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Table 1 Soil and plant responses to rainfall, Si-application and simulated grazing (clipping) treatments from linear/mixed models

From: Silicon uptake by a pasture grass experiencing simulated grazing is greatest under elevated precipitation

Response variable Fig. Rainfall Si-application Clipping Rainfall × Si–application Rainfall × Clipping Si–application × Clipping Rainfall × Si–application × Clipping
F 2,60 P F 1,60 P F 1,60 P F 2,60 P F 2,60   F 1,60   F 2,60  
Soil characteristics
 Soil moisture 1B 364.80 < 0.001 22.47 < 0.001 0.04 0.850 6.87 0.002 0.03 0.970 0.04 0.833 0.44 0.646
 Soil Sib 2A 3.08 0.053 59.63 < 0.001 1.41 0.240 1.96 0.150 0.41 0.667 0.02 0.903 0.04 0.959
 Soil C – 2.66 0.078 2.41 0.125 0.55 0.461 0.10 0.908 0.28 0.760 0.01 0.984 0.97 0.386
 Soil Na – 2.37 0.102 0.01 0.952 0.05 0.819 0.16 0.856 0.77 0.468 0.01 0.927 1.06 0.352
Plant growth
 Heighta – 5.89 0.005 4.29 0.043 0.96 0.332 0.34 0.715 0.16 0.852 1.26 0.266 0.05 0.956
 Tiller number 1C 43.95 < 0.001 1.27 0.265 5.57 0.022 2.15 0.125 0.46 0.632 0.01 0.953 0.09 0.913
 Root massa 1D 9.33 < 0.001 2.99 0.089 0.64 0.426 0.78 0.465 0.32 0.726 0.44 0.512 0.21 0.814
Plant chemistry
 Root Si 2B 4.02 0.023 0.01 0.972 7.28 0.009 0.24 0.789 0.01 0.998 0.07 0.796 0.04 0.960
 Shoot Si 2B 40.78 < 0.001 0.88 0.353 42.04 < 0.001 2.83 0.066 2.30 0.109 0.01 0.963 0.41 0.664
 Root/shoot Sib 2B 18.75 < 0.001 1.44 0.235 12.42 < 0.001 1.85 0.166 0.02 0.979 0.01 0.992 0.02 0.984
 Root C 2C 7.60 < 0.001 0.13 0.720 5.86 0.019 0.34 0.714 0.32 0.725 0.01 0.953 0.25 0.780
 Shoot C 2C 32.31 < 0.001 0.03 0.862 52.14 < 0.001 2.76 0.072 2.14 0.127 0.07 0.788 0.08 0.920
 Root N – 31.58 < 0.001 0.01 0.934 3.77 0.057 0.08 0.923 1.29 0.282 0.37 0.545 0.35 0.706
 Shoot Nc – 1.72 0.187 0.07 0.796 0.99 0.323 2.89 0.063 2.74 0.072 0.21 0.651 0.09 0.918
  1. P-values highlighted in italic indicate significance (P < 0.05). Where appropriate, response variables were transformed (alog, bsquare root, cexp) before analysis. Height represents the height over time before the clipping treatment was applied
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BMC Ecology

ISSN: 1472-6785

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