INDEX 



375 



Community structure, qualitative 



characters— Continued 

 vitality, 64 

 Compass plants, 137 

 Competition, 21-24, 188-190 



and dependent species, 25 



and soil moisture, 30 



causes of, 22 



direct (physical), 188 



intensity of, 22 



introduction of new species, 189- 

 190 



through physiological require- 

 ments, 188 



tree seedlings, 25 

 Conopholis americana, 27 

 Constance, 71-72 



diagram, 71, 72 

 Conservation, 337-347 



soil, 338-341 



water supply, 341-344 



wildlife, 345-347 

 Coptis trifolia, 241 

 Cormts canadensis, 241 



florida, 254 

 vernal aspect, 25 

 Cover, 61-62 



and temperature, 125-127 



by strata, 62 



classes, 62, 66 



estimation, 61-62 



in grassland studies, 62 



measurement, 61-62 



square foot density, 62 

 Coverage classes, 66 

 Cover-stratification diagrams, 66 

 Cowa?iia, 268 

 Crop ecology, 326-327 

 Cuscuta, 191 

 Cy penis, 175 

 Cypress swamp, 31, 176 

 Cyrilla racemiflora, 257 



D 



Dalea, 288 



Dasylirion longisshnum, 290 

 Death Valley, 287-288 

 Deciduous forest (beech-maple), 18 

 Deciduous forest formation, 245-259 

 beech-maple association, 18, 249- 



250 

 hemlock-hardwoods association, 



250-251 

 maple-basswood association, 249- 

 250 



mixed mesophytic association, 245, 

 247-249 



oak-chestnut association, 251-252 



oak-hickory association, 252-255 



range, climate, topography, 245- 

 256 

 Decomposition and available nitro- 

 gen, 197 

 Deer, 26, 201, 208-209 

 Dendrochronology, 308-310 



applications, 308 



correlations with climate, 309-310 



methods, 308, 309 



sunspot activity, 310 

 Density, 58, 59 



in phytographs, 63, 231 



applied in succession, 231-232 

 Dependence 



animals, 26 



community, 23 



Conopholis americana, 27 



epiphytes, 26 



kinds of organisms, 26 



Monotropa imiflora, 27 



parasites, 26 



saprohytes, 26 

 Desert formations, 283-289 



areas, 283 



Desert Scrub, 286, 287-289 



extent, climates, conditions, 283 



Sagebrush, 284, 285-286 

 Desert Scrub formation, 286, 287-289 



Chihuahua desert, 289 



Mojave desert, 287-288 



Sonoran desert, 288, 289 

 Dew point, 78 

 Dionaea muscipida, 257 

 Disclimax, 226 



Rromus tectorum, 227 



Opuntia, 227 

 Dispersion, 64 

 Disseminules, 199 



animal transported, 198-200 



transporting devices, 199-200 



wind transported, 108-109 

 Distichlis spicata, 185 

 Distribution of vegetation 



and temperature zones, 15, 324 



causes, 16, 324-325 



correlation with single factors, 15, 

 324 

 Dominance, 23 



aspect, 65 



criteria of, 25 



