_per is colonization of arbuscules expressed as a percent of root length</li> <li>ves_per is colonization of vesicles expressed as a percent of root length</li> <li>hyp_per is colonization of hyphae expressed as a percent of root length</li> <li>tot_per is total colonization expressed as a percent of root length</li> <li>arb_len is colonization of arbuscules expressed as root length (cm).</li> <li>ves_len is colonization of vesicles expressed as root length (cm).</li> <li>hyp_len is colonization of hyphae expressed as root length (cm).</li> <li>tot_len is total colonization expressed as root length (cm).</li> </ol> </div

Available Mo and P in organic soils and Mo recovery from tannic acid solutions.

<p>A) Fraction of available (resin-extractable) Mo and P in O horizon soils averaged across six forest sites. B) Recovery of Mo and P (resin-extractable) after addition and 20–25 hours of incubation of molybdate and phosphate to freshly sampled O horizon soils of six forest sites. C) Recovery of Mo (resin-extractable) from 0.1 mM solutions of Mo and increasing concentrations of tannic acid (<i>n</i> = 6) relative to tannic-acid free controls. Values represent means ± s.e.m.</p

Nitrogenase activity (Acetylene reduction activity in nmol C₂H₂ g⁻¹ h⁻¹) in response to additions of P to soils from six forest sites (mean (s.e.m.); <i>n</i> = 5.

<p>Nitrogenase activity (Acetylene reduction activity in nmol C₂H₂ g⁻¹ h⁻¹) in response to additions of P to soils from six forest sites (mean (s.e.m.); <i>n</i> = 5.</p

Supplement 1. All data sets analyzed in this article.

