华北落叶松人工林细根生物量及季节动态

Fine-root Biomass of Larix principis-rupprechtii and Seasonal Dynamics of Forests

通过对关帝山华北落叶松人工林（30年生）细根的生物量进行为期1年（2004-2005）研究，结果表明，华北落叶松人工林细根（≤5mm）生物量平均为305．26g／m^2。其中径级为2～5mm细根的平均生物量为149．37g／m^2，占根系总生物量16．11％；径级为1～2mm和≤1mm的平均生物量分别为39．26g／m^2和116．63g／m^2，分别占总根系生物量的比值为4．23％和12．58％。≤2mm死细根生物量为71．85g／m^2，占根系总生物量的7．75％；2～5mm死细根生物量为1．65g／m^2，所占比值极小。活细根（≤1mm，1～2mm）和死细根（≤2mm，2～5mm）生物量季节间差异显著（P〈0．05），2～5mm活细根生物量的季节间差异不显著（P〉0．05）。

30-year old Larix principis-rupprechtii forests was chosen to examine fine root biomass, seasonal dynamics in one year （2004-2005）. The mean annual fine root （Ф〈5mm） biomass was 305. 26 g/m^2. withФ=2-5mm , 1- 2mm and ≤1mm fine root biomass were respectively 149.37 g/m^2 , 39.26 g/m^2 and 116.63 g/m^2. The contribution to total root biomass was 16.11%, 4.23% and 12.58%. WithФ≤2mm necromass was 71.85 g/m^2 , the contribution to total root biomass was 7.75%;WithФ= 2-5 mm necromass was 1.65 g/m^2, the contribution to total root biomass was negelected. Siginificant seasonal changes were found in the fine root （≤1 mm, 1-2 mm） biomass and necromass （≤2 mm, 2-5 mm） （P〈0.05）, while 2-5 mm fine root biomass was detected significantly （P〉0.05）.