Budding 



(1) A form of grafting, by inserting a bud with a small 

 amount of tissue at its base into a slit made in the stem of 

 the stock plant. (2) A form of asexual reproduction in which 

 a new cell grows out from the parent cell, e.g., yeast plants. 



Buffalo Wallow 



A depression in grassland made by buffalo or cattle while 

 trampling or wallowing, followed by denudation and loss of 

 soil. 



Buffering 



The modification of environmental conditions by vegeta- 

 tion or topographic features, e.g., shading, cf. Reaction. 



Buffer Species 



A plant or animal which may provide an alternative food 

 for another animal and thus reduce the demand for certain 

 food items. 



Buffer Strip 



A strip of grassland or other erosion-resistant vegetation 

 planted on the contour between or below cultivated strips 

 or fields. 



Buffer Zone 



(1) An area or strip surrounding a study-area or other 

 specific area in part or entirely to protect the inner area from 

 ecological disturbance by influences from the outside. (2) 

 A publicly owned range area adjoining a privately owned 

 range tract, which may be used to supplement the range 

 on the latter. 



Bulbil 



A small bulb or modified bulb by which the plant is 

 propagated. 



Bulk Density 



The mass or weight of oven-dry (100-1 10C.) soil per unit 

 of bulk volume, including air space. 



61 



