Table S1. The 30 focal species or vegetation types, along with their mean and standard deviation (s.d.) and coefficient of variation (CV) values for the three field-measured traits. “Fixer” species are nitrogen fixers.

Nmass / Cmass
Species / Veg. Type / Veg. Type / Alliance community / n / Mean / s.d. / C.V. / Mean / s.d. / C.V.
Aesculus californica / deciduous tree / Aesculus californica woodland / 4 / 2.495 / 0.385 / 0.154 / 45.400 / 0.683 / 0.015
Adenostoma fasciculatum / evergreen shrub / Chaparral with A. fasciculatum / 6 / 1.188 / 0.234 / 0.197 / 50.167 / 0.393 / 0.008
Ceanothus cuneatus / fixer shrub / Chaparral with A. fasciculatum / 4 / 1.448 / 0.136 / 0.094 / 50.200 / 0.337 / 0.007
Ceanothus oliganthus / fixer shrub / Chaparral with A. fasciculatum / 4 / 1.573 / 0.259 / 0.164 / 49.425 / 0.519 / 0.010
Cercocarpus betuloides / fixer shrub / Chaparral with A. fasciculatum / 4 / 2.245 / 0.385 / 0.172 / 48.775 / 0.544 / 0.011
Artemisia californica / evergreen shrub / Coastal scrub / 4 / 1.728 / 0.143 / 0.083 / 47.000 / 0.400 / 0.009
Baccharis pilularis / evergreen shrub / Coastal scrub / 6 / 1.815 / 0.163 / 0.090 / 49.233 / 0.308 / 0.006
Rhamnus crocea / evergreen shrub / Coastal scrub / 4 / 1.705 / 0.241 / 0.141 / 46.725 / 0.457 / 0.010
Toxicodendron diversilobum / deciduous shrub / Coastal scrub / 4 / 1.863 / 0.202 / 0.108 / 46.975 / 0.532 / 0.011
Typha latifolia / grass (wetland) / Freshwater marsh / 4 / 1.845 / 0.590 / 0.320 / 41.900 / 0.909 / 0.022
Alnus rhombifolia / fixer tree / Mixed riparian forest / 4 / 1.658 / 0.316 / 0.191 / 48.600 / 1.417 / 0.029
Juglans californica / deciduous tree / Mixed riparian forest / 3 / 2.477 / 0.420 / 0.170 / 44.967 / 0.751 / 0.017
Populus balsamifera / deciduous tree / Mixed riparian forest / 1 / 2.050 / NA / NA / 48.500 / NA / NA
Grass - native bunch / grass / Native grassland / 4 / 0.725 / 0.044 / 0.060 / 42.725 / 2.061 / 0.048
Grass - serpentine / grass / Native grassland / 6 / 0.523 / 0.083 / 0.158 / 41.050 / 0.589 / 0.014
Grass - wetland (Juncus sp.) / grass (wetland) / Native grassland / 4 / 0.560 / 0.186 / 0.332 / 43.225 / 0.562 / 0.013
Carduus pycnocephalus / forb (thistle) / Non-native grassland / 4 / 0.738 / 0.095 / 0.129 / 43.325 / 0.263 / 0.006
Centaurea solstitialis / forb (thistle) / Non-native grassland / 4 / 0.720 / 0.083 / 0.115 / 43.175 / 0.450 / 0.010
Grass - European annual / grass / Non-native grassland / 5 / 0.594 / 0.254 / 0.427 / 42.480 / 1.699 / 0.040
Arbutus menziesii / evergreen tree / Oak woodlands and forest / 4 / 0.958 / 0.161 / 0.168 / 49.300 / 0.906 / 0.018
Quercus agrifolia / evergreen tree / Oak woodlands and forest / 5 / 1.362 / 0.208 / 0.152 / 47.980 / 0.531 / 0.011
Quercus douglasii / deciduous tree / Oak woodlands and forest / 4 / 1.900 / 0.167 / 0.088 / 45.875 / 0.359 / 0.008
Quercus lobata / deciduous tree / Oak woodlands and forest / 4 / 2.028 / 0.074 / 0.036 / 46.525 / 1.987 / 0.043
Umbellularia californica / evergreen tree / Oak woodlands and forest / 6 / 1.628 / 0.259 / 0.159 / 46.950 / 0.695 / 0.015
Salix exigua / deciduous tree / Salix forest / 4 / 2.148 / 0.303 / 0.141 / 47.000 / 0.833 / 0.018
Salix lasiolepis / deciduous tree / Salix forest / 4 / 2.020 / 0.082 / 0.041 / 51.467 / 0.666 / 0.013
Salix lucida / deciduous tree / Salix forest / 4 / 2.053 / 0.562 / 0.274 / 49.275 / 0.340 / 0.007
Heteromeles arbutifolia / evergreen shrub / Undifferentiated chaparral / 4 / 0.978 / 0.172 / 0.176 / 50.525 / 0.574 / 0.011
Prunus ilicifolia / evergreen shrub / Undifferentiated chaparral / 4 / 1.438 / 0.104 / 0.072 / 48.875 / 0.602 / 0.012
Quercus durata / evergreen tree / Undifferentiated chaparral / 5 / 1.202 / 0.223 / 0.185 / 46.640 / 0.541 / 0.012
Water Fraction (WL)
Species / Veg. Type / Veg. Type / Alliance community / Mean / s.d. / C.V.
