草地早熟禾根系生物量分布动态  

Distribution Trend of Kentucky bluegrass Root Biomass

作　　者：吴健[1] 苏德荣[1] 全艳嫦[1] 刘艺杉[1] 姚春燕[1] 徐大伟[1] 

机构地区：[1]北京林业大学森林培育教育部重点实验室,北京100083

出　　处：《安徽农业科学》2011年第19期11370-11373,共4页Journal of Anhui Agricultural Sciences

基　　金：国家科技支撑计划项目(2006BAD16B09)

摘　　要：[目的]研究秋季生长季中草地早熟禾根系生物量、根重密度、根长密度的分布动态。[方法]采用土钻法在生长季内对草地早熟禾草坪取样,研究根系生物量、根重密度、根长密度在时间、空间上的动态变化,以及生物量与土壤含水率的关系。[结果]在秋季生长季中,草地早熟禾根系生物量、根重密度、根长密度的变化规律相同,8月底达到峰值,分别为0.18g/cm2、5.75×10-3g/cm3和114.64cm/cm3。根系各指标的空间分布规律相同,随着土壤深度的增加,呈逐渐减少趋势。生物量与土壤含水率的变化趋势相同,说明草坪草在不同土壤水分条件下对根系分配不同的光合产物。[结论]该研究为认识根系周转规律,C、N在城市生态系统中循环、再分配的过程及根系不同时期的吸收策略提供理论基础。[Objective]The research aimed to study the distribution trends of Kentucky bluegrass root biomass,root weight density（RWD）,root length density（RLD） in autumn growing season.[Method]The soil sampling was used to sample on Kentucky bluegrass turf in the growing season.The time and space variation trends of root biomass,RWD and RLD,the relationship between the biomass and the soil water content were studied.[Result]In autumn growing season,the variation rules of Kentucky bluegrass root biomass,RWD and RLD were same.They reached the peak values in August and were respectively 0.18 g/cm2,5.75 ×10-3 g/cm3,114.64 cm/cm3.The space distribution rules of every index were same.As the soil depth increased,they showed the gradual decrease trend.The variation rule of biomass was same with that of soil water content.It illustrated that Kentucky bluegrass distributed the different photosynthetic products to the root under the different soil water content conditions.[Conclusion]The research provided the theory basis for understanding the turnover rule of root,the cycle and redistribution process of C,N in the urban ecological system,the absorption strategy of root in the different periods.

关 键 词：草地早熟禾 生物量 根重密度 根长密度 土壤含水率 

分 类 号：S132[农业科学—农业基础科学]