以四川省德阳市旌阳区低效柏木林改造8年后的3种模式(即:柏木+桤木+杂交竹模式(柏+竹+桤)、柏木+麻栎模式(柏+栎)、柏木+杂交竹模式(柏+竹))作为研究对象,柏木纯林作为对照,调查了柏木低效林不同改造模式的细根生物量。结果表明:不同改造模式与土层对细根生物量的影响非常显著(P<0.01),柏+竹与柏+竹+桤模式细根生物量显著高于纯柏模式,柏+栎模式细根生物量最小。在不同改造模式中,柏木细根生物量在土壤层次上的分布也存在显著差异,柏+竹与柏+竹+桤模式中柏木细根生物量随着土层的加深呈上升趋势,而柏+栎模式中则随着土层的加深呈下降趋势,柏+栎模式中柏木死细根的比重明显高于其他模式。几种模式中,柏+竹+桤模式细根生物量分布相对稳定,而柏+栎模式的稳定性较差。 The results showed that there are three patterns after eight years of inefficient cypress forest transformation in Jingyang District, Deyang City, Sichuan Province (ie: the cypress + alder + bamboo hybrid model (cypress + bamboo + cyprid), the cypress wood + Cedar + hybrid bamboo model (cypress + bamboo)) as a research object, cypress pure forest as a control to investigate the different transformation modes of Cork inefficient small root biomass. The results showed that the effects of different reformation patterns and soil layers on the fine root biomass were significant (P <0.01). The fine root biomass of cypress and bamboo + cypress + bamboo + cypresses was significantly higher than that of pure cypress, Root biomass is the smallest. In different transformation patterns, the distribution of fine root biomass of cypress also showed significant differences in the soil layers. The fine root biomass of cypress in cypress and bamboo + cypress + bamboo + cypresses increased with the deepening of soil layers, In the oak + oak pattern, the proportion of dead fine roots in cypress wood was significantly higher than that of the other patterns in the oak and oak patterns as the soil depth deepened. Among the several patterns, the fine root biomass distribution was relatively stable in the cypress + bamboo + cypresses and the stability of the cypress + oak pattern was poor.