Aesculus californica / deciduous tree / Aesculus californica woodland / 0.684 / 0.040 / 0.058
Adenostoma fasciculatum / evergreen shrub / Chaparral with A. fasciculatum / 0.469 / 0.030 / 0.063
Ceanothus cuneatus / fixer shrub / Chaparral with A. fasciculatum / 0.529 / 0.004 / 0.008
Ceanothus oliganthus / fixer shrub / Chaparral with A. fasciculatum / 0.509 / 0.020 / 0.040
Cercocarpus betuloides / fixer shrub / Chaparral with A. fasciculatum / 0.505 / 0.022 / 0.043
Artemisia californica / evergreen shrub / Coastal scrub / 0.578 / 0.031 / 0.054
Baccharis pilularis / evergreen shrub / Coastal scrub / 0.606 / 0.044 / 0.072
Rhamnus crocea / evergreen shrub / Coastal scrub / 0.523 / 0.010 / 0.019
Toxicodendron diversilobum / deciduous shrub / Coastal scrub / 0.637 / 0.086 / 0.135
Typha latifolia / grass (wetland) / Freshwater marsh / 0.822 / 0.045 / 0.055
Alnus rhombifolia / fixer tree / Mixed riparian forest / 0.507 / 0.028 / 0.055
Juglans californica / deciduous tree / Mixed riparian forest / 0.656 / 0.027 / 0.041
Populus balsamifera / deciduous tree / Mixed riparian forest / 0.607 / NA / NA
Grass - native bunch / grass / Native grassland / 0.453 / 0.085 / 0.188
Grass - serpentine / grass / Native grassland / 0.256 / 0.090 / 0.352
Grass - wetland (Juncus sp.) / grass (wetland) / Native grassland / 0.652 / 0.053 / 0.081
Carduus pycnocephalus / forb (thistle) / Non-native grassland / 0.625 / 0.052 / 0.083
Centaurea solstitialis / forb (thistle) / Non-native grassland / 0.634 / 0.080 / 0.126
Grass - European annual / grass / Non-native grassland / 0.411 / 0.090 / 0.219
Arbutus menziesii / evergreen tree / Oak woodlands and forest / 0.555 / 0.012 / 0.022
Quercus agrifolia / evergreen tree / Oak woodlands and forest / 0.454 / 0.035 / 0.077
Quercus douglasii / deciduous tree / Oak woodlands and forest / 0.493 / 0.015 / 0.030
Quercus lobata / deciduous tree / Oak woodlands and forest / 0.524 / 0.033 / 0.062
Umbellularia californica / evergreen tree / Oak woodlands and forest / 0.476 / 0.047 / 0.098
Salix exigua / deciduous tree / Salix forest / 0.587 / 0.012 / 0.021
Salix lasiolepis / deciduous tree / Salix forest / 0.541 / 0.018 / 0.033
Salix lucida / deciduous tree / Salix forest / 0.628 / 0.012 / 0.020
Heteromeles arbutifolia / evergreen shrub / Undifferentiated chaparral / 0.475 / 0.025 / 0.052
Prunus ilicifolia / evergreen shrub / Undifferentiated chaparral / 0.509 / 0.059 / 0.116
Quercus durata / evergreen tree / Undifferentiated chaparral / 0.562 / 0.027 / 0.047