The Relation Between Root and Shoot Systems in Chaparral Shrubs1

2Botany Department, San Diego State University, San Diego, California 92182 Abstract: Purpose of this study was to determine the balance between root and shoot growth in chaparral shrubs. Under controlled conditions with ample water and nutrient supplies, growth of roots and shoots continued exponentially for 5 months. In contrast, in the field shoots had flushing periods in the spring, lasting 31-69 days. Fine root growth however extended over 5-7 months. Fine root surface area and leaf area per shrub were estimated for different environmental conditions. It was found that increasing water stress produced higher fine root surface:leaf area ratios.