A preliminary study on fine root biomass and dynamics of woody plants in several major forest communities of Changbai Mountain,China
A preliminary study on fine root biomass and dynamics of woody plants in several major forest communities of Changbai Mountain,China
复制标题
作者：
Guo Zhong
2005年，采用钻孔/土芯法对长白山北方沿着5个森林群落（阔叶红松林、亚洲白色桦林、大卫白杨林、云杉-结果表明，不同海拔高度的植被带，细根生物量和季节动态存在差异，不同海拔高度的植被带，细根生物量和季节动态存在差异亚洲白色白桦林具有最高的月平均生物量（5.1340 t/hm 2），其次是云冷杉林（5.0530 t/hm~2），白桦林（4.9255 t/hm~2），阔叶红松林（4.4919 t/hm~2）和大卫白杨林（3.9372 t/hm 2），阔叶红松林月平均最高值与最低值相差72%，白桦林月平均最高值与最低值相差73%，结果表明，沿着的生长季节，大卫林、云冷杉林和白桦林的土壤含水量分别为26%、56%和144%。在所有森林群落中，细根生长一般在春季达到最高水平，并在初秋达到另一个高峰（9月）在某些群落中，细根的死亡通常伴随着新根的生长，死亡细根的总生物量在生长季结束时达到最大值。72.9%的细根分布在0~10 cm土层内，不同群落间差异较小，表层10 cm细根生物量由高到低依次为亚洲白色桦林、阔叶红松林、云冷杉林、艾曼斯白桦林和大卫白杨林。
Fine root distribution and biomass were examined in 2005 using auger/soil core method in five forest communities along the northern slope of Changbai Mountain.Selected forest communities are Broad-leaved Korean Pine forest,Asian white birch forest,David poplar forest,Spruce-fir forest and Ermans Birch forest and belong to different vegetation belts of different altitudes.The results show that fine root biomass and seasonal dynamics vary among different forest communities.Asian white birch forest has the highest monthly mean biomass(5.1340 t/hm~2),followed by Spruce-fir forest(5.0530 t/hm~2),Ermans Birch forest(4.9255 t/hm~2),Broad-leaved Korean Pine forest(4.4919 t/hm~2) and David poplar forest(3.9372 t/hm~2).The difference between highest and lowest monthly mean values is about 72% in Broad-leaved Korean Pine forest,73% in Asian white birch forest,26% in David poplar forest,56% in Spruce-fir forest,and 144% in Ermans Birch forest.Along growing season,fine root growth is generally at the highest level in spring in all forest communities and reaches another peak in the early fall(September) in some communities.Fine root mortality usually follows new root growth and total biomass of dead fine roots reaches its maximum level at the end of growth season.Over 72.9% of fine roots are distributed within 0～10 cm of soil surface,which varies slightly among different communities.The fine root biomass in top 10 cm of forest soil surface follows the sequence of Asian white birch forest,Broad-leaved Korean Pine forest, Spruce-fir forest,Ermans Birch forest and David poplar forest from high to low.