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OALib Journal期刊
ISSN: 2333-9721
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川西亚高山冷杉和白桦细根生物量与碳储量特征
DOI: 10.3724/SP.J.1145.2009.00313, PP. 313-317
Keywords: 亚高山,细根,生物量,碳储量,冷杉,白桦,川西
Abstract:
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(abiesfaxoniana)和白桦(betulaplatyphylla)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)thm-2和(3.334±0.182)thm-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)thm-2和(1.377±0.078)thm-2.图1表3参37
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