摘要
以三峡库区汝溪河流域马尾松纯林和马尾松青冈混交林为研究对象，对2种马尾松林分类型土壤有机碳与土壤呼吸强度进行了研究。结果表明：马尾松青冈混交林各土层（0～20cm、20～40cm、40～60cm）土壤总有机碳、微生物生物量碳（SMBC）、易氧化有机碳（ROOC）和水溶性有机碳（WSOC）含量均显著高于马尾松纯林；马尾松青冈混交林各土层土壤呼吸强度也分别比马尾松纯林显著高出18．4％、14．7％和17．3％，而马尾松青冈混交林1d土壤释放的CO2-C占土壤总有机碳的分配比例却总体上低于马尾松纯林；2种林分类型的土壤有机碳与土壤呼吸强度均存在显著的正相关性。与马尾松纯林相比，马尾松青冈混交林土壤具有更大的有机碳储量，表现出更强的土壤固碳能力。
Taking Pinus massoniana pure forest and P. massoniana-Quercus fabri mixed forest in Ruxi River Watershed in the Three Gorges Reservoir Area of central China as the research objects, we compared the soil organic carbon and soil respiration intensity of the two kinds of P. massoniana forests. The results showed that the content of total organic carbon, soil microbial biomass carbon （SMBC） , readily oxidized organic carbon （ROOC） and water soluble organic carbon （WSOC） in three soil layers （0 -20 cm,20 - 40 cm,40 -60 cm） under P. massoniana-Q, fabri mixed forest were all significantly higher than that of P. massoniana pure forest. The soil respiration rates in each soil layer of the mixed forest were respectively 18.4% , 14.7% and 17.3% higher than that of pure forest, while the allocation proportion of CO2-C released by soil respiration in total organic carbon per day under mixed forest was lower than that of pure forest on the whole. Moreover, there was a significant correlation between soil organic carbon and soil respiration rate in both forest stands. Accordingly, compared with P. massoniana pure forest, the soil of P. massoniana-Q, fabri mixed forest has higher organic carbon storage, and demonstrates stronger carbon sequestration capacity.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2014年第2期38-43,共6页
Journal of Beijing Forestry University
基金
林业公益性行业科研专项(201004039)
重庆市林业科学研究院基本科研业务专项(BS1107)
重庆市市级重点实验室建设项目(CSTC2007CA1001)
关键词
马尾松纯林
马尾松青冈混交林
土壤有机碳
土壤呼吸
Pinus massoniana pure forest
Pinus massoniana-Quercus fabri mixed forest
soil organic carbon
soil respiration
