钱文丽　　　　　　卢元　　　　王韶仲　谷加存

(东北林业大学，哈尔滨，150040)　　　(辽宁省林业调查规划院)　　　　　　(东北林业大学)



混交对红松人工林细根生物量和空间分布的影响1)

钱文丽卢元王韶仲谷加存

(东北林业大学，哈尔滨，150040)(辽宁省林业调查规划院)(东北林业大学)

以黑龙江省尚志市帽儿山实验林场的红松(Pinuskoraiensis)人工纯林、红松×胡桃楸(Juglansmandshurica)和红松×水曲柳(Fraxinusmandschurica)混交林为研究对象，采用土钻法估计并比较了不同混交处理下红松、伴生树种和其他木本植物细根(直径≤2.0 mm)生物量及其垂直分布特征。结果表明：细根总生物量(0～30 cm)以纯林最高(212.6 g·m-2)，红松×胡桃楸混交林最低(164.7 g·m-2)，而红松×水曲柳混交林居中(200.8 g·m-2)；纯林中红松细根生物量显著高于红松×胡桃楸混交林，但与红松×水曲柳混交林没有显著差异；混交没有引起林分细根总生物量垂直分布的改变，均为随着土壤深度增加而减少；混交后红松细根生物量在土壤表层(0～10 cm)分配的比例增加，但是吸收根(直径≤0.5 mm)生物量在土壤底层(20～30 cm)分配的比例在红松×胡桃楸混交林(64.5%)中比纯林高(40.1%)，而在红松×水曲柳混交林中所占比例较低(22.0%)。方差分析显示，混交树种、土壤深度和根直径等级均是影响红松细根生物量的重要因子。这些结果表明，混交对红松人工林细根生物量及其空间分布有明显影响，这为深入认识红松及其混交树种间的相互作用提供了必要的理论依据。

混交林；红松；水曲柳；胡桃楸；细根

We used soil core method to determine how species mixing betweenPinuskoraiensis,JuglansmandshuricaandFraxinusmandschuricaaffects the fine root (diameter ≤2.0 mm) biomass and spatial distribution inP.koraiensisplantation. Roots were categorized into three groups: root ofP.koraiensis, root of component tree species, and root of other woody plants. Total fine root biomass per unit area was the highest (212.6 g·m-2) in pureP.koraiensisplantation, the lowest (164.7 g·m-2) inP.koraiensis×J.mandshuricaplantation, and medium (200.8 g·m-2) inP.koraiensis×F.mandschuricaplantation. Root biomass ofP.koraiensiswas significantly higher in pure stand than that ofP.koraiensis×J.mandshuricaplantation, while was similar to that ofP.koraiensis×F.mandschuricaplantation. Species mixing did not change the vertical distribution of total fine root biomass, with a tendency of decline associated with soil depth increasing. The proportion of fine roots ofP.koraiensisat the surface layer (0 to 10 cm) was higher in mixed-species forest plantations than in pure plantation, however, the proportion of absorptive roots at the deepest soil layer (20-30 cm) was the highest (64.5%) inP.koraiensis×J.mandshuricaplantation, following by pure (40.1%) andP.koraiensis×F.mandschurica(22.0%) plantations. Factorial ANOVA indicated that species mixing, soil depth and root diameter classes all significantly contributed to the variation of root biomass. Therefore, the species mixing had significant effect on fine root biomass and vertical distribution ofP.koraiensis, and provide some insights into the belowground ecological interaction betweenP.koraiensisand its component species.

细根(直径≤2.0 mm)具有巨大的吸收表面积和较强的生理活性，是林木水分和养分吸收的主要器官[1]，并在森林生态系统的物质循环与能量流动上发挥了重要作用[2]。……