<h2>File List</h2><blockquote> <p><a href="Data.txt">Data.txt</a></p> </blockquote><h2>Description</h2><blockquote> <p>The data.txt file is a tab-delimited ascii file. It contains all response variables presented in this article. The first row contains the capitalized variable names used in column definitions below.</p> <p>Column definitions:</p> <p>1. PLOT – An integer to identify the 32 experimental plots</p> <p>2. N – A value of 1 (one) identifies an N addition plot. A value of 0 (zero) identifies a plot that did not receive added N.</p> <p>3. P – A value of 1 (one) identifies a P addition plot. A value of 0 (zero) identifies a plot that did not receive added P.</p> <p>4. K – A value of 1 (one) identifies a K addition plot. A value of 0 (zero) identifies a plot that did not receive added K.</p> <p>5. BLOCK – An integer to identify the two blocks within each replicate. In the balanced, incomplete blocks design, one block in each replicate includes the treatments +N, +P, +K and +NPK and the      second block in each replicate includes the treatments CONTROL, +NP, +NK and +PK. Values are 0 (zero) or 1 (one).</p> <p>6. REP - An integer to identify the four replicates of the factorial NPK experiment.</p> <p>7. RGR14_25 – The relative growth rate between 1997 and 2000 for saplings with DBH between 10 and 24 mm DBH in 1997.</p> <p>8. RGR46_25 – The relative growth rate between 2000 and 2008 for saplings with DBH between 10 and 24 mm DBH in 2000.</p> <p>9. RGR14_50  – The relative growth rate between 1997 and 2000 for saplings with DBH between 25 and 49 mm DBH in 1997.</p> <p>10. RGR46_50 – The relative growth rate between 2000 and 2008 for saplings with DBH between 25 and 49 mm DBH in 2000.</p> <p>11. RGR14_100 – The relative growth rate between 1997 and 2000 for saplings with DBH between 50 and 99 mm DBH in 1997.</p> <p>12. RGR46_100 – The relative growth rate between 2000 and 2008 for saplings with DBH between 50 and 99 mm DBH in 2000.</p> <p>13. RGR14_CAN – The relative growth rate between 1997 and 2000 for saplings with DBH greater than 99 mm DBH in 1997.</p> <p>14. RGR46_CAN – The relative growth rate between 2000 and 2008 for saplings with DBH greater than 99 mm DBH in 2000.</p> <p>15. ANPP9800 – Above-ground net primary production between 1998 and 2000. ANPP is the sum of wood and fine litter production. Units are Mg ha^-1 yr^-1. </p> <p>16. ANPP0008 – Above-ground net primary production between 2000 and 2008. ANPP is the sum of wood and fine litter production. Units are Mg ha^-1 yr^-1. </p> <p>17. F2000_5CM – Fine root biomass between 0 and 5 cm depth in April 2000. Fine roots are < 2 mm in diameter. Units are kg m^-3.</p> <p>18. C2000_5CM – Coarse root biomass between 0 and 5 cm depth in April 2000. Coarse root diameters are between 2 and 5 mm. Units are kg m^-3. These data were not analyzed due to the large numbers of zeros, but are included here to facilitate comparison with other studies.</p> <p>19. F2008_5CM – Fine root biomass between 0 and 5 cm depth in November 2008. Fine roots are < 2 mm in diameter. Units are kg m^-3.</p> <p>20. C2008_5CM – Coarse root biomass between 0 and 5 cm depth in November 2008. Coarse root diameters are between 2 and 5 mm. Units are kg m^-3. These data were not analyzed due to the large numbers of zeros, but are included here to facilitate comparison with other studies.</p> <p>21. F2009_5CM – Fine root biomass between 0 and 5 cm depth in April 2009. Fine roots are < 2 mm in diameter. Units are kg m^-3.</p> <p>22. C2009_5CM – Coarse root biomass between 0 and 5 cm depth in April 2009. Coarse root diameters are between 2 and 5 mm. Units are kg m^-3. These data were not analyzed due to the large numbers of zeros, but are included here to facilitate comparison with other studies.</p> <p>23. F2000_10CM – Fine root biomass between 5 and 10 cm depth in April 2000. Fine roots are < 2 mm in diameter. Units are kg m^-3.</p> <p>24. C2000_10CM – Coarse root biomass between 5 and 10 cm depth in April 2000. Coarse root diameters are between 2 and 5 mm. Units are kg m^-3. These data were not analyzed due to the large numbers of zeros, but are included here to facilitate comparison with other studies.</p> <p>25. F2008_10CM – Fine root biomass between 5 and 10 cm depth in November 2008. Fine roots are < 2 mm in diameter. Units are kg m^-3.</p> <p>26. C2008_10CM – Coarse root biomass between 5 and 10 cm depth in November 2008. Coarse root diameters are between 2 and 5 mm. Units are kg m^-3. These data were not analyzed due to the large numbers of zeros, but are included here to facilitate comparison with other studies.</p> <p>27. F2009_10CM – Fine root biomass between 5 and 10 cm depth in April 2009. Fine roots are < 2 mm in diameter. Units are kg m^-3.</p> <p>28. C2009_10CM – Coarse root biomass between 5 and 10 cm depth in April 2000. Coarse root diameters are between 2 and 5 mm. Units are kg m^-3. These data were not analyzed due to the large numbers of zeros, but are included here to facilitate comparison with other studies.</p> <p>29. L_1998 – Leaf litter production in 1998. Units are Mg ha^-1 yr^-1. </p> <p>30. F_1998 – Production of reproductive structures in 1998. Units are Mg ha^-1 yr^-1. </p> <p>31. B_1998 – Small branch (< 2 cm in diameter) production in 1998. Units are Mg ha^-1 yr^-1. </p> <p>32. D_1998 – Production of frass, dust and other small particles in 1998. Units are Mg ha^-1 yr^-1.</p> <p>33. T_1998 – Total fine litter production in 1998. Units are Mg ha^-1 yr^-1.</p> <p>34. L_1999 – Leaf litter production in 1999. Units are Mg ha^-1 yr^-1. </p> <p>35. F_1999 – Production of reproductive structures in 1999. Units are Mg ha^-1 yr^-1. </p> <p>36. B_1999 – Small branch (< 2 cm in diameter) production in 1999. Units are Mg ha^-1 yr^-1. </p> <p>37. D_1999 – Production of frass, dust and other small particles in 1999. Units are Mg ha^-1 yr^-1.</p> <p>38. T_1999 – Total fine litter production in 1999. Units are Mg ha^-1 yr^-1.</p> <p>39. L_2000 – Leaf litter production in 2000. Units are Mg ha^-1 yr^-1. </p> <p>40. F_2000 – Production of reproductive structures in 2000. Units are Mg ha^-1 yr^-1. </p> <p>41. B_2000 – Small branch (< 2 cm in diameter) production in 2000. Units are Mg ha^-1 yr^-1. </p> <p>42. D_2000 – Production of frass, dust and other small particles in 2000. Units are Mg ha^-1 yr^-1.</p> <p>43. T_2000 – Total fine litter production in 2000. Units are Mg ha^-1 yr^-1.</p> <p>44. L_2001 – Leaf litter production in 2001. Units are Mg ha^-1 yr^-1. </p> <p>45. F_2001 – Production of reproductive structures in 2001. Units are Mg ha^-1 yr^-1. </p> <p>46. B_2001 – Small branch (< 2 cm in diameter) production in 2001. Units are Mg ha^-1 yr^-1. </p> <p>47. D_2001 – Production of frass, dust and other small particles in 2001. Units are Mg ha^-1 yr^-1.</p> <p>48. T_2001 – Total fine litter production in 2001. Units are Mg ha^-1 yr^-1.</p> <p>49. L_2002 – Leaf litter production in 2002. Units are Mg ha^-1 yr^-1. </p> <p>50. F_2002 – Production of reproductive structures in 2002. Units are Mg ha^-1 yr^-1. </p> <p>51. B_2002 – Small branch (< 2 cm in diameter) production in 2002. Units are Mg ha^-1 yr^-1. </p> <p>52. D_2002 – Production of frass, dust and other small particles in 2002. Units are Mg ha^-1 yr^-1.</p> <p>53. T_2002 – Total fine litter production in 2002. Units are Mg ha^-1 yr^-1.</p> <p>54. L_2003 – Leaf litter production in 2003. Units are Mg ha^-1 yr^-1. </p> <p>55. F_2003 – Production of reproductive structures in 2003. Units are Mg ha^-1 yr^-1. </p> <p>56. B_2003 – Small branch (< 2 cm in diameter) production in 2003. Units are Mg ha^-1 yr^-1. </p> <p>57. D_2003 – Production of frass, dust and other small particles in 2003. Units are Mg ha^-1 yr^-1.</p> <p>58. T_2003 – Total fine litter production in 2003. Units are Mg ha^-1 yr^-1.</p> <p>59. L_2004 – Leaf litter production in 2004. Units are Mg ha^-1 yr^-1. </p> <p>60. F_2004 – Production of reproductive structures in 2004. Units are Mg ha^-1 yr^-1. </p> </blockquote><p>...</p

Appendix A. Maps showing the location of the study site, its topography, and locations of each experimental plot.

Maps showing the location of the study site, its topography, and locations of each experimental plot