Anderson L J, Comas L H, Lakso A N, Eissenstat D M
Department of Horticulture, Pennsylvania State University, University Park, PA 16802-4200, USA.
Current address: Department of Botany/Microbiology, Ohio Wesleyan University, Delaware OH 43015, USA.
New Phytol. 2003 Jun;158(3):489-501. doi: 10.1046/j.1469-8137.2003.00757.x.
• Minirhizotron techniques were used to examine root lifespan in Vitis labruscana (Concord grape) for roots born in four different years that varied in rainfall. • Experimental vines were given irrigation (irrigated or not) and canopy pruning treatments (minimal or balanced). Root survival was assessed from 1997 through 2000 and analysed using Cox proportional hazards regression. Model covariates included pruning, irrigation, vine yield, soil depth, root diameter, time of root birth, and numbers of neighboring roots. • Soil depth, root diameter and time of birth consistently influenced root lifespan in all years (P < 0.05). Deeper and coarser roots had longer lifespans. Roots born near bloom were shorter-lived than roots born later in the season. Pruning and irrigation influenced root lifespan in some years but their effects seemed to vary with growing-season environmental conditions. • These data underscore the value of long-term studies in distinguishing factors that consistently affect root lifespan from those that change annually with environmental conditions, and emphasize the diversity in life histories of fine roots within a species.
• 采用微根窗技术研究了不同年份出生、降雨量不同的美洲葡萄（康科德葡萄）根系的寿命。
• 对试验葡萄进行灌溉（灌溉或不灌溉）和树冠修剪处理（轻度或平衡修剪）。从1997年至2000年评估根系存活情况，并使用Cox比例风险回归进行分析。模型协变量包括修剪、灌溉、葡萄产量、土壤深度、根直径、根出生时间和相邻根的数量。
• 土壤深度、根直径和出生时间在所有年份均持续影响根系寿命（P < 0.05）。更深、更粗的根寿命更长。花期附近出生的根比季节后期出生的根寿命短。修剪和灌溉在某些年份影响根系寿命，但其影响似乎随生长季节环境条件而变化。
• 这些数据强调了长期研究在区分持续影响根系寿命的因素与随环境条件每年变化的因素方面的价值，并强调了一个物种内细根生活史的多样性。
