川西亚高山冷杉和白桦细根生物量与碳储量特征  

Characteristics of Biomass and Carbon Stock of Fir and Birch Fine Roots in Subalpine Forest of Western Sichuan, China

作　　者：胡建利 杨万勤 张健 邓仁菊 

机构地区：[1]泗川农业大学林学园艺学院,雅安625014

出　　处：《应用与环境生物学报》2009年第3期313-317,共5页Chinese Journal of Applied and Environmental Biology

基　　金：国家自然科学基金项目(Nos. 30771702, 30471378);教育部新世纪优秀人才支持计划项目(No. NCET-07-0592);国家“十一五”重大科技支撑计划课题(No. 2006BAC01A11);四川省杰出青年学科带头人培养基金项目(No. 07JQ0081)~~

摘　　要：为了解川西亚高山地下生态过程和细根在森林碳(C)库中的作用,采用钻取土芯法,研究了川西亚高山岷江冷杉(Abies faxoniana)和白桦(Betula platyphylla)2006年一个生长季节内的细根生物量动态及其C储量特征.冷杉细根现存量显著大于白桦,二者分别为(6.579±0.220)t hm-2和(3.334±0.182)t hm-2.细根生物量具有明显的月变化规律,以10月最高,6月最低.同时,每次细根大量发生后,都随之产生大量细根死亡.细根生物量和C储量均随着土壤深度的增加而减少.冷杉83.24%的细根分布于土壤表层0～10cm范围内,11～20cm为16.76%;而白桦50.26%的细根分布在土壤表层0～10cm的范围内,0～20cm层为80.39%.活细根在各层中占总细根量的73%以上.冷杉和白桦细根C含量分别为47.21%±2.56%和42.71%±0.89%,对应的细根C储量分别为(3.106±0.104)t hm-2和(1.377±0.078)t hm-2.Monthly dynamics of biomass and carbon stock of Abies faxoniana and Betula platyphylla Sukaczev fine roots in the forests in western Sichuan were studied in order to understand the belowground process of subalpine forest ecosystem and the role of fine roots in forest carbon pool, employing the method of sampling soil core in a growth period of 2006. The fine root biomass ofA. faxoniana [（6.579±0.220） t hm^-2] was significantly higher than that ofB. platyphylla [（3.334±0.182） t hm^-2]. The highest and lowest values of fine root biomass were observed in October and June, respectively. Additionally, higher biomass of dead fine roots was observed after higher biomass of living fine roots was found. Both biomass and carbon stock of fine roots decreased with increasing of soil depth. 83.24% and 16.76% ofA. faxoniana fine roots distributed in 0-10 cm and 11-20 cm soil layers, respectively. Similarly, 50.26% and 80.39% of B. platyphylla fine roots occurred in 0-10 cm and 0-20 cm soil layers, respectively. Living fine roots accounted for 73% of the total fine roots in different soil layers. 47.21%±2.56% and 42.71%±0.89% carbon contents, and （3.106±0.104） t hm^-2 and （1.377±0.078） t hm^-2 carbon were measured, in A. faxoniana and B. platyphylla fine roots, respectively.

关 键 词：亚高山 细根 生物量 碳储量 冷杉 白桦 川西 

分 类 号：S718.55[农业科学—林学]